11
(2) In case of pressurized sample gas
(3) In case of aspirator suction
•
It is also possible to apply air aspirator unit to sample the gas by utilizing
instrumentation air. In this method, pressure to the sensor must be kept as
small as possible and make it to -26hPa at a maximum.
As the load to oxygen sensor is high on this method, aspirator suction method
shall be used only when the pump cannot be used.
•
If the sample gas pressure would fluctuate, use the constant flow rate control
valve to keep the constant flow rate.
•
Exhaust the sampled gas to open air in principle. When make piping to exhaust
side necessarily, choose the piping diameter to keep the pressure loss due to the
length of piping within 13hPa.
Dust filter
Detection
point
GD-F4A-1
Gas OUT
1.0
±
0.3 L/min
Flow control valve
Flow meter
CAUTION
！
Detection
point
GD-F4A-1
Instrumentation air
Air consumption
：
1
〜
3NL/min
Pressure
：
0.1
〜
0.34MPa
Dust filter
Flow control
valve
Aspirator
Flow meter
