OPERATION FLT
®
Series FlexSwitch
TM
20 Fluid Components International LLC
Figure 3-2 5208 Control Circuit Component Locations
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. Observe that the no-flow signal is greater than the normal flow signal.
No-Flow Signal = ________ volts DC
3. Determine the setpoint by calculating the average of the normal (step 8) and no-flow output signals; e.g., if the normal signal is 2.000
volts and the no-flow signal is 5.000 volts, then the calculated setpoint would be 3.500 volts.
4. Record this value.
Calculated Setpoint = ________ volts DC
Note:
The calculated setpoint must be at least 0.050 volts greater than the normal signal to ensure that the alarm will reset.
5. Move the Mode switch to the CAL position.
6. Adjust the calibration potentiometer (R24) until the voltmeter equals the calculated setpoint.
7. For the appropriate alarm, determine whether the status LED is on or off (red for Alarm No. 1 or green for Alarm No. 2). If the LED is off,
turn the setpoint 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 setpoint adjustment potentiometer (R26 for Alarm No. 1 or R25 for Alarm No. 2) counterclockwise until the LED
turns off and then turn pot slowly clockwise just until the LED turns on.
8. If this is the only flow application alarm to be set up, then skip to the Continue With The Air/Gas Flow Applications Procedure.
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