j)
Press the POWER/SELECT button to initiate the sensor test.
k)
Press the PEAKS/NO button to bypass the sensor test.
l)
The LCD will display the message “WAITING FOR GAS” and will show the
gas concentrations that are expected for methane (EX), carbon monoxide
(CO), and hydrogen sulfide (HS) sensors.
m)
An internal timer starts that allows time to connect the certified calibration gas
hose.
n)
Place the calibration hood over the sensors.
o)
Secure it tightly with the retaining screw.
p)
Attach a hose from the correct calibration gas bottle to the gas inlet of the
detector.
q)
Turn on the valve and ensure the gas flow rate is between 0.2 and 0.5 liters per
minute.
r)
The LCD will then change to “TESTING.”
s)
The sensor test will typically take 30 seconds. If values are outside the
expected range the LCD will read “FULL TEST.” This testing will take up to
3 minutes.
t)
A full test or calibration can be invoked by leaving the gas applied on the
sensors for at least 30 seconds after the conclusion of the test.
u)
If the test was successful the LCD will read “TEST PASSED” or “FULL
TEST PASSED” at the end of the test.
v)
Turn the gas valve to off and disconnect the hose.
w)
If the test was successful the detector is ready for use.
x)
If the test was unsuccessful the LCD will read “SENSOR TEST FAILED.”
y)
It is recommended the test be repeated at this point.
z)
If the detector does not pass the second test,
do not use the instrument until
the reason for the message has been determined and corrected.
