EYE on NPI – TE MS5839-02BA36 Digital Altimeter #EyeOnNPI #DigiKey @DigiKey @Adafruit @TEConnectivity

This EYE on NPI is looking forward to a dip in the local pool – thanks to the chlorine & water-resistant new MS5839 sensor from TE. We’ve been stocking TE sensors for a while, they’re even used in race cars! Check out this video we did with TE and Digi-Key about their partnerships.

This new sensor is an update on an existing, well-known MS5837, a water-resistant temperature and pressure sensor. This new version, the MS5839, adds chlorine-resistance, so it can be used for electronics that takes a dip. It’s specifically designed for use with swim watches and dive watches (lots of folks who train, or practice techniques in how to dive, like to practice in chlorine-pools). We think this would be great for UAV and environmental sensing projects.

TE Connectivity’s (TE) MS5839 is an ultra-compact digital altimeter that is optimized for applications where chlorine and saline are present. The robust, gel-filled design of the MS5839 enables operation in harsh media environments while providing accurate and reliable digital measurements. This MEMS-based sensor offers advanced water resistance, chlorine resistance, shielding, low power consumption, and digital interconnectivity in an ultra-compact, low-profile package. The board-level design delivers sensing accuracy for both pressure and temperature measurements.

Miniaturization, performance, and precision are key for sensors embedded in consumer devices like swim watches and diving equipment. Expanding on TE’s portfolio of ultra-compact digital altimeters, the MS5839 2-bar model is designed to meet the next generation of device manufacturer designs and challenges.

We like that this sensor has a stainless steel collar, which makes adding an o-ring for waterproofing super easy. Inside, you can see the white protective gel which allows outside air or water pressure to be transferred without exposing the sensing element itself. The O-ring can be used to protect the sensor against an enclosure for a small electronic device like a watch, or it can be part of a larger assembly that contains the sensor. We often see separate metal canister sensor for ROVs, like this one from Blue Robotics based on the MS5837.

You can also check out the chlorine test results in a separate app note, where they submerged a non-chlorine-protected sensor and an MS5839 40 times to test the resiliency. Another thing to note is that technically the sensor operates from a standard 300 to 1200 mbar. That won’t get you a very deep reading underwater, only about 2 meters. However, this sensor has an extended range up to 2000 mbar, that will give you a depth of 10 meter. Please note the error will rise as you get to higher pressures as the sensor is optimized to 1200 mbar.

The MS5839 is in stock right now and ready for you to integrate it into your design! Visit https://www.digikey.com/product-detail/en/te-connectivity-measurement-specialties/MS5839-02BA36/223-MS5839-02BA36CT-ND/11500143 and order today and you could have it in your hands by tomorrow!

Check out the product video below:


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