MPD Operating Manual
22
7.2 Cross Calibration procedure for MPD-CB1
CAUTION
Where the user calibrates any sensor using a different gas, responsibility for
identifying and recording calibration rests with the user. Refer to local regulations
where appropriate.
When the MPD-CB1 Combustible LEL sensor is to be calibrated with a gas which
is different to the gas or vapor to be detected, the following cross calibration
procedure should be followed:
NOTe
• Table 1 lists the gases according to the reaction they produce at a given
detector.
• An eight star (8*) gas produces the highest output, while a one star (1*)
gas produces the lowest output. (These are not applicable at ppm levels.)
Gas Star Rating Gas Star Rating
Acetone 4* Hexane 3*
Ammonia 7* Hydrogen 6*
Benzene 3* Methane 6*
Butanone 3* Methanol 5*
Butane 4* Nonane 2*
Butyl acetate 1* MIBK 3*
Butyl acrylate 1* Octane 3*
Cyclohexane 3* Pentane 4*
Cyclohexanone 1* Propane 5*
Diethyl ether 4* Propan-2-ol 4*
Ethane 6* Styrene 2*
Ethanol 5* Tetra hydrafuran 4*
Ethyl acetate 3* Toluene 3*
Ethylene 5* Triethylamine 3*
Heptane 3* Xylene 2*
Table 1. Star Rating of Gases
To cross calibrate the MPD-CB1 combustible gas sensor:
1. Obtain the star rating for both the test gas and the gas to be detected
from Table 1.
2. Set the gas selection to the star rating which is the same star rating of the
gas being detected.
3. These values may then be used in Table 2 to obtain the required meter
setting when a 50% LEL test gas is applied to the detector.
NOTe
These settings must only be used with a calibration gas concentration of
50% LEL.
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