Onicon Fox Thermal FT2A User manual

MODEL FT2A 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 sta to resolve ow meter problems.
Your assistance to provide complete details is appreciated. At times, you may need to refer to the FT2A Instruction
Manual. A link to the Fox Thermal model FT2A Instruction Manual is located on the “Downloads” tab of the FT2A
product webpage or you can use the direct link below:
https://www.foxthermal.com/products/pdf/ft2a/ft2a-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 FT2A View™ software. Refer to FT2A Instruction Manual for a full list of alarm codes.
2. If the sensor is remote from the electronics please advise the length and gauge of the wire/cable connecting
the sensor junction box to the electronics housing.
3. The serial number on the electronics housing must match the serial number on the probe/sensor assembly.
It is a common mistake to mix the serial numbers when multiple meters with remote electronics are ordered.
Please conrm the probe serial number is the same as on the electronics housing.
4. If the sensor is remote carefully check for proper wire terminations at the sensor junction box and at the
electronics housing (please refer to the ow meter Instruction Manual).
Figure B.1: FT2A Wiring Access and Location of Fuse, USB, and LED Indicators
FT2A Enclosure
Main Board Electronics Inside Display/Cover Remote Enclosure
TS7 TS1
TS2
TS8
OPTIONAL
COMMUNICATION
(DEVICENET
PROFIBUS)
ETHERNET
USB
COMMUNICATION
1 2 3
1
1
2
3
4
5
1 2 3
1
2
3
4
5
6
7
8
9
10
11
1
2
3
4
5
6
7
8
TS3
J1
J4
AC POWER DC POWER
REMOTE
SENSOR
WIRING
I/O WIRING
AND
OPTIONAL
MODBUS
COMMUNICATION
RED
RED
YEL
WHT
WHT
#4
#6
#3
#5
#2
#1
Black Dot Denotes Pin #1
RED
RED
WHT
WHT
GRN WHT
Shield
GRN
BRN
YEL
BLK
RED
Probe Sensor Wired By Fox
SENSOR
RED*
BLK*
BRN*
WHT*
GRN*
Sensor Wires
Cable Shield
LP1
LP4
Fuse

MODEL FT2A FLOW METER TROUBLESHOOTING GUIDE
Rev. B
Precision Mass Flow Measurement
An ON
I CON Brand
Phone: [phone] • Fax: [phone] • www.foxthermal.com
5. What is the measured input power to the ow meter? Refer to FT2A Instruction Manual for input power
requirements.
6. Test/Check fuses and LED status lights for FT2A.
• With the power o, take a resistance measurement across the fuse to ensure it measures less than 1 ohm.
• Is the LP4 LED on the main board emitting a steady orange light?
• Is the green LP1 LED on the inside of the display board blinking once per second?
4. Have any of the ow meter settings been changed since you received the meter from Fox Thermal?
5. If advised by a Fox technical representative please conrm the following sensor resistances are correct. Turn
o power to meter and disconnect sensor wires from TS 8 (the sensor termination terminal strip located at the
bottom of FT2A main board) before taking measurements.
• Sensor wiring: White to White wires= 200 to 225 ohms, Red to Red = .1 ohms, Red to Yellow = 9 to 10
ohms.
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. Is the gas you are measuring the same as is shown on the ow meter calibration certicate? 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 FT2A 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? Is the area setting programmed into the ow meter correct?
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 FT2A Instruction
Manual for upstream and downstream conditions for insertion and owbody types.
10. Is the arrow 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
FT2A Instruction Manual for information regarding the direction of ow.
11. What is the CSV voltage? Please refer to the ow meter Instruction Manual.
For assistance contact the Fox Thermal Service Department:
Phone: [phone]
Email: ser[email protected]