© Thermo Hybaid. Issue 1.0, January 2002
66
New Temperature
A new temperature may be specified during a manual
incubation step. The manual program is interrupted and the
sample temperature rapidly changes to the newly specified
temperature.
Peltier Device
A thermoelectric device incorporating a bismuth telluride semi-
conductor crystal array. On passing a current through the
crystal, one surface of the crystal is heated, the other cooled.
Reversing the current reverses the heat flow.
Power Failure
The Px2 has the facility to restart after a mains power supply
failure. There are two set up options for restarting after a
power failure:
1. Resume program at step that power failure
occurred.
2. Abandon program at power failure step.
One of the above should be specified using the SETUP menu.
PROGRAM
Select PROG from the main menu to access the programming
menu.
Ramp Rate
(Temperature Ramping)
Ramping precisely controls the rate of change of sample
temperature (ºC/sec). This is useful for limiting the rate of
change of temperature, to allow partial extension of short or
degenerate primers.
RUN
The RUN Option allows the user to run a stored program on
the block
Sample Volume
When using simulated tube control methods, the sample is
entered to ensure precise block heating and cooling.
SET UP
This function allows the default settings of the Px2 (set day and
time, power restart option and screen brightness) to be
modified.
Simulated Plate Control
Simulated Plate Control incorporates an algorithm to reduce
time to reach target temperature, using precise overshoots in
block temperature for each setpoint. Refer to Section 5.2 for
instructions on how to use this control option.
Simulated Slide Control
Simulated Slide Control incorporates an algorithm to reduce
the time to target temperature when performing temperature
cycling reactions using microscope slides on an
In Situ
block.
Simulated Tube Control
Simulated Tube Control incorporates an algorithm to reduce
the time to reach target temperature, using precise overshoots
in block temperature for each setpoint. The calculated sample
temperature inside sample tubes and block temperature are
displayed during the run.
Stage
One stage of a program consists of one or more steps up to a
maximum of 10. A stage may be repeated for temperature
cycling. Up to ten stages may be used in one program, and
stage-to-stage linking is automatic.
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