OEM pressure sensor - Model PU7M
With a 15 mm (~5/8”) diameter and a 5 mm (~2/10”) thickness, the PU7M model is a miniature OEM pressure sensor, one of the smallest in our product range. The design has been optimized for the pressures it is dedicated to.
The sensor integrates a solid-state, piezoresistive MEMS silicon die which acts as the sensitive element and converts pressure into an electrical signal. Using advanced techniques of MEMS fabrication (like wet etching, anisotropic etching), a thin diaphragm is crafted inside the silicon die. The thickness of the diaphragm is individually adapted to each pressure range so as to get the highest possible sensitivity without breaking under full pressure load.
Thanks to the monocrystalline structure of the silicon, the pressure sensor exhibits no measurable hysteresis and provides an excellent repeatability, making it highly reliable and highly precise over years of operation.
Besides being very cost-efficient and well-suited for mass production, the silicon monolithic structure withstands overpressures to twice the pressure range without damage or effect on the future performance of the sensor and has a life expectancy of tens of millions of cycles. The sensor is also highly sensitive, exhibiting a high signal with a low power excitation, which is ideal for battery-operated systems.
For protection against media and for ease of integration, the silicon die is mounted and wire-bonded on a glass feedthrough (header) and integrated into a high quality, hermetically-sealed, fully-welded 316L stainless steel enclosure. The housing is filled with a silicone oil and closed by a very thin 316L stainless steel diaphragm, both reliably transmitting the pressure to the die while isolating the latter from the media.
Each sensor is individually tested under various harsh environments and conditions as part of our stringent quality procedures. Each sensor must pass all tests in order to be delivered. An individual calibration report can be delivered with the sensor upon request.
|Pressure range||0 to 5 bar through 0 to 20 bar|
|Pressure type||✔ absolute ✔ vented gage ✔ sealed gage ✔ compound|
|Vacuum||possible, down to 300 mbar absolute|
|Safe overpressure||1.5 x|
|Burst pressure||2 x|
|Storage temperature||-40 to 125°C|
|Operating temperature extremes||-40°C, 125°C|
|Maximum operating temperature span||120°C|
|Ambient temperature||-40 to 125°C|
|Power supply / excitation||between 0.5 mA and 2 mA (1 mA typ.)|
|Typical output signal||0 ~ 150 mV|
|Bridge resistance at 25°C (77F)||between 2.5 kΩ and 4.5 kΩ|
|Electrical connections||pins, leads, wires, connector|
|Materials available||316L Stainless steel, Hastelloy, Titanium|
|Seal materials available||FKM, EPDM, Silicone, NBR, Kalrez, Buna-N|
|Performance (depending on temperature compensation range)|
|Type of compensation||uncompensated||resistors||polynomial|
|Compensated temperature range||-||-10 to 80°C||-10 to 80°C|
|Temperature drift of Zero||±0.25%FS/K||±0.01%FS/K||±0.01%FS/K|
|Temperature drift of Sensitivity||±0.03%/K||±0.03%/K||±0.03%/K|
|Stability (per annum)||±0.1mV||±0.1mV||±0.1mV|
All values are typical values.