Electrochemistry & pH measurement
The Electrochemistry & pH Measurement range brings together electrodes and accessories for precise pH, redox and conductivity measurements. LT Laborhandel stocks WTW pH electrodes with glass or plastic shafts, redox and Ag electrodes, as well as DIN/NIST buffer solutions for calibration. You can find suitable measuring instruments in the Scales & Measurement category. Our service team will be happy to advise you on the right electrode.
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 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 21 plastic pH electrode (gel electrolyte, BNC connector), 103631
The WTW SenTix 21 is a robust and reliable standard pH electrode, specially designed for routine use in the laboratory, in training or for field measurements. As the ‘workhorse’ of the SenTix range, it combines durability with ease of use. Robust design for laboratory and field use The shaft of the SenTix 21 is made of robust plastic (polypropylene), not glass. This makes the electrode extremely resistant to mechanical damage and ideal for environments where glass breakage poses a risk, such as in teaching, outdoor measurements or in production. Low-maintenance thanks to gel electrolyte The main advantage of this electrode is its low maintenance. It uses a gel electrolyte instead of a liquid KCl solution. This means that the electrolyte never needs to be topped up, which saves time and eliminates potential sources of error during maintenance. The fibre diaphragm ensures a stable electrolyte flow and reliable measurements in standard aqueous samples. Connection and compatibility (BNC connector) This model (MPN 103631) is fitted with a 1-metre fixed cable and a BNC connector. The BNC connector is the universal standard for most pH meters from various manufacturers (with the exception of WTW meters, which often require a proprietary DIN connector). Important measurement note (No ATC) Please note that this model does not have an integrated temperature sensor (ATC). For automatic temperature compensation, a separate temperature probe (e.g. TFK 325) must be connected to the meter.
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 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 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: 50 ml (€32.00 / 100 ml)
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
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 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 SenTix H analogue special-purpose pH electrode, ground-glass diaphragm, S7 connector, 103644
The WTW SenTix H analogue special-purpose pH electrode is a sophisticated, premium-class electrochemical system solution designed specifically for high-precision measurements in the extremely high-alkalinity range and in sample media with very high salt concentrations. In traditional applications within the chemical industry, electroplating or the monitoring of industrial effluents, conventional standard electrodes often suffer from the so-called alkalinity error (sodium error) or blockages of the diaphragm. The SenTix H eliminates these sources of process error whilst minimising damage to the material, thanks to a highly specialised membrane glass formulation and mechanically optimised reference system kinetics. The system deliberately omits an integrated temperature sensor to ensure maximum robustness and thermal service life in demanding electrochemical applications. Specialised glass to counteract the alkali error and for high salt concentrations The material architecture of the sensor is uncompromisingly designed for extreme pH ranges. The sensitive membrane glass is characterised by excellent selectivity, which reliably minimises measurement errors caused by high concentrations of sodium ions in strongly alkaline environments. 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. This guarantees consistently high ionic activity and excellent reproducibility of measurement results, even during continuous use in aggressive chemical media. Controlled electrolyte outflow via an adjustable ground diaphragm An outstanding design feature of the SenTix H is the integrated ground diaphragm. Compared with conventional ceramic or fibre diaphragms, the precisely ground glass core enables a comparatively high, continuous and precisely defined electrolyte flow. These flow dynamics prevent sample components from entering the reference system and, without damaging the material, rule out blockages caused by crystallisation or salt precipitation. The ground diaphragm can be easily cleaned and reactivated as required, which drastically extends the sensor’s service life in multi-user operation and guarantees a fast, stable response. Extended geometry and flexible S7 plug-in head The physical boundary of the system is defined by a robust glass shaft, which, with a special length of 165 mm, allows deep immersion into necked flasks, reactors, deep sample vessels or laboratory apparatus. The mechanical and electrical connection to the pH meter is made via the standardised S7 connector. As no fixed cable is fitted, the electrode can be operated with a high degree of flexibility using various cable types (e.g. S7 to DIN or S7 to BNC). This protects the delicate glass probe from mechanical stress caused by cable tension and enables the sensor to be replaced easily within the existing measurement setup without the need to re-route the entire cable infrastructure. Technical details Measurement & Sensor Technology Sensor type: Special analogue pH electrode Model: SenTix H pH measurement range: 0 to 14 pH (optimised for the high-alkali range) Temperature element: Without integrated temperature sensor Operating temperature range: 0 to 100 degrees Celsius Construction & 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: S7 plug-in head (without fixed connection cable) Geometry: Cylindrical glass membrane Operating conditions Maintenance: Refillable (KCl liquid replaceable) Main applications: Strongly alkaline media, high salt concentrations, electroplating, process monitoring, deep laboratory vessels Scope of delivery 1 x WTW SenTix H analogue special-purpose pH electrode (MPN: 103644) 1 x humidification cap with KCl storage solution 1 x pipette vial with refill electrolyte (3 mol/l KCl) 1 x Quality certificate / Quick start guide Important note: A suitable S7 connection cable (e.g. AS/DIN or AS/BNC), calibration buffers and the pH meter itself are not included in the standard scope of delivery and must be ordered separately. Customised requirements & accessories To ensure the full performance capabilities of the WTW SenTix H in highly alkaline matrices, we stock a comprehensive range of connection components and consumables. For connection to the meter, we offer genuine WTW laboratory cables with an S7 connector head fitted to a DIN or BNC plug. For regular recalibration in the critical alkaline range, we recommend certified WTW technical buffer solutions (in particular pH 9.18 and pH 10.01) in handy dosing bottles. The use of genuine 3 mol/l KCl solution is essential for the regular refilling of the reference system and for the material-friendly storage of the ground diaphragm during measurement breaks. Please make use of our technical procurement service to tailor your industrial test setup to your specific requirements.
WTW Technical Buffer Solution TEP 10 Trace, 1 bottle containing 1 L: pH 10.01, #108703
WTW Technical Buffer Solution TEP 10 Trace, 1 bottle containing 1 L: pH 10.01, #108703
Content: 1000 ml (€4.60 / 100 ml)
WTW Technical Buffer Solution TEP 4, 1 bottle containing 1 L: pH 4.01, #108700
WTW Technical Buffer Solution TEP 4, 1 bottle containing 1 L: pH 4.01, #108700
Content: 1000 ml (€4.60 / 100 ml)
WTW plastic pH electrode with gel electrolyte, S7 connector, without connection cable, #103630
WTW plastic pH electrode with gel electrolyte, S7 connector, without connection cable, #103630
WTW epoxy pH electrode with liquid electrolyte, integrated temperature sensor, waterproof DIN plug and banana plugs, 1 m cable #103651
WTW epoxy pH electrode with liquid electrolyte, integrated temperature sensor, waterproof DIN plug and banana plugs, 1 m cable #103651
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 surface pH electrode, for measurement on smooth surfaces (paper, film, etc.) with an S7 connector. Without connection cable. #103646
WTW surface pH electrode, for measurement on smooth surfaces (paper, film, etc.) with an S7 connector. Without connection cable. #103646
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 epoxy pH electrode with liquid electrolyte, integrated temperature sensor, waterproof BNC connector and banana plug, 1 m cable #103652
WTW epoxy pH electrode with liquid electrolyte, integrated temperature sensor, waterproof BNC connector and banana plug, 1 m cable #103652
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 glass pH electrode with liquid electrolyte, S7 connector, length 120 mm. Without connection cable. #103639
WTW glass pH electrode with liquid electrolyte, S7 connector, length 120 mm. Without connection cable. #103639
WTW Standard (DIN/NIST) buffer solution, 1 bottle containing 250 ml: pH 9.180 / 9.18, #109130
WTW Standard (DIN/NIST) buffer solution, 1 bottle containing 250 ml: pH 9.180 / 9.18, #109130
Content: 250 ml (€11.60 / 100 ml)
WTW plastic pH electrode with gel electrolyte, integrated temperature sensor, waterproof DIN plug and banana plugs, 3 m cable, #103636
WTW plastic pH electrode with gel electrolyte, integrated temperature sensor, waterproof DIN plug and banana plugs, 3 m cable, #103636
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 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