Wtw KLE 325 Bedienungsanleitung

KLE 325

ba75798e02 01/2009 9

Operating manual

Standard conductivity measuring cell

KLE 325

10 ba75798e02 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.

KLE 325 Contents

Contents

ba75798e02 01/2009

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

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

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

2 Cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

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

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

Overview KLE 325

12 ba75798e02 01/2009

1Overview

1.1 Structure and function

Structure

1.2 Recommended fields of application

zOn site measurements in rivers, lakes and wastewater

zFish farming

zGround water measurements

zApplications in water laboratories

1Measuring electrode

2Temperature sensor in graphite enclosure

3Shaft

4Closing head

5Cable screw joint

35214

KLE 325 Cleaning

ba75798e02 01/2009

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.

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

mediums (e.g. strong acids and bases, organic solvents) or temperatures

that are too high may considerably reduce its lifetime or lead to damage. The

warranty does not cover cases where such conditions cause failure or

mechanical damage.

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

3 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 containing washing-

up liquid

Error symptom Cause Remedy

No temperature or

conductivity display

– No connection between

measuring instrument and

conductivity measuring cell

– Cable defective

– Connection between measuring

instrument and conductivity

measuring cell

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

– Make sure the correct sensor is

being used for the application

– Clean the conductivity measuring

cell (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 conductivity measuring

cell

Technical data KLE 325

14 ba75798e02 01/2009

4 Technical data

General features Measuring principle 2-electrodes measurement

Cell constant 0.84 cm-1 ±1.5 %

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

Dimensions

(in mm)

Weight approx. 135 g

Materials Shaft Epoxy

Connection head POM

Cable screw joint PA

Conductivity electrodes Graphite

Thermistor enclosure Graphite

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 KLE 325 meets the requirements according to article 3(3) of the

directive, 97/23/EC ("pressure equipment directive").

15.3 21.7

120.0

168.0

16.5

KLE 325 Technical data

ba75798e02 01/2009

Pin assignment

Measurement

conditions Conductivity measuring

range

10 PS/cm ... 20 mS/cm

Temperature range 0 ... 80 °C (32 ... 176 °F)

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

Minimum depth of

immersion

36 mm

Maximum depth of

immersion

Entire sensor +cable

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 display after)

<20s

Precision of the temperature

sensor

± 0.2 K

NTC

30 kW

NTC

Shield

not used

Plug from the front: 4

Electrode

Technical data KLE 325

16 ba75798e02 01/2009

Wissenschaftlich-Technische Werkstätten GmbH

Dr.-Karl-Slevogt-Straße 1

D-82362 Weilheim

Germany

Tel: +49 (0) 881 183-0

+49 (0) 881 183-100

Fax: +49 (0) 881 183-420

E-Mail: Info@WTW.com

Internet: http://www.WTW.com

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