Fluid Components International FLT93 Nuclear - Manual (Page 27)

FLT ® Series FlexSwitch TM OPERATION
Fluid Components International LLC 27
Note: The calculated set point must be at least 0.020 volts greater than the normal signal to ensure that the alarm will reset.
5. Slide the mode switch to the CALIBRATE position.
6. Adjust the calibrate potentiometer (R24) until the voltmeter equals the calculated set point.
7. For the appropriate alarm, determine whether the status LED is on or off (red for No. 1 or green for No. 2).
If the 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 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.
8. If this is the only fl ow application alarm to be setup, then skip to Continue With the Liquid Flow Applications procedure.
Detecting Increasing Flow Rate (high fl ow alarm)
1. Establish the excessive fl ow condition and allow the signal to stabilize.
2. Record the high fl ow signal. (The high fl ow signal should be less than the normal fl ow signal.)
High Flow Signal = ________ volts DC
3. Determine the set point by calculating the average of the normal and high fl ow output signals. (i.e.; If the normal signal is 0.080 volts
and the high fl ow signal is 0.030 volts, then the calculated set point would be 0.055 volts.)
4. Record this value.
Calculated Set Point = ________ volts DC
Note: The calculated set point must be at least 0.020 volts less than the normal signal to ensure that the alarm will reset.
5. Slide the mode switch to the CALIBRATE position.
6. Adjust the calibrate potentiometer (R24) until the voltmeter equals the calculated set point.
7. For the appropriate alarm, determine whether the status LED is on or off (red for No. 1 or green for No. 2).
8. If the LED is on, turn the set point adjustment potentiometer (R26 for alarm No. 1 or R25 for alarm No. 2) slowly counterclockwise just
until the LED turns off.
OR
If the LED is off, turn the set point adjustment potentiometer (R26 for alarm No. 1 or R25 for alarm No. 2) clockwise until the LED turns on
and then slowly counterclockwise just until the LED turns off.
Continue With the Liquid Flow Applications
1. Slide the mode switch to the RUN position.
2. Establish the normal process fl ow condition. For low-fl ow alarm setups, the status LED should be off. For high fl ow alarm setups, the
status LED should be on.
3. Establish the process alarm condition and monitor the voltmeter display.
When the output signal passes through the calculated set point value, the status LED should turn on for low-fl ow alarms, off for high
fl ow alarms, and the relay contacts should change state.
4. Reestablish the normal process fl ow condition. Both the LED and the relay contacts should reset.
5. Disconnect the voltmeter from P1.
6. Replace the enclosure cover.