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

Technical data LR 325/01
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4 Technical data
General features Measuring principle Two-electrode measurement
Cell constant 0.100 cm-1 ±2 %
Temperature sensor integrated NTC 30 (30 kΩ/ 25 °C)
Dimensions
(in mm)
Weight approx. 135 g
Materials Shaft Epoxy
Connection head POM
Conductivity electrodes Stainless steel 1.4571
Thermistor enclosure Stainless steel 1.4571
Connection cable Lengths 1,5 m
Diameter 6 mm
Smallest allowed
bend radius
Permanent bend: 80 mm
Single time or short time bend: 50 mm
Plug type Socket, 8 pins
Pressure
resistance
Sensor with closed plug
connection
IP 68 (2 x 105Pa or 2 bar)
Cable plug IP 67 (when plugged in)
The LR 325/01 meets the requirements according to article 3(3) of the 97/
23/EC directive ("Pressure equipment directive").
120.0
165
12.0 17.5

LR 325/01 Technical data
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Pin assignment
Measurement
conditions
Conductivity measuring
range
0.001 µS/cm ... 200 µS/cm
The measuring range may be limited by the
meter that is used (see measuring range of
your meter).
Temperature range -5 ... 80 °C (100 °C)
Max. allowed overpressure 2 x 105Pa (2 bar)
Minumum depth of immer-
sion
30 mm
Maximum depth of immer-
sion
Entire sensor+cable (up to 80 °C)
Sensor shaft only (=120 mm / up to 100 °C)
Operating position any
Storage
conditions
Recommended storing
method
in air
Storage temperature 0 ... 50 °C
Characteristic data
on delivery
Temperature responding
behavior
t99 (99 % of the final value after) < 20 s
Precision of the temperature
sensor
±0.2K
4
2
5
3
NTC
NTC
Shield
not used
Plug from the front: 4
5
7
38
2
6
1
4
2
5
3
8
6
1
7
NTC
30 k
Outer electrode
Inner electrode

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Xylem Analytics Germany GmbH
Dr.-Karl-Slevogt-Str. 1
82362 Weilheim
Germany
Xylem Analytics Germany
Sales GmbH & Co. KG
WTW
Dr.-Karl-Slevogt-Str. 1
82362 Weilheim
Germany
Tel.:
Fax:
E-Mail
Internet:
[phone]
[phone]
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www.WTW.com
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