Bamo BAMOPHOX 194, Инструкция по эксплуатации, Страница: 14 / 19

Page 14
194 M1 01 F 12-13-2013
Example
With process configuration:
- Set point: 1.5 ppm
- High dead zone: 0.4 ppm between 1.5 and 1.9 ppm
- Low dead zone : 0.1 ppm between 1.4 and 1.5 ppm
- High BANDWIDTH: 3.5 ppm (that is a limit of 5 ppm for the maximum)
- Low BANDWIDTH: 0.5 ppm (that is a limit of 1 ppm for the minimum)
- Over the highest limit (>5 ppm), S2 is “ON” for a continuous injection (contact S2 is closed)
- Under the lowest limit (<1 ppm), S1 is “ON” for a continuous injection (contact S1 is closed)
- Inside the dead zone (between 1.4 & 1.9 ppm), S1 and S2 are “OFF”, no injection at all (contacts S1 and S2 are opened)
- If the measurement value is between the dead zone and the highest limit (between 1.9 & 5 ppm)
or between the dead zone and the lowest limit (between 1.0 & 1.4 ppm), the contact S1 or S2 are “ON” only for a time
proportional to the step between measurement and desired value.
CAUTION:
The minimum closing time of a relay is 1 second.
If the measurement M=1.42 and if the cycle time is 10 seconds,
the closing contact time is:
Closing contact time /S1=
Low proportional BANDWIDTH
Cycle time x (measure - set point)
10 x (1.5-1.42)
0,4
= 2 sec