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Instruction 3015-4256 21
Working with the DIAGNOS Function
Overview
The DIAGNOS function displays sensor data and status information useful to a service technician for
troubleshooting various fault conditions. Explanations of the data shown in these screens are given below.
Keypad Functions
From the Data Display screen, use the Keypad buttons to place the arrow (>) on the display next to the
DIAGNOS function. Then press ENTER to display the first of two Diagnostic screens.
Press the Up Arrow Keypad button to toggle between the First and Second Diagnostic screen.
First Diagnostic Screen
PPM Level – Parts Per Million Level is the current detected gas level, and is the volume concentration
referenced to standard temperature and pressure.
Average Absorption Unit – This is the optical absorbency. In the absence of refrigerant the absorbency
is 0.00000 au. When sampling refrigerants, its value varies proportionally with the refrigerant
concentration.
µMoles/Liter – This is the absolute concentration in micro-moles per liter of refrigerant.
Detector Voltage – This is a running average of the IR detector’s bench voltage as displayed in the
second Diagnostic screen.
Purge Valve Asterisk (∗) – When viewing the diagnostic screen, the purge valve can be opened and
closed by pressing the Left Arrow Keypad button. An asterisk appears on the display when the purge
valve is open.
Second Diagnostic Screen
In the second diagnostic screen, toggle between displaying the Bench Voltage and the Noise value, and the
Detector Temperature and Box Temperature by pressing the Right Arrow Keypad button.
Bench Voltage – This is the current peak-to-peak output of the IR detector. In the absence of refrigerant
this value can range from 3.90000V to 4.50000V.
Noise –The Noise value is a 16 point running average of the noise portion of the IR detector’s output. This
reading is valuable mainly when refrigerant is NOT present.
Detector Temperature – This is the current detector temperature in °C.
Box Temperature – This is the current internal enclosure temperature in °C.
Fault Code – Current fault code. A value of <0000> indicates that no faults are being detected.
Pressure Reading – This is the pressure as measured every purge cycle with the sample pump off and
the gas-sample inlet open. Its value is weather and altitude dependent and can range from 10.0 to
15.5 PSIA.
Purge Valve Asterisk (∗) – When viewing the diagnostic screen, the purge valve can be opened and
closed by pressing the Left Arrow Keypad button. An asterisk appears on the display when the purge
valve is open.
4.265
0
0v <0000>
24.5cD* 14.00
p
si
0.4ppm 0.00
0
.00002au*4.260v
Bench Voltage Fault Code
Detector Temperature °C ∗ Pressure Reading
PPM Level µMole/Liter
Avg. Absorption Unit ∗ Detector Voltage
0
.00250n <0000>
29.5cB* 14.00
p
si
Noise Fault Code
Box Temperature °C ∗ Pressure Reading