Fox Thermal FT1 Manuel de dépannage - Page 2

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Fox Thermal FT1 Manuel de dépannage
MODEL FT1 FLOW METER TROUBLESHOOTING GUIDE
Section C: Investigating flow meter inaccuracy:
1. How high or low is the flow meter reading and at what flow rate? Please provide specific data.
2. Confirm that the 4mA and 20mA scaling in the PLC or DCS matches the scaling in the flow meter's settings. If
you are using the 4-20mA output also confirm that the measurement unit (SCFM, KG/HR, NM3H, etc.) in the
Fox meter is the same as in your PLC/DCS.
3. Did the meter ever read accurately or do you believe it has measured incorrectly since it was installed?
4. If measuring a gas mixture, have you checked to be sure that the mixture parts equal 100%? If not, what gas
are you currently measuring?
5. Has there been any change in meter location or pipe configuration?
6. Is the insertion depth setting in accordance with Fox Thermal installation instructions? Refer to FT1 Instruction
Manual for insertion depth.
7. What is the inside diameter (ID) of the pipe? Is the actual pipe ID the same as listed on the flow meter's
Calibration Certificate?
8. Compare the STP (Standard Temperature and Pressure) settings (values and units) in the meter with the
information recorded on the calibration certificate. Do the settings match? This is a requirement for accurate
measurement.
9. How much straight pipe is upstream and downstream of the flow meter? Fox recommends a minimum of 15
diameters of straight pipe upstream of the flow meter and 10 diameters downstream. Refer to FT1 Instruction
Manual for upstream and downstream conditions for insertion and flowbody types.
10. Is the flow indicator on the flow meter probe pointing in the direction of flow? If your meter is an inline-type,
is the flow body or spool piece installed with the flow conditioner on the upstream side of the sensor? Refer to
the FT1 Instruction Manual for information regarding the direction of flow.
For assistance contact the Fox Thermal Service Department:
Phone: 831-384-4300
•
Phone: (831) 384-4300
Fax: (831) 337-5786
•
www.foxthermal.com
Rev. B