Wtw LR 325/01 Bedienungsanleitung

ba55303e05 01/2009

LR 325/01

Operating manual

Ultrapure water conductivity cell

LR 325/01

ba55303e05 01/2009

Accuracy when

going to press The use of advanced technology and the high quality standard of our

instruments are the result of continuous development. This may result in

differences between this operating manual and your instrument. Also, we

cannot guarantee that there are absolutely no errors in this manual.

Therefore, we are sure you will understand that we cannot accept any legal

claims resulting from the data, figures or descriptions.

Reprinting - even as excerpts - is only allowed with the explicit written

authorization of WTW GmbH, Weilheim.

Printed in Germany.

LR 325/01 Inhaltsverzeichnis

ba55303e05 01/2009

LR 325/01 - Contents

1 Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

1.1 Structure and function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

1.2 Recommended fields of application . . . . . . . . . . . . . . . . . . . . 12

2 Cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

3 What to do if... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

4 Technical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

Overview LR 325/01

12 ba55303e05 01/2009

1Overview

1.1 Structure and function

Structure

1.2 Recommended fields of application

Measurements 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.

Disposal We recommend to dispose of the conductivity cell as electronic waste.

1Shaft

2Connection head

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...

ba55303e05 01/2009

3 What to do if...

Error symptom Cause Remedy

No temperature or

conductivity 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

14 ba55303e05 01/2009

4 Technical data

General features Measuring principle Two-electrode measurement

Cell constant 0.100 cm-1 ±2 %

Temperature sensor integrated NTC 30 (30 k:at 25 °C / 77 °F)

Dimensions

(in mm)

Weight approx. 135 g

Materials Shaft Stainless steel 1.4571

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

fixed installation: 50 mm

flexible use: 80 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

ba55303e05 01/2009

Pin assignment

Measurement

conditions Conductivity measuring

range

0.001 µS/cm ... 200 µS/cm

Temperature range -5 ... 80 °C (100 °C)

23 ... 176 °F (212 °F)

Max. allowed overpressure 2 x 105Pa (2 bar)

Minumum depth of immer-

sion

30 mm

Maximum depth of

immersion

(at temperature)

Whole sensor + cable up to 80 °C (176 °F)

Sensor shaft only (=120 mm) up to 100 °C

(212 °F)

Operating position any

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 after) < 20 s

Precision of the temperature

sensor

±0.2K

NTC

Shield

not used

Plug from the front: 4

NTC

30 k

Outer electrode

Inner electrode

Technical data LR 325/01

16 ba55303e05 01/2009

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