Electrodes
Electrodes are key components for precise pH, redox and conductivity measurements in laboratories, research and industry. LT Laborhandel stocks WTW electrodes with glass or plastic shafts, digital IDS electrodes and Ag electrodes for argentometry. You will also find suitable pH buffer solutions for calibration in our shop; for more information on electrochemistry, see the ‘Electrochemistry & pH Measurement’ category. If you are unsure which electrode is suitable, please do not hesitate to contact us.
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 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 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 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 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 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
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 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.