Badger Meter Vortex Meters - Manual (Page 10)

10 09-VRX-UM-00408 07/12
Wiring
A two conductor cable of 16 to 24 AWG solid or stranded wire is required to make connections to the fl ow meter. It is recommended
that a shielded interconnecting cable be used. The maximum cable length for the power depends on the supply voltage lines
required to drive the fl ow meter and the current meter being used to monitor the current output of the fl ow meter. The maximum
length of the cable is determined by using Figure 5 to calculate the maximum load (resistance in Ohms) that can be driven using
the known power supply voltage. In determining this value the voltage drop across the meter being used to monitor the current
output of the fl ow meter must be considered. After this value has been found, Table 3 can be used to calculate the resistance in
the cable being used and adjust the input voltage as required.
Ohms/Ft Related to Wire Size (AWG)
16 AWG = 0.00420 Ohm/Ft
18 AWG = 0.00651 Ohm/Ft
20 AWG = 0.01035 Ohm/Ft
22 AWG = 0.01310 Ohm/Ft
24 AWG = 0.02620 Ohm/Ft
TABLE 3 - LINE RESISTANCE FOR CURRENT LINES
Operate in the
Shaded Regions
200
100
300
400
500
600
700
800
900
1000
1100
1200
10 12 14 16 18 20 22 24 26 28 30
Loop Voltage (VDC)
L
o
op L
oad (
O
hms)
Loop Voltage - 7 VDC
0.02
= Maximum Loop Resistance
FIGURE 5 - LOAD RESISTANCE VS. SUPPLY VOLTAGE