SenTix® ORP 900 ORP electrode Operating manual ba75845e01 08/2009
SenTix Note The latest version of the present operating manual can be found on the Internet under www.WTW.com. Copyright © Weilheim 2009, 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. The data is recalled by the meter when the sensor is connected and is used for measurement and for measured value documentation. The digital transmission technique guarantees the failure-free communication with the meter even with long connection cables.
Commissioning, measuring, checking SenTix Commissioning, measuring, checking Note For ORP electrodes with platinum electrode, please follow the instructions in Abschnitt ACTIVATING PLATINUM ELECTRODES. Commissioning Prepare the electrode for measuring as follows: z Open the refilling opening for the reference electrolyte solution. Depending on the model, the stopper of the refilling opening is an elastomer stopper or a slider.
SenTix Commissioning, measuring, checking SenTix® ORP 900 At the same time, the level of the reference electrolyte must be at least 2 cm above the level of the solution.
Aging SenTix Storage During short measuring breaks Immerse the electrode in the reference electrolyte with the refilling opening open. Electrode Reference electrolyte WTW model (see page 19) SenTix® ORP 900 3 mol/l KCl, Ag+free KCl-250 (250 ml) Prior to the next measurement, shortly rinse the electrode with the test sample or deionized water. Overnight or longer Insert the clean electrode into the watering cap filled with reference electrolyte and shut the refilling opening.
SenTix Aging Maintenance and cleaning During operation, a small amount of reference electrolyte leaks through the junction from the electrode into the test sample. If the level of reference electrolyte becomes too low with time, refill it through the refilling opening. Refilling the reference electrolyte Refilling is very easy using a dropping bottle.
Activating platinum electrodes Cleaning SenTix Remove water-soluble contamination by rinsing with deionized water. Remove other contamination as follows: Contamination Cleaning procedure Fat and oil Rinse with water containing household washing-up liquid Lime and hydroxide deposits Rinse with citric acid (10 % by weight) Protein Immerse in pepsin cleaning solution PEP/pH for approx. 1 hour. Note: Make sure the level of the reference electrolyte is above that of the cleaning solution.
SenTix Wear parts and accessories 1000 UH in mV 800 oxidizing pretreatment 600 400 reducing pretreatment 200 0 0 2 Oxidizing pretreatment 4 6 8 10 12 14 pH value Immerse the platinum electrode for two to three days in a sulfuric acid chlorine solution. Chlorine powder for producing the solution is included in the SORT/RH reagent set.
Wear parts and accessories 20 SenTix ba75845e01 08/2009
