BarXT Extended Submersion Depth/Pressure Sensors

€380.00€476.90Excl. VAT — added at checkoutIncl. 25.5% VAT (Finland) — final VAT is calculated at checkout

Ordered for you — ships in about 7 business days

Delivery across Europe from Finland, other countries on request
Not sure it fits your build? Ask us — we build on the same platform.

Description

The BarXT pressure sensor series is designed for underwater applications where sensors need to remain submerged for extended periods without maintenance. They’re ideal for ROVs, AUVs, and other subsea instrumentation in long-term deployments where reliability is important.

BarXT sensors use the M10 bulkhead penetrator form factor machined from 316 stainless steel, coated with black oxide to reduce galvanic corrosion, and feature a front cover that protects the sensing element from physical damage. BarXT is built to handle harsh marine environments and extended missions.

The BarXT line uses the Keller 4LD series sealed pressure and temperature sensor, and includes four models to cover a range of depths and resolutions:

Model	Operating Range	Approximate Depth	Resolution
Bar3XT	0–3 bar	20 m	0.091 mbar (0.9 mm)
Bar10XT	0–10 bar	100 m	0.31 mbar (3.12 mm)
Bar30XT	0–30 bar	300 m	0.92 mbar (9.36 mm)
Bar100XT	0–100 bar	1000 m	3 mbar (31 mm)

Performance Under Pressure

All BarXT models also measure temperature, accurate to ±2 °C. They 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.

They are fully supported in ArduSub, and we provide Arduino and Python libraries for simple integration into your projects. The electrical schematic and board layout are also provided, so you can adapt the design to your own projects.

If you’re looking for a more budget-friendly option, the Bar series sensors provide accurate depth and pressure for intermittent submersion applications. And if you need a temperature sensor with even more accuracy, try out the Celsius Temperature Sensor.

What's in the box

1 x BarXT Pressure Sensor based on selection
1 x M10 bulkhead O-ring
1 x Bulkhead nut

Technical details

Specifications

Model	Bar3XT	Bar10XT	Bar30XT	Bar100XT
Electrical
Supply Voltage (Vin)	2.5–5.5 V
I²C Logic Voltage (SDA and SCL)	1.8–3.6 V
Typical Current	1.5 mA
Idle Current	100 nA
Performance
Operating Temperature	-10 to 80°C
Maximum Mechanical Pressure ¹	12 bar	40 bar	120 bar	400 bar
Operating Pressure	0–3 bar	0–10 bar	0–30 bar	0–100 bar
Operating Depth ²	0–20 m	0–92 m	0–296 m	0–1009 m
Accuracy (0.15 % FS)	± 4.5 mbar (±0.046 m in freshwater)	± 15 mbar (±0.153 m in freshwater)	± 45 mbar (±0.46 m in freshwater)	± 150 mbar (±1.54 m in freshwater)
Total Error Band (0–50°C) (0.7% FS) ³	± 21 mbar (±0.21 m in freshwater)	± 70 mbar (±0.72 m in freshwater)	± 210 mbar (±2.15 m in freshwater)	± 700 mbar (±7.16 m in freshwater)
Resolution	0.091 mbar (0.9 mm in freshwater)	0.31 mbar (3.12 mm in freshwater)	0.92 mbar (9.36 mm in freshwater)	3 mbar (31 mm in freshwater)
Long Term Stability (typ.)	± 3 mbar	± 10 mbar	± 30 mbar	± 100 mbar
Pressure Type	PA: Sealed pressure, 1 bar absolute reference pressure
Temperature Accuracy (typ.)	± 2°C
Temperature Resolution	0.0031°C
Physical
In Air Weight (No Nut)	32 g
In Water Weight (No Nut)	27 g
Bulkhead O-ring Size	AS568-013 Buna-N 70A
Bulkhead Thread	M10 x 1.5
Installation Hole (Port) Size
Clearance	10.0–10.2 mm
Tapped	M10 x 1.5
Bulkhead/ Plug Material	Stainless steel 316L, black oxide coated
Wetted Materials	Stainless steel 316L, black oxide coated Buna N Viton Molykote 111
Interfacing
ArduSub Compatible	Yes
Development Libraries	KellerLD-Arduino KellerLD-Python KellerLD-ArduPilot
I²C Address	0x40
Connector	4-position JST GH
Mating Connector	4-pos JST GH available on Digi-Key
Connector Pinout	1 - Red - Vin 2 - Green - SCL 3 - White - SDA 4 - Black - GND
¹ Maximum mechanical pressure is the highest pressure the sensor can withstand before sustaining permanent damage. ² Depth values assume 1 bar atmospheric pressure and freshwater density (1000 kg/m³); actual values vary with fluid density. ³ TEB (Total Error Band): Maximum deviation within specified pressure and compensated temperature range (i.e. maximum error to expect during use).