User Guide | Gas detecting sensor, type PAGM for CO2 and Halocarbon
© Danfoss | DCS (vt) | 2021.03
8 | BC372016561395en-000101
Second diagnostic screen
Screen item
Description
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 abscene of the gas the absorbency is 0.00000 au.
When sampling gas, its value varies proportionally with the gas concentration
µMoles/Liter
This is the absolute concentration in micro-moles per liter of gas.
Detector Voltage
This is a running average of the IR detector’s sensor voltage.
Purge Valve Asterisk (*) The purge valve can be opened and closed by pressing the
Keypad Left
button
. An
asterisk appears on the display when the purge valve is open causing the monitor to
draw air from its purge-air port.
Carbon filter maintenance intervals
Approximate ambient refrigerant
Level
Filter replacement interval
0 ppm
6 months
5 ppm
250 hrs
10 ppm
200 hrs
20 ppm
150 hrs
100 ppm
100 hrs
The Refrigerant Monitor requires periodic maintenance to ensure peak performance and accuracy
including replacement of internal and external filters and calibration accuracy check refer to the
manual for reference.
External Coalescing Inline Filter and Internal Hydrophobic Filters replacement filter replacement
should be carried out at least once every 6 months but is dependent on the environment and usage.
If used in harsh environment where a large amount of dust and moisture particles are present in
atmospheres the maintenance intervals need to be shortened.
The intervals for the Purge/Fresh Air Carbon filter might very and is related to time the equipment is
used and ppm it was exposed to see table below.
When servicing the parts inside the Refrigerant Monitor, disassemble the monitor’s metal chassis as
follows:
Items Required:
Medium Phillips head screwdriver
Disassemble procedure:
1. Remove monitor and its battery pack from the soft carrying case.
2. Unplug battery pack from monitor.
3. Remove a total of 10 screws from the locations shown in the illustrations below.
4. Carefully separate the metal chassis.
5. Locate filters shown in the illustrations below – red circle
6. Pull off tubing from both ends of filter and remove filter from instrument.
7. Attach tubing to new filter. Ensure correct orientation of the filter – the flow direction is
highlighted with an arrow or/and green label.
8. Reassemble monitor.
Replace the following components using Danfoss Maintenance Kit –
LP-DHGM-MM
a. Coalescing inline Filter Element (Qty. 1)
b. Purge/Fresh Air Carbon Filter (Qty. 1)
c. Hydrophobic Filters (Qty. 2)
Note:
Individual components not sold separately
After periodic maintenance the unit can experience faults <0200>, <2000>, <8000> please contact
Danfoss technical support department for further assistance how to adjust the unit settings.
5. Maintenance
5.1 Replacing filters
5.2
Replacing Internal
Hydrophobic Filters
a.
b.
c.
