Calibrating The Unit - Dräger Polytron 7000 Instructions For Use Manual

Maintenance

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 ac-
tually calibrated since this is not necessary for these sensors.
— For critical applications, the calibration intervals should be defined in ac-
cordance with the recommendations in EN 50073
tional regulations.
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 67.

— Calibration menu, page 58 to page 59.
— Zero gas and test gas: see the information in the sensor data sheet and on
the pages 118 to 121.
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.
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
measurement of toxic gases and vapours – Part 4: Guidelines for selection, installa-
tion, use and maintenance.
44
1)
, EN45544-4
CAUTION
2)
and na-
Polytron
OK
1