Pre-Selection; Pre-Selection Of Speed / Rcf-Value; Pre-Selection Of Running Time - Hermle Z 307 User Manual

2.3 Pre-Selection

2.3.1 Pre-Selection of Speed / RCF-Value

Selecting the key, "rpm/rcf" (4), pre-selection is activated. By pressing the key once, the word "rpm"
(M5) flashes. By pressing the key again, the pre-selection of the centrifugal forces can be chosen. The
flashing word, "rcf" (M6), will appear. The desired values can be selected, with the control field (1). In
the display (A-1), the regulated value is shown permanently: before, during and after the run.
For all number marked text, please refer to Figure 22.
Figure 22
As long as no rotor is inserted, the speed is adjustable between 200 rpm and the maximum revolution
of the centrifuge.
If there is a rotor in the centrifuge, the speed can only be pre-selected up to the maximum permissible
revolution of that rotor. It is the same with the pre-selection of the RCF-Value. The setting range is
between 20 xg and the maximum permissible centrifugal force of the rotor.
See Table 4: Max. Speed and RCF-Values for Permissible Rotors", (see APPENDIX P. V). All
important values are listed on this table.
ATTENTION:
Please check the maximum permissible revolutions of your test tubes! (Producer Indication)

2.3.2 Pre-Selection of Running Time

The running time can be pre-selected in 3 different ranges: from 10 seconds up to 99 hours 59 minutes.
1. Range from: 10 seconds up to 59 minutes 50 seconds, in steps of 10 seconds
2. Range from: 1 hour up to 99 hours 59 minutes, in steps of 1 minutes
3. Range: Continuous Run "cont", can be interrupted by the key, "stop" (10).
The running time can be pre-selected, with the lid opened or closed.
To activate the setting of the running time, press the key "time" (6).
In the display, "time" (A-3) flashes the indication: "m : s" or "h : m", depending on the previous
setting.
To set the desired value, use the control field (1). After exceeding 59 min 50 sec, the indication
changes automatically to, "h : m". After exceeding 99 hours 59 min, the word "cont" appears in the
© Hermle Labortechnik GmbH Z307_V1.22_eng
OPERATION
17