The Bar30 pressure sensor is a high-pressure, high-resolution pressure sensor that is sealed from the water and ready to install in a watertight enclosure on your ROV or AUV. With 0.2 mbar resolution, it has an amazing depth measurement resolution of 2mm in the water column!
The sensor is the Measurement Specialties MS5837-30BA, which can measure up to 30 bar (300m/1000ft depth) and communicates over I2C. It operates on 3.3V I2C voltage but can accept power input up to 5.5V. It comes standard with a 4-pin DF13 connector that is compatible with most flight controller boards including the PixHawk and others. The Bar30 sensor is supported by default in ArduPilot and ArduSub so that it can be used on any ArduSub-controlled ROV like BlueROV2. We also have guides on how to use the Bar30 with Arduino and Raspberry Pi devices.
This sensor includes a temperature sensor accurate to ±1°C, with data also accessible through I2C. If you need something with more temperature accuracy, please check out the Celsius Temperature Sensor.
The anodized aluminum body was designed around the cable penetrator design and is compatible with all of the watertight enclosures.
We also have a 2-bar version of this sensor that can measure up to 10m water depth and a 100-bar version that measures up to 1000 m water depth. These sensors have similar designs and characteristics and are useful in many applications as well.
The electrical schematic and board layout are open-source and the design files are available in the Technical Details tab. Feel free to adapt to your own needs.
This sensor must be completely dried once per day or the pressure and temperature readings will drift.
Contents
- 1 x Bar30 Pressure Sensor
- 1 x O-ring
- 1 x Nut
Specifications
| Parameter | Value | |
|---|---|---|
| Electrical | ||
| Supply Voltage | 2.5 – 5.5 volts | |
| I2C Logic Voltage (SDA and SCL) | 2.5 – 3.6 volts | |
| Peak Current | 1.25 mA | |
| Mating Connector | Hirose 4-pos DF13 available on Digi-Key | |
| Pressure | ||
| Maximum Mechanical Pressure | 50 bar* | 725 psi* |
| Operating Pressure | 0 – 30 bar | 0 – 435 psi |
| Operating Depth | 0 – 300m | 0 – 990 ft |
| Relative Accuracy (0-45°C) | ± 200 mbar (204 cm in freshwater) | ± 2.9 psi (6.69 ft in freshwater) |
| Resolution | .2 mbar (2 mm in freshwater) | |
| Temperature | ||
| In Air Operating Temperature | -20 to +85°C | -4 to 185°F |
| In Water Operating Temperature | 2 to 40°C | 35.6 to 104°F |
| Storage Temperature | -40 to +85°C | -40 to 185°F |
| Absolute Accuracy | ± 1.5°C (between 0 to 60°C) | ± 2.7°F |
| Physical | ||
| Recommended Through Hole Size | 10.2 mm | 13/32″ |
| Interfacing | ||
| ArduSub Compatible? | Yes | |
| Development Libraries | MS5837 Arduino, MS5837 Python, MS5xxx ArduPilot |
|
*Subjecting the sensor to the absolute maximum mechanical pressure may cause damage to the sensor.
2D Drawings
3D Models
- BAR30-PRESSURE-SENSOR-R1 (.zip)
- PENETRATOR-M-NUT-10-8-R2 (.zip)
Documents
- MS5837-30BA Data Sheet (PDF)
- Bar30 Schematic (PDF)
Revision History
- 29 March 2021 | Changes to operating temperatures
- 26 January 2016 | R1 – Initial release
Quick Start
1. Download MS5837 Arduino Library.
2. Install software such as the Example Code to your microcontroller.
3. Connect the DF13 or bare wires to the appropriate microcontroller pins, using a logic level converter if your board has 5V logic:
- Green: SCL (3.3V logic)
- White: SDA (3.3V logic)
- Red: +2.5-5.5V
- Black: Ground
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