
TOPwave
Device Description
17
4.2
Temperature Control
The TOPwave is equipped with a temperature monitoring system. This system deter-
mines the temperature
inside
the pressure vessels by measuring the direct infrared radi-
ation emitted by the sample. This allows the temperatures of all samples to be deter-
mined. This information is forwarded to the power control module which uses the hig-
hest measured temperature to regulate the oven power. Continuous adjustment of the
magnetron output allows the temperature regulation on the base of all vessel contents.
For measurement instrumentation reasons, only temperatures above 50 °C (122 °F) can
be displayed. Temperatures below 50 °C (122 °F) are indicated on the display by “low”.
1
Infrared filter
2 Measurement sensor
4.3
Pressure Monitoring (Option)
Optionally, TOPwave can be equipped with a pressure monitoring system. To achieve
this, the pressure in the vessels is determined by using polarized light to measure any
change in the photoelastic behavior of a glass ring in the vessel lid. This allows the inter-
nal pressures of all or of individual vessels to be detected. This information is conveyed
to the output control module, which can use the highest measured pressure to regulate
the output. By continuously adjusting the magnetron output pressure regulation refe-
renced to individual vessels can be achieved while preventing other over-pressure safety
devices (rupture discs) from being activated.
1 Polarized light
2 Glass ring
3 Optical sensor
4 Internal pressure