PAC Alcor JFTOT II Manual page 92

2.13 Lower the thermocouple into the well so that it
presses lightly against upper surface of the
solid Tin.
CAUTION: The thermocouple must be touch-
ing the Tin.
2.14 Press ENTER to heat the Tin. The tempera-
ture will increase as the Tin is heated. The
screen will display "Please wait" while the Tin
is heated. (If the thermocouple is already
inserted into the Tin, proceed to step 2.17.)
2.15 Adjust the COOLING FLOW to the center
of the green range (this corresponds to
38 +/- 8 L/h).
2.16 The temperature will increase to 262°C and
then the heater will turn off automatically. At
this time the screen will display the prompt
"INSERT THERMOCOUPLE".
Page 6
Varlen Instrum arlen Instruments Inc.
ENTER ENTER
EXIT
TOGGLE
STEP
PRINT PRINT
SCREEN SCREEN REFRESH
F1 F1 F2 F2 F3 F3 F4 F4 F5 F5 F6 F6
F7 F8 F9 F10
NOTE - If the depth of the Tin is not at least 5 mm,
refill the well with a new charge of Tin pellets in
accordance with the instructions in ROUTINE
MAINTENANCE in the Maintenance Manual.
Restart the AUTOCAL TC procedure.
2.17 Press ENTER to find the freezing point
2.18 The JFTOT will begin LOOKING for the
Carefully lower the thermocouple to the bottom
of the well, noting the total distance of travel on
the slide assembly scale. Raise it 2.5 mm. Be
sure the thermocouple is centered in well
before proceeding to the next step.
2.16.1 The heater stays on and controls the
temperature at 262°C for no more than
2.5 minutes. If the next step (2.17) is
not started within the 2.5 minutes, an
error message is displayed and the Tin
Calibration has to be repeated (Step
2.23).
(eutectic) of Tin (232°C). The heater will turn
off.
freezing point of the Tin. The current tempera-
ture of 254°C is used here as an example.
JFTOT II Calibration Manual Rev. C