Honeywell Sensepoint XCD RFD Technical Manual

Sensepoint XCD RFD Technical Manual SPXCDHMRFENU Issue 1
71
19 Cross Interference and Cross Calibration
19.1 Cross Calibration Flammable Gas Detector
For greater accuracy, a catalytic gas detector should be calibrated using a certied
gas/air mixture equal to 50% LEL of the actual target gas intended to be monitored.
However, it is not always practical to obtain every detectable type of hydrocarbon gas in a
calibration-ready, certied and veriable form. Therefore, it is possible to carry out a “cross
calibration” using another hydrocarbon gas/air mixture.
When the Sensepoint XCD Combustible LEL sensor is to be calibrated with a gas which is
different to the gas or vapour to be detected, the following cross calibration procedure may
be followed:
Notes:
1. Table 14 lists a selection of hydrocarbon compounds and states a reference gure or
“Star Rating” according to the reaction they produce in relation to other hydrocarbons.
2. An eight star (8*) gas produces the highest output, while a one star (1*) gas produces
the lowest output.
No. Gas 705 705HT
1 Acetone 2* 4*
2 Ammonia 8* 7*
3 Benzene 2* 3*
4 Butanone 2* 4*
5 Butane 3* 4*
6 Butyl acetate 1* 1*
7 Butyl acrylate 4* 2*
8 Cyclohexane 2* 3*
9 Cyclohexanone 1* 1*
10 Diethyl ether 2* 4*
11 Ethane 4* 6*
12 Ethanol 3* 5*
13 Ethyl acetate 1* 3*
14 Ethylene 4* 6*
15 Heptane 1* 3*
16 Hexane 1* 4*
17 Hydrogen 6* 6*
18 Methane 6* 7*
19 Methanol 4* 5*
20 MIBK 1* 2*
21 Octane 1* 3*
22 Pentane 2* 4*
Caution: Where the user calibrates any sensor using a different gas, responsibility for
identifying and recording calibration rests with the user. Refer to the local regulations where
appropriate.

Honeywell Sensepoint XCD RFD Specifications

General

Brand	Honeywell
Model	Sensepoint XCD RFD
Category	Security Sensors
Language	English