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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
© Weilheim 2000, WTW GmbH& Co. KG
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
IP 65
68 100
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