Humidity Cabinet
39-1300, 39-1601
3
9907X0093 Issue 3
1
General Description
The cooled laboratory humidity cabinet provides the user with extremely accurate and
safe temperature control over a wide temperature range.
1.1
Heating
Low wattage heaters are attached to the outer surface of the inner chamber in such a
manner as to ensure even heating throughout the chamber.
1.2
Cooling
Direct expansion coils are coupled to a hermetic condensing unit via a solenoid valve.
When the refrigeration switch is switched on, the compressor will run continuously.
The coolant flow is controlled by a solenoid valve, which is electronically opened and
closed by the temperature controller.
1.3
Temperature Controller
The temperature is accurately controlled by a Jumo dTRON 316 microprocessor
temperature controller. The controller uses the signal from a PT100 sensor located in
the chamber to control the current supplied to the heaters. The temperature can be
easily adjusted. See Section 3 for details.
1.4
Over / Under Temperature Safety Cut Out
A TLK38 digital cut out protects the contents of your incubator by allowing you to
program over & under temperature safety cut out set points. When the chamber
temperature goes out of limits, an audible alarm and visible red neon will bring to your
attention any problems. Reset buttons are provided below the cut out for you to
manually reset the out-of-limit system.
1.5
Circulating Fan
Air is drawn up through the chamber by a circulating fan located in the top and
returned to the base via a full width duct at the rear of the chamber. A door micro-
switch stops the fan when the door is opened.
