Ceramic-packaging approach delivers greater reliability in harsh-media environments and lower cost

By Heather Hamilton, contributing writer

Photo
courtesy of DunAn Sensing.

DunAn Sensing recently
unveiled two new series of pressure transducers designed to operate in harsh
environments. The MEMS DURAsense Core (MDC) Series of harsh-media-compatible
pressure transducers uses proprietary packaging and MEMS pressure sensor
integration, which the company claims results in highly accurate pressure
outputs in small spaces at a low cost.

While
many sensors use a metallic diaphragm and cavity filled with oil, the pressure
transducers use what the company calls the “core,” a ceramic-packaged button
module, to mount the MEMS piezo-resistive pressure sensor. The button uses media-compatible,
rear-entry packaging, which eliminates the contact of bond wires and electrical
signals to the media. This makes the sensor more reliable and allows it to
operate in conductive media.

Because
the sensor is eutectic-bonded to the ceramic substrate, it is suitable for
harsh environments, enhancing reliability and avoiding potential delamination.
An ASIC mounted on the PCB provides signal conditional and performance
compensation. Available in pressure ranges from 0–15 and 0–750 psi in absolute,
gage, and sealed gage, these devices can be used in a variety of applications.
These include pumps, hydraulics, pneumatics, valves, and handheld measurement
devices. For complete specs, check out the datasheet.

The
MDC Series is priced at $48.18 in quantities from 1 to 499. Evaluation devices
are available from stock.

And,
because good things come in twos, DunAn Sensing also released its Ceramic
Diaphragm Core (CDC) Series of harsh-media-compatible pressure transducers, which
uses a proprietary Al2O3 ceramic diaphragm with
thick-film resistors and an ASIC to digitally trim for compensation and
calibration. The pressure transducer offers highly accurate pressure
measurements up to 3,000 psi. The devices are small, accurate, and low-cost,
making them well-suited for harsh environments like water and refrigerants.

Like
the MDC series, it uses the “core” media-compatible packaging strategy. It’s
also available in seven pressure ranges from 0–150 to 0–3,000 psi in gage
format, addressing a variety of applications including pumps, hydraulics,
pneumatics, valves, and handheld measurement devices. For full specs, see the datasheet.

The CDC series is priced at $48.19 for
quantities from 1 to 499. Evaluation devices are available from stock.