Specifications

20 Instruction 3015-4256
Clearing the Stored PPM Log, Alarm & Fault Data
Up to 200 gas measurements, and 30 alarm and fault events are stored by the monitor.
To clear stored data, first display the data to be cleared by using the PPM LOG, ALARMS or FAULTS function
(Page 15). Next, press the Right Arrow Keypad and ENTER buttons at the same time. A single, long tone
should be heard when the data has been successfully cleared.
Reset to Factory Default Settings
IMPORTANT! Performing this function will delete all program parameters, alarms, faults, and ppm log files.
With AC power removed from the monitor, press and hold down the Factory Default Switch (Page 8). Apply AC
power and listen for a beep and then a long tone. Release switch. At this time the monitor will purge the IR
bench and auto set the IR detector voltage to its baseline 0 ppm value.
After warming up, reprogram the HGM-SZ to the desired settings as needed.
Factory Default Settings
Parameter Factory Default
Gas Type R-134a
Leak Alarm 100 ppm
Spill Alarm
300 ppm
Evacuate Alarm 500 ppm
Log Interval 10 minutes
4–20 mA Factor 0.016 mA/ppm
Squelch 00.0 ppm
Zone Temperature 25°C
Calibration Factor 1.000
The P-CHK Function
Overview
The P-CHK function (Pressure Check Function) (Page 17) is useful to a service technician for troubleshooting a
flow fault problem. The monitor will trigger a flow fault if the pressure drop from ambient is less than 0.02 psi
during a purge cycle, and 0.06 psi during a measurement cycle.
Keypad Functions
From the Data Display screen, use the Keypad buttons to place the arrow (>) on the display next to the P-CHK
function. Then press ENTER to display the Pressure screen.
The Left Arrow Keypad button toggles the purge valve open and closed. Note that an asterisk (∗) appears
when the purge valve is open (purging).
The Down Arrow Keypad button toggles the pump ON and OFF.
Pressing the ENTER button stores the current manifold pressure shown on the left to the ambient pressure
shown on the right (must be done with the pump OFF).