Frequency Output - Siemens SITRANS FC430 Operating Instructions Manual

Pulse repetition
Pulse repetition is calculated as follows:
Note
Pulse width must be selected with the view that remaining time is always greater than pulse
width at the highest measured flow.
Example
● Pulse output configuration (channels 2 to 4)
– Operation Mode = Pulse Output
– Process Value = Massflow
– Amount Per Pulse = 1 kg
– Pulse Width = 1 ms
● Measured massflow value = 10 kg/s (constant)
Result:
● Pulse repetition = 100 ms
● Output frequency = 10 pulses per second with a pulse width of 1 ms
● Remaining time between pulses is 99 ms
8.6.3

Frequency output

The frequency output function supplies a frequency (50% duty cycle) proportional to the
selected process value.
Frequency is calculated as follows:
Example
This example shows how to calculate the output frequency for any measured flowrate:
Frequency output configuration:
● Operation Mode = Frequency Output (Channel 2 to 4)
● Process Value = Massflow
FC430 with HART
Operating Instructions, 05/2015, A5E03361511-AF
Functions
8.6 Inputs and outputs
145