
2104349 rev. AD
Page 35
Again, the 4-20 mA transmitter that was selected by the user must be fully
operational at voltages as low as VCC
– 5 VDC. Again, VCC is the source voltage
available at the user’s site, and 5 VDC represents the voltage dropped across the
meter’s 250 OHM resistor at the maximum loop current (20 mA).
Totalflow can provide a 12 to 24 VDC converter. This converter can be powered
from the meter’s VBAT (either comm ports or J16). The converter’s 24 VDC output
can then be used to power the 4-20 mA transmitter loop. In other words, VCC
would now be 24 VDC. Subtracting the 5-volts dropped across the 250 OHM
resister would leave 19 VDC to power the transmitter.
VCC
2-wire (line powered)
4-20ma transmitter
250
Ω
User supplies 250
Ω
resistor and wires it
across the AI input
pins
Flowmeter
External to
flowmeter
VCC
2-wire (line powered)
4-20ma transmitter
250
Ω
Onboard 250
Ω
resistor selected
using three-pin
jumper
Flowmeter
External to
flowmeter
1
3
VCC
3-wire 4-20ma transmitter
250
Ω
Flowmeter
External to
flowmeter
To PCCU Control
Onboard 250
Ω resistor is
selected in PCCU setup
A
B
C
AI +
AI -
AI +
AI +
AI -
AI -
To A/D Converter
To A/D Converter
To A/D Converter
Summary of Contents for XSeries G4 6200
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