Riken Keiki RS-400 Series, Руководство по эксплуатации

Страница: 29 / 46

4 How to Tube 4-1. Recommended external tubing system
- 27 -
4
How to Tube
4-1. Recommended external tubing system
If the sampling point is on a high-pressure line over 0.9 MPa, decompression must be performed outside
the sampling device. Decompression must be performed as close to the sampling point as possible to
ensure the quickest possible arrival of the measuring gas at the OHC-800. (Use the direct-insertion type of
pressure reducing valve if possible.)
Since the OHC-800 consumes approximately 300 mL/min of measuring gas, which is small, the bypass
flow rate must be increased to ensure quicker arrival of the gas.
If there is a low-pressure line of about 20 kPa, BYPASS OUT can be connected. If there is no low-pressure
line, release the gas from BYPASS OUT into the atmosphere.
Since there is no limit on the arrival time of the reference gas, there is no problem unless the pressure
exceeds 0.9 MPa.
The gas from GAS OUT should be released into the atmosphere in principle, but it can be exhaust into an
exhaust duct equivalent to the atmospheric pressure (atmospheric pressure ±3 kPa) if any.
If RELIEF OUT converges on GAS OUT, use tubing with inner diameter of 10 mm or more (3/8" or more) if
the length of the tube is 20 m or shorter in order to decrease the load from the converging point to
downstream.
The end point of a vent for atmosphere release should form an inverted "T" shape to prevent inflow of
rainwater or variations of exhaust pressure due to wind inflow.