© Thermo Hybaid. Issue 1.0, January 2002
38
Block Control
Controls block temperature as on a conventional dry block machine. We do not recommend this
means of control for thermal cycling due to the variability in thermal profile obtained with different
sample volumes and consumable types.
6.5 Heated Lid Preheat
Once a program and block have been selected (and calibration factors entered where appropriate) the
program will proceed according to the setup conditions as outlined below. The heated lid typically
takes around 2 minutes to reach operating temperature. During this time, the block is controlled at
4
°
C.
WARNING:
Both the tops of reaction vessels and the surfaces of the heated lid
assembly (in particular the inner surfaces) can become very hot during normal
operation. Touching the surfaces can cause burns. Do not touch the heated plate
without safety gloves.
Heated Lid - Automatic Start
This should be selected for robust cycling reactions, where the reactants can withstand being
incubated for the duration of the preheat (about 2 minutes) without the generation of spurious
products. After the program is selected, the Lid Heating indicator light will switch on, denoting
preheating of the lid. When the lid reaches operating temperature, the Ready/Working indicator light
will change to green and the temperature cycling will start automatically. In this mode, samples should
be loaded and the lid closed
before
starting the preheat.
Heated Lid - Manual Start
This should be used for sensitive cycling reactions, where the reactants will not tolerate being
incubated at low temperatures even for a short time, or where all risk of non-specific reactions must
be eliminated. After the program is selected, the Lid Heating indicator light will switch on, denoting
preheating of the lid. When the lid reaches operating temperature, the Ready/Working indicator light
will change to green. An alarm will sound (if activated) and the
START
key will need to be pressed
to start temperature cycling. In this mode, samples should be mixed, loaded and the lid closed
after
the preheat is completed.
If, after 90 minutes, the
CONTINUE
key has not been pressed to start a program, a manual start
time out screen is displayed and the run is cleared.
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