GE PanaFlow MV80, Руководство пользователя

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PanaFlow™ MV80 & MV82 User’s Manual 35
Chapter 2. Installation
2.5.4 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 (see Figure 24 or Figure 25 below). In addition,
there are current and power specifications that must be observed. The output can conduct a current up to 40 mA and it
can dissipate up to 200 mW of power. The output is isolated from the meter electronics and power supply.
Figure 24: Isolated Frequency Output Using External Power Supply
Figure 25: Non-Isolated Frequency Output Using External Power Supply
2.5.5 Optional Backlight Connection
The loop power meter has an optional backlight connection provided. It is intended to be powered by either a separate
12 to 36 VDC @ 35 mA maximum power supply or by the same power supply used for the pulse output. Both options
are shown in
Figure 26 below.
Figure 26: Backlight Using External Power Supply
Freq Out +
Freq Out –
Freq. Out voltage = +V
Select resistor so that current
R current limit 10K
+V
through Freq. Out < 40 mA
+ Pwr Bklght
– Pwr Bklght
DC Power Freq Out +
Freq Out – DC Common
Freq. Out voltage = +V
Select resistor so that current through Freq. Out < 40mA
R current limit 10K
+ Pwr Bklght
– Pwr Bklght
12 to 36 VDC
35 mA max.