10
４−８．Cautions at piping works
４−9．Example of piping connection
Gas inlet/outlet fitting of this unit is Rc 1/8 female screw and provided with brass coupling.
Applicable piping is φ8(O.D.)-1t copper pipe. Secure the piping connections not to leak.
The piping material will be changed depending on corrosive gas contained in a sampled gas. In
such case, contact RIKEN KEIKI Co., Ltd.
(1) In case of pump suction
・
This unit is designed to sample the gas in an atmospheric pressure. Do not give an excessive
pressure to gas inlet and outlet of this unit.
・
Connect the exhaust pipe to the gas outlet located at the bottom of this unit and exhaust
the sampled gas to an area known to be non-hazardous.
WARNING
・
Use Φ8(O.D)-1t copper pipe and so on for piping.
・
Carry out piping works as straight as possible.
Excessively high load may cause burden on the suction pump, shortening the effective life of
the pump.
When bends the pipe, secure R (radius of curvature) enough to avoid loading to the piping.
・
Determine the suction side piping length while considering the response time. When the
gas is sampled from the piping end (gas detection point), the response time of the gas
detection sensor delay time caused by the piping length becomes equivalent to the
detector response time.
・
Be sure to attach the gas suction port at the end of gas detection point.
・
Be sure to put dust filter in front of gas detector. If sampled gas contains water and
corrosive gases, removal device is required separately.
CAUTION
！
Detection
point
GD-F4A-1
Gas OUT
1.0
±
0.3L/min
Dust filter
Pump
Flow control
valve
P
Flow meter
