wtw LR 325/01 User manual

OPERATING MANUAL
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LR 325/01
ULTRAPURE WATER CONDUCTIVITY CELL
OPERATING MANUAL

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LR 325/01
Copyright ©2017 Xylem Analytics Germany GmbH
Printed in Germany.

LR 325/01 Contents
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LR 325/01 - Contents
1 Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
1.1 Structure and function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
1.2 Recommended fields of application . . . . . . . . . . . . . . . . . . . . . 4
2 Cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
3 What to do if... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
4 Technical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Overview LR 325/01
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1Overview
1.1 Structure and function
Structure
1.2 Recommended fields of application
Measurments in ultapure water.
2 Cleaning
Caution
Before cleaning, disconnect the sensor from the instrument.
Cleaning A thorough cleaning is particularly recommended for measurements of low
conductivities.
After cleaning, thoroughly rinse with deionized water and recalibrate if
necessary.
Aging of the
conductivity
measuring cell
Normally, the conductivity measuring cell does not age. Special measuring
media (e.g. strong acids and lyes, organic solvents) or too high temperatures
shorten the operational lifetime considerably or damage the measuring cell.
The warranty does not cover cases where such conditions cause failure or
mechanical damage.
1Shaft
2Connection head
21
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

LR 325/01 What to do if...
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Disposal We recommend to dispose of the conductivity cell as electronic waste.
3 What to do if...
Error symptom Cause Remedy
No temperature or con-
ductivity display
– No connection between
measuring instrument and sensor
– Cable defective
– Check connection between
measuring instrument and sensor
Measurement delivers
implausible conductivity
values
– Incorrect cell constant adjusted at
the measuring instrument
– Measuring range exceeded
– Contamination in the area of the
electrodes
– Electrodes damaged
– Check / correct the cell constant
– Observe the application range
– Clean the sensor (see section 2).
– Return the sensor
Incorrect temperature
display
– The temperature sensor was not
immersed deep enough in the
measuring solution
– Temperature sensor defective
– Observe the minimum immersion
depth
– Return the sensor