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4. Function
4.1 Construction
4.2 Description of functions
4.3 PT series
4.1 Construction
The PTs of series MDT 420 x/460 x are industry standard.
The main advantages are:
- manufactured under ISO 9002
- thermal stability
- resistance to aggressive media
- insensitivity to electromagnetic radiation (EMC)
- liquid-filled transmission system (mercury)
- pressure measurements in plastic melt up to a temperature of 400°C (750°F)
- maximum pressure 2000 bar
4.2 Description of functions
Through a closed, liquid-filled pressure transmission system, the PT furnishes
an electrical signal that is proportional to the pressure of the melt.
The pressure applied by the medium is forwarded to the measuring diaphragm via the
separating diaphragm and the transmission medium (standard configuration:
mercury) in the capillary. The deflection of the measuring diaphragm changes the
resistance of the strain gauge bonded to the measuring diaphragm. The strain gauge
is a Wheatstone bridge.
An electric signal proportional to the pressure is generated via the supply voltage.
