MT86/MT86HT Flow Meter TROUBLESHOOTING
Fluid Components International LLC 19
5 TROUBLESHOOTING
Only qualified personnel should attempt to test this instrument. The operator assumes all
responsibilities for safe practices while troubleshooting.
The flow transmitter contains electrostatic discharge (ESD) sensitive devices. Use standard ESD
precautions when handling the flow transmitter. See INSTALLATION, page 3, for ESD details.
Quick-Check Troubleshooting
At this point, observe the system setup to verify operation. Use Table 3 as a quick check of problems and solutions. More in-depth
discussions follow this table.
Table 3 – Quick Check Troubleshooting
No Output Check power application, check power supply fuse.
Flashing LED Set SW2 on the control board to the total number of sensing points.
Check all connectors for proper seating.
Switches SW1-1 through 1-3 should be open, 1-4 is a temp. comp. switch, that is open
when temp. comp. is used and closed when temp. comp. is not used.
Check jumper positions (factory set positions are jumpers 1, 3, 5 and 7 installed).
The above switches and jumpers are on the control board.
Check the flow elements FLAT and FLOW ARROW versus the flow media.
Troubleshooting Equipment
2 each, digital multimeter (DMM) capable of measuring ohms, milliamps, and AC or DC voltage with a 4 1/2 digit resolution.
3 each, precision decade resistance boxes (however they are optional if fixed precision resistors are used).
1 each, 1K ohm resistor for model MT86 or 100 ohms for model MT86HT.
Non-Maintenance Observations
At this point, observe the system setup to verify operation. No disassembly or testing is required at this time.
Check Serial Numbers
Verify that the serial number of the flow element(s) and the flow transmitter are the same. The flow elements and the flow transmitter are a
matched set and cannot be operated independently of each other.
Check Input Power
Check for intact fuses. Verify that the correct power source is connected and turned on.
Check Instrument Installation
Review the instrument installation information given in INSTALLATION, page 3, to verify correct mechanical and electrical installation. Be
sure the connectors are firmly mated, and the wires are firmly attached to the connector. Be sure the wires are inserted between the metal
clamps and not between the clamp and plastic connector enclosure.
Check for Moisture
Check for moisture in the enclosures. Moisture on the electronics can cause faulty operation.
If a component of the process media is near its saturation temperature, then the component may condense on the sensing points. Liquid
on the sensing points can cause measurement errors.
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