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Repair
12.2
Checking diaphragm rupture sensor
P_HY_0015_SW
Fig. 23
42
3.
Insert metering diaphragm (25) in backplate (3) and screw on
2 threads.
4.
For the following steps, see the next chapter.
WARNING!
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1.
When changing the diaphragm, unscrew the diaphragm rup‐
1
ture sensor from the dosing head.
2.
Check that the monitor does not indicate a diaphragm rup‐
2
ture:
3.
Using a blunt insulating probe (Ø 2 ... 3 mm, no sharp
3
3a
edges), press into the channel of the diaphragm rupture
sensor.
ð The monitor device must indicate a diaphragm rupture.
4
5
4.
Release the pin again.
6
ð The monitor must no longer indicate a diaphragm rup‐
ture.
5.
Repeat the test several times.
6.
If everything is working correctly, screw the diaphragm rup‐
ture sensor into the dosing head with a new seal (1).
7.
If not, go to the next section.
Turn metering diaphragm (25) until the 4
holes of diaphragm (25) and backplate (3)
are precisely aligned. The leakage hole (26)
of backplate (3) must face downwards.
Disconnect the diaphragm rupture sensor from
the monitor.
Protect yourself from the feed chemical if using
hazardous or unknown feed chemicals.
After a diaphragm rupture, there will be feed
chemical in the diaphragm rupture sensor and
feed channel in the backplate (3).
The diaphragm rupture sensor must be
checked after every diaphragm rupture and the
separating diaphragm replaced if necessary
(e.g. if the feed chemical has crystallised or dirt
and particles are being pumped as well).
When screwing the diaphragm rupture sensor
in or out, ensure that the cable does not
become too twisted.
Connect the monitor to check for electrical con‐
tinuity.
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