WTW SenTix Top 41 PEEK PH Electrode with Temperature Sensor, Low-maintenance, 1 m Cable, 103816

The WTW SenTix Top 41 has a PEEK shaft, a polymer electrolyte and a perforated diaphragm. The temperature range is from -5 to 100 °C; an NTC sensor with a resistance of 30 kOhm is housed within the shaft.

PEEK shaft and polymer electrolyte

The shaft is 120 mm long and has a diameter of 12 mm; the measurement range is from 0 to 14 pH. The diaphragm is perforated, the electrolyte is a polymer, and the electrode is considered low-maintenance. It is designed for outdoor and process measurements.

Cable with waterproof DIN connector

The Top 41 has a 1 m fixed cable with a waterproof DIN plug (coaxial plug to DIN 19262) and a 4 mm banana plug. A separate S7 cable is not required. If your measuring instrument has a BNC input, the SenTix 42 with BNC and banana plugs is a more suitable option, although it uses a gel electrolyte and is only suitable up to 80 °C. If you are looking for a glass-sheathed probe with a polymer electrolyte and a temperature sensor, the SenTix RJD is the right choice.

Typical applications

• Diluted acids and alkalis, emulsions and suspensions
• Sulphide-containing liquids, cooling water, dyeing solutions and electroplating baths
• Cutting oil emulsions, electroplating effluent and industrial wastewater
• Swimming pool water, waste water, groundwater, lake water, surface water and seawater
• Hair dye, lotions and creams, mouthwash and toothpaste
• Honey, jam, mayonnaise and vinegar
• Emulsion paints, as well as water-soluble paints and varnishes

Commissioning, storage and cleaning

Before the first measurement, remove the wicking cap. Keep it, as it is needed for storage. Gas bubbles behind the diaphragm can be removed by shaking. The diaphragm at the lower end of the shaft must be fully immersed in the sample; only the shaft is immersed. During measurement breaks, the electrode should be kept in reference electrolyte (3 mol/l KCl, Ag⁺-free); overnight, it should be stored in the cap filled with this solution. Grease and oil can be removed with water containing washing-up liquid, whilst limescale and hydroxide deposits can be removed with 10 per cent citric acid; in both cases, contact time should be kept as short as possible. Hydrofluoric acid, hot phosphoric acid and strong alkalis destroy the glass membrane. Like any pH measuring chain, the Top 41 is a consumable item, and high temperatures or sharp fluctuations in temperature and pH shorten its service life.

Calibration and accessories

Calibration is carried out in accordance with the meter’s instructions, under stirring conditions similar to those used during measurement. The probe should be immersed vertically or at a slight angle. WTW buffer solutions (DIN/NIST and technical) are suitable for calibration. These are complemented by the A pHLab/K plastic armature (item no. 903841), the STH 650 bench stand (item no. 109809) and the KCl-250 reference electrolyte (item no. 109705) for storage.

Technical details

Scope of delivery

• 1 WTW SenTix Top 41 pH electrode with irrigation cap

Individual requirements and procurement service

Buffer solutions, a stand and mounting bracket are supplied with the electrode. The procurement service will be happy to clarify in advance whether the Top 41 is suitable for a specific sample at lt-laborhandel.com/service.