Techne DB200-3 - Manual (Page 23)

23
SETTING THE TEMPERATURE UNITS
1. Press the Up arrow and Down arrow buttons together to toggle between °F and °C.
Note: When the unit is tuned off, on subsequent power-up the units will revert to °C.
SETTING THE OPERATING TEMPERATURE
1. To display the set temperature on the digital display, press and hold the set/reset button.
2. To adjust the set temperature, press the set/reset button and hold it while pressing the Up or
Down arrow buttons. Each press of the Up arrow or Down arrow buttons will increase or
decrease the set temperature by 0.1°C. If the buttons are held down the temperature change
will accelerate to 20°C per second.
3. When the set/reset button is released, the current heater temperature is displayed.
4. The heater indicator will flash if the new set temperature is higher than the current heater
temperature and will continue to flash to show that the unit is controlling the temperature.
5. The heater indicator will turn off if the new set temperature is lower than the current heater
temperature and will only start to flash when approaching the set temperature.
6. For optimal accuracy, allow the block inserts to equilibrate to the set temperature for about 30
minutes.
DB100/2TC
The model D100/2TC accommodates 2 aluminium blocks with independent temperature controls so
that each block may be set to a different temperature. The operation of the controls for each block is
as described above.
If using this model with only one block in place, the side with no block should have its set temperature
adjusted to 30°C.
Note: Due to variations in heat losses with different designs of insert block, the actual temperature
may vary. The units are calibrated using model F3506 insert blocks. If you need to control the
temperature to a greater accuracy than the instrument’s set point, place a thermometer in a
designated hole in one of the blocks. For greater accuracy still, you can place a thermometer in the
sample liquid in one of the test tubes.
In either of these cases, it may be necessary to readjust the set temperature to achieve the precise
temperature required. Allow the temperature of the unit to stabilise after each adjustment. There will
be a time lag between the heater plate and the insert block achieving the set temperature due to the
thermal contact between them.
SETTING THE TIMER
1. To set the timer, press and hold the timer button and press the Up or Down arrow buttons.
Each press of the Up arrow or Down arrow buttons will increase or decrease the set time by 1
minute. If the buttons are held down, the time change will accelerate to 200 min per second.
2. Release the timer button to activate the timer. An audible beep will be heard once the timer is
activated.
3. When the count-down time has completed, an audible beep will be heard and the display will
show the word ‘End’ alternatively with the current heater temperature. Press the set/reset
button to cancel the beeper. The unit will start to cool to ambient once the count-down time
has completed.
4. To stop the timer at any point during the count-down period, press and hold the set/reset
button or the timer button until the word ‘Stop’ appears and an audible beep is heard.