7
A shift can be entered into the controller by pressing the scroll (left-hand)
button. Press and hold either the up or down arrow button (
˄˅
) to
change the shift value. A factory set value will be entered at the time of
certification. The shift value should only be adjusted if the unit is being
monitored by an ETI Reference Thermometer or similar.
All other functions of the controller have been factory set and locked to
maintain accuracy and repeatability.
OPERATION
DRY-WELL SET-UP
Place the dry-well unit on a flat level surface with at least 150 mm of
space in front and behind. The stand may be swung out to lift the front
of the unit. Plug the power lead into a suitable grounded AC power
outlet socket. Check for and remove any foreign objects prior to switching
on. Turn the instrument on using the switch located on the rear panel,
below the power lead. The fan will start immediately and the controller
display will illuminate after approximately three seconds.
TEMPERATURE SETTING
The dry-well may be set to any temperature between 33 and 300 °C in
0.1 °C increments (see 3.1.6 Temperature Controller for details). The
control will cause the unit to heat to the set point temperature. A control
indicator light will show in the top left corner of the display when the
heater is active. The dry-well temperature is displayed in operation. A
small overshoot and undershoot will occur when the well reaches the
set point temperature. Ten minutes are normally required to reach a
higher set point temperature. It will take longer to reach a lower set point
temperature. Once the set point temperature is reached a further ten
minutes should be allowed to achieve stability. For optimum accuracy
and stability allow the unit to warm up for 30 minutes after power up.
The displayed well temperature should stay within ±0.5 °C of the set
point temperature.
PROBE TESTING
Insert the probe to be tested into one of the holes in the dry-well. The
probe should be a snug fit for good heat transfer but should not be so
tight that it cannot be removed easily. Best results will be obtained when
the probe is inserted to the full depth of the dry-well hole of closest size
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