Fluid Components International FLT93 Nuclear - Manual (Page 22)

OPERATION FLT ® Series FlexSwitch TM
22 Fluid Components International LLC
Figure 3-2 5298 Control Circuit Component Locations
Numerical Alarm Set Point Adjustment
The control circuit has two mutually exclusive alarms; they are identifi ed as Alarm No. 1 and Alarm No. 2. Each has an alarm set point adjust-
ment potentiometer and LED indicator. Both alarms can be setup for one of three applications; fl ow, level/interface, or temperature. The
following application specifi c adjustment procedures are generic and can be used for setting either or both alarms. Use Figure 3-2 to help
locate the important setup components (potentiometers, LEDs, etc.)
Air/Gas Flow Applications
1. Remove the instrument’s enclosure cover.
2. Ensure the confi guration jumpers on the control circuit are correct for this application. See Tables 3-3 through 3-6.
3. Check to make sure the input power jumpers match the power to be applied to the instrument. See Table 3-2.
4. Apply power to the instrument. Verify the yellow LED is on and allow the instrument fi fteen minutes to warm-up.
5. Verify the mode switch is in the RUN position.
6. Attach a DC voltmeter to the P1 terminal block 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.
7. Establish the normal process fl ow condition and allow the signal to stabilize.
Note: The output signal at connector P1 will vary inversely with changes in the process fl ow rate. The output signal level is relative to
the type of process media being measured and the heater wattage setting. See Figure 3-3.
8. Record the normal fl ow signal value.
Normal Flow Signal = ________ volts DC
9. Follow either the Detecting Decreasing Flow or the Detecting Increasing Flow procedure for each fl ow application alarm.