The leader in Silicon-On-Sapphire High Temperature Pressure Transducer Technology
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SEN-400 Mold Cavity Pressure & Temperature Transducers
Blow Molding, Compression Molding, Chemical Process, Injection Molding, Insert molding, RTM and SMC, LIM and RIM Structural Foam, Pultrusion Dies, Transfer Molding
Description

Sensonetics's Cavity melt pressure transducer uses the same Silicon-on-Sapphire sensing diaphragm that has proven itself in melt extrusion applications. The sensing diaphragm is manufactured from sapphire, a single-crystal aluminum oxide that is the hardest of the metal oxide crystals and is chemically inert. Sapphire is ideally suited to the plastic melt transducer application. It has a modulus of elasticity 30% higher than stainless steel and is 5 times more abrasion resistant than tungsten carbide. In fact, the only material that can scratch it is diamond. The high modulus of elasticity combined with the high gage factor of the piezoresistive strain gages results m virtually infinite fatigue (cycle) life. Single- crystal piezoresistive strain gages are epitaxially grown on the sapphire force collection diaphragm, forming a homogeneous, single-crystal, radiation- hardened structure. It can be exposed directly to process media and can withstand continuous operating temperatures to 750°F An optional silicon on-diaphragm RTD is available, providing excellent temperature measurement (+/-0.5°F) the melt isolated from the transducer mounting-well.

CAVITY MELT PRESSURE AND TEMPERATURE

PRESSURE and TEMPERATURE are the two IMPORTANT MEASURABLE PROCESS VARIABLES in molding processes. The use of mold cavity transducers assures complete mold fill-out when placed strategically in key mold cavity positions. Until now, good measurement tools were not available due to fatigue, lack of durability, and slow response time.

SENSONETICS patented Silicon-on-Sapphire cavity pressure transducers provide direct pressure measurement with faster than 500 microsecond response time. The sapphire diaphragm has infinite fatigue (cycle) life and will not wear out in abrasive melt applications. Its piezoresistive strain gage allows dynamic as well as steady-state pressures to be accurately measured without signal decay. The optional on-diaphragm temperature sensor provides cavity temperature information at the surface of the melt. Both of these parameters are especially important in thermo set molding applications, where maximum pressures and temperatures occur during the plastication process in the mold.

See Specification Data Sheet