Dc Input Power Connections; Ma Output Connections - GE PanaFlow MV80 User Manual

2.5.1 DC Input Power Connections

To access the wiring terminal blocks, locate and loosen the small set screw which locks the small enclosure cover in
place. Then, unscrew the cover to expose the terminal block.
Connect 4-20 mA loop power (12 to 36 VDC at 25 mA, 1W max.) to the
block (see Figure 20 below). Torque all connections to 4.43 to 5.31 in-lb (0.5 to 0.6 Nm). The DC power wire size must
be 10 to 20 AWG with 1/4 inch (7 mm) of insulation stripped from each conductor.

2.5.2 4-20 mA Output Connections

The standard PanaFlow meter has a single 4-20 mA loop, with the loop current is controlled by the meter electronics.
The electronics must be wired in series with the sensor resistor or current meter (see Figure 20 above). The current
control electronics requires 12 volts at the input terminals to operate correctly.
The maximum loop resistance (load) for the current loop output is dependent upon the supply voltage and is given in
Figure 21 below. The 4-20 mA loop is optically isolated from the flowmeter electronics.
R is the total resistance in the loop, including the wiring resistance. That is, R
load
maximum load resistance for the loop, subtract the minimum terminal voltage from the supply voltage and divide by
the maximum loop current of 20 mA, as shown in the following equation:
PanaFlow™ MV80 & MV82 User's Manual
12 to 36 VDC
25 mA max.
Figure 20: DC Power Connections
R
max load
1200
900
600
300
0
12 18
Vsupply (volts)
Figure 21: Load Resistance Versus Input Voltage
+PWR
R Load
V 12V
–
supply
--------------------------------- -
=
0.020A
Vsupply
(volts)
Operating
Range
24 30 36
and terminals on the terminal
-PWR
+ Pwr
– Pwr
= R + R
load wire sense
Rmax
(ohms)
12 0
18 300
24 600
30 900
36 1200
Chapter 2. Installation
. To calculate the
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