XT Series Personal Gas Detector
15
12. Optional Span Calibration (CO AND H
2
S Versions Only)
While the XT requires no calibration for its lifetime of 24 months there may be an occasion when
it is deemed necessary to carry out a calibration, for instance, if a self-test fails. To carry out the
span calibration the user requires the following additional equipment which can be purchased
from Honeywell Analytics.
Gas cylinder containing a known concentration calibration gas as follows:•
Toxic Gas Calibration Concentration
H
2
S 25 ppm in air
CO 100 ppm in air
A gas regulator supplying the gas at 300ml/min flow rate•
Tubing for use between the regulator and the test adaptor (supplied)•
Carry out the zero calibration procedure as described in Section 11. Only if the zero calibration
is successful can a span calibration be performed. At the end of the zero calibration procedure,
the test button must be pressed continuously for 5 seconds while the ( ) symbol is still flashing.
Connect the gas cylinder and test adaptor and apply the gas at 300 ml/min. The instrument will
display a ‘C’ (for calibration), and count down from ‘60’ to ’0’.
If the span calibration is successful the unit will give 2 beeps, 2 flashes and displays the Test Pass
icon ( ). If it fails the instrument gives a long beep, long flash and displays the Fail icon ( ) (the
calibration remains as it was before the span calibration was attempted).
Span Calibration - Pass Span Calibration – Fail
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