Pre-Selection Of Temperature; Pre-Cooling - Hermle Z 446 K User Manual

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OPERATION

2.3.4 Pre-Selection of Temperature

This function is activated by the key, "temp" (13). After pressing the key, in the display "temp", flashes

the indication, "°C" (A-4). With the adjustable knob (1), the desired test temperature can be pre-

selected, in steps of 1°C in a range from: -20°C to +40°C.

The value is indicated permanently in the display, (Figure 21) - before, during and after the run.

Please notice the respective lowest temperatures of the rotors, at maximum speed!

Figure 21

If the samples are "temperature sensitive", it is critical to pre-cool the centrifuge, the rotor and

eventually the buckets, to the needed working temperature. Therefore, insert the desired rotor and

pre-set the respective temperature. By simultaneously pressing the keys, "temp" (13) and "time" (6),

the run will begin. While the unit is running, it automatically choose a rotational speed that is

equivalent to 20 % of the permitted rotational speed, of the respective rotor. After the pre-set

temperature is reached, you can opt out of the pre-cooling run, with the "stop" key (10).

Depending on the inserted rotor, the pre-cooling lasts between 10 to 20 min.

For all number marked text, please refer to Figure 22.

Figure 22

Z446K_V1.22_eng

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