Specifications

Halogen Gas Monitor – MultiZone Remote Display
Instruction 3015-5157 44
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.
LINE 8: Zero Temperature – This line contains the sensor and enclosure temperature measured and
stored during the last purge cycle in degrees C.
LINE 9: Bench Temperature – This is the current IR sensor temperature in degrees C as well as the
raw voltage coming from the temperature sensor itself. This value can range from ambient to ambient
+15 degrees C.
LINE 10: Box Temperature – This is the current internal enclosure temperature along with the raw
voltage from the temperature sensor, and has the same range as line 9.
LINE 11: Pressure – This is the current absolute manifold pressure in PSIA along with the output
voltage of the pressure sensor. This value should always be 0.2 to 1.0 PSIA below ambient (line 13).
LINE 12: Vacuum – The vacuum pressure is measured every purge cycle by closing all sample
valves. Its value is typically 2.5 to 4.0 PSIA below ambient (line 13).
LINE 13: Ambient – Ambient pressure is measured every purge cycle with the sample pump off and
the manifold open. Its value is weather and altitude dependent and can range from 10.0 to 15.5 PSIA.