10
Calibration
6.1.
The device is precalibrated at the factory (calibrating coefficient is 1.000) for operation
with temperatures measured by a sensor in the heating block.
6.2.
To change the calibration coefficient, hold the
RUN/STOP TIME
key (fig. 1/7,
CH-
100
) or
Start Stop
(fig. 2/7,
CH 3-150
) key pressed for more than 8 s to activate
calibration mode. The calibration mode appears on the display (fig. 3).
6.3.
Restoring factory settings.
Set 1.000 value using the ▲ and ▼
Temp
or
T (ºC)
keys as shown on fig. 3/1 to restore the factory settings. Press the
RUN/STOP TIME
or
Start Stop
key once to save the changes and exit the calibration mode.
Note.
For model
CH 3-150
, coefficient value changes are recommended
after the unit has reached 30°C temperature.
6.4.
Calibration procedure.
6.4.1.
Install independent sensor (0.5°C accuracy) into microtubes placed into the block
sockets.
6.4.2.
Set the required temperature in operation mode (e.g. 40°C).
Fig. 3. Control panel in calibration mode
6.4.3. After the unit reaches the set temperature (when the set and current temperature
readings equal) leave the unit for 30 min for thermal stabilization.
6.4.4.
Let us assume that the readings of independent sensor is 39°C, but the display’s
actual temperature is 40°C (fig. 3/4). Then it is necessary to add 1°C correction.
6.4.5. Hold the
RUN/STOP TIME
or
Start Stop
key pressed for more than 8 s to activate
calibration mode. The following parameters will be shown on the display (fig. 3).
6.4.6.
Using the ▲ and ▼
Temp
or
T (ºC)
keys, change the calibration coefficient (fig. 4/1)
so that the new temperature value (fig. 4/2) corresponds to the independent sensor
temperature. In our example, the calibration coefficient will be 0.974.
Note.
Calibration coefficient can be changed in range from 0.936 to 1.063
with increment of 0.001. This calibrating coefficient will correct
temperature through all the operation range of the block.
Note.
For model
CH 3-150
, coefficient value changes are recommended
after the unit has reached 30°C temperature.
6.4.7. After finishing the calibration, press the
RUN/STOP TIME
or
Start Stop
key once to
save the changes and exit the calibration mode.
6.4.8. The display will show calibrated temperature as shown on fig. 5/1 and the unit will
continue thermal stabilization according to the previously set temperature.
Содержание CH 3-150
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