User Manual - PolyXeta
®
2 Detector with HL Sensor
for Refrigerant Gases - May_2020
Page
15
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
In case of overrange, the gas warning device adopts the special mode until acknowledgment with the
following states:
-
Alarm relay message: Relay in alarm status (if assigned)
-
Fault signal relay:
Relay in the error status
-
Analog output:
> 21.2 mA
-
Indication on display: Overrange / status LED red
-
Field bus:
Overrange
When a very high gas concentration has occurred, the sensitivity and zero point of the sensor head may be
different even days later. Therefore in this case, you have to check the zero point and the sensitivity of the
sensor immediately after the event as well as a few days later and, if necessary, to recalibrate them.
6.2.1
Alarm Acknowledgement
The acknowledgement of the function "Latching" requires that after the alarm has been triggered, the gas-
free state has to be ensured with additional measures (for example, portable handset that has already been
turned on outside the danger zone). Only after having ascertained that there is no more gas present, you are
allowed to reset the pending alarm only locally on the device having released the alarm by manually
pressing (5 sec.) the internal button (fig. 4.1) or by activating the "ESCAPE" button on the optional display or
the external service tool. The reset may also be made on the optional remote control unit.
6.3
Special Mode
The operator may set the instrument in the special mode only when gas-free state is ensured
(no alarm), because the alarm function is not available in this mode.
The special mode includes all operating conditions outside the measuring operation.
In special mode operation the query of the gas concentrations is slightly delayed, but there is no alarm
evaluation. The fault relay switches to error status and the analog output delivers 2 mA. The flashing yellow
LED and the optional display indicate the special mode.
The PX2 gas detector takes the special mode in the following cases:
•
Internal device fault
•
Measurement signal exceeds or falls below limit < 6 % > of reading signal
•
Diagnostic and warming-up phase after the return of voltage (Power On Status)
•
Service mode activated by the operator.
The operator can activate the special mode on the internal (optional) display or via an external service tool
or the PC software EasyConfig. This mode includes commissioning, calibration, inspection, repair and
decommissioning.
Pending alarms are held in active special mode, but new alarms are not generated.
The operator can exit the special mode after completion of work; if there are no further entries or operations,
the unit will automatically return to the measurement mode after 15 minutes.
