Dräger PIR 7000 Technical Handbook page 34

Accessories
Example for the dependance of the
concentration display of methane test gas in
the range 0 to 25 % vol.:
— Dräger Safety recommends a test gas
flow of 0.5 to 1.0 l/min.
NOTICE
After using flowcell with test gas, the
system must be purged carefully using
compressed air or nitrogen. Residual test
gas in the flowcell or in the feed hoses may
cause zero-point deviations over longer
periods.
Conversion factors for Dräger models PIR 7000 / Dräger PIR 7200:
Dräger PIR 7000
type 334
Dräger PIR 7000
type 340
Dräger PIR 7200
34
Methane Propane
4.2 4.2
4.4 3.7
– – – – – –
5,0
4,5
4,0
3,5
3,0
2,5
2,0
1,5
1,0
0,5
0,0
0 10
concentration of the calibration gas
[% methane by vol.]
Ethylene
3.3
– – –
– – –
100
80
60
40
20
0
20
Carbon dioxide
– – –
– – –
3.8