2.2.3.6 Electronic Enclosure Environment
Purge Monitoring
The PECM monitors the state of the purge condition for the analyzer. If a loss of purge is
detected the purge switch is enabled. The purge control alarm signal is controlled by the
SYSCON. The purge signal cable from SYSCON to PECM plugs into connector J1302 on the
PECM2. Connection SW1 on the PECM2 is used to connect atmospheric reference for the
purge switch.
When a purged enclosure is not required per the safety codes, connector J2 on the PECM2
can be used to disable the purge alarm. See the
PECM3 I/O Connections
diagram in
PECM
Overiew
for connector locations.
Atmospheric Pressure Monitoring (New for PECM-CTL3)
This sensor allows a Maxbasic program to measure the ambient atmospheric pressure for
custom applications. A tube must be connected from the sensor (J44 on the PECM-SSR board)
to the exterior of the EC.
L1 MMI LEDs
Maintenance Panel Level 1 consists of LEDs on the outside of the analyzer door. It is intended
for use in GCs that are not equipped with the full feature Maintenance Panel. The PECM
supplies the control signals for Maintenance Panel Level 1, if equipped. For PECM-1, the
Maintenance Panel Level 1 connects to position J17. See the
PECM3 I/O Connections
diagram in
PECM Overiew
for the location of connector J17.
Electronic Compartment Component Descriptions and Maintenance Procedures
2.2 Power Entry and Control Module
Maxum II Reference Manual
26 Manual, 7/2017, 2000596-001
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