Technical Data
PrimaX
44
GB
6.6 PrimaX P List of Combustible Gases and Vapours detectable with
Catalytic Sensor Part No. 10112716
Relative response factors of tested gases with reference to Propane
For the gases or vapours shown in the tables of this chapter the response curves
have been tested according to EN 60079-29-1:2007. If the LEL of a substance was
not listed in EN 60079-20-1:2010, the LEL has been taken from the Chemsafe data
base (Dechema, Frankfurt). Due to legal requirements other locally used LEL val-
ues might be mandatory.
It is highly recommended that the gas detector is exposed to clean air when cali-
brating the zero and a mixture of the target gas in air with a concentration of approx-
imately 50% LEL.
If calibration with the target gas is not possible a reference calibration can be per-
formed with 0.85 % (v/v) Propane C
3
H
8
in air and using the relative response data
given in the table of this chapter. These values are only valid for new sensors and,
unless otherwise stated, they refer to an ambient temperature of 20°C. If using a
reference gas to calibrate the gas detector the displayed values may vary by up to
+/- 20% from the target gas concentration.
Reference calibration example for 50% Methanol:
(1) Relative response factor for Methanol from table = 0.62
(2) Propane calibration gas concentration being used
C
3
H
8
= 0.89 Vol%
(3) Propane volume concentration for 100% LEL = 1.7 Vol%
(4) Propane calibration gas concentration in % LEL
= 0.89 Vol% C
3
H
8
x
100% LEL
1.7 Vol% C
3
H
8
= 52.4% LEL
(5) Gas detector span setting = 52.4% LEL x 0.62 = 32.5% LEL
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