Series 730 Instruction Manual
8
IM-73-E
Output Signal Wiring
All flow meters are equipped with either a calibrated 0–5 VDC, 0–10
VDC or 4–20 mA output signal. These linear output signals represent
0 to 100% of the flow meter user full scale.
DC Output Wiring
The 0-5 VDC or 0-10 VDC output signal can drive a minimum load of
1000 Ohms. For 0-5 VDC or 0-10 VDC connections, connect to the
terminals marked Output signal and Signal ground.
4–20 mA Output Wiring
The 4-20 mA current loop output is self-powered (non-isolated).
The maximum loop resistance (load) for the output is 400 Ohms. For
a 4–20 mA connection, connect to the terminals marked Output sig-
nal and Signal ground.
Troubleshooting the Flow Meter
Begin hardware troubleshooting by verifying the following facilities is-
sues are correct. These areas impact system operation and must be
corrected prior to performing any flow meter inspections.
1. Verify the incoming power to the flow meter is present and of the
correct voltage and polarity.
2. Check the flow meter wiring for correct connections.
3. Verify the flow meter is installed with the correct number of up-
stream and downstream pipe diameters as shown in Figure 2.
4. Verify the flow direction indicator is correctly aligned pointing
downstream of flow.
5. Make sure there are no leaks in the line being measured.
After verifying the factors above, follow the troubleshooting procedures
outlined on the next page. If you need to return the flow meter to the
factory, see page 10 for return shipping instructions.
Flow Meter Calibration
Sierra Instruments maintains a fully-equipped calibration laboratory.
All measuring and test equipment used in the calibration of Sierra me-
ters are traceable to NIST standards. Sierra is ISO-9001 registered and
conforms to the requirements of ANSI/NCSL-Z540 and ISO/IEC
Guide 25. If the flow body or electronics have been damaged or you
simply want to have the flow meter re-calibrated, contact the factory
for return shipping instructions. Calibration must be performed by
qualified personnel using NIST-traceable equipment.
Caution!
Do not connect power to
the 4-20 mA terminals.
Caution!
Before attempting any flow
meter repair, verify that the
line is not pressurized.
Caution!
Always remove main power
before disassembling any
part of the mass flow meter.