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OEM pressure sensor - Model PU1M

OEM pressure sensor PU1M

Product description

Featuring a 19 mm (~3/4”) diameter and a 15 mm (~6/10”) thickness, the PU1M model is the most versatile and the most robust OEM pressure sensor in our product range. It utilizes the latest technologies to provide a highly-accurate, stable and reliable pressure measurement. The larger diaphragm accommodates wider temperature ranges than small diameter counterparts. The thick and sturdy design which has been optimized for the pressures it is dedicated to, protects the internal parts from the external environment and makes it less sensitive to possible harsh constraints.

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.


Physical characteristics
Pressure range 0 to 2 bar through 0 to 20 bar
Pressure type ✔ absolute ✔ vented gage ✔ sealed gage ✔ compound
Vacuum possible, down to 1 μbar absolute
Safe overpressure 1.5 x
Burst pressure 2 x
Environmental characteristics
Storage temperature -40 to 125°C
Operating temperature extremes -40°C, 125°C
Maximum operating temperature span 160°C
Ambient temperature -40 to 125°C
Electrical characteristics
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
Mechanical characteristics
Electrical connections pins, leads, wires, connector
Mechanical connections ⌀19mm
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
Linearity ±0.25%FS ±0.25%FS ±0.05%FS
Hysteresis ±0.005%FS ±0.005%FS ±0.005%FS
Repeatability ±0.005%FS ±0.005%FS ±0.005%FS
Zero offset ±20mV ±2mV ±2mV
Span offset ±0 ±0 ±0
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.