Fluid Components International MT91 Manual Operation - Manual (Page 12)

FLUID COMPONENTS INTL CHAPTER 3 - OPERATION
Model MT91 Multipoint Flowmeter 3 - 12 Doc. No. 003185 Rev. B
d. Select 5=Outside to activate the relay if flow or temperature values go outside the switch point range.
Enter a numeric value for the lower limit of the switch point range. Press ENTR to accept the value.
Enter a numeric value for the upper limit of the switch point range. Press ENTR to accept the value.
4. Select 3=Hysteresis from menu level 2.2.3 Relays.
5. Select 1=Rly #1 or 2=Rly #2. Enter a numeric value for the desired deactivation of the switch point. The
display will read "Recovers xxx", this is the deactivation point. Press ENTR to accept the value.
Note: The factory recommends that the password be enabled after making changes to the system parameters if it
has been disabled.
Daily Calibration Testing
The calibration error test interrupts the normal flow metering process to test for shifts or changes in parameters that
affect the calibrated accuracy of the flowmeter. This test can be manually initiated by using the keypad to make a
selection from the system menu, or it can be scheduled to automatically occur periodically with a 24-hour interval.
Both channels of the analog output card are driven to set values during the test. Figure 3-8 shows the screens that
will display during the calibration test sequence.
S E L F T E S T I N G
Heaters are OFF
2 minute 4 mA out
HOME to exit
S E L F T E S T I N G
Heaters are OFF
2 minute 12 mA out
HOME to exit
S E L F T E S T I N G
Heaters are OFF
2 minute 20 mA out
HOME to exit
S E L F T E S T I N G
Balancing Sensor 1
Please Wait
Press Home to Exit
S E L F T E S T I N G
Heaters are ON
3 minute warmup
HOME to exit
U N B A L A N C E D H E A D S
1 . . . 5 . . . . 0 . . . . 5 .
x . . . . . . . . . . . . . . .
(x = suspect)
Bal Dev = 0.00%
L o w D e v = 0.00%
M i d D e v = 0 . 0 0 %
Hi Dev = 0.00%
A
B
D
F C
E
G C00280-1
Figure 3-8. Calibration Test Display Screens
While screen A is displayed, the analog outputs are at a 4 mA or 0 Vdc level. While screen B is displayed, the
analog outputs are at a 12 mA, 2.5 Vdc or 5 Vdc. While screen C is displayed, the analog outputs are at 20 mA, 5
Vdc, or 10 Vdc. Each of these screens and corresponding outputs are sustained for two minutes. Screen D will
display for each sensing point that is assigned to the flowmeter. From this point until the conclusion of the test, the
analog output will be fixed at 4 mA. When screen E displays, the system has completed the calibration test and the
heaters have been turned back on.