Fluid Components International FLT Series Rack Mount - Manual (Page 42)

Doc. No. 06EN003250 Rev. N/C 3 - 7 FLT  Series FlexSwitch  Rack Mount
CHAPTER 3 - OPERATION FLUID COMPONENTS INTL
Note: The alarm can be set for a specific flow rate. Follow the procedure above to step 7 except establish the
specific flow rate rather than the normal flow. The output signal will be the set point value. Determine
whether the alarm should actuate with decreasing or increasing flow and skip to the appropriate step
9.d) respectfully. Enter the specific flow rate value as the set point and follow the remaining steps.
Note: The relay logic default configuration is set for the relay coil to be de-energized when the flow signal is
greater than the set point value. (i.e., Assume that the normal process flow condition has been
established. In this state, the relay coil will be energized if the alarm has been set for low-flow detection
and de-energized if the alarm has been set for high flow detection.)
Wet/Dry Liquid Level Applications
1. Ensure the configuration jumpers on the control circuit are correct for this application. (See Tables 3-2 through
3-6.)
2. Apply power to the instrument. Verify the yellow LED is on and allow the instrument fifteen minutes to warm-
up.
3. Verify the mode switch is in the RUN position.
4. Attach a DC voltmeter to the P1 connector with the positive (+) lead to pin P1-D12 and the negative (-) lead to
pin P1-B12; or the P2 connector with the positive (+) lead to pin P2-1 and the negative lead (-) to P2-2.
5. Raise the process fluid level so the sensing element is wet.
6. Allow the output signal to stabilize and record the wet condition value.
Wet Condition Signal = ________ volts DC
Note: The output signal is relative to the type of process media detected. (See Figure 3-4.)
7. Lower the process fluid level so the sensing element is dry.
8. 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
9. Determine the set point by calculating the arithmetic mean 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.)
10. Record this value.
Calculated Set Point = ________ volts DC
Note: The calculated set point must be at least 0.020 volts greater than the wet signal and 0.020 volts less than
the dry signal to ensure that the alarm will reset.
11. Slide the mode switch to the CAL position.
12. Adjust the calibrate potentiometer R27 (below the mode switch) until the voltmeter equals the calculated set
point.
13. For the appropriate alarm, determine whether the status LED is on or off (red for alarm 1 or green for alarm 2).
14. Follow either the Detecting Dry Condition or the Detecting Wet Condition for each Level application alarm.
Detecting Dry Condition (low level alarm)
a) If the status LED is off, turn the set point adjustment potentiometer (R30 for alarm 1 or R29 for
alarm 2) slowly clockwise just until the LED turns on.