Electric air heaters are employed to preheat air and gases in the
chemical and pharmaceutical industries. In process engineering, set
process temperatures are often required, for example when paper webs are
dried in printing machines, vessels and solvent containers are dried
with hot air after cleaning, or reactions are initiated with streams of
When the pressure of a gas is reduced, its adiabatic expansion is
accompanied by a fall in temperature, which can be calculated from the
ideal gas equation (Tompson effect). In order to prevent ice forming in
valves, fittings and piping, the gas stream is heated up prior to the
reducing valve by the calculated temperature difference required. We
supply the explosionproof heaters together with pressure vessels up to a
maximum pressure rating of 150 bar. This not only ensures safe
operation but also guarantees the greatest possible availability of the
gas. The pressure vessels of course comply with the requirements of the
Pressure Equipment Directive 97/23/EC and the AD 2000 Code drawn up by
the German Pressure Vessel Association.
Various concepts are available for heating liquids. Flanged heaters
with welded-in heating elements are manufactured with flameproof
enclosures and terminal boxes with increased safety 'e' type of
protection. Large storage vessels are equipped with heaters whose
heating element can be exchanged without draining the vessel. For
applications requiring particularly small dimensions, heating elements
with a diameter of 12.8 mm, connected at one end, can be used.
Our thermal fluid units are available for heating reactors. These are
designed as complete systems, consisting as a rule of a pump, an
electric heater, possibly a cooler, an expansion vessel and the
Our complete series of PID temperature controllers is designed for
incorporation into explosionproof control units. An intrinsically safe
remote control system permits operation from outside the hazardous area.
The temperature sensors with Zener barriers provide accurate results,
since the software compensates for the internal resistance.