Operating manual TetraCon® 925 Standard conductivity measuring cell ba75824e01 08/2009
TetraCon® 925 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.
TetraCon® 925 Contents TetraCon® 925 - 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 ba75824e01 08/2009 Structure and function . . . . . .
TetraCon® 925 Overview 1 Overview 1.1 Structure and function Structure 1, 2 3 Automatic sensor recognition 4 1 Voltage electrode (inside, 2x) 2 Current electrode (ring, 2x) 3 Temperature sensor in graphite enclosure 4 Shaft 5 Connecting head with active electronics 5 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.
TetraCon® 925 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.
TetraCon® 925 Technical data General features 4 Technical data 4.1 General data Measuring principle Four-electrodes measurement Cell constant 0.475 cm-1 ±1.5 % Temperature sensor Integrated NTC 30 (30 k: at 25 °C / 77 °F) Dimensions (in mm) 176.0 120.0 15.3 Weight Materials Connection cable Pressure resistance 21.7 Approx. 60 g (without cable) Shaft Epoxy Connection head POM Conductivity electrodes Graphite Thermistor enclosure Graphite Lengths 1,5 / 3 / 6 / 25 m Diameter 4.
TetraCon® 925 Technical data Measurement conditions Storage conditions Characteristic data on delivery ba75824e01 08/2009 Conductivity measuring range 1 PS/cm ... 2 S/cm Temperature range -5 ... 70 °C (100 °C) (23 ... 158 °F (212 °F)) Max. admissible overpressure 2.5 x 105 Pa (2.
TetraCon® 925 Technical data 4.2 Measuring ranges, resolution Measured parameter Measuring range Resolution ӕ [µS/cm] 0.0 ... 199.9 200 ... 1999 0.1 1 ӕ [mS/cm] 2.00 ... 19.99 20.0 ... 199.9 200 ... 2000 0.01 0.1 1 ρ (Resistivity) [Ohm*cm] 0.50 ... 9.99 10.0 ... 99.9 100 ... 999 0.01 0.1 1 ρ (Resistivity) [kOhm*cm] 1.00 ... 9.99 10.0 ... 99.9 100 ... 999 0.01 0.1 1 ρ (Resistivity) [MOhm*cm] 1.00 ... 9.99 0.01 SAL 0.0 ... 70.0 according to IOT table 0.1 TDS 0 ... 1999 mg/l 0 ... 19.
