Operating manual LR 925/01 Ultrapure water conductivity measuring cell ba75825e01 08/2009
LR 925/01 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.
LR 925/01 Contents LR 925/01 - Contents 1 Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 1.1 1.2 2 Cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 3 What to do if... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 4 Technical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 4.1 4.2 4.3 ba75825e01 08/2009 Structure and function . . . . . . . . . . .
Overview LR 925/01 1 Overview 1.1 Structure and function Structure 1 Automatic sensor recognition 1 Shaft 2 Connecting head with active electronics 2 The sensor electronics with the stored sensor data is in the connecting head. 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.
LR 925/01 Cleaning 2 Cleaning CAUTION To clean the sensor, disconnect it from the instrument. Outside cleaning We recommend to clean the sensor thoroughly, especially before measuring low conductivity values. Contamination Cleaning procedure Lime sediments Immerse in acetic acid for 5 minutes (volume share = 10 %) Fat/oil Clean with warm water that contains washing-up liquid After cleaning, thoroughly rinse with deionized water and recalibrate if necessary.
Technical data General features LR 925/01 4 Technical data 4.1 General data Measuring principle 2-electrodes measurement Cell constant 0.100 cm-1 ± 2 % Temperature sensor Integrated NTC 30 (30 k: at 25 °C / 77 °F) Dimensions (in mm) 176.0 120.0 12.0 Weight Materials Connection cable Pressure resistance 21.7 Approx. 90 g (without cable) Shaft Stainless steel 1.4571 Connection head POM Conductivity electrodes Stainless steel 1.4571 Thermistor enclosure Stainless steel 1.
LR 925/01 Technical data Measurement conditions Storage conditions Characteristic data on delivery Conductivity measuring range 0.01 μS/cm ... 200 μS/cm Temperature range -5 ... 70 °C (100 °C) 23 ... 158 °F (212 °F) Max.
Technical data LR 925/01 4.3 16 Accuracy of the IDS measuring technique Measured parameter Accuracy (± 1 digit) ӕ, ρ ± 0.5 % of measured value T [°C] ± 0.
