FLUID COMPONENTS INTERNATIONAL LLC
FLT93 Flow Switch Series
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8
Doc. No. 06EN003312 Rev. D
Detecting Decreasing Flow (low flow alarm)
1. Stop the process flow and allow the signal to stabilize.
2. Record the no-flow signal. (The no-flow signal should be greater than the normal flow signal.)
No-Flow Signal = ________ volts DC
3. Determine the set point by calculating the average of the normal and no-flow output signals. (i.e.; If the normal
signal is 2.000 volts and the no-flow signal is 5.000 volts, then the calculated set point would be 3.500 volts.)
4. Record this value.
Calculated Set Point = ________ volts DC
Note:
The calculated set point must be at least 0.020 volts greater 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 off, turn the set point adjustment potentiometer (R26 for alarm No. 1 or R25 for alarm No.2) slowly
clockwise just until the LED turns on .
OR
If the LED is on, turn the set point adjustment potentiometer (R26 for alarm No. 1 or R25 for alarm No. 2)
counterclockwise until the LED turns off and then slowly clockwise just until the LED turns on.
8. If this is the only flow application alarm to be setup, then skip to the Continue With the Air/Gas Flow Procedure.
Detecting Increasing Flow (high flow alarm)
1. Establish the excessive process flow condition and allow the signal to stabilize.
2. Record the high flow signal. (The high flow signal should be less than the normal flow signal.)
High Flow Signal = ________ volts DC
3. Determine the set point by calculating the average of the normal and high flow output signals. (i.e., If the normal
signal is 2.000 volts and the high flow signal is 1.000 volts, then the calculated set point would be 1.500 volts.)
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.
