wtw SensoLyt 690 Operating instructions

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SensoLyt

®

690

ba15312de

25

ba15312de02 09/00

Operating manual

pH/ORP armature with integrated

temperature probe

26

Accuracy when

going to press

The use of advanced technology and the high quality

standard of our products are the result of a continuous

development. This may result in differences between this

operating manual and your armature. 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.

Copyright

Reprinting - even as excerpts - is only allowed with the

explicit written authorization of WTW GmbH & Co. KG,

Weilheim.

Printed in Germany.

Contents

27

1 General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

2 Safety . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31

2.1 Authorized use . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .32

2.2 General safety instructions . . . . . . . . . . . . . . . . . . . . . 32

3 Commissioning . . . . . . . . . . . . . . . . . . . . . . . . . . 33

3.1 General instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . 33

3.2 Commissioning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33

4 Maintenance and replacing the electrode . . . . . 37

5 Spare parts and accessories . . . . . . . . . . . . . . . 41

5.1 Combined electrodes . . . . . . . . . . . . . . . . . . . . . . . . . .41

5.2 General accessories . . . . . . . . . . . . . . . . . . . . . . . . . . 41

6 What to do if ... . . . . . . . . . . . . . . . . . . . . . . . . . . . 43

7 Technical data . . . . . . . . . . . . . . . . . . . . . . . . . . . 45

7.1 General features . . . . . . . . . . . . . . . . . . . . . . . . . . . . .45

7.2 Measuring conditions . . . . . . . . . . . . . . . . . . . . . . . . . . 45

7.3 Characteristics when delivered . . . . . . . . . . . . . . . . . . 46

7.4 Electrical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47

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General

29

1 General

View of the

SensoLyt

®

690

Connected with the SensoLyt



SEA or SensoLyt



GDA

pH electrodes or the SensoLyt



PtA ORP electrode, the

SensoLyt



690 pH armature is suitable for mobile field use

and for on-line measurements.

General

30

A pre-amplifier integrated in the armature shaft converts the

high-impedance measuring signal of the electrode to a low-

impedance signal. This facilitates to transmit signals

interference-free even over greater distances.

Construction of the

SensoLyt

®

690

The pH combined electrode is available as an accessory

(see chapter 5 S

PARE PARTS AND ACCESSORIES).

Shielding of the pH

electrode

Together with the corresponding WTW industrial monitor,

the pH electrode and the pH armature form a measuring

system which is screened to a high degree from low and

high frequency interferences as well as from lightning.

1 Protection hood

2 Combined electrode (not contained in the scope

of delivery)

3 Temperature sensor

4 Electrode receptacle

5 Housing

6 Protection ring

1

26

5

3

4

Safety

31

2 Safety

This operating manual contains basic instructions that you

must follow during commissioning, operation and

maintenance. Consequently, all responsible personnel must

read this operating manual before working with the

armature. The operating manual must always be available

within the vicinity of the armature.

Target group The pH armature was designed for use with online

instrumentation - mostly in waste water treatment plants.

Thus, we assume that, as a result of their professional

training and experience, the operators will know the

necessary safety precautions to take when handling

chemicals.

Safety instructions In the individual chapters of this operating manual, the

following safety instructions indicate different danger levels:

Danger

indicates notes that have to be exactly observed to avoid

possibly great danger for people.

Warning

indicates notes that have to be exactly observed to avoid

possible slight injuries or damage to your instrument or the

environment.

Further notes

Note

indicates notes that draw your attention to special features.

Note

indicates cross references to other documents, e. g.

operating manuals.

Safety

32

2.1 Authorized use

The technical specifications as given in chapter 7 TECHNICAL

DATA must be observed. Only the operation and running of

the armature according to the instructions given in this

operating manual is authorized. Any other use is considered

unauthorized.

2.2 General safety instructions

The armature left the factory in a safe and secure technical

condition.

Function and

operating safety

The smooth functioning and operational safety of the

armature can only be guaranteed if the generally applicable

safety measures and the specific safety instructions in this

operating manual are followed during operation.

The smooth functioning and operational safety of the

armature can only be guaranteed under the environmental

and electrical operating conditions that are specified in

chapter 7 T

ECHNICAL DATA.

The temperature specified for using the armature (chapter 7

T

ECHNICAL DATA) has to be observed. Protect your armature

especially against frost or overheating.

Warning

The armature is only allowed to be opened by personnel

authorized by WTW.

Commissioning

33

3 Commissioning

3.1 General instructions

Warning

The SensoLyt

®

690 pH armature must only be submersed

when connected to an electrode. When exchanging the

electrode make sure that no moisture penetrates the pH

armature.

When commissioning the armature, please observe:

l A plastic cap filled with KCI protects the top of the

electrode. It keeps the electrode active when it is stored

(or during longer measuring breaks).

When you want to measure you have to remove the cap.

l Observe the minimum immersion depth.

3.2 Commissioning

1 Screw off the protection hood.

Commissioning

34

2 Pull the stopper off the socket for the plug-in head.

3 Unscrew the protection cap from the electrode.

4 Screw the combined electrode into the socket.

Commissioning

35

5 Push the unit into the armature up to the stop.

6 Remove the watering cap for measuring.

7 Screw on the protection hood.

Commissioning

36

Maintenance and replacing the electrode

37

4 Maintenance and replacing the

electrode

Danger

Contact with the measuring solution can endanger the user!

Take protective measures suitable for the kind of measuring

solution (protective clothes, eye protectors etc.).

Warning

If the glass of the pH electrode is broken, the user is

endangered by the glass fragments!

Warning

For all maintenance work, disconnect the armature from the

instrument!

Note

Details on the maintenance of the combined electrode can

be found in the relevant operating manual.

If it is necessary to replace the electrode proceed as follows:

1 Screw off the protection hood.

Maintenance and replacing the electrode

38

2 Using the protection hood as a tool, lever out the

SensoLyt

®

690.

3 Carefully pull out the electrode until the screw joint is

visible.

4 Unscrew the combined electrode from the socket.

Maintenance and replacing the electrode

39

5 Screw on the new electrode.

6 Push the unit into the armature up to the stop.

7 Remove the watering cap for measuring.

Maintenance and replacing the electrode

40

8 Screw on the protection hood.

Spare parts and accessories

41

5 Spare parts and accessories

5.1 Combined electrodes

pH combined

electrodes

ORP combined

electrodes

5.2 General accessories

Protection hood

Technical buffer

solutions

1 Liter bottle content

Model Order no.

SensoLyt

®

SEA

SensoLyt

®

GDA

109 115

109 116

SensoLyt

®

PtA 109 125

SensoLyt 700 SK 109 194

TEP 4

TEP 7

TEP 10

pH 4.01

pH 7.00

pH 10.00

108 700

108 702

108 704

Spare parts and accessories

42

What to do if ...

43

6 What to do if ...

No temperature

displayed

Measuring does not

work

System cannot be

calibrated

Cause Remedy

– Defective temperature

sensor

– Send armature to WTW

– Armature not connected – Connect armature

– Incorrect instrument

setting

– Correct the instrument

setting

Cause Remedy

– The watering cap is still

on the electrode

– Pull of the watering cap,

calibrate

– No electrode connected – Connect the electrode,

check whether liquid has

penetrated;

if this is the case, send the

armature to WTW

– Armature not connected – Connect armature

– Incorrect instrument

setting

– Correct the instrument

setting

Cause Remedy

– Slope of the electrode

too low

– Replace the electrode

– Asymmetry too high – Replace the electrode

– An ORP electrode is

used in the armature

– Use a pH electrode

What to do if ...

44

Measured values are

not plausible

Cause Remedy

– No calibration performed – Calibration

– Armature not connected – Connect armature

– Electrode not connected

or defective

– Check electrode and

electrode connection

– Electrode contaminated – Clean electrode

– Liquid has penetrated

into the armature

– Armature defective; send

it to WTW

– Incorrect instrument

setting

– Correct the instrument

setting

Technical data

45

7 Technical data

7.1 General features

Output signal Voltage signal, proportional to the pH value, ORP

Temperature

measurement

via integrated NTC (30 k

Ω / 25 °C)

7.2 Measuring conditions

Temperature range 0 ... 60 °C

Max. admissible

overpressure

10 bar

Immersion depth min. 40 cm; max. 100 m depth

Connection

Operating position any

Fields of application Water and waste water monitoring

7-pin plug

Connection Armature - cable:

Cable - plug:

Plug - instrument

Electrode - armature

(when connected)

IP 68 (100 m)

IP 65

68 100

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