FLAMMABLE GAS SENSOR/TRANSMITTER
A T E X
M1
GROUP I & II
INTRINSICALLY
SAFE
8 CALIBRATION
continued
8.4
Calibrate SPAN
Apply test gas, at a flow rate of 0.2 to 1 l/min, until the display
value stabilises.
The Gas Sensing Module will automatically return to
the NORMAL measuring mode if NO pushbuttons are
operated within 50 seconds.
Press CALIBRATE SPAN until the indicator is flashing YELLOW
(3 times).
Press and hold the calibration pushbuttons to SCROLL the
display value UP/DOWN until it concurs with the value of gas
concentration marked on the test gas canister.
Switch off the test gas supply.
5 seconds after SCROLLING has ceased the gas sensing module
will automatically return to the NORMAL measuring mode.
TEST GAS
Y
Y
R
G
R
Re-apply the test gas for a few seconds to verify the response of
the sensor.
DO NOT PRESS CALIBRATE SPAN UNTIL THE DISPLAYED
VALUE HAS FULLY STABILISED.
The CALIBRATE SPAN will NOT function if the level of
gas
concentration
detected
by
the
sensing
element is less than about 25% FULL SCALE.
The indicator will NOT flash YELLOW.
Release and the indicator will show RED to denote READY.
R
The Gas Sensing Module will automatically return to
the NORMAL measuring mode if NO pushbuttons are
operated within 60 seconds.
18/28
INSTALLATION & OPERATING DATA
TT X
X 66 33 88 33
ISSUE S 01/15
