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14 Instruction 3015-4256
If a system fault occurs (see Fault Code list on Page 19), the monitor responds by turning ON the front
panel SYSTEM FAULT (yellow) light and energizing the fault relay. If the internal audible alarm is
turned ON, it too will activate. An optional external alarm device can be connected to the fault relay to
alert personnel that a system fault has occurred. The SYSTEM FAULT light will turn OFF only after the
cause of the fault has been eliminated.
A log of the alarm and fault events can be viewed using the monitor’s ALARMS and FAULTS function
(Page 15).
Display Screens
Initial Power Up
When first powered up all front panel lights are turned ON, and a splash screen appears showing the
monitor’s firmware revision level. After a brief moment the Warm Up screen is display along with the
front panel MONITOR ON light (green) blinking.
The monitor takes 15 minutes to warm up; after which, the MONITOR ON light glows steady and the
Data Display screen is displayed.
Data Display Screen
During normal operation, the Data Display screen shows when the monitor is performing the following
three functions:
MEASURE indicates that the monitor is actively monitoring for refrigerant gas. In the example screens
shown above, the monitor is currently detecting 0 ppm of R-134a gas, and that a peak measurement of
485 ppm has occurred.
To reset the peak value to zero, press the ENTER button.
PURGE is displayed when the monitor is resetting its infrared detector to a baseline of 0 ppm using
ambient air as the gas sample. This purging process is performed on an “as needed” basis, which is
normally once every 6 to 8 minutes.
Note that a charcoal filter (Page 8) is present in the purge-air stream to filter out any refrigerant gas that
would otherwise cause the baseline level to be something other than 0 ppm.
PRES CHK is displayed when the monitor is performing an atmospheric pressure check, which is done to
ensure the accuracy of the gas measurement under varying atmospheric conditions. This pressure check is
performed every 30 minutes.
BACHARACH INC
H
GMSZ REV 1.0
WARM UP
M
EASURE 00485pk
0
pp
m R134A
P
URGE 00485pk
0
pp
m R134A
P
R
ES CHK 00485pk
0
pp
m R134A