ControlMaster CM15 and CMF160
Universal process indicator
1
/8 DIN 7 Advanced Level
IM/CM/I–EN Rev. P 59
Frequency Mode
Example:
Eng Hi = 6000 l/m. Frequency input fullscale (Electrical High) = 500 Hz.
Totalizer required to increment in m
3
.
Volume unit conversion: 1 l = 0.001 m
3
.
Source time units = minutes, count rate units = seconds.
Time unit conversion: 1 min = 60 s
If the input source is at a fixed rate of 6000 l/min (500 Hz) the totalizer increments at 0.0002 m
3
/s.
If the input source is reduced to a fixed rate of 3000 l/min (250 Hz), the totalizer increments at:
Count Rate =
Eng Hi (of source) x volume unit conversion x pulse duration
time unit conversion
Pulse Duration =
1
Analog input 1 Electrical High (Hz)
Count Rate =
6000 x 0.001 x 0.002
= 0.0002 m
3
/s
60
3000
x 0.0002 = 0.0001 m
3
6000
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