1. Shut down the iH system (refer to Section 5.10) and allow it to cool.
2. Remove the right-hand side enclosure panel from the iH system: refer to Section 3.4.
3. Refer to Figure 1-1. Remove the HCMB oil filler-plug (2).
4. Use a suitable pump or syringe to suck the oil out of the pump.
5. Dispose of the old 'O' ring on the oil filler-plug (2) and replace it with a new 'O' ring (available
as a spare: refer to Section 8.3).
6. Fill the pump through the filler hole with the correct grade and quantity of oil. Allow the oil
to drain into the pump, then check the oil-level on the sight-glass: refer to Section 6.7.
7. Ensure that the new 'O' ring is correctly positioned on the oil filler-plug (2), then refit the
filler-plug to the HCMB pump.
8. Refit the right-hand side enclosure panel: refer to Section 3.17.
6.11 Zero the gas module flow transducer
Note: The flow transducer is zeroed by the software in the control system; you do not need to physically
adjust any part of the iH system.
The accuracy of the mass flow transducer in the Gas Module may drift slightly and we
recommend that it is 'zeroed' (that is, calibrated for zero gas flow) once a year.
You must zero the transducer with the electrical supply on, the iH system switched off and
your nitrogen supply off and disconnected from the iH system. This ensures that the
transducer is correctly zeroed when there is no nitrogen flow (if you zero the transducer with
the nitrogen supply connected, small nitrogen leaks through the solenoid-valves could affect
the calibration).
Use the Setup/Service/Zero Sensors menu to start to zero the transducer, then use the Status
menu to display the gas flows; the gas flow displayed will be zero when the transducer has
been correctly zeroed. Note that it will take approximately 15 minutes to zero the transducer;
if required, you can use the Status/Zero time menu to view the time remaining before the
transducer is zeroed.
6.12 Adjust the pump display terminal display viewing angle
If the display (Figure 1-8, item 2) is difficult to see, use the following procedure to adjust the
display viewing angle.
1. Refer to Figure 3-6. Remove the Pump Display Terminal (8) from the recess (5) in the
dashboard.
2. Place or hold the Pump Display Terminal in its normal operating orientation.
3. Turn the display adjuster (9) clockwise or anticlockwise until the display is easy to read.
4. Refit the Pump Display Terminal (8) in the recess (5) in the dashboard.
5. If necessary, repeat Steps 1 to 4 until the display is easy to see.
iH Dry Pumping Systems 6-13
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