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.