Sierra Monitor Corporation 2400-01, Инструкция по эксплуатации

Страница: 9 / 21

Instruction Manual
Page: 7 Model 2400 Vault Gas Monitor 2/03
increase above the TP5 value
and the gas alarm occurs.
5.5
If 5000 ppm methane gas is
available perform step 4 test
using the calibration. Note
that the change in voltage is
much less dramatic.
5.6
It should now be clear that
TP6 should be adjusted above
"0" to avoid false "sensor fail"
alarms and sufficiently below
TP5 so that the change due to
calibration gas causes TP6 to
go higher than TP5 and sets
off the alarm.
5.7
It is not necessary to repeat the
exercise on the CO side of the
system but the same actions
occur. Usually the voltage at
TP3 is adjusted closer to the
reference voltage than TP6
because the CO sensitivity is
100 ppm for the 2400-01
(compared to 5000 ppm
methane). For the Model
2400-21 the CO sensitivity is
25 ppm.
5.8
Return the TP6 voltage to the
level recorded in step 5.2
above or re-calibrate using the
correct concentration of gas.