Fluid Components International MT86_MT86HT Manual Operation - Manual (Page 7)

Doc. No. 003162 Rev. F 3 - 7 Models MT86, MT86HT
CHAPTER 3 - OPERATION FLUID COMPONENTS INTL
If a span and zero adjustment can not be done, the other choice for adjustment is an EPROM replacement. The
EPROM stores the data that represents the calibrated flow rate and the performance curve. FCI can provide a new
EPROM with the new data and/or range. The customer does have to provide FCI with Analog-to-Digital (A/D)
information and the flow rate so the EPROM can be made. Look at the Delta "R" table to get the A/D number. In
the Delta "R" table, one column is categorized as Voltage In Non-Linear, [TP9 (+) to TP10 (-)].
Use the following equation to calculate the A/D number for the Non-Temperature Compensated flowmeter only.
Write down the results in the chart shown in Figure 3-4.
A/D = ( [TP9 - TP10 (Vdc)]/2 )
X
5( 4096 )
For the Temperature Compensated flowmeter, the A/D equation is:
A/D = [( [TP9 - TP10 (Vdc)]/2 )
X
(4096)]/(TC Gain)
TC Gain is a function of the reference temperature. Additional data for the TC Gain is needed. This data is the REF
SEN (+) to GND SEN (-) voltage from terminal block TS#.
Note: This A/D versus flow information is needed for each flow element sensing point in the flowmeter.
FCI strongly recommends that as much data as possible be gathered because the calibration will be only as good as
the data supplied. Once a new EPROM is provided it will need to be installed (see the Repair procedure in
Chapter 5) and a new Delta "R" table generated (see the preceding section for the procedure).