Working With The Diagnostic Screen; Diagnostic Screen Overview - Bacharach HGM300 Installation & Operation Manual

SECTION 12

Working with the Diagnostic Screen

The Diagnostic Screen displays reference values for use by repair technicians. From the top level Zone
Screen press the SYSTEM key to go to the System Screen. Press the Diagnostic key to view the
reference values.

Diagnostic Screen Overview

The diagnostic screen contains sensor data and status information useful for trouble shooting various
fault conditions. An explanation of each line is given below along with normal operating ranges.
LINE 1: Detector Voltage – This is the peak-to-peak output of the IR sensor, in the absence of
refrigerant this value can range from 3.900V to 4.500V.
LINE 2: Average Detector Voltage – This is simply a running average of the values displayed
in line 1.
LINE 3: Zero Voltage – This is the IR sensor output that was stored during the last purge cycle and
has the same range as line 1.
LINE 4: Noise – This is a 16 point running average of the noise portion of IR bench output. This
reading is valuable mainly when refrigerant is NOT present.
LINE 5: Average Absorbency – This is the optical absorbency computed from the values in lines 2
and 3. In the absence of refrigerant the absorbency is 0.000AU. When sampling refrigerants, its
value varies proportionally with the refrigerant concentration.
LINE 6: uMoles/L – This is the absolute concentration in micro-moles per liter of refrigerant based
on line 4 and the internal calibration. There are two figures given. The first (which is annotated by a
B) is the actual measurement at the IR bench. The second is the calculated value corrected to
ambient conditions (temperature + pressure).
LINE 7: PPM – Parts Per Million is the volume concentration referenced to standard temperature
and pressure and is computed from lines 5, 8 and 13. There are two figures given. The first
(annotated by a B) is the actual PPM at the IR bench. The second is a PPM reading normalized to
standard temperature and pressure.
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Instruction 3015-4149