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 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 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 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 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 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 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 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 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 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 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 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
WTW SenTix ORP-T 900 digital IDS redox electrode, glass shaft, 1.5 m fixed cable, 103791
The WTW SenTix ORP-T 900 digital IDS redox electrode is a highly advanced electrochemical system solution for the precise determination of the oxidation-reduction potential (ORP) and temperature in laboratories, research institutes and industrial process control. Designed for use with modern WTW IDS multi-parameter analysers, this digital platinum electrode enables error-free signal transmission and comprehensive documentation in accordance with strict quality standards. In demanding electrochemical analyses, corrosion studies or the monitoring of detoxification and neutralisation processes, the elimination of signal interference caused by long cable runs is the primary criterion for guaranteeing high-precision measurements whilst minimising damage to the material. Intelligent IDS sensor technology and digital signal processing The mechatronic system architecture of the SenTix ORP-T 900 is based on innovative IDS (Intelligent Digital Sensors) technology. Unlike conventional analogue redox probes, the sensitive analogue voltage signal is digitised and calibrated directly within the internal sensor assembly. This transient signal processing completely eliminates electromagnetic interference, such as that which may be induced by surrounding laboratory equipment, motors or stirring drives. An integrated data memory permanently stores the sensor’s specific serial number and calibration history. This guarantees maximum process reliability and seamless GLP compliance for every measurement. High-purity platinum sensor technology and refillable reference system The material design is consistently optimised for maximum precision and chemical resilience. The electrode features a chemically highly resistant glass shaft that remains stable even in aggressive media. The actual sensor element consists of a high-purity platinum tip, which ensures excellent electron transfer and fast response times. A tried-and-tested liquid electrolyte containing 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. In combination with the precise ceramic diaphragm, a constant electrolyte flow is ensured, which drastically reduces the risk of diaphragm blockages and significantly extends the sensor’s service life in multi-user operation. Integrated temperature compensation and process-reliable fixed cable connection To ensure thermodynamically correct measurement results, the SenTix ORP-T 900 features a built-in 30 kOhm NTC temperature sensor, which is integrated directly into the electrode tip and enables precise real-time correlation of the measured redox potential with the sample temperature. The connection to the IDS measuring instrument 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 at the plant. Technical details Measurement & Sensor Technology Sensor type: Digital IDS redox electrode (ORP) Model: SenTix ORP-T 900 Redox measurement range: -1250 to +1250 mV Sensor element: High-purity platinum (platinum cup) Temperature element: Integrated 30 kOhm NTC temperature sensor Operating temperature range: 0 to 100 °C Construction & dimensions Shaft material: Chemically highly resistant glass shaft Electrolyte: Liquid electrolyte (3 mol/l KCl, refillable) Diaphragm: Ceramic 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: Refillable (KCl liquid replaceable) Main applications: Chemical analysis, electroplating baths, environmental measurement technology, wastewater monitoring, research Contents 1 x WTW SenTix ORP-T 900 digital IDS redox electrode with 1.5 m fixed cable (MPN: 103791) 1 x storage 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: Redox test solutions, cleaning concentrates and the IDS measuring instrument 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 ORP-T 900, we recommend using it with a compatible WTW MultiLine or inoLab IDS meter. To enable regular checking and verification of the metrological chain, we stock certified WTW redox test solutions (e.g. 180 mV, 430 mV or 475 mV). For regular refilling and the proper storage of the platinum tip, we recommend original 3 mol/l KCl solution. Please make use of our technical procurement service to put together your digital measuring station.
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 pH micro-electrode, for use in small volumes and small vessels, with S7 connector, shaft diameter 5 mm. Without connection cable. #103647
WTW pH micro-electrode, for measurement in small volumes and small vessels, with S7 connector, shaft diameter 5 mm. Without connection cable. #103647
WTW SenTix Micro 900 digital IDS pH microelectrode, Ø 5 mm, 1.5 m fixed cable, 103751
The WTW SenTix Micro 900 digital IDS pH microelectrode is a specialised, electrochemical system solution for high-precision pH measurement in minimal sample volumes and confined vessel geometries. Designed for demanding applications in biomedical, pharmaceutical and chemical research laboratories, this digital probe enables reliable, process-safe operation directly in NMR tubes, Eppendorf cups or delicate culture vessels. When analysing valuable or rare sample media, reducing the minimum required volume whilst simultaneously eliminating signal interference is the primary criterion for ensuring reproducible measurement results whilst minimising damage to the sample material. The system is fully validated for WTW IDS multi-parameter analysers and supports modern GLP and GMP documentation processes. Intelligent IDS sensor technology and digital measurement stability The mechatronic system architecture of the SenTix Micro 900 is based on innovative IDS (Intelligent Digital Sensors) technology. The highly sensitive analogue voltage signal from the measuring chain is digitised and calibrated directly within the internal sensor assembly. This transient signal processing completely eliminates sources of electromagnetic interference, such as those that may be induced by surrounding laboratory equipment or stirrer drives. An internal data memory permanently stores the electrode’s specific serial number as well as a complete history of the last 10 calibrations. Via the integrated QSC function (Quality Sensor Control), the sensor continuously assesses its current condition and displays this directly on the screen of the connected measuring instrument, which significantly enhances the validity of each individual test step. Delicate glass shaft and refillable liquid delivery system The materials-science-based design is consistently optimised for requirements in the microlitre range. With an extremely slender shaft diameter of just 5 mm, the electrode allows deep, non-contact immersion into the narrowest of sample vessels. 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. In combination with a precise platinum wire diaphragm, a defined, constant electrolyte flow is achieved. This guarantees a rapid response from the pH-sensitive glass membrane and prevents diffusion potentials and measurement drifts, even in media with low ion content or those that are slightly viscous. Integrated temperature sensor and process-reliable fixed cable connection To ensure thermodynamically correct analyses, the SenTix Micro 900 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. 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 or moisture in confined laboratory workstations, prevents accidental cable disconnections during the measurement series and ensures uninterrupted signal transmission. Technical details Measurement & Sensor Technology Sensor type: Digital IDS pH microelectrode Model: SenTix Micro 900 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 diameter: 5 mm (optimised for very small volumes) Shaft length: 120 mm Electrolyte: Liquid electrolyte (3 mol/l KCl, refillable) Diaphragm: Platinum wire diaphragm Connection type: Fixed cable, length 1.5 m with digital IDS plug Serial number: Stored electronically within the sensor Operating conditions Minimum immersion depth: Low (suitable for use in the microlitre and millilitre range) Application: NMR tubes, Eppendorf cups, small sample vessels, biotechnology, microanalysis Contents 1 x WTW SenTix Micro 900 digital IDS pH microelectrode with 1.5 m fixed cable (MPN: 103751) 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: 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 make full use of the WTW SenTix Micro 900’s full range of functions, 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 stock certified WTW technical buffer solutions (pH 4.01, pH 7.00 and pH 10.01). For regular refilling and the proper storage of the sensitive glass diaphragm, we recommend the original 3 mol/l KCl solution. As protein and sample residues can build up on the platinum diaphragm over time, we also stock special cleaning solutions to restore the sensor’s performance. Please use our technical procurement service to put together your digital micro-measurement station.
WTW glass pH electrode, liquid electrolyte, integrated temperature sensor, BNC connector and banana plugs, length 120 mm, 1 m cable, #103643
WTW glass pH electrode, liquid electrolyte, integrated temperature sensor, BNC connector and banana plugs, length 120 mm, 1 m cable, #103643
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 pH microelectrode, 3 mm diameter, liquid electrolyte (3 mol/l KCl) and platinum diaphragm, 1 m cable with DIN plug #103660
WTW pH microelectrode, 3 mm diameter, liquid electrolyte (3 mol/l KCl) and platinum diaphragm, 1 m cable with DIN plug #103660