Bar High-Resolution Depth/Pressure Sensors - Bar30 - 0–30 bar (~300 m)

Bar High-Resolution Depth/Pressure Sensors - Bar30 - 0–30 bar (~300 m)

$135.00
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Bar High-Resolution Depth/Pressure Sensors - Bar30 - 0–30 bar (~300 m)
  • Bar High-Resolution Depth/Pressure Sensors - Bar30 - 0–30 bar (~300 m)
  • Bar High-Resolution Depth/Pressure Sensors - Bar30 - 0–30 bar (~300 m)
  • Bar High-Resolution Depth/Pressure Sensors - Bar30 - 0–30 bar (~300 m)
  • Bar High-Resolution Depth/Pressure Sensors - Bar30 - 0–30 bar (~300 m)
  • Bar High-Resolution Depth/Pressure Sensors - Bar30 - 0–30 bar (~300 m)
  • Bar High-Resolution Depth/Pressure Sensors - Bar30 - 0–30 bar (~300 m)
Bar High-Resolution Depth/Pressure Sensors - Bar30 - 0–30 bar (~300 m)

Bar High-Resolution Depth/Pressure Sensors - Bar30 - 0–30 bar (~300 m)

These pressure sensors provide underwater pressure, depth and temperature measurements for ROVs, AUVs, and underwater instrumentation.
These are great for intermittent submersion and must be dried daily. For long-term deployments, check out the BarXT line of sensors!
$135.00

Price ex GST, Australian customers charged 10% GST at checkout
Product Description

The Bar30 is a compact, high-resolution pressure sensor designed for underwater depth and pressure measurement. Housed in an aluminium body with a standard bulkhead penetrator form factor, it installs quickly into watertight enclosures and is well-suited for ROVs, AUVs, and other subsea instrumentation.

Built around the Measurement Specialties MS5837-30BA sensing element, the Bar30 measures pressures up to 30 bar — equivalent to approximately 300 metres water depth. With a depth resolution of 2mm, it's an excellent choice for deep-water ROV applications and general underwater monitoring systems. The sensor also incorporates a temperature measurement function with ±4°C accuracy.

Communication is via I²C interface, operating on 3.3V logic with support for up to 5.5V power input. The included JST GH connector ensures compatibility with popular flight controllers such as the Navigator and Pixhawk autopilot systems. Full electrical schematics and board layouts are open-source, allowing integration into custom designs.

The Bar30 is fully compatible with ArduSub and other ArduPilot firmware variants.

Important: The sensing element features a protective gel coating that requires drying for a minimum of 2 hours daily to maintain measurement accuracy. Extended continuous submersion may cause permanent sensor damage.

Contents
  • 1 x Bar30 Pressure Sensor
  • 1 x Bulkhead O-ring (AS568-013)
  • 1 x Bulkhead Nut
Specifications

ELECTRICAL

Supply Voltage (Vin) 2.5–5.5 V
I²C Logic Voltage (SDA/SCL) 2.5–3.6 V
Peak Current 1.25 mA

PERFORMANCE

Operating Pressure Range 0–30 bar
Operating Depth (freshwater) 0–295.6 m
Maximum Mechanical Pressure 50 bar
Depth Resolution 0.2 mbar (2 mm in freshwater)
Absolute Accuracy (0 to 45°C) ±200 mbar (±2.04 m in freshwater)
Absolute Accuracy (-20 to 85°C) ±400 mbar (±4.09 m in freshwater)
Temperature Sensor Accuracy ±4°C (absolute)
In-Air Operating Temperature -20 to 85°C
In-Water Operating Temperature 2 to 40°C

PHYSICAL

Weight in Air 14 g
Bulkhead Thread M10 x 1.5
Installation Hole (Clearance) 10.0–10.2 mm
Installation Hole (Tapped) M10 x 1.5
Storage Temperature -40 to 85°C
Maximum Continuous Submersion 24 hrs (must dry for 2+ hrs daily)

INTERFACE

Communication Protocol I²C
I²C Address 0x76
Connector 4-position JST GH
ArduSub Compatible Yes
Pinout
Pin Wire Colour Function
1 Red Vin (2.5–5.5V)
2 Green SCL (I²C Clock)
3 White SDA (I²C Data)
4 Black GND

Note: I²C lines operate at 3.3V logic. Use a level converter if interfacing with 5V microcontrollers.

2D Drawings

Technical drawings are available for download.

Download 2D Drawing (PDF)

3D Models

3D model files are available for integration into your designs.

Download Bar30 3D Model (.zip)

Guides

Quick Start

⚠️ Important: The Bar30 is not fully waterproof on its own. While the sensing face is sealed for water exposure, the rear side where wires exit is not sealed. A proper watertight seal is only achieved when the bulkhead is correctly installed through an enclosure or mounting surface.

  1. Connect the JST GH connector (or bare wires) to your microcontroller. If your board uses 5V logic, a level converter is required for the I²C lines:
    • Red: 2.5–5.5V power
    • Green: SCL (3.3V logic)
    • White: SDA (3.3V logic)
    • Black: Ground
  2. Install the sensor in your enclosure using the M10 bulkhead thread and included O-ring.
  3. Use the available code libraries to interface with the sensor.

Development Libraries

Resources

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