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Series 780S Instruction Manual Chapter 4 Troubleshooting & Repair
IM-78S-B 4-1
Chapter 4 Troubleshooting and Repair
Troubleshooting the Flow Meter
Begin hardware troubleshooting by verifying the following facilities
issues 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 as de-
scribed in Chapter 2.
3. Verify the flow meter is installed with the correct number of up-
stream pipe diameters as shown on page 2-2.
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 proce-
dures outlined on the next page. If you need to return the flow meter
to the factory, see page 4-3 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
meters are traceable to NIST standards. Sierra is ISO-9001 regis-
tered and conforms to the requirements of ANSI/NCSL-Z540 and
ISO/IEC Guide 25. If the flow body or electronics have been dam-
aged or you simply want to have the flow meter re-calibrated, con-
tact the factory for return shipping instructions. Calibration must be
performed by qualified personnel using NIST-traceable equipment.
Warning!
Before attempting any flow
meter repair, verify that the
line is not pressurized.
Always remove main power
before disassembling any
part of the mass flow meter.