26
Calibrating the Gas Sensors: The individual gas sensors can be calibrated using the appropriate
calibration gas. This applies to all gases except Oxygen. For details of how to carry out a full calibra-
tion see page 24.
It is necessary to have information on the individual calibration gases i.e. type and concentrations.
This information has to be entered to perform an accurate calibration of the sensors. It is recom-
mended that a zero calibration i.e.a recalibrate function, is performed immediately prior to perform-
ing a gas span calibration.
3.7
DRAFT READING
The Draft Reading indicates the internal stack pressure in water gauge column inches of water in the
column or hPa. The figure represents a differential pressure between the stack pressure at the probe
tip and the ambient pressure. It enables the flow rate of the chimney/stack to be determined. For
details of how to perform a calibration of the draft sensor refer to Section 6.6, Calibrating the Draft
Sensor.
EXIT
F1
F2
F3
F4
HELP
CAL
PRESS ’CAL’ TO CALIBRATE
DRAFT X.XXX wgc
EXIT
F1
F2
F3
F4
HELP
PRESS ’ENTER’ WHEN READY TO CAL.IBRATE
CAL GAS XXXX ppm.
CONNECT CAL GAS AND USE CURSOR KEYS TO SELECT THE CAL
GAS ONCENTRATION.
EXIT
F1
F2
F3
F4
HELP
CONNECT ZERO GAS...
PRESS "ENTER" WHEN READY TO CALIBRATE
EXIT
F1
F2
F3
F4
HELP
GASES
DRAFT XXX wgc
