Metrohm NIRS XDS Process Analyzer – SingleFiber - Manual (Page 16)

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2.3 Display / Interface Module
The Display Interface Module is located on the Electronic Power Control Unit (EPCU). Status of
power-up may be monitored using this display.
The Display/Interface Module gives information
about the purge control. Each LED indicates
status of a specific function.
The four LED indicators at the bottom are:
• HEP: High Enclosure Pressure
• SDT: Shutdown Delay Timer
• RET: Rapid Exchange Timer
• SEP: Safe Enclosure Pressure
• Green LED signals indicate normal
power conditions
• Blue LED signals indicate normal air
pressure and flow conditions
• Yellow LED signal on the Rapid Exchange
Timer indicates the timer is underway
• Red LED signals indicate unsafe operating
conditions, and instrument power is de-
activated
Information about the Vent System:
The vent system is located on top of the instrument enclosure.
To operate with the purge system, the XDS Process Analytics
Instrument must be installed in an upright position, with the
vent in the position shown.
This vent must be tested before power-up. A blunt object, at
least 6” (153mm) long should be inserted up the tube, from
inside the enclosure, to verify that the flapper is not seized. The
eraser end of a pencil works quite well.
The vent system is designed to maintain positive pressure inside
the XDS Process Analytics Instrument. The vent contains a
flapper valve, shown at right.