The Bar series sensors are compact, high-resolution pressure sensors for underwater pressure and depth sensing. The aluminum body uses the bulkhead penetrator form factor, so it’s quick to install in watertight enclosure and is ideal for use on ROVs, AUVs, and other underwater projects.

Two models are available to suit different applications:

The Bar02 is a low-pressure, ultra-high resolution sensor using the Measurement Specialties MS5837-02BA. It measures up to 2 bar (about 10 meters water depth) with a depth resolution of just 0.16 mm and can also measure in-air altitude with 13 cm resolution. This makes it ideal for shallow-water devices where a high level of resolution is required. It includes a temperature sensor accurate to ±2 °C and is supported in ArduSub 4.7 and later.

The Bar30 is a high-pressure sensor using the Measurement Specialties MS5837-30BA. It measures up to 30 bar (about 300 meters water depth) with a depth resolution of 2 mm, making it a great choice for deep-water ROVs and general underwater instrumentation. The built-in temperature sensor has ±4 °C accuracy, and is supported by ArduSub and other ArduPilot firmware.

Both sensors communicate via I²C, operate on 3.3 V logic (with 5.5 V max power input), and come with a JST GH connector compatible with most flight controllers, like the Navigator Flight Controller and Pixhawk autopilot. The electrical schematic and board layout are fully open-source, so you can adapt the design to your own projects.

These sensors use gel-covered sensing elements that must be dried for at least 2 hours each day to maintain accuracy. Long-term submersion may damage the sensor.