OPERATION FLT
®
Series FlexSwitch
TM
26 Fluid Components International LLC
Level Applications
1. Ensure that the instrument has been properly installed in the vessel.
2. Apply power to the instrument. Allow fifteen minutes for the sensing element to stabilize.
3. Remove the enclosure cover to access the control circuit for adjustments.
Detecting Dry Condition (Adjustment With Sensing Element Wet)
Verify that the sensing element is wet. If the status LED is off, turn the setpoint adjustment potentiometer clockwise until the LED turns on.
With the LED on, slowly turn the potentiometer counterclockwise one turn past the point at which the LED just turns off. The potentiometer
may have up to one-quarter turn of hysteresis; therefore, if the mark is overshot, repeat the procedure.
Detecting Wet Condition (Adjustment With Sensing Element Dry)
Caution:
Give consideration to the fact that air or gas flowing over the sensing element may decrease the output signal resulting in
a false alarm. If the sensing element is exposed to air or gas flow in the dry condition, or where the process media is highly
viscous, make setpoint adjustments in the wet condition only.
Field adjustments made in the dry condition should be performed in the actual service environment or within a condition that approximates
that environment. Provision should be made for the worst case condition of air or gas flow on the sensing element. If the status LED is on, turn
the setpoint adjustment potentiometer counterclockwise until the LED turns off. (If the LED cannot be turned off, the instrument must be set in
the wet condition.)
With the LED off, slowly turn the potentiometer clockwise 1 turn past the point at which the LED just goes on. The potentiometer may have up
to one-quarter turn of hysteresis; therefore, if the mark is overshot, repeat the procedure.
Signal Output for Level Applications
The output signal at P1 is lowest in water and highest in air. See Figure 3-4.
Temperature Applications
For temperature versus voltage values, see Table 3-7 located at the rear of this section. These values have an accuracy of ±5 °F (±2.78 °C).
There is also a conversion formula later in this section to convert the temperature output voltage to degrees Fahrenheit. If a factory calibration
chart was ordered look at the back of this manual. Make sure the serial number of the chart matches the instrument to be adjusted.Remove
the instrument’s enclosure cover.
1. Remove the instrument’s enclosure cover.
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 on position J33. 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 3-2 or 3-3.
2. Apply power to the instrument. Verify the yellow LED is on. Allow fifteen minutes for the instrument to warm-up.
3. Verify the Mode switch is in the RUN position.
4. Attach a DC voltmeter to P1 with the positive (+) lead to position 3 (yellow) and the negative (-) lead to position 4 (black).
5. Establish the normal process temperature condition and allow the signal to stabilize.
6. Record the normal temperature signal value.
Normal Temperature Signal = ________ volts DC
Note:
The output signal at connector P1 varies in proportion to the process temperature.
7. Follow either the Detecting Increasing Temperature or the Detecting Decreasing Temperature procedure for each temperature application alarm.
To Next Page
Loading...
Need help?
General
