Fluid Components International FLT Series - Manual (Page 26)

FLUID COMPONENTS INTL CHAPTER 3 - OPERATION
FLTÔ Series FlexSwitchÔ 3 - 8 Doc. No. 06EN003246 Rev. B
13. Slide the mode switch to the CALIBRATE position.
14. Adjust the calibrate potentiometer (R24) until the voltmeter equals the calculated set point.
15. For the appropriate alarm, determine whether the status LED is on or off (red for No. 1 or green for No. 2).
16. Follow either the Detecting Dry Condition or the Detecting Wet Condition for each level application alarm.
Detecting Dry Condition (low level alarm)
If the status 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 status 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.
Detecting Wet Condition (high level alarm)
If the status 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 status 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.
17. Slide the mode switch to the RUN position. The status LED should be on if the sensing element is dry and off if
the sensing element is wet.
18. Monitor the voltmeter display while raising or lowering the process fluid level. When the output signal passes
through the set point, the status LED should change states and the relay contacts should change state.
19. Reestablish the normal level condition. Both the LED and relay contacts should reset.
20. Disconnect the voltmeter from P1.
21. Replace the enclosure cover.
Note: The relay logic default configuration is set for the relay coil to be de-energized when the level signal is
greater than the set point value. (i.e., The relay coil will be de-energized when the sensing element is dry.)
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.
Temperature Applications
For temperature versus voltage values, see Table 3-7 located at the rear of this chapter. These values have an
accuracy of ±5°F (2.78°C). There is also a conversion formula later in this chapter to convert the temperature output
voltage to degrees fahrenheit. If a factory calibration chart was ordered look for it in the plastic page protector at the
back of this manual. Make sure the serial number of the chart matches the instrument to be adjusted.
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.
Caution: If both alarms are to be used for temperature, then remove the heater control jumper from the heater, control
header. The jumper may be stored on the control circuit by plugging it across J12 and J14. Placing the
jumper here will not turn on the heater. If one alarm is for temperature and the other is for flow or level,
then set the heater power according to the application. Use alarm No. 2 for the temperature alarm. See
Table 3-3.