Adjusting The Zero-Point - Dräger Polytron 7000 Instructions For Use Manual

● Connect hoses. Integrate flowmeter with hose distributor.
Using a test gas ampoule
Test gas ampoules are only used for the sensitivity adjustment for the target gas.
Equipment:
– calibration flask (order no. 68 03 407)
– adapter (order no. 68 04 620)
– Test gas ampoule
– hose, type appropriate to the gas properties (e.g. FKM hose order
no. 12 07 068)
1. Plug the adapter onto the calibration flask.
2. Connect hoses.
6.3

Adjusting the zero-point

Prerequisite:
– The warm-up phase of the sensor is completed (see section 5.5).
– Test gas supply is prepared (see section 6.2).
Zero adjustment can be aborted at any time. To abort during calibration, select
Previous.
If no entries are made, the gas detector automatically switches over to measuring
mode after 15 minutes.
Procedure, using an EC-H
1. Select Calibration > Zero calibration > EC-H
 The 4-20 mA interface issues the maintenance signal.
2. Supply zero gas or fresh air, respectively:
OK
+
OK
68 04 620
+
Dräger Polytron 7000
68 07 407
S sensor as an example
2
Calibration
S.
2