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F-1500 Turbine Flow Meter Manual 02/18 - 1018-6 / 35726
Page 27
2.6.3 Frequency Output Connections
The frequency output is used for a remote counter. It can be scaled to output a 1 to 10 kHz
signal proportional to mass or volume flow, temperature, pressure or density.
The frequency output requires a separate 5 to 36 VDC power supply; however, there are
current and power specifications that must be observed. The output can conduct a current
up to 40 mA and can dissipate up to 200 mW. The output is isolated from the meter
electronics and power supply.
There are three connection options for the frequency output. The first has a separate power
supply (Figure 36). The second uses the flow meter power supply (Figure 37) (DC powered
units only), and the third uses the internal 24 VDC power supply (Figure 38)(AC powered
units only). Use the first option with a separate power supply (5 to 36 VDC) if a specific
voltage is needed for the frequency output. Use the second configuration if the voltage at the
flow meter power supply is an acceptable driver voltage for the load connected. (Take into
account that the current used by the frequency load comes from the meter’s power supply).
Use the third configuration if you have an AC powered unit only. In any case, the voltage of
the frequency output is the same as the voltage supplied to the circuit.
AC or DC powered meters
Freq Out +
Freq Out -
Freq. Out voltage = +V
Select resistor so that current
through Freq. Out
≤
40 mA.
PWR
PWR
DC Powered meters only
Freq. Out voltage = + Power voltage for meter
Freq. Out +
Freq. Out -
R current limit ~10K
+
24 VDC Out
- 24 VDC Out
AC units only
Meter provided DC Power
Freq
.
Out +
Freq
.
Out -
Freq. Out voltage = + Power voltage for meter
R current limit ~10K
Figure 24. Isolated Frequency Output Using External Power Supply
Figure 25. Non-Isolated Frequency Output Using Input Power Supply
Figure 26. Isolated Frequency Output Using Meter Provided Power Supply
DC powered meters only
AC units only
Meter provided DC power