Fluid Components International FLT Series - Manual (Page 23)

CHAPTER 3 - OPERATION FLUID COMPONENTS INTL
Doc. No. 06EN003246 Rev. B 3 - 5 FLTÔ Series FlexSwitchÔ
Figure 3-3. Flow Application Signal Output
8. Record the normal flow signal value.
Normal Flow Signal = ________ volts DC
9. Follow either the Detecting Decreasing Flow or the Detecting Increasing Flow procedure for each flow
application alarm.
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.