User Manual - PolyXeta
®
2 Detector with HL Sensor
for Refrigerant Gases - May_2020
Page
18
PolyXeta
is a registered trademark of MSR
Made in Germany
GAPX2_Freon_E_2020_05_18
Phone: +49 8531 9004-0 Fax: +49 8531 9004-54
Specification subject to change without notice
MSR-Electronic GmbH, Buergermeister-Schoenbauer-Str. 13, D 94060 Pocking
www.msr-electronic.de
8
Maintenance and Service
It is obligatory to perform maintenance regularly in order to maintain safety, measuring and warning
functions of the PX2 gas detector. The maintenance includes visual, functional and system inspections and
must only be carried out by appropriately qualified personnel.
When carrying out maintenance and repair work according to the user manual, only use original spare parts
from MSR-Electronic. Repairs or changes of the PX2 warning devices not complying with the maintenance
manual or carried out by unauthorized persons can affect proper equipment and safety features and always
result in a termination of the manufacturer's warranty and certificate.
The opening of the gas warning device results in the cancellation of the explosion protection. In the case of
calibration, the general instructions in chapter 4.1 must be strictly followed.
8.1
Visual Inspection
A trained person may carry out the visual inspection which includes at least the following activities:
-
- Check the PX2 gas detector including the gas inlet for mechanical damage.
-
- Check the gas inlet of the measuring head for dust, dirt and moisture deposits.
-
- Check the locking screw of the cover if placed firmly and correctly.
-
- Check the operational and status messages of the gas warning devices with displays.
-
Operation indication: green LED = ON
-
Alarm indication:
red LED =
OFF (no alarm
-
Fault indication:
yellow LED = OFF (no fault)
Keep a report about the visual inspection, containing the identification of the gas detector, any defects
found and measures taken as well as the date and the name of the person responsible for the visual
inspection.
8.2
Functional Control / Calibration and Adjustment
Only a qualified technician must perform the functional tests containing at least the following activities:
Applying the test gas causes the adjustment of the current signal at the analog output
and the triggering of the alarm relay. Connected actuators are put on alert.
-
Visual inspection according to chapter 8.1
-
Check zero-point
1
:
o
Apply zero gas. If the measured value on the display or - for versions without display - on
the service tool is outside the permissible range
2
, you have to perform the zero calibration.
-
Check sensor sensitivity
1
:
o
Apply test gas. If the measured value on the display or - for versions without display - on the
service tool is outside the permissible range
2
, you have to perform the gain calibration.
-
Check response time:
o
Apply test gas. Check the reaction time until the alarm is triggered. If the response time is
longer than specified in the table Sensor Specification in the column "Response Time", the
sensor head must be replaced.
1
For warning devices without display, the analog output can alternatively be used for the control of the measured values. The
determination of the current signal in relation to the test gas concentration used must be according to the formula [1]. If the
measured value (current signal) is outside the permissible range
2
, calibration is required.
2
See Table 10
.1 “
Max. Ambient Conditions"
