SenTix® 940 SenTix® 940-3 SenTix® F 900 SenTix® F 900-3 pH electrode with gel electrolyte Operating manual ba75844e02 04/2010
SenTix Note The latest version of the present operating manual can be found on the Internet under www.WTW.com. Copyright © Weilheim 2010, WTW GmbH Reprinting - even as excerpts - is only allowed with the explicit written authorization of WTW GmbH, Weilheim. Printed in Germany.
SenTix General information General information Automatic sensor recognition The sensor electronics with the stored sensor data is in the connecting head of the electrode. The data include, among other things, the sensor type and series number. With each calibration, the calibration data is written in the sensor and the calibration history is recorded. The data is recalled by the meter when the sensor is connected and is used for measurement and for measured value documentation.
Commissioning, measuring, calibration SenTix Shaft dimensions, material, electrical connection WTW model Shaft Electrical connection Length [mm] Ø [mm] Material Combination Meter conelectrode nection connection SenTix® 940 120 12 PPE/PS Fixed cable Digital plug 1.5 m SenTix® 940-3 120 12 PPE/PS Fixed cable Digital plug 3m SenTix® F 900 120 12 COC Fixed cable Digital plug 1.
SenTix Storage Calibration and measurement: General rules z Avoid the carryover of any solution (sample or buffer solution) from one measurement to the next by taking the following measures: – Shortly rinse the calibration and sample beakers with the solution the beakers are to be filled with next. – Between measurements, rinse the electrode with the solution that follows. Alternatively, you can also rinse the electrode with deionized water and then carefully dab it dry.
Aging SenTix Overnight or longer Put the clean electrode in the watering cap that is filled with reference electrolyte (KCl 3 mol/L, Ag+ free). Note pH electrodes must not be stored dry or in deionized water. The electrode could be permanently damaged by this. If the liquid in the watering cap has dried up, condition the electrode in reference electrolyte (KCl 3 mol/L, Ag+ + free) for at least 24 hours. Note During longer storing periods, salt sediments may develop on the watering cap.
SenTix Maintenance and cleaning Maintenance and cleaning Cleaning Remove water-soluble contamination by rinsing with deionized water.
Wear parts and accessories 16 SenTix ba75844e02 04/2010
