Servomex DF-310E, Руководство оператора

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Connecting to External Devices DF-310E 57
Procedure for setting pressure and flow through the enclosure:
1. Verify proper operation of the Z-Purge unit as described in this section, while the
environment is in a safe condition.
2. Remove the four cover screws on the Z-Purge pressure switch.
3. Check that the pressure calibration screw on the pressure switch is backed out as far as
possible to the minimum pressure setting of 0.15 inches of water. Check the enclosure
pressure with a suitable instrument if possible.
4. Close the Z-Purge pressure regulator (fully counter clock-wise)
5. Fully open the Z-Purge flowmeter needle valve. (fully clock-wise)
6. Open the instrument air/N2 supply to the Z-Purge regulator. (pre-regulated to the
minimum pressure required to supply 50 scfh of flow to the enclosure).
7. Open the Z-Purge regulator sufficiently to allow 50 scfh to the enclosure.
8. Verify that the alarm pressure switch has been deactivated (is not in an alarm condition).
9. Purge the enclosure for 15 minutes at 50 scfh.
10. Reduce the purge flow rate to a minimum of 5 to 10 scfh using the flowmeter needle
valve, making certain that the alarm pressure switch remains deactivated (not in an alarm
condition). If the purge switch activates, confirm that the enclosure is “tight” and increase
the flow rate as necessary.
11. The analyzer may now be turned on.