Section 1
1.1 INTRODUCTION
The LMS programmable option for Cooled Incubators is controlled by a powerful
versatile programmable controller which is designed to offer the highest functionality
and will enable the user to set up and run a complex process relying upon the LMS
reputation for accurate temperature control.
The programmer function is able to control applications needing set point changes
over time. Examples of this are ramp changes where a gradual rate of change can be
set or step changes which are instantaneous. These can be separated by soak
periods during which the process is held at a constant value. Each individual time
interval of the program, or segment, together with its associated moving set point
value, can be stored as a unique program.
At the end of a sequence, a program can be arranged to repeat (or loop), either a
specified number of cycles, or continuously.
For safety reasons, three modes of recovery from power failure are available. These
automatically re-start the program from the beginning, continue it from where it
stopped or hold it, waiting for the user to re-start.
Of course the controller can also be set manually for quick and easy single set point
temperatures if required.
1.2
CONSTRUCTION
The outer casing of all models in Series 1A, 2 and 3 is of sheet steel finished in white
stoved enamel. Models in Series 1A have an internal liner of white pre-coated
Aluminium. The internal liner of models in Series 2 is of a high impact vacuum
formed plastic with a minimum of crevices, and all corners are radiused. Models in
Series 3 have an unobstructed working space fabricated from brushed stainless steel
complete with multi position plastic moulded shelf supports, which allow the three
white plastic coated steel shelves to be randomly positioned to suit individual
requirements. Series 4 models have both a stainless steel exterior and interior and
are supplied with 5 stainless steel shelves (model 600) and 10 stainless steel shelves
(model 1200).
Foam insulation is used, to ensure maximum insulation against external ambient
temperature.
All ranges of LMS cooled incubators incorporate both a door lock and magnetic
gasket with all control features being set into a control panel and positioned so as to
minimise the risk of accidental alteration.
1.3
TEMPERATURE CONTROL
The temperature control method utilises a programmable controller offering digital
selection and readout of temperature. See section 2.3 for operation.
1.4
COOLING
Cooling is provided by a hermetically sealed refrigeration system. All LMS Cooled
Incubators comply with the latest CFC-free regulations.
1.5
AIR FLOW
A full air flow system is used. The airflow being at low velocity but high volume.
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