38
The Sensor ZERO Function
Zero and calibration functions should only be undertaken by trained competent
personnel. The effectiveness of a gas detection system is largely down to how well it is
maintained and this means how well it is calibrated.
Regulator to deliver a fixed flowrate (0.5-1 L/min)
Oliver IGD P/N 5022001
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.
ZERO
GAS
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-
+
-
Apply zero gas to the detector.
It is important that the detector zero point is correctly set. It must be considered that there
is the possibility that the gas to be detected is already present in the area of the detector.
For this reason never zero on just the ambient surroundings.
Use a suitable ZERO gas as follows.
Zero gas should have a humidity between 0-90%RH
GAS RECOMMENDED ZERO GAS
O2/CO2 NITROGEN
PELLISTOR INSTRUMENT GRADE AIR
TOXIC GASES INSTRUMENT GRADE AIR
The following diagram shows a typical equipment set up.
Recommended Test 750 series Gas Applicators.
Tocsin 102 Series Detector P/N 401101A
MK3 Gas Detector P/N 401101A
MK5 & MK6 Gas Detector P/N 401101E
TOC-750 Series P/N
IMPORTANT: Flow gas for a minimum of 60 Seconds. Some detectors with longer response
times may take longer to stabilise.
