Specifications

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 (AUDALRM page 16). An optional external alarm device can be connected to the fault relay to alert
personnel that a system fault has occurred (Page 10). Pressing the front panel SILENCE button will
acknowledge the fault and turn OFF all alarm indicators with the exception of the front panel SYSTEM FAULT
light. The alarm circuit will reactivate, however, if the fault condition is not cleared within the time period set by
the SILENCE function (Page 16). 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 the HGM-SZ is 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 steadily 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 measuring for refrigerant gas. In the example screens shown
above, the monitor is currently detecting 0 ppm of R-134A (refrigerant 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 fresh (zero)
air that is being drawn in through the Purge Air Inlet Port. This purging process is performed on an “as needed”
basis, which is normally once every 6 to 8 minutes.
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
VERSION x.xx
WARM UP
M
EASURE 00485pk
0
pp
m R134A
P
U
R
GE 00485pk
0
pp
m R134A
P
RES CHK 00485pk
0
pp
m R134A