OPERATION MT86/MT86HT Flow Meter
10 Fluid Components International LLC
Apply Power
When an open flow meter has power applied, the operator assumes all responsibility for conformance to safety
standards and safe practices.
Verify the wiring, then apply power to the flow meter. There are no special instructions for shutdown of the flow meter; just remove the
operating power.
Wait a minimum of 10 minutes for flow meter to stabilize. The output signal indicates the media flow. There is no operator action needed
because the flow meter operates from the factory settings.
If the output signal is zero, is out-of-range for the expected values or is obviously not right then turn off the power and go to
TROUBLESHOOTING, page 19, to find the problem.
Operator Interaction
There is little need for interaction between the operator and flow meter. The flow meter is fully automatic when it operates in the normal
monitor mode. FCI advises the use of factory default settings that the flow meter was ordered with. Do not reset the flow meter's operating
values by trial and error.
A calibration table can be found in the back of this manual. The table shows a listing of the actual mass flow values as indicated by the
output signal. For example: using the standard 4-20 mA output signal, if the signal is 12.0 mA, find 12.0 in the milliamp row and read
across to the next column for the measured flow.
The output signal provides an instant readout of mass flow. The output signal shows only the flow rates between the upper and lower limits
of the calibrated range. For zero-based instruments the output signal will show zero whenever the flow rate is below the calibrated lower
limit. For non-zero-based instruments the output signal will read the minimum specified flow rate.
The flow totalizer accumulates the total quantity of media that has passed the flow element over a specific time.
Short two connector terminals together on the display board to reset the flow totalizer display, see Figure 4 for details. In applications
where the operator is required to reset zero, FCI recommends that these terminals be brought out to a convenient reset switch.
Non-Zero Based Calibration
This is a factory preset item.
In a non-zero based calibration, the low-limit output signal (4 mA) is equal to the minimum calibrated flow. The minimum calibrated flow is a
value greater than zero. The flow meter's output signal indicates the low-limit flow signal (4 mA) from zero flow up to the low-flow limit
parameter. Use a non-zero based calibration when the minimum flow rate does not approach zero and the turndown ratios are small.
At no-flow, the output signal will indicate the minimum calibrated flow.
Zero Based Calibration
In a zero-based calibration, the slope of the output signal is shifted so the low-limit flow output signal (4 mA) is equal to zero flow. See
Figure 7 for details. Flow meters cannot measure zero flow accurately. The flow meter reads out the low-limit signal (4 mA) from zero flow
up to the minimum calibrated flow. Then the output signal steps up to the proper signal value of the mass flow.
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