JULABO KRC 180 Refrigerators for chemicals - Manual (Page 4)

Intended use
4
1. Intended use
JULABO refrigerators for chemicals are especially designed for cooling and storing
hazardous substances at a working temperature range of -2 °C to +12 °C.
JULABO refrigerators for chemicals are not suitable for direct temperature
control of foods and semi-luxury foods.
1.1.
DESCRIPTION
Chemicals should not be stored in commercially available refrigerators, which are neither
equipped with suitable, self-protecting control circuits nor guarded against overheating of the
cooling compressor.
JULABO refrigerators for chemicals are especially designed for cooling and storing
hazardous substances.
They are available in two sizes and provide the following advantages:
Interior free of ignition source
LED display of actual/selected temperature value
Removable control unit
Self-protecting control circuits
Seperate control and safety circuit
Bipolar shutoff in the event of a functional disturbance
Alarm output (with floating DPDT contact)
The KRC 50 and KRC 180 refrigerators for chemicals have been developed in research
laboratories for enhanced safety.
They are comprised of:
1. Electronics Module
Power supply with control and alarm circuits, permanently mounted on the rear of the
refrigerator.
2. Control Unit
Operating controls and display, with connecting cable to the electronics module; with
magnetic foil on rear; for mounting to refrigerator door or in special holder provided.
Functional Description
Temperature control is performed with a two-point control circuit. A PTC sensor in the
refrigerator interior is employed for temperature control and measurement.
The sensor and the selected temperature value are monitored by the control circuit with a
differential measurement technique.
An additional PTC sensor is employed for safety temperature measurement, monitoring the
capsule temperature of the compressor.