39
The Sensor CALIBRATE Function
Calibration gas.
Note: the concentration marked
on the label. Ensure it is of the
correct type for the detector being
calibrated. The concentration
should typically be 50 to 90% of
the detector range.
Calibration gas should have a humidity between 0-90%RH
Refer to EN 600179-20-1 for gas concentration guidance.
Regulator to deliver a fixed flowrate
(0.5-1 L/min)
Hose delivers cal gas to the detector. Note a test
gas applicator is usually required. In some cases
weather protection guards or the detector itself
may include a gas applicator port.
CAL GAS
50% LEL
Cal Gas Adaptor
Ensure it is correctly
fitted
ZERO
F
AUL
T
CAL
360
CHASS
24V DC
B
A
GND
mA
P
Y
W
mA+
360
CONC
0V
mA-
Calibration is a similar process to the ZERO command and also requires a suitable calibration
gas.
Note that with calibration there is more to consider than with Zeroing. The type and age of the
detector can have an influence so it is recommended that periodically as well as calibrating the
detectors that there response is checked in the diagnostic menu. In this manner over a period of
years detector deterioration can be checked for preventative replacement. For full details refer to
the IGD 750 Series detector manual.
Select to move between
channels. Tap on the channel
number to type in the channel
number if known.
Flow calibration gas and observe the
reading. Once stable select the CAL
button. The option now appears to
enter the calibration gas value. This
will normally be written on the
calibration gas bottle label. The
calibration command is then sent to
the detector head. Observe the
calibrated reading in the following
screen to ensure a successful
calibration (typ/-2% of Range).
48.3
Relative response to Methane @ 4.4%
Vol = 100% LEL
Equivalent to 55% LEL N-Butane
