Sensepoint XCD RFD Technical Manual SPXCDHMRFENU Issue 1
73
1. Since catalytic sensors require oxygen for correct operation, a mixture of gas in air
should always be used for calibration purposes.
2. Assuming average performance of the sensor, the sensitivity information in Tables 14
To 16 is normally accurate to + or - 30%.
Working Example:
If the target gas to be detected is 0-100%LEL Ethylene and the only calibration gas
available to re-calibrate the sensor is Methane (at 50% LEL concentration), the procedure
is as follows:
(1) Look up the star rating for each gas in Table 14:
Gas No. 14, Ethylene = 5*
Gas No. 18, Methane = 6*
(2) Then, look up the span settings for a 50% LEL calibration gas in Table 15 by selecting
the row of gures next to the 6* in the “calibration gas” column. Select the gure in the 5*
column of the “gas to be detected” section. The gure is 62.
(3) This means that during re-calibration, the span gas setting on the gas detector
transmitter or controller should be set to 62% LEL to give an accurate measuring scale for
0-100%LEL Ethylene, when using 50% LEL Methane as the calibration gas.
Section 19.1 is used for Sensepoint XCD Catalytic Sensor only, RFD with 705 and 705HT.
Please contact your local Honeywell Analytics sales or service distributor, or regional offce
should further clarication or additional information be required.
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