Fox Thermal FT1 User manual

MODEL FT1 FLOW METER TROUBLESHOOTING GUIDE
Rev. B
Precision Mass Flow Measurement
An ON
I CON Brand
Phone: [phone] • Fax: [phone] • www.foxthermal.com
This document has been created to assist Fox Thermal’s technical service staff to resolve ow meter problems. Your
assistance to provide complete details is appreciated. At times, you may need to refer to the FT1 Instruction Manual.
A link to the Fox Thermal model FT1 Instruction Manual is located on the “Downloads” tab of the FT1 product
webpage or you can use the direct link below:
https://www.foxthermal.com/products/pdf/ft1/ft1-manual.pdf
Section A: General information:
1. What is the serial number and model number of the ow meter?
2. Please describe the problems in detail.
3. Approximately when did the problem start? Did the ow meter ever work properly or has the problem existed
since the initial installation?
Section B: Troubleshooting:
1. Please provide all alarm codes shown on the display #3 of the meter. You can also read the alarms using a
laptop and Fox’s FT1 View™ software. Refer to FT1 Instruction Manual for a full list of alarm codes.
2. What is the measured input power to the ow meter?
3. Test/Check fuses and LED status lights for FT1.
• With the power off, take a resistance measurement across the fuse to ensure it measures less than 1 ohm.
• Is the LP3 LED on main board blinking once per second?
4. Have any of the ow meter settings been changed since you received the meter from Fox?
Figure B.1: FT1 Wiring Access and Location of Fuse, USB, and LED Indicators
( - ) (+) ( - ) (+)
Power
12-28VDC
4-20mA
!
Transmit LED (Yellow)
Heartbeat LED (Green)
Receive LED (Orange)
TS1
Fuse
Earth Ground
+12 to 28VDC
12 to 28VDC Return

MODEL FT1 FLOW METER TROUBLESHOOTING GUIDE
Rev. B
Precision Mass Flow Measurement
An ON
I CON Brand
Phone: [phone] • Fax: [phone] • www.foxthermal.com
Section C: Investigating ow meter inaccuracy:
1. How high or low is the ow meter reading and at what ow rate? Please provide specic data.
2. Conrm that the 4mA and 20mA scaling in the PLC or DCS matches the scaling in the ow meter's settings. If
you are using the 4-20mA output also conrm 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 conguration?
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 ow meter's
Calibration Certicate?
8. Compare the STP (Standard Temperature and Pressure) settings (values and units) in the meter with the
information recorded on the calibration certicate. Do the settings match? This is a requirement for accurate
measurement.
9. How much straight pipe is upstream and downstream of the ow meter? Fox recommends a minimum of 15
diameters of straight pipe upstream of the ow meter and 10 diameters downstream. Refer to FT1 Instruction
Manual for upstream and downstream conditions for insertion and owbody types.
10. Is the ow indicator on the ow meter probe pointing in the direction of ow? If your meter is an inline-type,
is the ow body or spool piece installed with the ow conditioner on the upstream side of the sensor? Refer to
the FT1 Instruction Manual for information regarding the direction of ow.
For assistance contact the Fox Thermal Service Department:
Phone: [phone]
Email: ser[email protected]