Fluid Components International FLT Series - Manual (Page 25)

CHAPTER 3 - OPERATION FLUID COMPONENTS INTL
Doc. No. 06EN003246 Rev. B 3 - 7 FLTÔ Series FlexSwitchÔ
Wet/Dry Liquid Level Applications
1. Remove the instrument's enclosure cover.
2. Ensure the configuration 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 fifteen 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. The terminal
block is used in late production instruments. Early production instruments used a mating cable and
connector. If a cable and connector are required use FCI part number 015664-01 to order.
7. Raise the process fluid 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 fluid 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.
Figure 3-4. Level Application Signal Output