Digital Outputs - GF PF220 V2 Betriebsanleitung

Operating Instructions
Converting measured current to flow rate
Assume the maximum flow rate is Fmax (l/min) and the minimum flow rate Fmin is '0' (l/min), as shown below.
F
max
F
min
To calculate the flow rate (l/min) for a measured current (mA) then:
Current range
0 – 20 mA
0 – 16 mA
4 – 20 mA
9.2

Digital outputs

The three digital outputs can each be set up to operate in one of three modes:
• Current Range: 4-20mA
• Pulse Output (set to Normally Open or Normally Closed contact types)
• Alarm Output (set to trigger on Rising or Falling conditions)
• Frequency Output (with High Frequency and Low Frequency settings)
• The measurement source can be:
• Volume (not compatible with Frequency Output)
• Flow (not compatible with Pulse Output)
• Energy (not compatible with Frequency Output)
• Power (not compatible with Pulse Output)
• Signal (not compatible with Pulse Output)
There are no limitations on the combinations of these modes and their assignment to each of the three outputs. For example, the
digital outputs could be configured as three alarms attached to the same flow reading with different trigger points, or perhaps two
alarms – one attached to Volume and one attached to Power – and one frequency output connected to flow.
4 8
Flow rate fromula
Flow rate=I x ((F_max- F_min))/20 + F_min
Flow rate=I x ((F_max- F_min))/16 + F_min
Flow rate=(I-4) x ((F_max- F_min))/16 + F_min
12 16
[0-16mA-scale]
[0-20mA-scale]
[4-20mA-scale]
I (mA)
20
Outputs
43