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H25-IR Operation
Instruction 3015-4342 35
4.3 What to Do when a Fault Occurs
When the instrument’s diagnostics detects that a fault has occurred, the word “FAULT” appears in place of
the Gas Type, and an audible beep occurs every 2 seconds.
The cause of the fault can be determined by viewing the Diagnostic menu’s Last Fault function. To display
the Diagnostics menu, first press both the ENT and ESC buttons on either the instrument’s front panel or
Smart probe at the same time to display the Main menu. Next, use the Up and Down buttons to highlight
“DIAGNOSTICS” and then press ENT to display the Diagnostics menu.
Main Menu:
SYSTEM
LOG
SETUPS
CAL DATA
DIAGNOSTICS
FACTORY
Select “LAST FAULT” to display the Last Fault screen. Refer to Section
5.1.2 Last Fault for a listing of the
type of faults that are tracked by the diagnostics, and for information on how to possibly correct the fault.
Once the cause of the fault has been corrected, the FAULT message and the audible beep are
automatically turned OFF.
4.4 What is PCHK?
The instrument maintains its accuracy under varying atmospheric conditions by performing an
atmospheric pressure check either once every hour, or immediately after calibration (refer to Section
Error! Reference source not found. Error! Reference source not found.). When a PCHK is
performed, the unit beeps once, the pump stops, a valve opens exposing the pressure sensor to the
atmosphere, and “PCHK” appears at the bottom-right of the display. During this time the instrument
measures the current atmospheric pressure, and then uses this value along with the current temperature
and the ideal gas law to compute the gas level. When the pressure check is complete (approximately 5
seconds), the unit beeps, the valve closes, and the pump restarts.
4.5 RS-232 Communication
The RS-232 connector located on the rear of the instrument (refer to Section 1.7.2 Rear View) is used to
flash the instrument’s memory. Refer to Section
5.3 Flashing Memory.
Oz/yr
R134A
SETUP
PCHK
Pressure check being performed
Diagnostics Menu:
SENSOR DATA
LAST FAULT
IR EMITTER
PRESSURE
Fault has occurred
Oz/yr
FAULT
SETUP
SM SRCH