WTW SenTix Sp pH insertion electrode with stepped shaft and perforated diaphragm, S7 plug-in head, 103645
€343.00
% Manufacturer's RRP: €381.00 9% below manufacturer's RRP
- Spear-shaped tip for insertion measurements in semi-solid media
- Stepped plastic shaft, 65/25 mm long, 15/5 mm in diameter
- Referid polymer filling (lifetime) with perforated diaphragm
- Measuring range 2 to 13 pH, temperature range 0 to 80 °C
- Membrane resistance below 400 MΩ
- S7 plug-in head, connection cable selectable separately
Product information "WTW SenTix Sp pH insertion electrode with stepped shaft and perforated diaphragm, S7 plug-in head, 103645"
The WTW SenTix Sp is an insertion electrode for semi-solid samples such as cheese, meat or yoghurt: its tip is spear-shaped and is inserted directly into the sample.
Spear tip, stepped shaft and perforated diaphragm
The shaft features a stepped design, with lengths of 65 and 25 mm and diameters of 15 and 5 mm. The material is PPE/PS. A perforated opening serves as the diaphragm; the reference system is Referid, a lifetime polymer filling that does not require refilling. The membrane resistance is less than 400 MΩ.
Measuring range and temperature
The pH measuring range is from 2 to 13, and the permissible temperature range is from 0 to 80 °C. No temperature sensor is fitted. The sample temperature must therefore be measured separately.
S7 plug-in head and cable selection
The SenTix Sp is supplied without a cable. Depending on the measuring instrument, the AS/DIN connection cable with 1 m (order no. 108110) or 3 m (108112) or the AS/BNC cable with 1 m (108114) is suitable. The manufacturer offers a version with a fixed cable and temperature sensor as the SenTix Sp-T.
Differences from the RJD and Sur
The SenTix RJD has a dome-shaped membrane, a glass shaft and a built-in temperature sensor, and is designed for contaminated laboratory samples, emulsions and creams. The SenTix Sur measures on damp surfaces using a flat membrane. Like the Sp, both use the Referid filling. The spear-shaped design of the Sp is intended for insertion into semi-solid media.
Handling after use
Gas bubbles behind the membrane are removed by shaking before measurement. Between measurements, the measuring cell is kept in reference electrolyte (3 mol/l KCl, Ag⁺-free) and, overnight, in the filled wetting cap. Greasy residues are removed using water containing washing-up liquid; the measuring cell is then conditioned for at least one hour and recalibrated. Strong acids and alkalis, oils, fats and proteins shorten the service life of the measuring cell.
Typical applications
- Bread, fish, butter and margarine, meat and sausages, fruit and vegetables, cheese
- Yoghurt, quark and mayonnaise
- Hair gel, make-up, lotions, creams and toothpaste
- Insertion measurement in semi-solid media
Technical details
| Type | pH insertion electrode |
| Sensor shape | Spear |
| Shaft material | Plastic (PPE/PS) |
| Shaft length | 65 mm / 25 mm (stepped geometry) |
| Shaft diameter | 15 mm / 5 mm (stepped geometry) |
| Diaphragm | Hole |
| Reference system | Referid (lifetime polymer filling) |
| pH measuring range | 2 to 13 pH |
| Temperature range | 0 to 80 °C |
| Membrane resistance | < 400 MΩ |
| 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 Sp pH measuring cell with wetting cap
- Connection cable not included, available separately
Individual requirements and procurement service
Connection cables for the S7 connector head, KCl-250 reference electrolyte (order no. 109705) for the wetting cap and buffer solutions for calibration are available on request. Our procurement service can answer any questions regarding the sample and the appropriate electrode type.