Honeywell Sensepoint XCD RFD - Page 74

Sensepoint XCD RFD Technical Manual SPXCDHMRFEN Issue 4_08-2016
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22 Pentane 3*
23 Propane 5*
24 Propan-2-ol 4*
25 Styrene 2*
26 Tetra hydrafuran 4*
27 Toluene 3*
28 Triethylamine 3*
29 Xylene 2*
Table 14 . Star Rating of Gases
To cross calibrate the Sensepoint XCD ammable gas detector:
(1) Obtain the star rating for both the calibration test gas and the gas to be detected from
Table 14
(2) These values may then be used in Table 15 to obtain the required calibration span
setting when a 50% LEL test gas is applied to the detector.
*Rating of *Rating of Gas to be Detected
Calibration Gas 8* 7* 6* 5* 4* 3* 2* 1*
8* 50 62 76 95 - - - -
7* 40 50 61 76 - - - -
6* 33 41 50 62 78 - - -
5* 26 33 40 50 63 79 - -
4* - 26 32 40 50 63 80 -
3* - - 26 32 40 50 64 81
2* - - - 25 31 39 50 64
1* - - - - 25 31 39 50
Note: These settings must only be used with a calibration gas concentration of 50% LEL.
Table 15. Calibration span setting
(3) If a sensor is to be used to detect a gas other than that for which it was calibrated and
there is no intention to use an equivalent calibration gas to re-calibrate the sensor, then
the required correction factor may be obtained from Table 16.
The reading shown on the gas detector controller or transmitter display should be
multiplied by this number in order to obtain a more accurate gas concentration result.
Sensor calibrated to Sensor used to detect
detect 8* 7* 6* 5* 4* 3* 2* 1*
8* 1.00 1.24 1.52 1.89 2.37 2.98 3.78 4.83
7* 0.81 1.00 1.23 1.53 1.92 2.40 3.05 3.90
6* 0.66 0.81 1.00 1.24 1.56 1.96 2.49 3.17
5* 0.53 0.66 0.80 1.00 1.25 1.58 2.00 2.55
4* 0.42 0.52 0.54 0.80 1.00 1.26 1.60 2.03
3* 0.34 0.42 0.51 0.64 0.80 1.00 1.27 1.62
2* 0.26 0.33 0.40 0.50 0.63 0.79 1.00 1.28
1* 0.21 0.26 0.32 0.39 0.49 0.62 0.78 1.00
Table 16. Correction factors