WTW SenTix 945 digital IDS pH electrode, glass shaft, 1.5 m fixed cable, 103743

The WTW SenTix 945 digital IDS pH electrode is a highly advanced, electrochemical system solution for precise and low-maintenance pH measurement in both laboratory and field applications. Designed for direct use with WTW IDS multi-parameter analysers, this digital electrode with a glass shaft ensures error-free signal transmission and comprehensive documentation. When carrying out demanding measurement series in aqueous samples, environmental analyses or industrial quality control, the risk of signal interference over long cable runs is the primary factor in ensuring high-precision measurements whilst minimising damage to the equipment. Thanks to its permanently attached cable, this version offers maximum watertightness and reliability in daily routine operation.

Intelligent IDS sensor technology and digital signal processing

The mechatronic system architecture of the SenTix 945 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 sensor. 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 triple-diaphragm architecture

The material design combines the classic chemical inertness of a high-quality glass shaft with state-of-the-art diaphragm kinetics. An outstanding design feature of the SenTix 945 is its three integrated ceramic diaphragms. This triple arrangement ensures optimal and rapid electrolyte contact with the sample medium, even in difficult, low-ion or slightly viscous solutions, and drastically minimises the risk of measurement drifts. A proven gel electrolyte serves as the reference system, eliminating the need to top up with liquid KCl electrolyte and reducing maintenance requirements in day-to-day laboratory work to a minimum.

Integrated temperature compensation and fixed cable connection

To ensure precise measurement results, the SenTix 945 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 attached, 1.5-metre-long cable fitted with a waterproof, digital IDS connector. This fixed cable connection offers optimum mechanical protection against the ingress of splash water and moisture. It guarantees uninterrupted signal transmission as well as convenient and rapid handling directly at the laboratory workstation or during field measurements, without the need to manage additional connectors on the sensor.

Technical details

Measurement & Sensor Technology

• Sensor type: Digital IDS pH electrode
• Model: SenTix 945
• 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 the last 10 calibrations
• Sensor rating: QSC-compatible (Quality Sensor Control)

Design & dimensions

• Shaft material: High-quality glass shaft (highly chemically resistant)
• Electrolyte: Low-maintenance gel electrolyte
• Diaphragm: 3 ceramic diaphragms
• Shaft length: 120 mm
• Shaft diameter: 12 mm
• Connection type: Fixed cable, length 1.5 m with waterproof, 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, difficult samples, laboratory and field measurements

Contents

• 1 x WTW SenTix 945 digital IDS pH electrode with 1.5 m fixed cable (MPN: 103743)
• 1 x Storage 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 945, 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, pH 10.01) in our range. For the proper storage and protection of the glass membrane when the meter is not in use, we recommend the original KCl storage solution. Please use our technical procurement service to put together your digital measuring station.