Eppendorf Biological Shakers Innova 44R - Manual (Page 49)

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Biological Shakers Innova® 44/44R — Operating manual
To stop a program: You can abort a run any time by changing the program’s function to Off.
9.6 Mute the audible alarm
The Innova 44/44R shakers have an audible alarm that is activated under predetermined
conditions. It may be muted in the following way:
1. Turn the Control Knob until the SET screen is highlighted on the display. Click the Knob in to
work in this screen.
2. Turn the Knob to highlight the Mute mode (On), then click the Knob in. The field will flash.
3. Turn the Knob to change the setting to Off, then click the Knob to save this selection.
To reactivate the audible alarm at any time, repeat steps 1 – 3, reversing “off” and “on”.
9.7 Temperature offset calibration
The temperature probe and the temperature controller are calibrated together at the factory. The
temperature probe measures the temperature of the air at the probe’s location, near the return
vent. The controller uses the probe input to adjust air temperature, up or down, to match the
temperature setpoint.
Depending on various conditions within the chamber, such as flask placement and size, the heat
produced by growing organisms, heat losses due to liquid evaporation from flasks, etc., the
display temperature may differ from temperatures within the flasks themselves. You can calculate
the correction value for this offset and program the shaker to display a corrected temperature.
9.7.1 Calculate the offset value
If you wish to have the temperature display (“Indicated Temperature”) match the temperature at a
given point, or match the average of a series of points within the chamber (“Actual Temperature”),
proceed as follows:
1. Let the unit equilibrate at or near the desired temperature, then record the Indicated
Temperature.
2. Now record the Actual Temperature.
3. Calculate the temperature correction value using this formula: Actual Temperature – Indicated
Temperature = Temperature Offset Value.
4. To set the Temperature Calibration Offset, follow the procedure outlined in the next paragraph
below.
9.7.2 Set the offset
To set the temperature calibration Offset:
1. Use the Control Knob to enter the CAL screen (see Fig. 34 on p. 50).
2. Turn the Control Knob to highlight the current setting (0.0 in the sample screen above), then
click the Knob in. The current setting will flash.
3. Turn the Knob (left for negative settings or right for positive settings) to display the desired
setting. As you turn the Knob, each click represents one tenth of a degree Celsius (0.1 ºC).
4. When you reach the desired setting, click the Control Knob in to save the new value.
5. When the Temperature Offset is set to any value other than 0, the asterisk icon will appear
next to ºC in the DISP and SUMM screens.
Hint!
If you highlight an item, change it, but do not save your selection, after a few seconds the screen
will revert to its previous setting.
9
Operation