Maintenance
42
Calibrating the unit
— Ensure that the sensor is warmed up before it is calibrated. See the sensor data
sheet for the warming-up time.
— For some sensors (such as oxygen sensors) the function » zero-point calibration «
is simply a test of the sensor function. The zero point is not actually calibrated
since this is not necessary for these sensors.
— For critical applications, the calibration intervals should be defined in accord-
ance with the recommendations in EN 50073
1)
, EN45544-4
2)
and national reg-
ulations.
Note the calibration sequence!
● First check the zero point and calibrate it if necessary, immediately after this,
check the sensitivity and adjust it as necessary.
— Never calibrate the sensitivity before calibrating the zero point.
— Calibration cannot be carried out if the date and time are not set.
● Setting the date and the time, page 65.
— Calibration menu, page 56 to page 57
— Zero gas and test gas: see the information in the sensor data sheet and on the
pages 105 to 108.
Calibrating with test gas
● Use a test-gas cylinder with pressure-reduction valve (a stainless-steel pressure
reduction valve for aggressive gases). Observe the information in the sensor
data sheet.
1 Mount a calibration adapter Part No. 68 06 978 (with two hose connectors) on
the Polytron 7000.
● Vent the test gas leaving the adapter into a fume cupboard or into the open air
(with a hose connected to the second connector on the calibration adapter).
1)
EN 50073 – Guidelines for selection, installation, use and maintenance of devices for the
detection and measurement of flammable gases and oxygen.
2)
EN 45544-4 – Electrical devices for the direct detection and direct concentration measure-
ment of toxic gases and vapours – Part 4: Guidelines for selection, installation, use and
maintenance.
Caution:
Test gas must not be inhaled. Risk to health! Care must be taken about the
risks which can arise when using test gas; hazard instructions and safety advice
must be observed.
For details, see appropriate DIN Safety Data Sheets.
04823758_1.eps
1
Polytron
OK
To Next Page
Loading...
