Fluid Components International FLT93 Nuclear - Manual (Page 25)

FLT ® Series FlexSwitch TM OPERATION
Fluid Components International LLC 25
7. Raise the process fl uid level so the sensing element is wet.
8. Allow the output signal to stabilize and record the wet condition value.
Wet Condition Signal = ________ volts DC
Note: The output signal at P1 is relative to the type of process media detected. See Figure 3-4.
9. Lower the process fl uid level so the sensing element is dry.
10. Allow the output signal to stabilize and record the dry condition value. (The dry signal should be greater than the wet signal.)
Dry Condition Signal = ________ volts DC
11. Determine the set point by calculating the average of the wet and dry output signals. (i.e., If the wet signal is 0.200 volts and the dry
signal is 4.000 volts, then the calculated set point would be 2.100 volts.)
12. Record this value.
Calculated Set Point = ________ volts DC
Note: The calculated set point must be at least 0.015 volts greater than the wet signal and 0.020 volts less than the dry signal to
ensure that the alarm will reset.
13. Slide the mode switch to the CALIBRATE position.
14. Adjust the calibrate potentiometer (R24) until the voltmeter equals the calculated set point.
15. For the appropriate alarm, determine whether the status LED is on or off (red for No. 1 or green for No. 2).
16. Follow either the Detecting Dry Condition or the Detecting Wet Condition for each level application alarm.
Detecting Dry Condition (low level alarm)
If the status LED is off, turn the set point adjustment potentiometer (R26 for alarm No. 1 or R25 for alarm No. 2) slowly clockwise just
until the LED turns on.
OR
If the status LED is on, turn the set point adjustment potentiometer (R26 for alarm No. 1 or R25 for alarm No. 2) counterclockwise until
the LED turns off and then slowly clockwise just until the LED turns on.
Figure 3-4 Level Application Signal Output
SET POINT
TIME
OUTPUT VOL
T
A
G
E
AIR OR GAS
OIL
WATER
LED ON
ABOVE SETPOINT
LED OFF
BELOW SETPOINT
R25 AND R26
Adjust
Clockwise,
Turns
LED ON
Adjust
Counter-
clockwise,
Turns
LED OFF
FIELD ADJUSTABLE
SET POINT
0
Potentiometer
(POT)
DIESEL
AIR
TO
WA
TER
WA
TE
R T
O A
IR
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