Honeywell Sensepoint XCD RFD Technical Handbook page 74

Sensepoint XCD RFD Technical Manual
To cross calibrate the Sensepoint XCD flammable 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
Calibration Gas
8*
7*
6*
5*
4*
3*
2*
1*
Note: These settings must only be used with a calibration gas concentration of 50% LEL.
(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
detect
8*
7*
6*
5*
4*
3*
2*
1*
22 Pentane
23 Propane
24 Propan-2-ol
25 Styrene
26 Tetra hydrafuran
27 Toluene
28 Triethylamine
29 Xylene
Table 14 . Star Rating of Gases
8* 7*
50 62
40 50
33 41
26 33
- 26
- -
- -
- -
Table 15. Calibration span setting
8* 7*
1.00 1.24 1.52 1.89 2.37 2.98 3.78
0.81 1.00 1.23 1.53 1.92 2.40 3.05
0.66 0.81 1.00 1.24 1.56 1.96 2.49
0.53 0.66 0.80 1.00 1.25 1.58 2.00
0.42 0.52 0.54 0.80 1.00 1.26 1.60
0.34 0.42 0.51 0.64 0.80 1.00 1.27
0.26 0.33 0.40 0.50 0.63 0.79 1.00
0.21 0.26 0.32 0.39 0.49 0.62 0.78
Table 16. Correction factors
*Rating of Gas to be Detected
6* 5* 4*
76 95 -
61 76 -
50 62 78
40 50 63
32 40 50
26 32 40
- 25 31
- - 25
Sensor used to detect
6* 5* 4*
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3*
5*
4*
2*
4*
3*
3*
2*
3* 2* 1*
- - -
- - -
- - -
79 - -
63 80 -
50 64 81
39 50 64
31 39 50
3* 2* 1*
4.83
3.90
3.17
2.55
2.03
1.62
1.28
1.00