Fluid Components International MT86_MT86HT Manual Troubleshooting - Manual (Page 9)

Doc. No. 003162 Rev. F 5 - 9 Models MT86, MT86HT
CHAPTER 5 - TROUBLESHOOTING FLUID COMPONENTS INTL
Figure 5-4. Decade Box Wiring Diagram
9. Turn the power ON and let the system stabilize for 1 minute. If the LED (CR1) is flashing, recheck the wiring
per Chapter 2.
10. Read the signal displayed on the DMM. It should be equal to the signal value recorded on the Delta "R" Data
Sheet ± 0.20 Vdc.
11. Repeat the above steps for other values on the Delta "R" Data Sheet. Adjust the active decade box to give one
of the recorded output signals. Then, determine what the Delta "R" value setting is and compare it with the
recorded value from the Delta "R" Data Sheet. The Delta "R" values should be equal to within ± 1.25%.
12. Repeat this verification procedure for each of the sensing points in the system. Be sure to use the proper Delta
"R" Data Sheet for each sensing point being verified.
13. Upon completion of the verification procedure, set the head-select switch SW2 to the number of sensing points
present in the system. The flow transmitter only scans the number of flow elements set on head-select switch
SW2. Open SW1-3 for the automatic mode. Leaving these switches set in the wrong positions will cause an
operation error.
Calibration Verification Procedure (Using an FC81 Field Calibrator)
Note: All output modules and display options operate from the same 0-10 Vdc analog output signal. If the
optional span and zero activation circuitry has been added to the output signal, then the Delta "R" Data
for the output modules and displays will not match the values recorded on the Delta "R" Data Sheet.
See the jumper listing in Table 3-1 to determine if the span and zero activation circuitry option has
been added to the output signal circuitry.
The FC81 Field Calibrator replaces the decade resistance boxes and the DMM that are used in the verification
procedure. The field calibrator can switch its readout between the Delta "R" resistance values and the output signal.
The use of the field calibrator requires having the correct Delta "R" Data Sheets for each flow element. The field
calibrator is ideal for the field verification of MT86 and MT86HT installations.
Model FC81-8 is used for the MT86 with 1000 ohm flow element sensing point RTDs.
Model FC81-7 is used for the MT86HT with 100 ohm flow element sensing point RTDs.