Calibrating The Dosing Rate - ProMinent Hydro 2 Series Operating Instructions Manual

Repair
P_HY_0015_SW
Fig. 21
10.4

Calibrating the dosing rate

66
1. When changing the diaphragm, unscrew the diaphragm rupture
1
sensor from the dosing head.
2. Check that the monitor does not indicate a diaphragm rupture:
2
3. Using a blunt insulating probe (Ø 2 ... 3 mm, no sharp edges), press
into the channel of the diaphragm rupture sensor.
3
3a
ð The monitor device should indicate a diaphragm rupture.
4. Release the pin again.
4
ð The monitor device should no longer indicate a diaphragm rup‐
ture.
5
6
5. Repeat the test several times.
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 the separating diaphragm of the diaphragm rupture sensor
1. Disconnect the diaphragm rupture sensor from the monitor.
2. When changing the diaphragm, unscrew the diaphragm rupture
sensor from the dosing head.
3. Grasp the top part (2) of the diaphragm rupture sensor.
Do not tamper with the lacquer-protected nut.
4. Hold the body (5) in place with an open-ended spanner.
5. Unscrew the top of the diaphragm rupture sensor.
6. Clean any dirty parts.
7. Lay the new separating diaphragm (3) with the light side (PTFE)
down into the top part (2).
8. Place the disc (4) in the top part (2).
9. Place the spring into the body (5).
10. Move the body (5) close to the top part (2).
ð The spring (6) should sit correctly on the spring seat (3a).
11. Screw the body (5) into the top part and tighten.
12. Connect the diaphragm rupture sensor back to the monitor.
13. Check the diaphragm rupture sensor as described under "Checking
diaphragm rupture sensor".
14. If the diaphragm rupture sensor does not operate clearly and reli‐
ably, then definitively use a new diaphragm rupture sensor.
It is only worth calibrating the dosing rate if you wish to carry out particu‐
larly precise metering at a completely different back pressure.
The dosing rate of the hydraulic diaphragm metering pump is only
dependent upon back pressure to a minimal extent. And the pumps are
calibrated on the factory premises to the maximum operating pressure.
(Value of maximum operating pressure - see the pressure stage on the
indicating dial or the safety relief valve.)