Tabla de contenido
T E C A L 1 4 0 S O P E R A T O R ' S M A N U A L
Setting the units for temperature
The unit will normally be set to display in °C, if you require it to work and
display in °F press both the UP ARROW and DOWN ARROW buttons at the
same time. To convert back, press both buttons again.
Setting the Operating Temperature
1.
2.
3.
4.
Water Cooling
An extended temperature range to -40°C can be achieved on the Tecal 140
unit with a 4°C chilled water supply. The supply must have no more than 6
metres of water pressure head. However, the chilled water supply must not
be switched on when the set temperature is above 40°C as this can lead to
damage to the block. The cooling fan in the calibrator will automatically
switch off if there is a chilled water supply.
A Techne CH-5 chiller may be used to supply chilled water but in an ambient
above 20°C it may not achieve the lowest temperatures. Switch on the
chiller unit before the calibrator and allow the chiller to stabilise for 15
minutes before performing a calibration. After stabilisation, temperatures
between -40 and ambient can be set. Contact Techne's Sales Department
for details of the chiller unit.
Connect the CH-5, or the chilled water supply, to the calibrator using suitable
pipes and clips.
After Use
1.
2.
PAGE 12
To display the set temperature on the digital display, press and hold
the SET Temperature button.
To adjust the set temperature, press the SET Temperature button and
hold it while pressing the UP or DOWN buttons.
Temperature button is released, the measured temperature is
displayed (in degrees Celsius).
Power is switched on to the block (and the indicator comes on) if the
set temperature is higher or lower than the block temperature.
When the measured temperature approaches the set temperature, the
"power to the block" indicator will begin to flash. As the measured
temperature stabilises the indicator will stay on for shorter periods.
There will be a time-lag between the block and the insert achieving the
set temperature due to thermal contact between them. The display
may reach temperature in 2 or 3 minutes while the insert may take 5
minutes or more to reach temperature.
When you have finished heating samples, remember that parts of the
unit – inserts and associated accessories – may be very hot. Take the
precautions listed earlier. We recommend that the inserts should be
allowed to cool to 70°C before being removed from the Tecal unit.
They will still have to be handled with care
If you need to remove an insert while it is hot, fit the extractor tool into
the locating holes and lift the insert out carefully. Never leave the
extractor tool in the insert while it is being used in the Tecal unit.
When the SET
Tabla de contenido
