Appendices Manual CWD 2005
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106 Manual CWD2005.doc
11.8. Fast loop
The CWD 2005 itself has a high-speed response time but the installed response
speed depends on the volume of the process connections with regulators and filters.
To calculate the volume of the tube with the volume of filters and regulators, see
Chap. 3.3.
- trument. The tee-piece outlet
allows 80 % of the gas to flow past the instrument to a lower pressure area and 20%
of the total gas volume is sampled by the instrument with a 1:4 improvement in
response time. The flow meter control valve (customer supplied) allows the customer
to adjust the by-pass ratio.
Figure 29: Fast loop schematic
1. Gauge inlet pressure 2. Filter
3. Pressure regulator 4. Gauge instrument inlet
5. Fast loop outlet pressure 6. Flow controller
11.9. Air Consumption (Option)
It is possible to measure air consumption with a calculation model or with an
additional measurement of CO with an integrated IR Card.
11.9.1. Calculated Air Consumption
The air consumption can be determined with a correlative formula with the variables
of specific gravity and heating value. The dimension is Nm
3
air pro Nm
3
process gas.
The air consumption can be displayed on the screen and an output of 4-20 mA is
available.
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