Electric heating cabinets are basically equipped with electronic temp. controllers. A limitation of the temperature is always provided but can be selected if electronically or thermostatically effected. Electronic control-components (temp.-controller/-limiter) will be trigged via Pt100-sensors. 2 digital displays enable to read - continuously and simultaneously - the pre-set temperature and the actual temperature. By means of semi-conductor relay or power adjuster a very smooth temperature control can be achieved. This is a very essential condition for a homogenous spatial and temporal temperature distribution within the heating cabinet. The temperature distribution itself is depending on the interaction of all components, e.g. temp. control, air guidance, air-circulation, circulating flow rate, heating power and last but not least the arrangement of air-circulation and heating
Steam heated cabinets can be controlled thermostatically as well as electronically. With electronic temperature control it will not switched on and off the heating as it is with electric heating cabinets. Instead it will be actuated a steam control device (valve and actuator) in the steam-inlet tube. At thermostatically temp. control (opposite illustrated) the capillary-sensors are positioned within the airstream of the air-circulation. The measured temperature will be transferred to the steam control device by means of liquid expansion within the capillary sensor/-tube. Such controller-systems are especially advantageous for use in explosion endangered areas because there are no electrical components necessary. Thermostatically temp. controllers are not as comfortable as electronic ones in operation. So we preferably recommend the electronic controlled system - where ever possible.