Riken Keiki OHC-800, Руководство по эксплуатации

Страница: 31 / 88

3 How to Install Calorimeter 3-4. How to tube
31 / 87
3-4-2. 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 regulator 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
Φ 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.
If there is any potential risk of drain or dust inflow, install a trap or filter to prevent inflow of those foreign
substances.
Only during
maintenance
Reference gas
Low-pressure
line
0.02 MPa or less
0.9 MPa Max
the inner diameter
must be 10 mm or
longer.
If the length is 20 m or shorter,
High-pressure line