Purge Gas Flow Switch N 2 M4 - Process Technology LUFRAN Instruction

Maintenance Procedures (Continued):
M4:
Purge Gas Flow Switch
There is one purge gas flow switch for the entire unit. It must be inspected every 6
months.
Procedure M4-1: Purge Gas Flow Switch Inspection Procedure:
1) If the unit is in LOCAL mode, press the DISABLE HEATER button on the command
panel of the OIP. If the unit is in REMOTE mode disable the heater from the
customer supplied remote controller.
energizing.
2) Shut off purge gas flow. The unit will enter an alarm condition. The red light on the
top of the unit will illuminate and the ALARMS MENU on the touchscreen display will
appear. The N2 Purge alarm will flash on the display.
3) Restart purge gas flow. Verify that the purge gas supply pressure is regulated
between 1.75 – 6.9 bar (25 – 100 psig).
4) Press the FAULT RESET button on the command panel of the touch screen display
to clear the fault condition.
If the unit fails to generate an alarm or fails to reset, the switch must be replaced.
There is no calibration procedure for this part.
Procedure M4-2: Purge Gas Flow Switch Replacement Procedure:
1) Press the DISABLE HEATER button on the OIP to allow the unit to cool to ambient
inlet temperature. This will also prevent the heaters from engaging.
2) Turn OFF Power to the unit.
3) Turn off the purge gas supply to the unit.
M-43-01
Revision - Date: 08 – 04/06/15
This will also prevent the heaters from
Verify that the electrical supply is shut off, and
any necessary lockout/tagout devices are
properly installed.
Verify that the purge gas supply is shut off, and
any necessary lockout/tagout devices are
properly installed.
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Lufran Single Outlet Manual