Theory of Operation
1-2 Low Temp Incubator Thermo Scientific
Section 1
Installation and Start-Up
The incubator is commonly referred to as the standard model 815.
The Model 815 Low Temp Incubator has been designed to provide the
ultimate in temperature control. The user is assured of dependable and
precise performance through the use of microprocessor technology in the
temperature control circuitry. This incubator is operable in the range of
-10° to 50°C. These temperature ranges will meet a wide variety of
applications, such as BOD determination, general incubation, as well as
the preservation of critical materials.
Heat-Up Time: From -10°C to 50°C; 120 minutes (Compressor "ON");
Cool-Down Time: From 50° to -10°C; 100 minutes.
Note The above performance figures are based upon the following
operating conditions: Line Voltage ............... 110.5 to 112.5
Ambient Temperature ... 22.5° to 24°C
The refrigeration system, defrost heater, and air circulating fan are used in
conjunction with a microprocessor controlled proportioning circuit to
achieve sensitive temperature control. An RTD (Resistance Temperature
Detector) located in the airstream senses any temperature deviation from
the control point, and heat is provided proportionally to maintain the
desired temperature. Regardless of what temperature is being maintained,
the compressor operates continuously. This constant operation alleviates
component failures associated with cycle type operation.
The circulating fan provides even air distribution throughout the chamber
and ensures temperature uniformity.
General Information
Performance Data
Temperature Set Point (°C) Uniformity (±°C) Temperature Sensitivity
-10.0 ±0.9
±0.1C
20.0 ±0.5
37.0 ±0.5
50.0 ±0.
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