User Manual - PolyGard
®
2 / µGard
®
2
Sensors for Toxic Gases and Oxygen
Page
8
PolyGard
/ µGard
®
are registered trademarks of MSR
GA_SC2_MC2_Tox_D_0618
Phone 0049(0)8531/9004-0
Fax: 0049(0)8531/9004-54
Specification subject to change without notice
MSR-Electronic GmbH, Würdinger Str. 27, D 94060 Pocking www:msr-electronic.de
Printed in Germany
Apply a defined gas concentration on the sensor element with the help of the gas generator and check the
measurement signal at the analog output or at the relay outputs.
With this test, the complete function chain “Sensor Element > Sensor Cartridge> Local Bus> BSB> Field Bus>
GC Controller” is tested.
6 Inspection and Service
Inspection, service and calibration of the sensor should be done by trained technicians at regular intervals. We
therefore recommend concluding a service contract with MSR or one of their authorized partners.
According to EN 45544-4, inspection and service have to be executed at regular intervals. The maximum
intervals have to be determined and respected by the person responsible for the gas warning system according
to the legal requirements. MSR-E recommends employing the common inspection and service intervals as
specified in the general regulations of the gas measuring technique. We recommend an inspection interval of 3
months. The recommended calibration intervals depend on the sensor element and can be read from the table
“Calibration”. If there are different intervals, always observe the shortest one.
Inspections and services must be documented. The date for the next maintenance has to be affixed to the
sensor.
6.1 Inspection
Gas sensors should be controlled regularly by a competent person according to EN 45544-4. The following has
to be checked in particular:
Maintenance/ calibration interval not exceeded.
Visual inspection of the sensor including cable for damage etc.
Remove dust deposits, especially at the gas inlet.
The filter at the gas inlet has to be replaced if extremely dirty.
6.2 Service and Calibration
When performing the maintenance you have to do the calibration and the functional test, see chapter 5, in
addition to the inspection.
A fixed calibration interval is stored for each sensor type.
SC2 Sensor heads:
If this interval is exceeded, a digital maintenance message is generated and forwarded.
Performing the calibration automatically deletes this message.
MC2 Sensor heads:
If this interval is exceeded, the current output of the MC2 goes to a fixed 19 mA signal. For new devices
(factory calibration), the interval may be exceeded by a factor of 1.5.
After voltage recovery, there is a defined interruption of this message. This can be of use in order to employ the
device without the maintenance message for a few days (adjustable in system parameters -> error time, value
range> 1) until the calibration is repeated.
Performing the calibration automatically deletes this message.
