Installation Problems
The following is a summary listing of problems that may be encountered with the
installation of the F-5500 Thermal Mass Flow Meter.
1.
Improper wiring connections for power and/or 4-20mA output signal.
A separate power source is recommended for the F-5500 main board and the
4-20mA output signals. Two wires supply 24VDC power to the main board. Two
wires are used for the 4-20mA output signals. Refer to "Fig. 3.2: 4-20mA Output
Wiring for Customer-Supplied Power Source" on page 31 and "Fig. 3.3: 4-20mA
Output Wiring for Loop Power Provided by F-5500" on page 32. Also refer to
"Wiring Precautions" in Wiring section (p. 29) for further guidance.
2. Inadequate power source.
The F-5500 requires 12 to 28VDC at up to 6 Watts to operate. A 20 Watt power
supply is recommended for powering the F-5500 to ensure it operates properly
under all conditions. If the voltage supplied at the input terminals of the F-5500 is
not within the range, a variety of problems will occur.
3. Flow measurement seems inaccurate.
• Check to ensure that the flow meter is installed so that the Flow Direction
Indicator below the electronics housing is properly pointing in the direction
of flow. Refer to "Fig. 2.5: Orientation of Flow Meter" on page 21. If not,
change orientation of meter.
• Check that the insertion depth of the sensor/probe is correct. The end of the
probe should be adjusted as per "Fig. 2.7a: Standard F-5500" on page 22.
• Ensure that there are a minimum of fifteen diameters of straight pipe upstream
of the sensor and ten diameters downstream. If complex flow disturbances
are upstream of the sensor, extension of the straight pipe may be required to
ensure accurate flow measurement. Contact ONICON for assistance.
• Ensure that pipe inside diameter in the meter matches data on the ONICON
Calibration Certificate. The pipe inside diameter is programmed into the flow
meter through the front panel (see "Flow Parameters" on page 51).
4. Erratic flow reading (especially a flow reading spiking high).
This may be a symptom of moisture in the flow stream. ONICON flow meters
are designed to work in relatively dry gas applications only. Contact ONICON to
discuss resolutions to this problem.
11451 Belcher Road South, Largo, FL 33773 • USA • Tel +1 (727) 447-6140 • Fax +1 (727) 442-5699 • [email protected]
F-5500 Thermal Mass Flow Meter Manual 06/17 - 2030 / 107023
Page 83
Model F-5500
TROUBLESHOOTING
Model F-5500
TROUBLESHOOTING
Precautions
Troubleshooting: Installation Problems
Installation
Problems
