DunAn Sensing has announced here at the Sensors Midwest, the availability of its MP Series of harsh media compatible pressure transducers. The MP series uses DunAn Sensing’s proprietary DURAsenseâ unique packaging and microelectromechanical systems (MEMS) pressure sensor integration strategy with a hermetically sealed pressure fitting at a low cost while eliminating the troublesome and highly unreliable “O-ring” popularly used to seal the sensing element from its measured media. They are ideal for applications including HVAC, heat pumps, compressors, hydraulics, off-road vehicles and industrial equipment e.g. forklifts.
The MP Series is comprised of a ceramic substrate on which the MEMS piezoresistive pressure sensor is hermetically attached. The design utilizes a media compatible rear-entry packaging strategy for media contact with the Silicon sensor thus eliminating the contact of bond wires and electrical signals to the media which also enhances reliability and the ability to operate in conductive media. The MP Series hermetically seals the ceramic to a pressure fitting eliminating the problematic O-ring approach that has been adopted by many suppliers of pressure transducers. The adoption of an O-ring not only compromises the overall reliability of the design but creates major challenges and valuable time to the selection of the materials that will not be compromised by the media in which it must interface. DunAn Sensing’s approach significantly enables optimized sensor chip performance at reduced cost and with the highest level of reliability in the industry.
Additionally, this packaging approach provides improved reliability and performance at a lower price over those pressure sensors which use an oil-filled cavity and a metallic diaphragm. The pressure sensor ceramic is hermetically bonded to the pressure fitting which gives the series enhanced ruggedness and reliability and avoids O-ring problems due to incompatible materials. Signal conditioning for the pressure measurement and performance compensation is provided by an Application Specific Integrated Circuit (ASIC) mounted on a PCB.
The DunAn Sensing MP Series is available in pressure ranges from 0-15 to 0-750 psi in both absolute and sealed gage providing the designer with flexibility to address a wide number of applications. Device accuracy at 25-degree C (combined linearity, hysteresis and repeatability) is +/- 0.5% span. Accuracy over the -20-degree C to +125-degree C is +/- 1.5% of span. The MP Series guaranteed proof pressure of 3X rated pressure (maximum of 1500 psi) and burst pressure of 5X rated pressure (maximum of 2500 psi) insures trouble- free operation in the most demanding applications. These devices will provide OEMs with superior reliability, accuracy and affordability. Output signal is ratiometric 0.5-4.5 VDC (typical). Other electrical outputs are available; 4-20mA, 0-10VDC and 0-5VDC. The MP series body material is available in stainless steel or brass and is available in a wide range of mechanical interface (color coded) connectors to provide the designer with maximum flexibility in their system design. Their extended operating temperature range of -40-degree C to +125-degree C, rugged hostile media package and lowest price in the industry are ideal for applications including HVAC, heat pumps, compressors, hydraulics, off-road vehicles and industrial equipment e.g. forklifts.
The DunAn Sensing MP Series unit price is $69.00 in quantities from 1-499. Evaluation units are available from stock.
Filed Under: Sensor Tips, Sensors (pressure)