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13.2.3 Adjusting / setting the quantity of sample water
•
Set the quantity of sample water with the adjustment spindle
(Q1) so that a small amount of water runs through the
ascending pipe (S) in the housing cylinder (T).
•
When using a water sensor (O, optional): In order for the water
sensor (O) to work, the float body (N) must be at the height of
the water sensor (O).
Measuring cell with floater stopper (default upon
delivery): If the sample water flow rate is set too
high or is increased temporarily, no alarm is
triggered, and the control output remains active!
Caution
If the sample water flow rate is set too high or is
increased temporarily, there is a risk that the
sample water will overflow at the overflow
mechanism. In this state, no alarm is triggered,
and the control output remains active!
Measuring cell without floater stopper (see
section 12.3.1 Removing the floater stopper):
If the sample water flow rate is too high, the float
body (N) will move outside of the detection range
of the water sensor (O). In this state, an alarm is
Caution
triggered via the connected measuring amplifier,
and the control output is switched off, if
necessary. The flow rate is set correctly if the
float body (N) is at the height of the water
sensor (O).
By increasing the sample water flow rate, the
Note
delay time of the flow armature can be reduced.
13.3 Switching off
To avoid a dosing error, the device controlled (for
instance a gas dosing unit or dosing pump) must
be switched off each time the measuring system
Caution
is switched off. Observe the installation and
operating instructions of the measuring amplifier
and device controlled!
13.3.1 Short-term stop (up to one week)
1. Close and/or switch off the device controlled (for instance a
gas dosing unit or dosing pump).
2. Wait until the display of the measuring amplifier is at zero.
3. Switch off the measuring amplifier.
4. Close the connection to the sample water inlet (U1) and
outlet (U2).
To protect the electrodes, do not drain the water!
Make sure that the water level in the flow fitting F
Caution
is sufficiently high for the reference electrode B1
to be immersed at least 2 cm during device stop.
20
13.3.2 Long-term stop
1. Close and/or switch off the device controlled (for instance a
gas dosing unit or dosing pump).
2. Wait until the display of the measuring amplifier is at zero.
3. Switch off the electricity supply to the measuring amplifier.
4. Close the connection to the sample water inlet (U1) and
outlet (U2).
5. Open the bleeding spindle (L) and deaeration spindle (J), and
drain water.
6. Remove the reference electrode (B1), fit thread protective
caps, and clean the electrode.
7. Remove the pH (A1) and redox single-rod measuring chains
(A2), if necessary. Fit thread protective caps, and clean the
electrodes.
8. Fit protective caps on the electrodes. The protective caps
must be filled with 3-molar potassium chloride solution.
Observe the installation and operating
Caution
instructions of the electrodes!
9. Store electrodes with protective caps in a dry place. If they are
stored for an extended period of time, add a 3-molar
potassium chloride solution, if necessary.
10.Carefully unscrew the screwed part (H), and empty it of water,
if any.
Carefully remove the screwed part (H)!
The cleaning wing (X) and inlet chamber (W) are
Caution
loose on the measuring electrode (D) and may fall
out!
11.Before starting up again, and if it is very dirty, clean the whole
flow armature (F). See section 14. Maintenance .
13.4 Switching on again
Observe the installation and operating
instructions of the measuring amplifier and
Caution
device controlled (for instance a gas dosing unit
or dosing pump)!
13.4.1 After short-term stop
Note
Fill the measuring cell with water.
1. Open the connection to the sample water outlet (U2).
2. Open the connection to the sample water inlet (U1).
3. Check the quantity of sample water.
4. Switch on the measuring amplifier.
Let the system run for at least two hours to avoid
Caution
faulty measurements and calibrations!
5. Take a photometrical measurement.
6. Recalibrate, if necessary. See section 12.8 Calibrating the
.
parameters Cl
, ClO
, O
2
2
3
7. Switch on the device controlled (for instance a gas dosing unit
or dosing pump), if necessary.
13.4.2 After long-term stop / inspection
If the measuring cell has been switched off for a long period of
time or has been emptied, for instance for inspection, is it
necessary to start up the measuring cell as if it was the first
start-up. See section 12.6 Checks prior to start-up and
12.7 Switching on .
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