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10.2
Repair the diaphragm rupture sensor
30 V version
Fig. 20
WARNING!
Warning of feed chemical
After diaphragm rupture, additional feed chemical will be
present in the diaphragm rupture sensor and the inlet
channel in the dosing head!
–
Check diaphragm rupture sensor
1.
When changing the diaphragm, unscrew the diaphragm rupture
1
sensor from the dosing head.
2.
Check for electrical continuity:
2
3.
Using a blunt insulating probe (Ø 2 ... 3 mm, no sharp edges), press
into the channel of the diaphragm rupture sensor.
3
ð Check that there is no electrical continuity
4.
Release the pin again.
4
ð Electrical continuity must be re-established.
5.
Repeat the test several times.
5
6.
If everything is working correctly, screw the diaphragm rupture
sensor into the dosing head with a new seal (1).
7.
If not, go to the next section.
Replace separating diaphragm of the diaphragm rupture sensor
1.
Disconnect the diaphragm rupture sensor from the power supply.
2.
When changing the diaphragm, unscrew the diaphragm rupture
sensor from the dosing head.
3.
Grasp the upper section (2) of the diaphragm rupture sensor.
4.
Hold the body (5) in place with an open-ended spanner.
5.
Unscrew the top of the diaphragm rupture sensor.
6.
Clean the soiled parts.
7.
Lay the new separating diaphragm (3) with the light side (PTFE)
down into the upper section (2).
8.
Lay the plate (4) with the uneven side down into the upper section
(2).
9.
Screw the body (5) into the upper section and screw tighten.
10.
Check the diaphragm rupture sensor as described in "Check dia‐
phragm rupture sensor".
If using hazardous or unknown feed chemicals then pro‐
tect yourself against the metering chemical accordingly.
Observe the safety data sheet.
Repairs
49
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