WTW
WTW Technical Buffer Solution pH 7, Calibration Standard Series, (50 ml – 1000 ml)
WTW Technical Buffer Solution pH 7 (108802, 108702, 108708), defined as a high-precision electrochemical calibration standard, provides the metrological foundation for the validation of pH measurement chains in pharmaceutical analysis, biotechnology research and industrial quality assurance. In chemical metrology, a pH value of 7.00 represents the electrical zero point (isopotential point) of most commercially available pH electrodes. From a physico-chemical perspective, the effectiveness of this buffer solution is based on a precisely balanced phosphate buffer system consisting of dihydrogen phosphate (H₂PO₄⁻) and hydrogen phosphate (HPO₄²⁻). This system utilises chemical equilibrium to neutralise external acidic or basic influences, thereby maintaining the hydrogen ion activity at a constant level over a wide range. For procurement professionals in the pharmaceutical industry and research, the reliability of this zero point is an essential prerequisite for investment security, as it forms the basis for the linear calculation of the slope across the entire measurement range. Thermodynamics of ion activity and temperature coefficients The thermodynamics of the WTW Technical Buffer Solution pH 7 are characterised by a strictly defined temperature dependence of the dissociation constant. As the pH value is physically defined as the negative decimal logarithm of the H+ activity, changes in temperature affect the chemical equilibrium via the kinetic energy of the system. The TEP 7, TPL 7 and STP 7 variants feature a detailed temperature table, printed on the label, covering the range from 0 °C to 95 °C. This metrological precision is of fundamental importance for modern pH metres with automatic temperature compensation (ATC) in order to calculate the Nernst factor physically correctly and minimise measurement uncertainty. In industrial process analysis, where measurements are often taken far from the standard temperature of 25 °C, this documented temperature coefficient guarantees the full traceability of results to national primary standards. Variant-specific kinetics and application profiles (STP, TPL, TEP) The range of container sizes – 50 ml (STP 7), 250 ml (TPL 7) and 1000 ml (TEP 7) – allows for specific adaptation to the respective laboratory kinetics and sample throughput. The STP 7 variant (108708), supplied in a 50 ml bottle, is ideally designed for mobile field use or for laboratories with low throughput, in order to minimise the time the opened container is left open and thus the risk of carbonation due to atmospheric CO₂. The standard 250-ml TPL 7 (108802) is the universal workhorse for daily routine calibration in university education and research. For high-throughput environments in pharmaceutical production, the 1-litre variant TEP 7 (108702) offers a highly efficient solution for supplying automated calibration stations. Each variant is subject to the same stringent electrochemical specifications, enabling easy scaling of laboratory processes without compromising analytical integrity. Material science of the barrier layer and storage stability A critical quality attribute of the WTW Technical Buffer Solution pH 7 is the chemical composition of the storage containers. The bottles are made of high-density polyethylene (HDPE), which provides an excellent diffusion barrier against atmospheric gases. The ingress of carbon dioxide would physically shift the pH value into the acidic range via the formation of carbonic acid (H₂CO₃), which would lead to significant calibration errors, particularly in the neutral pH range. The stabilised matrix of the WTW buffer solutions also prevents microbiological growth without altering the surface tension of the electrode’s glass membrane. For pharmaceutical buyers, this long-term stability is a key factor in reducing TCO (Total Cost of Ownership), as the solutions exhibit a metrological drift of less than 0.01 pH units over their entire service life, provided that the handling instructions are followed. Electrochemical metrology and compliance in quality assurance Finally, the use of the WTW Technical Buffer Solution pH 7 ensures compliance with the highest regulatory standards, such as GMP, GLP and ISO 17025. When calibrating a measuring chain, the buffer solution is used to determine the asymmetry voltage. The use of technical buffers in accordance with DIN 19267 ensures a high degree of comparability of measured values between different laboratory sites. The solution’s optimised ionic strength reduces the electrode’s response time, which enhances efficiency, particularly in diagnostics and time-critical process controls. By choosing the WTW buffer series, laboratories are investing in a tried-and-tested system solution that harmonises physical excellence with the practical requirements of modern quality management. Technical Details Thermodynamics & Chemical Specifications Nominal pH value (at 25 °C): 7.00 Measurement uncertainty: ± 0.03 pH Buffer system: Phosphate buffer (based on KH₂PO₄ / Na₂HPO₄) Temperature range: 0 °C to 95 °C (with documented table of values) Kinetics: Rapid potential stabilisation through optimised ionic conductivity Metrology & Control Engineering Conformity: Complies with the requirements for technical buffers in accordance with DIN 19267 Traceability: Directly traceable to NIST / PTB primary standards Calibration function: Determination of zero point and asymmetry voltage Stability: Microbiologically stabilised, CO₂-inhibited Materials Science & Variants – Dimensions Container material: High-density polyethylene (HDPE) with barrier properties Variant STP 7 (108708): 50 ml bottle (ideal for field use) Variant TPL 7 (108802): 250 ml bottle (standard size for routine use) Variant TEP 7 (108702): 1000 ml bottle (for high-volume use/automation) Environmental conditions & storage Storage temperature: 15 °C to 25 °C (recommended) Shelf life: Typically 24 months from date of manufacture (depending on batch) Physical state: Liquid, odourless, pH-neutral Contents 1 x WTW Technical Buffer Solution pH 7 (in the selected variant: 50 ml, 250 ml or 1000 ml) 1 x temperature correction table (printed on the label) Important note: Buffer solutions are consumables. To ensure metrological integrity, solution that has been removed must never be returned to the original container. The use of a separate beaker for calibration is physically essential. Individual requirements & accessories For a complete two-point calibration, in addition to the WTW Technical Buffer Solution pH 7, a second standard (e.g. pH 4.01 TPL 4 or pH 10.01 TPL 10) is required to determine the slope of the electrode. For the maintenance of your pH sensors, we also recommend WTW cleaning solutions (e.g. RL 1 for protein removal) and a 3-molar KCl solution for the proper storage of the reference systems. All supplementary standards and maintenance kits are available via our procurement service.
Content: 250 ml (€6.84 / 100 ml)
WTW SenTix 41 analogue pH electrode, integrated temperature sensor, 103635
The WTW SenTix 41 analogue pH electrode is a tried-and-tested electrochemical system solution for reliable, low-maintenance pH measurement in routine laboratory applications, educational institutions and field measurements. Designed for use with classic analogue pH meters from the WTW inoLab and Profiline series, this high-quality electrode offers precise signal transmission and extremely simple handling. For daily monitoring measurements in aqueous media, wastewater samples or environmental investigations, the focus is on straightforward, rapid deployment – which this robust combination probe guarantees whilst being gentle on materials and ensuring process reliability. Traditional analogue technology and integrated temperature compensation The mechatronic system architecture of the SenTix 41 is based on reliable, analogue signal transmission. The measured potential is transmitted via a shielded fixed cable directly to the analogue input stage of the pH meter. A key functional feature is the NTC 30 kOhm temperature sensor integrated into the sensor head. This sensor measures the sample temperature simultaneously with the pH value, enabling the connected meter to perform automatic temperature compensation in real time. This reliably eliminates thermodynamically induced measurement errors caused by fluctuating ambient temperatures, without the need to immerse a separate temperature sensor in the sample. Low-maintenance gel electrolyte and mechanical breakage protection The material design is consistently optimised for durability and minimal maintenance in everyday laboratory use. The electrode is fitted with a chemically resistant and extremely break-resistant POM plastic shaft. This shaft encloses the sensitive glass membrane like a mechanical protective cage and prevents damage in the event of falls or contact with vessel walls. A maintenance-free gel electrolyte, combined with a tried-and-tested fibre diaphragm, serves as the reference system. This sealed system permanently eliminates the need for the tedious refilling of liquid KCl solution and significantly reduces the risk of diaphragm blockages in multi-user operations. Universal connectivity and ergonomic laboratory use To ensure seamless integration into equipment, the SenTix 41 features a permanently attached 1-metre cable terminated in tried-and-tested standard connectors. The pH channel is connected via a standard DIN plug, whilst the integrated temperature sensor is connected via a 4 mm banana plug. This standardised plug combination guarantees universal compatibility with a wide range of analogue measuring stations on the market. The flexible cable ensures optimal ergonomic movement and allows fatigue-free working when carrying out sequential measurements on larger sample series directly at the workstation. Technical details Measurement & Sensor Technology Sensor type: Analogue pH combination electrode Model: SenTix 41 pH measurement range: 0 to 14 pH Temperature element: Integrated NTC 30 kOhm temperature sensor Operating temperature range: 0 to 80 °C Design & dimensions Shaft material: Highly robust plastic shaft (POM) with integrated protective cage Electrolyte: Low-maintenance gel electrolyte (non-refillable) Diaphragm: Reliable fibre diaphragm Shaft length: 120 mm Shaft diameter: 12 mm Connection type: Fixed cable, length 1.0 m Connector type: DIN plug (for pH) and 4 mm banana plug (for temperature) Operating conditions Maintenance: Low maintenance (no refilling of liquids required) Main applications: Routine laboratory measurements, schools and training, field measurements, general aqueous media Contents 1 x WTW SenTix 41 analogue pH electrode with 1 m fixed cable (MPN: 103635) 1 x storage cap with original storage solution 1 x Quick start guide / Quality certificate Important note: pH buffer solutions for regular calibration and the analogue pH meter itself are not included as standard and must be ordered separately. Individual requirements & accessories To ensure consistently high measurement accuracy of the WTW SenTix 41, regular recalibration of the measuring station is essential. For this purpose, our range includes certified WTW technical buffer solutions in practical dosing bottles (pH 4.01, pH 7.00 and pH 10.01). For the proper care and storage of the pH-sensitive glass membrane during measurement breaks, we strongly recommend the use of the original 3 mol/l KCl storage solution. Should the electrode ever become contaminated with stubborn sample residues during the rigours of everyday laboratory work, we offer special cleaning concentrates for gentle regeneration. Please make use of our procurement service when putting together your laboratory equipment.
WTW Standard (DIN/NIST) buffer solution, 1 bottle containing 250 ml: pH 4.006 / 4.01, #109110
WTW Standard (DIN/NIST) buffer solution, 1 bottle containing 250 ml: pH 4.006 / 4.01, #109110
Content: 250 ml (€11.60 / 100 ml)
WTW ProfiLine pH 3110 Handheld Meter (pH/mV, DIN connector), 2AA110
The WTW ProfiLine pH 3110 is a robust and reliable entry-level handheld meter for all users who need to measure pH values quickly and easily in the field, in the laboratory or on the production floor. It is designed to focus on the essential functions of pH measurement and offers maximum durability. Extremely robust and waterproof (IP 67) The housing is fully waterproof and dustproof to IP 67. (Feature) For professional buyers working in the field (environmental measurement technology, water analysis, aquaculture) or in harsh production environments, this means maximum reliability. (Benefit) The meter can withstand rain, dirt and even a fall into water. Simple and Reliable Operation Unlike complex devices with data loggers, the pH 3110 is optimised purely for measurement. (Feature) It features a clear, high-contrast LCD display and an intuitive keypad. The 3-point automatic calibration (using WTW TEC or DIN buffers) is easy to carry out and ensures reliable results. (Benefit) It is the perfect instrument for routine applications where the measurement value is required immediately but no digital documentation is needed. Flexible electrode connection (DIN) This meter is deliberately fitted with a standard DIN connector (for pH/mV) and 4 mm banana sockets (for separate temperature probes). (Feature) This allows procurement specialists the flexibility to continue using existing standard analogue electrodes from various manufacturers (Benefit). Technical details Measurement channels: 1 (pH/mV) pH range: -2,000 to +20,000 pH mV range: ±1,200.0 mV; ±2,500 mV Temperature range: -5.0 to +105.0 °C Connection (pH): DIN (for pH electrode) Connection (temperature): 2 × 4 mm banana sockets (for TFK probe or similar) Data storage: No (calibration report only) Interface: No Protection rating: IP 67 (waterproof) Display: LCD (7-segment, backlit) Calibration (pH): 1-, 2-, 3-point (WTW TEC / DIN buffers) Power supply: 4 x 1.5 V AA (batteries) Contents of the pack ProfiLine pH 3110 meter (main unit) 4 x AA batteries Quick start guide Important note: The carrying case, pH electrodes and temperature probe (TFK) are accessories and are not included with the basic unit (2AA110). Customised requirements & procurement service Do you need advice on the right pH electrode for your application (e.g. a robust SenTix 41 with a DIN connector) or a separate temperature probe (TFK 325)? Our team of experts will be happy to put together a complete set for you. For accessories not listed here, please use our bespoke procurement service.
WTW Technical Buffer Solution TLP 10 Trace, 1 bottle of 250 ml: pH 10.01, #108805
WTW Technical Buffer Solution TLP 10 Trace, 1 bottle of 250 ml: pH 10.01, #108805
Content: 250 ml (€6.80 / 100 ml)
WTW SenTix 61 glass pH electrode, refillable, DIN connector, 103640
Precision thanks to liquid electrolyte The WTW SenTix ® 61 is a high-quality standard pH electrode with a glass shaft, designed for demanding measurement tasks in the laboratory. Unlike gel-filled electrodes, this model utilises a liquid reference electrolyte (3 mol/l KCl, free from silver ions). This ensures a faster electrolyte flow and more stable potential formation, particularly with difficult samples. As the electrolyte is refillable, the user benefits from a significantly longer service life for the electrode compared with maintenance-free models. High-quality platinum diaphragm The built-in platinum wire diaphragm ensures a reliable connection between the sample and the reference system. It is characterised by a constant flow rate and is less prone to blockages than conventional ceramic diaphragms. The robust glass shaft is highly chemically resistant, easy to clean and ideally suited for use across a wide temperature range from 0 to 100 °C. Compatibility and connection The SenTix ® 61 (variant 103640) is fitted with a permanently attached 1-metre cable and a waterproof DIN plug. This connection standard ensures reliable signal transmission and is perfectly compatible with numerous WTW pH metres (e.g. the inoLab ® series) as well as other measuring instruments with a DIN socket. Please note that this model does not have an integrated temperature sensor; temperature measurement must be carried out separately if required. Technical details pH measurement range: 0 – 14 Temperature range: 0 – 100 °C Reference electrolyte: KCl 3 mol/l (liquid, refillable) Diaphragm: platinum Shaft material: Glass Shaft length / diameter: 120 mm / 12 mm Temperature sensor: No (NTC not integrated) Connection: DIN plug (waterproof) Cable length: 1 m (fixed) Diaphragm shape: Cylinder Diaphragm resistance (at 25°C): < 600 MOhm Contents of delivery WTW SenTix ® 61 pH electrode Fixed cable (1 m) with DIN plug Operating instructions Note: An initial supply of electrolyte is included; refill bottles must be ordered separately. Customised requirements & procurement service Do you need the correct electrolyte solution (KCl 3 mol/l), storage solution or a model with an integrated temperature sensor (e.g. SenTix 81)? We can advise you on optimal electrode maintenance. Please contact our procurement service for accessories and spare parts.
WTW Standard (DIN/NIST) buffer solution, 1 bottle containing 250 ml: pH 6.865 / 6.87, #109120
WTW Standard (DIN/NIST) buffer solution, 1 bottle containing 250 ml: pH 6.865 / 6.87, #109120
Content: 250 ml (€11.60 / 100 ml)
WTW Technical Buffer Solution TPL 4, 1 bottle of 250 ml: pH 4.01, #108800
WTW Technical Buffer Solution TPL 4, 1 bottle of 250 ml: pH 4.01, #108800
Content: 250 ml (€6.80 / 100 ml)
WTW SenTix 81 analogue precision pH electrode, glass shaft, 103642
The WTW SenTix 81 analogue precision pH electrode represents a premium-class metrological system solution for high-precision and reliable pH measurement in demanding laboratory applications. Designed for use with classic analogue pH meters from the WTW inoLab and Profiline series, this high-quality glass electrode offers excellent signal transmission and the highest measurement accuracy. For complex tasks in chemical research, pharmaceutical quality control or university-level analysis, rapid and stable potential stabilisation is the primary criterion for ensuring reproducible measurement results in a process-reliable manner that minimises damage to the sample. Traditional analogue technology and integrated temperature compensation The mechatronic system architecture of the SenTix 81 is based on reliable, analogue signal transmission. The measured potential is transmitted via a high-quality, shielded fixed cable directly to the analogue input stage of the pH meter. A key functional feature is the 30 kOhm NTC temperature sensor integrated into the sensor head. This sensor measures the sample temperature simultaneously with the pH value, enabling the connected meter to perform automatic temperature compensation in real time. This reliably eliminates thermodynamically induced measurement errors caused by fluctuating ambient temperatures, without the need to immerse a separate temperature sensor in the sample. High-quality platinum diaphragm and refillable reference system The materials-science-based design is uncompromisingly optimised for maximum precision and fast response times. The electrode features a chemically highly resistant glass shaft and a cylindrical glass diaphragm. A tried-and-tested liquid electrolyte (3 mol/l KCl) serves as the reference system; this can be easily topped up or completely replaced via a sealable opening at the top of the glass shaft. A standout technological feature is the integrated platinum diaphragm. This specialised diaphragm ensures a continuous and uniform flow of electrolyte without the risk of blockages, even with challenging sample media such as emulsions, suspensions or slightly viscous solutions. Universal connectivity and ergonomic laboratory use To ensure seamless integration into laboratory set-ups, the SenTix 81 features a permanently attached, 1-metre-long cable terminated in tried-and-tested standard connectors. The pH channel is connected via a standard DIN plug, whilst the integrated temperature sensor is connected via a 4 mm banana plug. This standardised plug combination guarantees universal compatibility with a wide range of analogue measuring stations on the market. The flexible cable ensures optimal ergonomic movement and allows fatigue-free working when sequentially measuring larger sample series directly at the workstation. Technical Details Measurement & Sensor Technology Sensor type: Analogue pH combination electrode Model: SenTix 81 pH measurement range: 0 to 14 pH Temperature element: Integrated NTC 30 kOhm temperature sensor Operating temperature range: 0 to 100 °C Construction & dimensions Shaft material: Highly chemically resistant glass shaft Electrolyte: Liquid electrolyte (3 mol/l KCl, refillable) Diaphragm: High-quality platinum diaphragm Shaft length: 120 mm Shaft diameter: 12 mm Connection type: Fixed cable, length 1.0 m Connector combination: Waterproof DIN plug (for pH) and 4 mm banana plug (for temperature) Operating conditions Maintenance: Refillable (KCl solution replaceable) Main applications: Demanding laboratory measurements, chemical analysis, challenging sample media, general aqueous media Contents 1 x WTW SenTix 81 analogue pH glass electrode with 1 m fixed cable (MPN: 103642) 1 x storage cap with original storage solution 1 x pipette bottle with refill electrolyte (3 mol/l KCl) 1 x Quick start guide / Quality certificate Important note: pH buffer solutions for regular calibration and the analogue pH meter itself are not included as standard and must be ordered separately. Individual requirements & accessories To ensure consistently high measurement accuracy of the WTW SenTix 81, regular recalibration of the measuring station is essential. For this purpose, our range includes certified WTW technical buffer solutions in practical dosing bottles (pH 4.01, pH 7.00 and pH 10.01). For the proper care and storage of the pH-sensitive glass membrane during measurement breaks, we strongly recommend the use of the original 3 mol/l KCl storage solution. Should the electrode ever become contaminated with stubborn sample residues during the rigours of everyday laboratory work, we offer special cleaning concentrates for gentle regeneration. Please make use of our technical procurement service when putting together your laboratory equipment.
WTW SenTix Top 41 pH electrode (PEEK shaft, polymer), 103816
WTW SenTix Top 41: The PEEK all-round electrode for field and laboratory use The WTW SenTix Top 41 (Item No. 103816) is a highly robust, low-maintenance pH electrode designed as an all-rounder for almost any application – from field measurements to demanding laboratory and industrial applications. Extremely robust thanks to its PEEK shaft The shaft is made of PEEK (polyetheretherketone), an extremely durable plastic. This makes the electrode ideal for use outside the laboratory, in training or in harsh production environments where there is a risk of glass breakage. Low-maintenance and clog-resistant Thanks to the solid polymer electrolyte, there is no need to top up with liquid electrolyte – the electrode is low-maintenance. The perforated diaphragm is also resistant to contamination and blockages, which extends its service life in difficult samples (e.g. suspensions). Precise measurement (ATC) An integrated temperature sensor (NTC 30 kOhm) provides automatic temperature compensation (ATC), ensuring precise, temperature-independent pH readings. The electrode is connected to your meter via a separate S7 cable (not included). Do you need advice on the SenTix Top 41 or the appropriate S7 connection cable (e.g. AS/DIN)? Please contact our team of experts.
WTW SenTix 940 digital IDS pH electrode, plastic shaft, 1.5 m fixed cable, 103740
The WTW SenTix 940 digital IDS pH electrode represents a highly advanced, electrochemical system solution for precise and low-maintenance pH measurement in both laboratory and field applications. Designed for use with WTW IDS multi-parameter analysers, this digital electrode enables error-free signal transmission and comprehensive documentation. When carrying out demanding measurement series in aqueous samples, environmental analyses or industrial quality control, the elimination of signal interference caused by long cable runs is the primary criterion for guaranteeing highly precise measurements whilst minimising damage to the sample. Intelligent IDS sensor technology and digital signal processing The mechatronic system architecture of the SenTix 940 is based on innovative IDS (Intelligent Digital Sensors) technology. Unlike conventional analogue probes, the sensitive analogue voltage signal is digitised and calibrated directly within the internal sensor assembly. This transient signal processing completely eliminates electromagnetic interference. An integrated data memory permanently stores the sensor’s specific serial number as well as a calibration history for up to 10 calibrations. Thanks to the intelligent QSC (Quality Sensor Control) function, the sensor continuously assesses its current status and displays this directly on the measuring instrument, guaranteeing maximum process reliability with every measurement. Low-maintenance gel electrolyte and robust materials engineering The material design is consistently optimised for mechanical resilience and minimal maintenance intervals. The electrode features a shatterproof plastic shaft made of POM, which provides optimum protection for the sensitive glass diaphragm against mechanical impact during field measurements. A tried-and-tested gel electrolyte, combined with a fibre diaphragm, serves as the reference system. This low-maintenance system eliminates the need to top up liquid KCl electrolyte and drastically reduces the risk of diaphragm blockages, which significantly extends the sensor’s service life in multi-user operation. Integrated temperature compensation and process-reliable fixed cable To ensure precise measurement results, the SenTix 940 features a built-in 30 kOhm NTC temperature sensor, which provides automatic, real-time temperature compensation of the pH value. The connection to the IDS meter is via a permanently fitted, 1.5-metre-long cable with a waterproof, digital IDS connector. This fixed cable connection offers optimum mechanical protection against the ingress of splash water and moisture and guarantees uninterrupted signal transmission as well as convenient handling at the laboratory workstation or directly in mobile field applications. Technical details Measurement & Sensor Technology Sensor type: Digital IDS pH electrode Model: SenTix 940 pH measurement range: 0 to 14 pH Temperature element: Integrated NTC 30 kOhm temperature sensor Operating temperature range: 0 to 80 °C Calibration memory: Integrated memory for up to 10 calibrations Sensor evaluation: QSC-compatible (Quality Sensor Control) Design & dimensions Shaft material: Robust plastic shaft (POM) Electrolyte: Low-maintenance gel electrolyte Diaphragm: Fibre diaphragm Shaft length: 120 mm Shaft diameter: 12 mm Connection type: Fixed cable, length 1.5 m with digital IDS plug Serial number: Stored electronically within the sensor Operating conditions Maintenance: Low maintenance (no need to top up liquid electrolyte) Application: General-purpose aqueous media, laboratory and field measurements, quality control Contents 1 x WTW SenTix 940 digital IDS pH electrode with 1.5 m fixed cable (MPN: 103740) 1 x Watering cap with storage solution 1 x Quality certificate / Quick start guide Important note: pH buffer solutions, cleaning concentrates and the IDS meter itself are not included in the standard scope of delivery and must be ordered separately. Individual requirements & accessories To realise the full potential of the WTW SenTix 940, we recommend using it with a compatible WTW MultiLine or inoLab IDS meter. For regular recalibration and to ensure the integrity of the metrological chain, we offer certified WTW technical buffer solutions (pH 4.01, pH 7.00, pH 10.01) in our range. For the proper storage and care of the sensitive glass membrane, we recommend the original KCl storage solution. Please use our technical procurement service to put together your digital measuring station.
WTW redox electrode (platinum-silver/silver chloride), with plug-in connector, length 120 mm #103648
WTW redox electrode (platinum-silver/silver chloride), with plug-in connector, length 120 mm #103648
WTW inoLab ® pH 7110 Set 4 Laboratory pH Meter (with SenTix 81), 1AA114
The WTW inoLab ® pH 7110 Set 4 (MPN 1AA114) is the ‘precision package’ of the 7110 series, designed for laboratories that do not wish to compromise on measurement quality, even when dealing with challenging samples. Whilst the main unit offers the tried-and-tested, simple operation without complex menus, the key advantage of this set lies in the sensor technology: instead of a standard gel electrode, it includes the SenTix ® 81. This high-quality glass electrode with liquid electrolyte (KCl 3 mol/l) delivers more stable and faster readings than maintenance-free alternatives, even in protein-rich media, suspensions or during rapid temperature changes. Measurement performance and AutoRead The inoLab ® pH 7110 (with DIN connector) focuses on the essentials: precise measurement readings. The integrated ‘AutoRead’ function automatically monitors electrode drift and only locks the reading once the signal is stable. This eliminates subjective reading uncertainties. Together with the SenTix ® 81, whose platinum diaphragm ensures a constant electrolyte flow, you can thus achieve extremely high reproducibility. Operation and Calibration Despite being a high-end electrode, it remains intuitive to use. A large LCD segment display clearly shows all relevant information. Calibration is carried out using 1 to 3 points with automatic buffer recognition (WTW TEC or DIN/NIST). An adjustable calibration timer reliably reminds you to carry out regular maintenance to ensure the system’s high accuracy is maintained over the long term. The device features a smooth, easy-to-clean membrane keypad. Technical details pH measurement range: -2.000 … +19.999 pH Accuracy (pH): ±0.005 pH mV measurement range: ±1200.0 / ±2000 mV Accuracy (mV): ±0.3 mV Temperature measurement range: -5.0 … +105.0 °C Calibration: 1-, 2- or 3-point (WTW / DIN/NIST) pH connection: DIN socket (19262) Temperature connection: 2 × 4 mm banana sockets Sensor included in the set: SenTix ® 81 (glass, liquid-filled, platinum diaphragm, NTC 30 kOhm) Display: LCD segment display (black and white) Power supply: Universal mains adaptor or 4 x 1.5 V AA batteries Protection rating: IP 43 Contents inoLab ® pH 7110 meter (DIN) SenTix ® 81 pH electrode (liquid-filled, refillable, with integrated temperature sensor) Universal mains adaptor Stand (multi-purpose stand) pH 4 buffer solution (50 ml) Buffer solution pH 7 (50 ml) Buffer solution pH 10.01 (50 ml) Electrolyte solution 3 mol/l KCl (for electrode & storage) Measuring jug User manual Customised requirements & procurement service Do you work in food analysis (meat, cheese, yoghurt)? We can alternatively configure this kit with special insertion electrodes (e.g. SenTix SP) or supply you with the appropriate cleaning solutions (pepsin/HCl) to keep the platinum diaphragm of the SenTix 81 free from protein deposits.
WTW plastic pH electrode with gel electrolyte, integrated temperature sensor, BNC connector and banana plug, 1 m cable, #103637
WTW plastic pH electrode with gel electrolyte, integrated temperature sensor, BNC connector and banana plug, 1 m cable, #103637
WTW ProfiLine pH 3310 Set: 2 pocket pH metres (logger & USB), 2AA312
The WTW ProfiLine pH 3310 Set 2 is a professional, portable pH measurement system designed for precise field measurements and comprehensive data documentation in accordance with GLP/AQS standards. Unlike the basic 3110 model, the 3310 features an integrated data logger capable of storing up to 5,000 entries and a waterproof mini-USB interface. This enables the automated recording of measurement series (e.g. long-term monitoring of water bodies) and rapid transfer to a PC without the need for proprietary adapters. Measurement technology and process reliability The device offers 5-point calibration and the tried-and-tested CMC (Continuous Measurement Control) function. This displays on the backlit graphic display whether the current measured value is still within the calibrated range and issues a warning in the event of deviations. This increases the reliability of the measured values, particularly with changing sample matrices. Electrode and Robustness ‘Set 2’ includes the low-maintenance SenTix ® 41 pH electrode. It features a robust plastic shaft, an integrated temperature sensor (NTC 30 kOhm) for automatic temperature compensation, and a gel electrolyte that eliminates the need for refilling. The meter itself is waterproof to IP 67 (including the USB socket!) and can withstand brief submersion, making it the ideal companion in harsh environments or sewage treatment works. Technical details pH measurement range: -2.000 … +19.999 pH Accuracy (pH): ±0.005 pH mV measurement range: ±1200.0 / ±2500 mV Temperature measurement range: -5.0 … +105.0 °C Calibration: 1- to 5-point (22 buffer sets stored) Data memory: 5,000 entries (automatic) / 200 (manual) Interface: Mini-USB-B (waterproof) Protection class: IP 67 Power supply: 4 x 1.5 V AA (up to 100 hours of continuous operation) or via USB Contents of the pack ProfiLine pH 3310 meter SenTix ® 41 pH electrode (gel, integrated temperature sensor) STP 4 buffer solution (50 ml) STP 7 buffer solution (50 ml) Measuring beaker Tripod Professional carrying case USB cable (A to Mini-B) CD-ROM with driver software Batteries (4x AA) Quick start guide Customised requirements & procurement service Do you require more precise glass electrodes (e.g. SenTix 81) for laboratory applications, or an explosion-proof version for hazardous areas? We would be happy to put together kits specifically tailored to drinking water analysis or industrial requirements.
WTW glass pH electrode with liquid electrolyte, BNC connector, length 120 mm, 1 m cable, #103641
WTW glass pH electrode with liquid electrolyte, BNC connector, length 120 mm, 1 m cable, #103641
WTW Combined Ag electrode with liquid electrolyte for argentometry (2 mol/l KNO₃ + 0.001 mol/l KCl), S7 plug-in head #103664
WTW Combined Ag electrode with liquid electrolyte for argentometry (2 mol/l KNO₃ + 0.001 mol/l KCl), S7 plug-in head #103664
WTW SenTix ® HW-T 900 Digital IDS pH electrode (1.5 m fixed cable), 103753
The WTW SenTix ® HW-T 900 (MPN 103753) is the digital reference electrode for problematic samples in laboratory analysis. Equipped with intelligent IDS technology, this sensor features an adjustable ground joint. This design solves one of the most common problems in pH measurement: clogged diaphragms in protein-rich, suspended or low-ion media. Simply lifting the movable ground joint increases the electrolyte flow, ensuring contact with the sample even in difficult matrices (e.g. emulsions, cosmetics or boiler feedwater) and easily flushing out contaminants. Signal quality and QSC intelligence Unlike analogue electrodes, the SenTix ® HW-T 900 converts the sensitive measurement signal directly into digital data within the sensor head. This data is transmitted interference-free via the permanently integrated 1.5-metre cable to the IDS analyser (e.g. MultiLine ® or inoLab ®). Thanks to the QSC (Quality Sensor Control) function, the electrode stores its calibration history and serial number internally. In day-to-day laboratory work, this means you can use the electrode on different instruments without having to recalibrate it each time – the calibration data ‘travels’ with the sensor. Design and Maintenance At 165 mm, the glass shaft is slightly longer than that of standard electrodes, which makes it easier to use in taller vessels. A liquid electrolyte (KCl 3 mol/l) serves as the reference system and can be topped up via the side opening. This significantly extends the electrode’s service life compared with gel systems, as the electrolyte supply is not ‘exhausted’ but is replenished. An integrated 30 kOhm NTC sensor simultaneously provides the exact sample temperature for automatic compensation. Technical details pH measurement range: 0.000 … 14.000 Temperature measurement range: 0.0 … 60.0 °C Accuracy (pH): ± 0.004 Diaphragm: Adjustable annular gap (ground joint) Membrane glass resistance: < 600 MOhm Shaft material: Glass Shaft length: 165 mm Shaft diameter: 12 mm Electrolyte: Liquid, KCl 3 mol/l (refillable, silver-ion-free) Temperature sensor: Integrated (NTC 30 kOhm) Connection: 1.5 m fixed cable with waterproof digital connector (IDS) Signal type: Digital (IDS) Contents SenTix ® HW-T 900 electrode (incl. 1.5 m fixed cable) Operating instructions Customised requirements & procurement service Do you actually need this electrode in the plug-in head version (“-P”) for use with wireless modules? Or are you looking for the analogue version (SenTix HW) for older pH metres with a DIN/BNC input? We can source any WTW special-purpose electrode and the appropriate cleaning solutions (e.g. pepsin/HCl) for you.
WTW SenTix HW-T 900-P digital IDS pH special electrode, ground-glass diaphragm, 103767
The WTW SenTix HW-T 900-P digital IDS pH special-purpose electrode represents a premium-class electrochemical system solution for high-precision pH measurement in particularly demanding, low-ion or highly viscous media. Designed for use in environmental analysis, the chemical industry and in research and development laboratories, this digital glass electrode excels wherever conventional sensors fail due to insufficient electrolyte contact. When measuring in distilled water, boiler feedwater, organic solvents, emulsions or suspensions, the controlled flow dynamics of the reference system are the primary factor in reliably guaranteeing stable potentials and reproducible results. Intelligent IDS sensor technology and digital measurement reliability The mechatronic system architecture of the SenTix HW-T 900-P is based on pioneering IDS (Intelligent Digital Sensors) technology. The highly sensitive analogue voltage signal from the measuring chain is digitised and calibrated directly within the sensor head. This transient signal processing completely eliminates electromagnetic interference, such as that which may be induced by surrounding laboratory equipment, motors or stirring drives. The integrated data memory permanently stores the electrode’s specific serial number as well as a complete history of the last 10 calibrations. The automatic sensor evaluation system QSC (Quality Sensor Control) continuously monitors the electrode’s current condition and displays it on the IDS measuring instrument, guaranteeing the highest level of validity at every test stage. Adjustable ground diaphragm and refillable liquid reference system The materials-science-based design is specifically optimised for problematic sample matrices. The electrode features a precise, adjustable ground diaphragm. This ensures a comparatively high and constant flow rate of the liquid electrolyte, thereby achieving excellent electrical contact with the sample medium. Clogging caused by particles, oils or organic precipitates is prevented by the geometry of the ground core in a way that is gentle on the material. A tried-and-tested liquid electrolyte (3 mol/l KCl) serves as the reference system; it can be easily topped up or completely replaced via a sealable opening on the upper glass shaft. This guarantees an extremely fast response time and prevents measurement drifts even in media with low ion content. Extended glass shaft and universal IDS plug-in head To ensure thermodynamically correct analyses, the SenTix HW-T 900-P features a built-in 30 kOhm NTC temperature sensor, which is integrated directly into the sensor tip and performs automatic, real-time temperature compensation of the pH value. A key design feature is the extended glass shaft, measuring 165 mm in length, which allows deep immersion into specialised sample vessels, necked flasks or reactors. An outstanding ergonomic feature of this variant is the universal IDS plug-in head. The sensor does not have a permanently attached cable; instead, it can be connected to the measuring station with great flexibility, either via an AS IDS connection cable or completely wirelessly via a WTW radio module. This protects the delicate glass system from mechanical stress caused by cable tension and significantly improves the user’s freedom of movement. Technical details Measurement & Sensor Technology Sensor type: Digital IDS special-purpose pH electrode Model: SenTix HW-T 900-P pH measurement range: 0 to 14 pH Temperature element: Integrated NTC 30 kOhm temperature sensor Operating temperature range: 0 to 100 °C Calibration memory: Integrated memory for up to 10 calibrations Sensor evaluation: QSC-compatible (Quality Sensor Control) Design & dimensions Shaft material: Highly chemically resistant glass shaft Shaft length: 165 mm (extended version) Shaft diameter: 12 mm Electrolyte: Liquid electrolyte (3 mol/l KCl, refillable) Diaphragm: Adjustable ground diaphragm Connection head: Universal IDS plug-in head (for AS IDS cable or wireless module) Serial number: Stored electronically in the sensor Operating conditions Maintenance: Refillable (KCl liquid replaceable) Main applications: Low-ion media (e.g. pure water, distilled water), emulsions, suspensions, organic solutions, deep sample vessels Scope of delivery 1 x WTW SenTix HW-T 900-P digital IDS pH special electrode (MPN: 103767) 1 x rinsing cap with KCl storage solution 1 x vial of refill electrolyte (3 mol/l KCl) 1 x Quality certificate / Quick start guide Important note: The required IDS connection cable (e.g. AS IDS-1.5), wireless modules, pH buffer solutions and the IDS meter itself are not included in the standard scope of delivery and must be ordered separately. Individual requirements & accessories To make full use of the WTW SenTix HW-T 900-P’s full range of functions, we recommend operating it with a compatible WTW MultiLine or inoLab IDS meter. For the mechanical connection, we stock the suitable AS IDS-1.5 cable as well as innovative IDS wireless module systems for cable-free operation. For regular recalibration and to ensure the integrity of the metrological chain, we offer certified WTW technical buffer solutions (pH 4.01, pH 7.00 and pH 10.01). For regular topping up and the proper storage of the grinding system, we recommend the original 3 mol/l KCl solution. Please use our procurement service to put together your bespoke digital measuring station.
WTW pH electrode with 30 kOhm NTC and ground-glass diaphragm, liquid electrolyte (3 mol/l KCl), 1 m fixed cable with DIN plug and 4 mm banana plugs #103731
WTW pH electrode with 30 kOhm NTC and ground-glass diaphragm, liquid electrolyte (3 mol/l KCl), 1 m fixed cable with DIN plug and 4 mm banana plugs #103731
WTW plastic pH electrode with gel electrolyte and BNC connector, without temperature sensor, 1 m cable, #103633
WTW plastic pH electrode with gel electrolyte and BNC connector, without temperature sensor, 1 m cable, #103633
WTW inoLab ® pH 7110 BNC Laboratory pH Meter (base unit), 1AA120
The WTW inoLab ® pH 7110 BNC (MPN 1AA120) is the minimalist solution for routine laboratories seeking the highest measurement accuracy without unnecessary complexity. This model focuses purely on the measurement task: it offers the same high-quality measurement electronics as its larger counterparts in the 7310 series (accuracy of up to ±0.005 pH), but does without elaborate documentation functions or data storage. The key technical difference with this model is the BNC connector. Unlike the DIN plug normally used by WTW, the BNC socket offers maximum compatibility. It allows existing specialised electrodes from other manufacturers to continue to be used, or the use of sensors with standard BNC plugs, without the need for expensive adapter cables. AutoRead and operating concept Operation is kept to the essentials: a large, segmented LCD display shows all values at a glance, whilst the smooth, easy-to-clean keypad minimises input errors. The “AutoRead” function ensures process reliability: it monitors the drift of the electrode and only releases the measured value once it has stabilised. This eliminates subjective reading errors and guarantees reproducible results, even when used by less experienced staff. Calibration and Timer Although designed as an entry-level instrument, the 7110 supports 1- to 3-point calibration with automatic buffer recognition (WTW TEC or DIN/NIST). A built-in calibration timer periodically reminds the user of the need for recalibration to maintain measurement quality over the long term. Temperature compensation is carried out separately via two 4 mm banana sockets, allowing the connection of external temperature sensors. Technical details pH measurement range: -2.000 … +19.999 pH Accuracy (pH): ±0.005 pH mV measurement range: ±1200.0 / ±2000 mV Accuracy (mV): ±0.3 mV Temperature measurement range: -5.0 … +105.0 °C Calibration: 1-, 2- or 3-point (WTW / DIN/NIST) pH connection: BNC socket Temperature connection: 2 × 4 mm banana sockets Display: LCD segment display (black and white) Power supply: Universal mains adaptor or 4 × 1.5 V AA batteries Protection rating: IP 43 Contents inoLab ® pH 7110 BNC meter Universal mains adaptor Tripod User manual Note: This offer (1AA120) does not include a pH electrode. This must be ordered separately or taken from existing stock. Customised requirements & procurement service Do you need suitable BNC electrodes for specific applications (e.g. puncture measurements) or adapter cables for PT1000 temperature sensors? We can help you connect your existing sensor system to the inoLab 7110 or put together a pack of buffer solutions for you.
WTW TFK 325 temperature probe for automatic temperature compensation in aqueous solutions, with a 1 m cable and a waterproof connector, #102280
WTW TFK 325 temperature probe for automatic temperature compensation in aqueous solutions, with a 1 m cable and a waterproof connector, #102280
WTW TFK 150 temperature probe for automatic temperature compensation in corrosive media, with 1 m cable and waterproof connector, #102274
WTW TFK 150 temperature probe for automatic temperature compensation in corrosive media, with 1 m cable and waterproof connector, #102274