Humidistat Purge Exhaust - Process Technology LUFRAN Instruction

Maintenance Procedures (Continued):
M5:
Humidistat Purge Exhaust, Humidistat Switch
There is one humidistat device mounted on each heating column. These items are
responsible for monitoring the purge gas exhaust for the presence of moisture. These
humidistat devices must be inspected every 6 months.
Procedure M5-1: Humidistat Inspection Procedure:
The inspection part of this procedure must be repeated for each heating column.
Inspect the purge gas exhaust tubing:
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) Open the rear cabinet door.
3) Locate the humidistat device(s) mounted on each heating column.
4) Locate the ¼-inch tubing connected between the top of the heating column and the
humidistat. The outlet of the purge column is labeled EXHAUST.
M-43-01
Revision - Date: 08 – 04/06/15
This will also prevent the heaters from
Figure 45: Purge Gas Control
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Lufran Single Outlet Manual