Differential Pressure - FALEX 400 Operation And Maintenance Manual

3. Push the 'Start' button to begin the heat cycle
that will raise the lead assembly temperature
to 350 °C. Once pushed, the 'Heat' button
will disappear.
4. The lead temperature will begin to rise. The
thermocouple must maintain contact with the
lead. An occasional light pressure on the top of
the thermocouple wires may be required. Once
the temperature is above 327.5 °C, the lead will
melt down into the fixture cup. Make sure that the
thermocouple remains in contact with the lead
by pushing it down to the lowest position with the
tip centered in the cup (do not let thermocouple
touch the sides of the lead cup).
The Following steps are automated:
5. Once the temperature is above 340 °C for 1
minute (to allow the lead temperature to equalize),
the cooling sequence will be initiated so that the
eutectic temperature can be detected.
6. The system will attempt to automatically detect the
eutectic temperature of the lead by lowering the
temperature below 327.5 °C to a value of 310 °C.
When the temperature reaches 310 °C, a popup
display will appear. It will inform the operator if the
eutectic temperature detection was successfully
detected or if it failed. If it was successful, the
temperature detected will be displayed and the
date it was detected and stored will be displayed.
The stored low temperature point from step 5 and
the eutectic temperature will be moved to the
thermocouple calibration factors until the next time
an auto calibration is initiated.
7. If the eutectic temperature was successfully
detected, push the 'OK' button on the popup
display. This will cause the popup to disappear.
The temperature will increase to melt the lead for
thermocouple removal. A message is displayed
notifying the operator to remove the thermocouple
from the lead once the temperature reaches
>330 °C. A one minute timer is started to allow
thermocouple removal.
8. Once the one minute timer has completed or
the thermocouple has been removed, heating
is stopped. The operator must remove the
thermocouple from the lead at this time and
clean the thermocouple with a cloth to remove
any residual lead on the thermocouple. Dispose
of the cloth properly. Wear appropriate gloves
when handling the hot thermocouple with possible
lead residue.
9. An eight minute timer is initiated to allow for the
lead cup assembly to cool. Once the eight minutes
has been completed, the cooling is stopped.
Section 7: Calibration
10. If the eutectic temperature capture was not
successfully detected, a popup message
will display a failure and abort the calibration
procedure. It is suggested that the test be
repeated to confirm that the thermocouple is
defective. Push the 'OK' button on the popup
display for a one minute heating cycle to begin to
allow for thermocouple removal (as described in
step 7). Remove the thermocouple and inspect
it for damage. Allow the lead calibration check
assembly to cool. Repeat the calibration.
11. If the thermocouple fails to capture a satisfactory
eutectic temperature detection again, it should
be replaced. The new thermocouple should be
calibrated.
Thermocouple Hi Check Screen
Figure 67

7.2 Differential Pressure

1. Falex 400 must be on for at least 30 minutes
before following this procedure.
2. Fill the calibration bottle ¾ full with fuel.
3. Be sure the sample out line is in place and
empties into a beaker. The aeration and sample in
lines can remain in place or they can be closed by
attaching nuts to the bulkhead fittings.
4. The heater tube and prefilter assemblies are not
used for this calibration and need to be removed.
Place a nut over the bulkhead where the prefilter
assembly attaches to the unit. Cap the DP+
bulkhead but leave the DP- port open.
5. Get to the DP Calibration screen from the Main
screen by the following sequence of buttons:
Maintenance > Calibration > Diff Press.
6. Upon entering the DP Calibration screen, press
START.
40
Real-Time
Temperature