Fluid Components International FLT Series - Manual (Page 28)

FLUID COMPONENTS INTL CHAPTER 3 - OPERATION
FLTÔ Series FlexSwitchÔ 3 - 10 Doc. No. 06EN003246 Rev. B
3. Establish the process alarm condition and monitor the voltmeter display.
4. When the output signal passes through the set point value, the status LED should turn on for high temperature
alarms, off for low temperature alarms, and the relay contacts should change state.
5. Reestablish the normal process temperature condition. The LED and relay contacts should reset.
6. Disconnect the voltmeter from P1.
7. Replace the enclosure cover.
Note: The relay default configuration is for the relay coil to be de-energized when the temperature signal is greater
than the set point value. (i.e., Assume that the normal process temperature condition has been established.
In this state, the relay coil will be energized.)
Liquid Flow Applications
1. Remove the instrument's enclosure cover.
2. Check to make sure the input power jumpers match the power to be applied to the instrument. See Table 3-2.
3. As necessary, set the following control circuit configuration jumpers. See Tables 3-3 through 3-6.
Application: J20 or J18 (Flow/Level) for alarm No. 1 or No. 2, respectively.
Heater Power: J32 (3 watts for FLT93-S or 0.57 watts for FLT93-F).
4. Apply power to the instrument. Verify the yellow LED is on. Allow the instrument fifteen minutes to warm-up.
5. Verify the mode switch is in the RUN position.
6. Attach a DC voltmeter to P1 connector with the positive (+) lead to position one and the negative (-) lead to
position two.
Note: The terminal block can be unplugged from the control circuit to facilitate easy connections. The terminal
block is used in late production instruments. Early production instruments used a mating cable and
connector. If a cable and connector are required use FCI part number 015664-01 to order.
The output signal at connector P1 will vary inversely with changes in the process flow rate. The output
signal level is also relative to the type of process media being measured. See Figure 3-3.
7. Establish the normal process flow condition and allow the signal to stabilize.
8. Record the normal flow signal value.
Normal Flow Signal = ________ volts DC
9. Follow either the Detecting Decreasing Flow or Detecting Increasing Flow procedure for each Liquid 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 0.080 volts and the no-flow signal is 0.300 volts, then the calculated set point would be 0.190 volts.)
4. Record this value.
Calculated Set Point = ________ volts DC