WTW SenTix 20 Plastic PH Electrode with Gel Electrolyte, S7 Connector, 103630
€128.00
% Manufacturer's RRP: €142.00 9% below manufacturer's RRP
- Plastic shaft, 120 mm long, 12 mm in diameter
- Gel electrolyte with fibre diaphragm
- Measuring range 0 to 14 pH, temperature range 0 to 80 °C
- S7 plug-in head, connection cable to be selected separately
- Without temperature sensor, membrane resistance less than 1 GΩ
- For waste water, aquarium and swimming pool water, groundwater and household cleaning products
Product information "WTW SenTix 20 Plastic PH Electrode with Gel Electrolyte, S7 Connector, 103630"
The WTW SenTix 20 is a plastic pH electrode with a gel electrolyte and an S7 connector. It is supplied without a cable. The length and plug of the connection cable can therefore be adapted to the existing measuring instrument.
Shaft, membrane and gel
The shaft is made of PPE/PS, is 120 mm long and has a diameter of 12 mm. The membrane is cylindrical; the diaphragm is made of fibre, and a gel serves as the reference system. The membrane resistance is less than 1 GΩ, the pH measurement range extends from 0 to 14 pH and the permissible temperature range is from 0 to 80 °C. The manufacturer specifies this range for outdoor use.
Select the cable as required
Depending on the measuring instrument, the S7 connector head accommodates one of three WTW connection cables: AS/DIN, 1 m (order no. 108110), AS/DIN-3, 3 m (108112) or AS/BNC, 1 m (108114). The electrode does not have its own temperature sensor.
Commissioning and storage
Before taking the first measurement, remove the wetting cap; shake the device to remove any air bubbles behind the membrane. During short measurement breaks, the measuring chain should be kept in reference electrolyte (3 mol/l KCl, Ag⁺-free); overnight, it should be stored in the wetting cap filled with this solution. Storing the electrode in a dry state or in deionised water can cause permanent damage; if the cap dries out, the manufacturer recommends at least 24 hours of conditioning. Strong acids and alkalis, hydrofluoric acid, organic solvents, oils, fats and proteins shorten the service life, as is the case with any pH measuring chain.
When another SenTix model is a better fit
For those wishing to measure temperature and pH with a single measuring chain, the SenTix 41-3 features an integrated NTC sensor on a 3 m fixed cable. For measurements up to 100 °C in a glass shaft, the SenTix 81 is the alternative. The SenTix 20 is suitable where gel, plastic and a freely selectable cable are sufficient.
Typical applications
- Electroplating effluent, industrial effluent and effluent in general
- Aquarium water and swimming pool water
- Groundwater, lake water, surface water and seawater
- Household cleaning products
Technical details
| Type | Plastic pH electrode with gel electrolyte |
| Sensor shape | Cylinder |
| Shaft material | Plastic (PPE/PS) |
| Shaft length / Shaft diameter | 120 mm / 12 mm |
| Diaphragm | Fibre |
| Reference system | Gel |
| pH measurement range | 0 to 14 pH |
| Temperature range | 0 to 80 °C |
| Membrane resistance | < 1 GΩ |
| Temperature sensor | None |
| Connection | S7 plug-in connector, without connection cable |
| Standards | EU Declaration of Conformity (RoHS Directive 2011/65/EU), WEEE marking |
Scope of delivery
- 1 WTW SenTix 20 pH measuring chain with rinsing cap
- Connection cable not included, available separately
Individual requirements and procurement service
Our procurement service is available to assist with the correct S7 connection cable, KCl-250 reference electrolyte (order no. 109705) for the rinsing cap, buffer solutions for calibration or any other SenTix model. The operating instructions for the measuring chain describe calibration and maintenance in detail. We would be happy to advise you in advance on which cable is suitable for your measuring instrument.