Products

AQ2 Range:

AQ2 calibration-free pH sensors are available in four depth ratings for reliable monitoring across the world’s oceans and waterways. Fully solid-state and engineered for long-term deployment, they can be stored wet or dry and are easily adapted to integrate into virtually any housing or platform. The range includes 5 m models for rivers, ponds, and RAS facilities; 50 m for coastal waters, estuaries, and sea cages; 300 m for buoys, autonomous vehicles, and profiling applications; and 1250 m for deep-water buoys, vehicles, and profiling. Delivering robust, low-maintenance pH monitoring from inland waters to the deep ocean.

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Specifications

Measurement

pH Range: 2–10
pH Accuracy: ±0.1 (high salinity) / ±0.2 (low salinity)
Resolution: 0.01
Response: Instantaneous
Operating Salinity for pH: 0.025–40 ppt
Temperature Sensor Accuracy: ±0.2°C

Deployment

Operational Temperature: -5 to 40°C
Depth Ratings: 5 m, 50 m, 300 m, 1250 m

Physical
5 m 50 m 300 m 1250 m
Dimensions: 41 x 191 mm 41 x 191 mm 41 x 191 mm 41 x 191 mm
Weight in Air: 0.26 kg 0.3 kg 0.3 kg 0.6 kg
Weight in Water: 0.04 kg 0.08 kg 0.08 kg 0.38 kg
Drawing: PDF PDF | STEP PDF | STEP PDF | STEP
Power

USB Supply Voltage: 6–42 VDC
Power Consumption: 90 mA

Connectivity

Physical Comms: RS232/485
Comms Protocols: Modbus, Terminal
Storage: 8 GB
Modes: Timed, Polled, Continuous

Certifications

Accessories

INTEGRATION KIT – for integrating into sondes, and vehicles
iKit

PDF | STEP

FLOW ADAPTER – for flow line integration

BATTERY HOUSING with BATTERY MANAGEMENT SYSTEM – for autonomous monitoring

Our battery housings include a unique battery management system (BMS) for the sensor and battery but do not include the battery.

The BMS ensures reliable power management for deployments. It optimises battery performance by minimising current draw when not measuring, and monitors voltage to prevent deep discharge, ensuring batteries remain above the minimum voltage required for recharging. With an onboard SD card for easy data access, it provides a smart and efficient solution for long-term monitoring.

For batteries, we are working with Blue Robotics and have housings suitable to accept one or two of the Lithium-ion 14.8V, 15.6Ah or Lithium-ion 22.2V, 28Ah batteries.

Our battery housings:
– Depth Rating: 900m
– Dimensions: 480mm (l) x 120mm (d)
– Power Management System: built-in to allow a low current draw when not sampling, for optimal battery lifetimes
– Battery Voltage Monitor: to ensure the voltage stays above its recharge minimum
– Onboard SD Card: for quick data retrieval post-deployment. Just pop out the SD card and take the data straight from the unit, removing the need to download the data from the sensor

To find which battery pack is best suited to your deployment, please check the table below as a guide to show how long each battery pack will last under various sensor measurement frequencies.

Continuous (23 secs) every 15 mins every 1 hr every 2 hr every 3 hr every 4 hr
BP14V8S 7 days 19 days 77 days 152 days 226 days 298 days
BP22V2S 12 days 35 days 138 days 274 days 406 days 535 days
BP14V8D 13 days 39 days 154 days 305 days 452 days 596 days
BP22V2D 23 days 70 days 277 days 547 days 812 days 1070 days
DATA TRANSFER UNIT – for easy communication to/from your sensor

The Data Transfer Unit (DTU) allows easy access from the sensor to a USB of a computer.

There are two different models:

Depth Rating Function
DTU Non-Submersible DTU
DTU-A Non-Submersible DTU and Analog out functions
ANALOG SIGNAL UNIT – for Voltage or Current output

The Analog signal units allow for either a current or voltage analog output from the sensor.


The different models are:

Depth Rating Function
DTU-A Non-Submersible DTU and Analog out functions – Current or Voltage out
ACU300 300m Analog out functions – Current out
ACU1250 1250m Analog out functions – Current out
AVU300 300m Analog out functions – Voltage out
AVU1250 1250m Analog out functions – Voltage out

The units can be terminated via SubConn or pigtail