Fluid Components International FLT93 Nuclear - Manual (Page 26)

OPERATION FLT ® Series FlexSwitch TM
26 Fluid Components International LLC
Detecting Wet Condition (high level alarm)
If the status 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 status 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.
17. Slide the mode switch to the RUN position. The status LED should be on if the sensing element is dry and off if the sensing element is
wet.
18. Monitor the voltmeter display while raising or lowering the process fl uid level. When the output signal passes through the set point, the
status LED should change states and the relay contacts should change state.
19. Reestablish the normal level condition. Both the LED and relay contacts should reset.
20. Disconnect the voltmeter from P1.
21. Replace the enclosure cover.
Note: The relay logic default confi guration is set for the relay coil to be de-energized when the level signal is greater than the set
point value. (i.e., The relay coil will be de-energized when the sensing element is dry.) 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.
Liquid Flow Applications
1. Remove the instrument’s enclosure cover.
2. Check to make sure the input power jumpers match the power to be applied to the instrument. See Table 3-2.
3. As necessary, set the following control circuit confi guration jumpers. See Tables 3-3 through 3-6.
Application: J20 or J18 (Flow/Level) for alarm No. 1 or No. 2, respectively.
Heater Power: J32 (3 watts for FLT93-S or 0.57 watts for FLT93-F).
4. Apply power to the instrument. Verify the yellow LED is on. 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 connector 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.
The output signal at connector P1 will vary inversely with changes in the process fl ow rate. The output signal level is also
relative to the type of process media being measured. See Figure 3-3.
7. Establish the normal process fl ow condition and allow the signal to stabilize.
8. Record the normal fl ow signal value.
Normal Flow Signal = ________ volts DC
9. Follow either the Detecting Decreasing Flow or Detecting Increasing Flow procedure for each Liquid fl ow application alarm.
Detecting Decreasing Flow (low fl ow alarm)
1. Stop the process fl ow and allow the signal to stabilize.
2. Record the no-fl ow signal. (The no-fl ow signal should be greater than the normal fl ow signal.)
No-Flow Signal = ________ volts DC
3. Determine the set point by calculating the average of the normal and no-fl ow output signals. (i.e.; If the normal signal is 0.080 volts and
the no-fl ow signal is 0.300 volts, then the calculated set point would be 0.190 volts.)
4. Record this value.
Calculated Set Point = ________ volts DC