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Reference Manual
00809-0100-4444, Rev AC
Section 3: Advanced Installation Details
January 2015
Advanced Installation Details
3.4.2 Connect discrete output
The discrete output control function can be configured to drive an external signal to indicate
zero flow, reverse flow, empty pipe, diagnostic status, flow limit, or transmitter status. The
following requirements apply:
Supply Voltage: 5 to 28 VDC
Maximum Voltage: 28 VDC at 240 mA
Switch Closure: solid state relay
For discrete output control, connect the power source and control relay to the transmitter. To
connect external power for discrete output control, complete the following steps:
1. Ensure the power source and connecting cable meet the requirements outlined
previously.
2. Turn off the transmitter and discrete power sources.
3. Run the power cable to the transmitter.
4. Channel 1: Connect -DC to terminal 5.
Connect +DC to terminal 6.
5. Channel 2: Connect -DC to terminal 7.
Connect +DC to terminal 8.
Refer to Figure 3-9 and Figure 3.5.
Figure 3-9. Connect Discrete Output to Relay or Control System Input
Note
Total loop impedance must be sufficient to keep loop current below maximum rating. A resistor
can be added in the loop to raise impedance.
Control Relay
or Input
5-28 V DC
Power Supply