FLT93 Flow Switch Series
FLUID COMPONENTS INTERNATIONAL LLC
Doc. No. 06EN003312 Rev. D
9
This page is subject to proprietary rights statement on last page
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 the tables on page 4.
3. Check to make sure the input power jumpers match the power to be applied to the instrument. See the power input
table on page 4.
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 the figure on page 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
Continue With the Air/Gas Flow Procedure
1. Slide the mode switch to the RUN position.
2. Establish the normal process flow condition. For low-flow alarm setups, the status LED should be off. For high flow
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-flow
alarms, off for high flow alarms, and the relay contacts should change state.
5. Reestablish the normal process flow 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 specific flow rate. Follow the Air/Gas Flow Application procedure up 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 4 in Detecting Decreasing Flow or Detecting Increasing Flow, respectfully. Enter the
specific flow rate value as the set point. Then follow the Continue With the Air /Gas Flow Procedure steps.
The relay logic default configuration is set for the relay coil to be de-energized when the flow signal voltage
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.) 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.
