Onicon F-2600 Manuel d'utilisateur télécharger pdf (Page 44)

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F-2600 & F-2700 Vortex Flow Meter Manual 02/15 - 0808-7 / 19204 Page 44

DC powered meters only

> 250 Ohm

DC Power

DC Common

mA Meter

For HART

communications

the signal loop

must have a

minimum of 250

ohms load

resistance.

AC units only

Meter Provided DC

Power

> 250 Ohm

24 VDC

For HART

communications

the signal loop

must have a

minimum of 250

ohms load

resistance.

mA Meter

Figure 32. Non-Isolated 4–20 mA Output Using Meter Input Power Supply

Figure 33. Isolated 4–20 mA Output Using Meter Provided Power Supply

2.7.3 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 ow, temperature, pressure or density.

The frequency output requires a separate 5 to 36 VDC power supply; however, there are

current and power specications 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 rst has a separate power

supply (Figure 36). The second uses the ow 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 rst option with a separate power supply (5 to 36 VDC)

if a specic voltage is needed for the frequency output. Use the second conguration if

the voltage at the ow 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 conguration 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.

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Onicon F-2600 Manuel d'utilisateur Page 44

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