WTW SenTix 62 Glass PH Electrode with Liquid Electrolyte, Refillable, BNC, 1 m Cable, 103641

The WTW SenTix 62 is a glass electrode with a conical membrane, a platinum wire diaphragm and a refillable liquid electrolyte (KCl 3 mol/l, Ag+-free). It measures pH from 0 to 14 at temperatures ranging from 0 to 100 °C. It does not have a temperature sensor.

Glass shaft, conical membrane, platinum wire diaphragm

The glass shaft is 120 mm long with a diameter of 12 mm; the membrane resistance is less than 600 MΩ. The 1 m long fixed cable is fitted with a BNC connector. The electrode is designed for laboratory use. Between measurements, it should be rinsed with the next solution or with deionised water and carefully dabbed dry to ensure no solution is carried over. The frequency of recalibration depends on the application.

With or without a temperature sensor

If you wish to measure temperature automatically, choose the SenTix 82. It has the same design but features an NTC sensor. The SenTix 60 is available with an S7 connector head instead of a fixed cable, in which case the cable must be selected separately. If you are working without a sensor, for the 62 you will need either the temperature from a second measurement or a separate temperature sensor.

Topping up the electrolyte

The measuring cell is filled at the factory. Before use, the refill port is opened and remains open during calibration and measurement. The electrolyte level should be at least 2 cm above the level of the sample. If it drops, top up with reference electrolyte; the easiest way is to use the dropper bottle supplied: cut the tip straight across, press it into the refill port and pump the electrolyte into the shaft.

Storage and cleaning

During short breaks, the electrode should be left standing in the reference electrolyte with the refill opening open. Overnight, it should be placed in the filled rinsing cap, with the refill opening closed. If stored dry or in deionised water, it will suffer permanent damage. For protein contamination, soak in Pepsin cleaning solution PEP/pH (item no. 109648) for about an hour; for grease and oil, use water containing washing-up liquid; for limescale, use a 10 per cent citric acid solution. Afterwards, condition the electrode in reference electrolyte for at least one hour and recalibrate it.

Typical applications

• Drinking water, mineral water, groundwater, lake water, surface water and seawater, swimming pool water
• Beer, lemonade, fruit juice, vegetable juice, wine, milk, coffee extract and vinegar
• Soil extracts, paper extracts and salt solutions
• Diluted acids, emulsions, suspensions, cooling water, dye solutions and electroplating baths
• Hair dye, mouthwash and household cleaners
• Enzyme solutions, gastric juice, infusion solutions, serum, Tris buffer solutions, urine and other protein-containing liquids

Accessories: Reference electrolyte KCl-250 (item no. 109705), WTW buffer solutions, plastic arm A pHLab/K (item no. 903841) and STH 650 bench stand (item no. 109809).

Technical details

Scope of delivery

• 1 WTW SenTix 62 pH electrode with rinsing cap
• Dropper bottle with reference electrolyte for refilling

Individual requirements and procurement service

Electrolyte, buffer solutions, cleaning solution or an electrode with a different connection: contact lt-laborhandel.com/service to enquire about the right product, even if you do not yet know which SenTix model is compatible with your measuring instrument.