Fluid Components International FLT93 Nuclear - Manual (Page 24)

OPERATION FLT ® Series FlexSwitch TM
24 Fluid Components International LLC
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).
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 Air/Gas Flow Procedure
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.
4. 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.
5. Reestablish the normal process fl ow condition. Both the LED and the relay contacts should reset.
6. Disconnect the voltmeter from P1.
7. Replace the enclosure cover.
Note: The alarm can be set for a specifi c fl ow rate. Follow the Air/Gas Flow Application procedure up to step 7 except establish the
specifi c fl ow rate rather than the normal fl ow. The output signal will be the set point value. Determine whether the alarm
should actuate with decreasing or increasing fl ow and skip to the appropriate step 4 in Detecting Decreasing Flow or Detect-
ing Increasing Flow, respectfully. Enter the specifi c fl ow rate value as the set point. Then follow the Continue With the Air /
Gas Flow Procedure steps.
The relay logic default confi guration is set for the relay coil to be de-energized when the fl ow signal voltage is greater than
the set point value. (i.e., Assume that the normal process fl ow condition has been established. In this state, the relay coil
will be energized if the alarm has been set for low-fl ow detection and de-energized if the alarm has been set for high fl ow
detection.) A recommendation is to have the relay coils energized when the process condition is normal. This will enable the
alarm to close or open the contacts in case of a power failure.
Wet/Dry Liquid Level Applications
1. Remove the instrument’s enclosure cover.
2. Ensure the confi guration jumpers on the control circuit are correct for this application. See Tables 3-3 through 3-6.
3. Check to make sure the input power jumpers match the power to be applied to the instrument. See Table 3-2.
4. Apply power to the instrument. Verify the yellow LED is on and allow the instrument fi fteen minutes to warm-up.
5. Verify the mode switch is in the RUN position.
6. Attach a DC voltmeter to P1 with the positive (+) lead to position one and the negative (-) lead to position two.
Note: The terminal block can be unplugged from the control circuit to facilitate easy connections.