Oil Cavity Volumetric Expansion Mitigation in Piezoresistive Transducers
Minimizing fluid volume below five microliters and matching diaphragm spring rate eliminates thermal zero shift in isolated piezoresistive pressure cells.
Halocarbon Fluid
Chemical Inertness
A fully halogenated synthetic liquid serves as a non-reactive transmission medium in high-hazard pressure sensors. Utilizing halocarbon fluid in these sensors ensures that the fill fluid will not react or ignite when exposed to strong oxidizing agents or corrosive chemicals. This inertness is necessary for industrial processes that involve hazardous or highly reactive substances.
Oxygen Service
In systems that transport pure oxygen, standard hydrocarbon and silicone fill fluids present a severe fire risk if a diaphragm rupture occurs. If a leak happens, the halocarbon fluid will not combust, preventing catastrophic failures and explosions. This makes it the industry standard for oxygen and chlorine measurement devices where safety is paramount, ensuring that the sensor does not become a source of ignition during a primary containment failure.
Viscosity Profile
Fluorinated fluids have a relatively high density and a viscosity that changes with temperature, which can affect the response time of the sensor. In very cold environments, the high viscosity can slow down the transfer of pressure, causing a lag in the output signal. Engineers must account for this behavior when designing systems that operate across wide temperature ranges.
Application Limit
Although highly stable, the fluid is heavier than standard oils, which introduces a static head effect that must be compensated for during calibration. This weight can cause a zero shift if the transmitter is mounted horizontally instead of vertically. Calibration technicians adjust the zero point after installation to eliminate this position-sensitive offset.