Xylem WTW TetraCon 925 Bedienungsanleitung

OPERATING MANUAL

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TetraCon®925 (/C)(-P)

CONDUCTIVITY CELL

TetraCon®925

TetraCon®925-P

TetraCon®925/C

OPERATING MANUAL

ba75824e04 04/2015

TetraCon®925

Reproduction in whole - or even in part - is prohibited without the

express written permission of WTW GmbH, Weilheim.

Printed in Germany.

For the most recent version of the manual, please visit

www.WTW.com.

TetraCon®925 (/C)(-P) Contents

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Contents

1 Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

1.1 Structure and function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

1.2 Recommended fields of application . . . . . . . . . . . . . . . . . . . . . . 5

2 Measuring / Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

2.1 Commissioning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

2.2 Opening and closing the IDS plug connection

(TetraCon®925-P) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

3 Cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

4 What to do if... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

5 Technical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

5.1 General data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

5.2 Measuring ranges, resolution, accuracy . . . . . . . . . . . . . . . . . . 11

5.3 Accuracy of the IDS measuring technique . . . . . . . . . . . . . . . . 11

6 Wear parts and accessories . . . . . . . . . . . . . . . . . . . . . . . . . 12

Contents TetraCon®925 (/C)(-P)

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TetraCon®925 (/C)(-P) Overview

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1 Overview

1.1 Structure and function

Structure

Automatic sensor

recognition

The sensor electronics with the stored sensor data is in the connecting head.

The data include, among other things, the sensor type and series number.

With each calibration, the calibration data is written in the sensor and the

calibration history is recorded. The data is recalled by the meter when the

sensor is connected and is used for measurement and for measured value

documentation. Storing the calibration data in the sensor ensures that the

correct cell constant is automatically used if the sensor is operated with

several meters.

The digital transmission technique guarantees the failure-free

communication with the meter even with long connection cables. If the sensor

firmware is enhanced by WTW, it can be updated via the meter.

1.2 Recommended fields of application

On site measurements in rivers, lakes and wastewater

Fish farming

Ground water measurements

Applications in water laboratories

1Voltage electrode (inside, 2x)

2Current electrode (ring, 2x)

3Temperature sensor in graphite enclosure

4Shaft

5Connecting head with active electronics

6Connection cable (TetraCon®925(/C))

7IDS plug (TetraCon®925-P)

41, 2 3 5

TetraCon 925(/C)

TetraCon 925-P

Measuring / Operation TetraCon®925 (/C)(-P)

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Due to the use of high performance PEEK material for the connection

technology TetraCon®925/C has an improved chemical resistance,

especially in acid media (eg. As electroplating baths).

NOTE

Concentrated or strong oxidizing acids and organic solvents can

damage or destroy the sensor.

2 Measuring / Operation

2.1 Commissioning

Scope of delivery Conductivity measuring cellTetraCon®925 (/C)(-P)

Operating manual

Preparing the

sensor for

measurement

TetraCon®925(/C) Connect the sensor to the meter.

The sensor is immediately ready to measure.

TetraCon®925-P Connect the sensor to a free IDS sensor plug-in

position of the multi parameter probe or to an IDS

connection of the meter. To open and close the

IDS plug-in position please note the section 2.2

OPENING AND CLOSING THE IDS PLUG CONNECTION

(TETRACON®925-P).

The sensor is immediately ready to measure.

Connection cables in different lengths to connect

the TetraCon®925-P sensor to the meter are listed

in chapter 6 WEAR PARTS AND ACCESSORIES.

TetraCon®925 (/C)(-P) Measuring / Operation

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2.2 Opening and closing the IDS plug connection

(TetraCon®925-P)

This section only applies to the IDS plug variant, TetraCon®925-P.

Opening the plug

connection

If necessary, clean the plug connection

Open the locking device (step 1)

Use your thumb and index finger to press the clips of the connector

together, and pull the connector out of the plug (step 2).

Closing the plug

connection

Make sure that the plug connection is completely dry and clean.

Align the guidance of the connector with the groove in the plug and insert

the connector in the unlocked plug until it catches (step 3).

Close the locking device (step 4).

Plug connection

closed and locked

Guidance

Groove

Cleaning TetraCon®925 (/C)(-P)

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3 Cleaning

NOTE

Prior to cleaning, disconnect the sensor from the meter.

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

media (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 failure caused by measuring conditions and

mechanical damage.

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

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 wash-

ing-up liquid

Error symptom Cause Remedy

No temperature or conductivity

display

– No connection between meter

and conductivity measuring

cell

– Cable defective

– Establish connection

between meter and

conductivity measuring

cell

Measurement delivers implausi-

ble conductivity values

– Measuring range exceeded

– Contamination in the area of

the electrodes

– Electrodes damaged

– Make sure the correct

sensor is being used for

the application

– Clean the conductivity

measuring cell (see

section 3).

– 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 the conductivity

measuring cell

TetraCon®925 (/C)(-P) Technical data

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5 Technical data

5.1 General data

General features Measuring principle Four-electrodes measurement

Cell constant 0.475 cm-1 ±1.5 %

Temperature sensor Integrated NTC 30 (30 kat 25 °C / 77 °F)

Dimensions

(in mm)

Weights TetraCon®925(/C) 60 g (without cable)

TetraCon®925-P 65 g

Materials Shaft Epoxy

Connection head TetraCon®925(-P):POM

TetraCon®925/C:PEEK

Conductivity electrodes Graphite

Thermistor enclosure Graphite

Connection cable Lengths TetraCon®925:1,5 / 3 m

TetraCon®925-P:

1,5 / 3 / 6 / 10 / 15 / 25 / 40 / 60 / 100 m

TetraCon®925/C:1,5 m

Diameter 4.3 mm

120,0

176,0

222,8

15,3

21,7

TetraCon 925(/C):

TetraCon 925-P:

Technical data TetraCon®925 (/C)(-P)

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Smallest allowed

bend radius

Fixed installation:20 mm

Flexible use:60 mm

Plug type Socket, 4 pins

IDS plug

(TetraCon®925-P)

Connection type 4-pole, watertight plug connection with lock,

reverse polarity protected

Materials Synthetic materials: Glass fiber reinforced

Noryl, TPU, TPC-ET, POM, PEEK, PBT

O-ring: FPM

Contacts gold-plated

Pressure

resistance

Sensor with connection

cable

IP 68 (2.5 x 105Pa or 2.5 bar)

Cable plug

(TetraCon®925)

IP 67 (when plugged in)

The TetraCon®925 (/C)(-P) meets the requirements according to article

3(3) of the directive, 97/23/EC ("pressure equipment directive").

Measurement

conditions

Conductivity measuring

range

1 S/cm ... 2 S/cm

Temperature range -5 ... 70 °C (100 °C) (23 ... 158 °F (212 °F))

Max. admissible overpres-

sure

TetraCon®925(/C):2,5 x 105Pa (2,5 bar)

TetraCon®925-P:1 x 106Pa (10 bar)

Minimum depth of immer-

sion

36 mm

Maximum depth of immer-

sion

(at temperature)

Whole sensor + cable up to 70 °C (158 °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

Characteristic data

on delivery

Temperature responding

behavior

t99 (99 % of the final value display after)

<20s

Accuracy of the temperature

sensor

± 0,2 K

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