Device Description
TOPwave
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Device Description
4.1
Basic Unit
The TOPwave microwave system is designed for pressure digestion
at temperatures up to 230 °C (446 ° F) in continuous use and, depending on the type of
vessels employed, pressures up to a max. of 100 bar (1450 psi).
This is a top loading microwave made of 1.4301 (SS 304) stainless steel and equipped
with a swiveling safety lid, electromechanical locking mechanism and a circular sample
chamber for uniform microwave distribution. The oven has a highly chemicals resistant
PFA coating protecting it from corrosion. Three over-temperature switches and three
micro-switches guarantee the necessary operating safety. The chamber is permanently
ventilated by a special fan.
A RTM thermometer that permits the temperature of the vessel contents to be quickly
determined and regulated is integrated in the microwave oven. The measurement physi-
cally determines the temperature radiation emitted by the vessel contents, that is, the
digestion solution. Radiation components emitted by the vessel walls and, in particular,
the exterior of the vessel, are completely filtered out.
Optionally the system can be equipped with a contact-free, optical pressure monitoring
system for either individual or for all vessels. This records the internal vessel pressure. If
a vessel is approaching its maximum pressure, the system automatically switches to a
pressure-controlled mode for the microwave output.
An unpulsed regulated 2.45 GHz magnetron provides up to 1,450 W. The microwave is
controlled by a separate controller with touch-screen. After entering the desired tempe-
rature profile, the microwave output is infinitely varied in accordance with the measured
sample temperatures. The target and actual temperatures of all samples are displayed
on the screen in real time and saved to memory.
Basic Unit