ControlMaster CM30 and CM50
Universal process controllers,
1
/4 and
1
/2 DIN 7 Advanced Level
52 IM/CM/ED–EN Rev. B
Frequency Mode
Example 1:
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
Example 2 – Frequency to pulse conversion:
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:
Pulse Mode
For example:
Pulse / Unit = 50, Pulse Units = l, Totalizer required to increment in m
3
.
Volume unit conversion: 1 l = 0.001 m
3
.
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
60
= 0.0002 m
3
/s
3000
6000
x 0.0002 = 0.0001 m
3
.
Count Rate =
Volume unit conversion
Pulse / Unit
Count Rate =
0.001
50
= 0.00002 m
3
/pulse
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