WTW digital IDS redox electrode SenTix ORP-T 900, 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 meters, this digital platinum electrode enables reliable signal transmission and documentation according to 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 obtaining 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 reduces 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 supports process reliability and documentation in a GLP environment for every measurement.

High-purity platinum sensor technology and refillable reference system

The material design is optimised for precision and chemical resistance. 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 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 supports reliable 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: -1,250 to +1,250 mV
• Sensor element: High-purity platinum (platinum tip)
• 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

Scope of delivery

• 1 x WTW SenTix ORP-T 900 digital IDS redox electrode with 1.5 m fixed cable (MPN: 103791)
• 1 x wetting cap with KCl storage solution
• 1 x pipette vial with refill electrolyte (3 mol/l KCl)
• 1 x operating manual

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 check and safeguard the metrological chain regularly, we offer 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.