wtw LR 325/001 User manual

OPERATING MANUAL
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Flow-through cell
Immersion cell
LR 325/001
ULTRAPURE WATER CONDUCTIVITY MEASURING CELL

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LR 325/001
©2017 Xylem Analytics Germany GmbH
Printed in Germany.

LR 325/001 - Contents
LR 325/001 Contents
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1 Overview. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
1.1 Structure and function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
1.2 Recommended fields of application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
2 Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
2.1 Changing between flow-through cell and immersion cell . . . . . . . . . . . . . . . . . . . . . . . . . . 5
2.2 Use as flow-through cell . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
3 Cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
4 What to do if... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
5 Technical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

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Overview LR 325/001
1Overview
1.1 Structure and function
Structure
1.2 Recommended fields of application
Measurements in ultrapure water in flow-through or immersion operation,
depending on the mounted outside electrode.
1Connection head
2Shaft with inside electrode and temperature sensor
3Outside electrode of the flow-through cell
4Outside electrode of the immersion cell
1
2
3
4
Flow-through cell: Immersion cell:

LR 325/001 Installation
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2 Installation
2.1 Changing between flow-through cell and immersion cell
The outside electrode is connected to the shaft via a screw connection and
can be removed and replaced as necessary without using any tools. When
mounting the electrode tighten the screw connection by hand as far as it will
go.
2.2 Use as flow-through cell
To avoid the collection of air bubbles in the electrode area, the flow-through
cell should be positioned so that the outlet opening is at the highest point. An
incline of the sensor by up to 60° supports the removal of air bubbles (see
following figure).
Outlet Maximum
incline 60°
Outlet points
upward
Inlet

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Cleaning LR 325/001
3 Cleaning
CAUTION
Prior to cleaning, disconnect the sensor from the meter.
Outside cleaning We recommend to clean the sensor thoroughly, especially prior to measuring
low conductivity values. If necessary, unscrew the outside electrode from the
shaft.
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.
4 What to do if...
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
Error symptom Cause Remedy
No temperature or
conductivity display
– Connection meter - conductivity
measuring cell interrupted
– Cable defective
– Check connection meter -
conductivity measuring cell
Measurement delivers
implausible conductivity
values
– Cell constant incorrectly set at the
measuring instrument
– Measuring range exceeded
– Outside electrode not completely
screwed on
– Dirt in electrode area
– Air bubbles in electrode area
– Electrodes damaged
– Check / correct the setting
– Observe the application range
– Tighten outside electrode by
hand as far as it will go
– Clean the conductivity measuring
cell (see Abschnitt 3).
– Remove air bubbles by knocking
laterally
– Return the sensor
Incorrect temperature
display
– The temperature sensor is not
immersed deep enough in the
measuring solution
– Temperature sensor defective
– Observe the minimum immersion
depth
– Return conductivity measuring
cell

LR 325/001 Technical data
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5 Technical data
General features Measuring principle Two-electrode measurement
Cell constant 0.0100 cm-1 ±2 %
Temperature sensor integrated NTC 30 (30 kat 25 °C / 77 °F)
Dimensions
(in mm)
Weight (with
connection cable)
Immersion cell 277 g
Flow-through cell 487 g
Materials Shaft Stainless steel 1.4571
Connection head with cable
gland
POM
Inside electrode /
temperature sensor
Stainless steel 1.4571
Insulator POM
707028
208
20.0
7.6
40.0
Thread G 1/8''
Outlet
Inlet
Flow-through cell:
Immersion cell:
Minimum immersion depth 40 mm
120
160
20.0 25.0
25.0
17.5
17.5

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Technical data LR 325/001
Outside electrodes, hose
nozzles
Stainless steel 1.4571
Cable PUR
Seals NBR
Connection cable Length 1.5 m
Diameter 6 mm
Smallest allowed
bend radius
fixed installation: 50 mm
flexible use: 80 mm
Plug type Socket, 8 pins
Pressure
resistance
Sensor with connection
cable
IP 68 (2 x 105Pa or 2 bar)
Cable plug IP 67 (when plugged in)
The LR 325/001 meets the requirements according to article 3(3) of the 97/
23/EC directive ("Pressure equipment directive").
Measurement
conditions
Conductivity measuring
range
0.0001 μS/cm ... 30 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) / 23 ... 176 °F (212 °F)
Max. allowed overpressure 2 x 105Pa (2 bar)
Minimum immersion depth
in immersion cell operation
40 mm
Maximum immersion depth
(at temperature)
Total sensor+cable (up to 80 °C / 176 °F)
Sensor shaft only = 120 mm (up to 100 °C /
212 °F)
Operating position Immersion cell: Any
Flow-through cell: Vertical or inclined by up
to approx. 60°, inlet
pointing downward
Storage conditions Recommended storing
method
in air
Storage temperature 0 ... 50 °C (32 ... 122 °F)
Characteristic data
on delivery
Temperature responding
behavior
t99 (99 % of the final value display after)
< 100 s
Precision of the temperature
sensor
±0.2K

LR 325/001 Technical data
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Pin-assignment
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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Technical data LR 325/001

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82362 Weilheim
Germany
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WTW
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Germany
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