MT86/MT86HT Flow Meter
TROUBLESHOOTING
Fluid Components International LLC
31
6. If the flow meter has a local display and the new EPROM changes the calibration range, then the display will need to be re-spanned to
the new range.
7. Turn the operating power ON, and then allow five minutes for the flow meter to stabilize.
8. Make a new Delta "R" data sheet for each flow element when the flow meter is operating correctly. The new sheets will be useful when
future calibration and verification checks are made.
General Circuit Board Replacement Procedure
For matching equipment, 100 ohm or 1000 ohm, see
covers the control board and input boards. The power supply,
output board, and display are interchangeable regardless of flow meter type.
The control board is interchangeable for same type call-out. In other words, a control board for a 1000 ohm sensing element is
interchangeable with another control board for a 1000 ohm sensing element, adjustments may be needed.
Table 10 - Components for 100 and 1000 Ohm Flow Meters
Control Board
Adjust Pot.
100 Ohm
1000 Ohm
R8
4.99K, 1%
21.5K, 1%
Gain
20X
10X
Input Board
Adjust Pot.
100 Ohm
1000 Ohm
R1, R7
6.65K
Not Used
RN3
1K
10K
Jumpers Installed, Input Board
Adjust Pot.
100 Ohm
1000 Ohm
001
N/A
J1, 2, 4, 6, 7, 8, 10, 12
002
N/A
J1, 2, 4, 6
003
J3, 5, 9, 11
N/A
004
J3, 5
N/A
Jumpers Installed, Output Board
4-20 mA Output
Jumper
Non Zero-based
J1, 4
Zero-based
J1, 5
Input Board Replacement Procedure
Spare input boards MUST be factory pre-adjusted for the specific flow meter and flow element sensing points. See
parts placement.
1. Turn the operating power OFF.
2. Disconnect the flow element cable from the input board.
3. Remove the four hold-down screws from the input board being replaced. Grasp the PWB and lift while gently rocking the board from
side to side.
4. Position new PWB in the same orientation as the old PWB. Gently press down over the connector to seat it.
5. Install the four hold-down screws in the new PWB.
6. Reconnect the flow element cables to the PWB. Remove the "HTR+" and "HTR-" wires from the connectors and continue with the next
procedure.
7. Perform a sensing point balancing procedure. Contact FCI customer service for the appropriate procedure.
Summary of Contents for MT86
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Page 19: ...MT86 MT86HT Flow Meter OPERATION Fluid Components International LLC 15 Figure 9 A D Data Sheet...
Page 40: ...APPENDIX A DRAWINGS MT86 MT86HT Flow Meter 36 Fluid Components International LLC C01156 1 1...
Page 47: ...MT86 MT86HT Flow Meter APPENDIX C CUSTOMER SERVICE Fluid Components International LLC 43...
Page 48: ...APPENDIX C CUSTOMER SERVICE MT86 MT86HT Flow Meter 44 Fluid Components International LLC...
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