Fluid Components International MT91 Manual Troubleshooting - Manual (Page 6)

FLUID COMPONENTS INTL CHAPTER 5 - TROUBLESHOOTING
Model MT91 Multipoint Flowmeter 5 - 6 Doc. No. 003185 Rev. B
1. Go to menu level 3.3.1 (Diagnostics Þ Calibration Tests Þ Start Test).
2. Both channels of the analog output board (see Figure 2-2) are driven to preset vales during the test.
3. The sequence of screens A through E shown in Figure 3-8 will display throughout the test.
a. Screen A displays for 2 minutes while the outputs are held at the zero level.
b. Screen B displays for 2 minutes while the outputs are held at mid-scale level.
c. Screen C displays for 2 minutes while the outputs are held at full scale level.
d. Screen D displays while the system balances and tests each sensing point input channel. From this point
until the conclusion of the test, the analog output will be fixed at zero percent scale.
e. Screen E signals the end of the calibration test. The heaters are turned back on and the system waits three
minutes for them to warm up.
4. To view the test results, go to menu level 3.3.2 (Diagnostics Þ Calibration Tests Þ Display Results). If Screen
F appears, the sensing points that the system could not balance will be displayed.
a. Verify wiring between the flow element and the flow transmitter. If the resistance is very high, the REF
EXC and ACT EXC wires may be switched. Switch the REF EXC wire with the ACT EXC wire and vice
versa.
b. At high temperatures, the balance point may be too far from zero to balance out. Verify if this condition
exists by breaking the heater circuit of the suspect sensing point by removing one of the heater wires
(HTR A SEN or HTR A EXC) from the connector. Then view the sensing point values at menu level
4.2.6. Select the suspect sensing point. Make note of the DelR[x] and RefR[x] values. If DelR[x] does
not drop to a value between -1.0 and 1.0, the balance deviation is too large. Contact Customer Service.
5. Screen G will appear next or immediately after selecting menu level 3.3.2.
a. If the values are not above 3% deviation, the instrument has not drifted more than the daily allowable drift
as specified in 40CFR675.
b. If the values are above 3% deviation, re-calibration of the input board may be necessary, contact Customer
Service.
Spares
When system down time is critical, FCI recommends one of each of the following should be kept as a spare:
controller board (P/N 015796), input board (P/N 015149), relay board (P/N 015235), analog output board (P/N
015231), display board (P/N 014427) and battery (P/N 011616-01. Removal and replacement of boards may
resolve problem faster than troubleshooting. Contact FCI for specific recommendations.
Defective Parts
Before returning any equipment to FCI, please obtain an RA number for authorization, tracking, and repair/
replacement instructions. If a return is required, remove defective unit, replace with spare, calibrate, then return
defective unit to FCI freight prepaid for disposition.
Customer Service
1. In the event of problems or inquiries regarding the flowmeter, please contact the Regional or Country
Authorized FCI Field Agent. There is an extensive list of these representatives at the front of this manual.
2. Before contacting the FCI representative, please be sure that all the applicable information is near so that a
more effective, efficient and timely response may be provided.
3. Refer to Appendix C for specific Customer Service policy provisions.