Unlike traditional glass-electrode pH sensors that need frequent manual calibration to correct reference drift, use special buffer solutions, and have special storage requirements, the ANB Sensors pH Sensor uses solid-state electrochemical sensing technology that self-calibrates during operation. There’s no fragile glass, no liquid reference to dry out, and no special storage requirements. Store it wet or dry, deploy it, and it’s ready to go. That makes this sensor especially well suited for real-world field use on underwater vehicles, buoys, fixed monitoring stations, and autonomous platforms. It also enables long-term deployments and networked or IoT-style applications; basically anywhere pH data is needed but frequent hands-on maintenance isn’t practical. Different Depths, Same Performance The pH sensor comes in two versions with identical sensing performance but rated for different depths. The AQ5 is rated to 5 meters and has a 3-meter cable, making it a great fit for surface vehicles like the BlueBoat or for surface monitoring on a buoy. The OC300 is rated to 300 meters and has a 1-meter cable, suited for use on an ROV or for deeper-water monitoring. Both sensors measure pH from 2 to 10 with a resolution of 0.01 pH and accuracy of ±0.2 pH, across a salinity range of 0.1–40 ppt. In addition to pH, they also measure temperature, salinity, and conductivity, include a built-in immersion sensor, and have 8 GB of internal memory for onboard data logging. As Easy as A-N-B The solid-state transducer doesn’t require routine manual calibration and only minimal maintenance. After about 75,000 measurements, a light abrasion of the transducer surface with the included sanding pad is all that’s needed. The sensor tracks this automatically and alerts you when service is due. When the transducer reaches the end of its service life, it’s user-replaceable. Replacements are available here. Each sensor comes with a pre-installed WetLink Penetrator and mounting hardware for easy installation on the BlueROV2 or BlueBoat. They communicate via RS-485, so a BLUART USB-to-RS485 adapter is required. Once connected to a vehicle, ANB Sensors’ BlueOS extension lets you view pH and other data in real time, with measurements automatically logged in the autopilot log. Check out the integration guides to help get up and running. Contents 1 x ANB Sensors pH Sensor 1 x Sensor mount (BR-102400) 1 x Sanding pad and sanding discs 1 x Pry tool and mini screwdriver 1 x 10 gram Super O-Lube 1 x M10 bulkhead nut & -013 O-ring (BR-100167-010) 1 x BlueBoat Hull Mount Bushing 1 x M6x20 socket head cap screw (BR-102241) 1 x M6 nylon insert lock nut (BR-101258) 4 x M3x8 button head cap screw (BR-100488) 4 x M3x16 button head cap screw (BR-101038) 4 x 8.5″ Cable tie (BR-102154) Specifications Parameter Value Performance Depth Rating AQ5: 5 m OC300: 300 m pH Range 2–10 pH Accuracy ±0.2 pH pH Resolution 0.01 pH Salinity Range 0.1–40 ppt Temperature Range -5 to +40 °C Temp Accuracy ±0.2 °C Temp Resolution 0.01 °C Electrical Supply Voltage 6–42 V DC (isolated) Power Consumption Options (Active) <40 mA @ 12 V DC 90 mA @ 12 V DC Power Consumption Options (Idle) <1 mA @ 12 V DC 60 mA @ 12 V DC Communication Interfaces RS-485 RS-232 (not connected) Baud Rate 9600–115200 (default 57600) Sampling Rate User configurable / polled Cable Jacket Material Polyurethane Cable Length AQ5: 3000 mm ± 50 OC300: 1000 mm ± 50 Connector Type 4-position JST GH Connector Pinout 1 - Red - Vin 2 - White/green - A (non-inverting) 3 - Green - B (inverting) 4 - Black - GND WetLink Penetrator M10-5.5MM-LC Penetrator O-ring AS568-013 Buna-N 70A Physical Overall Length 170 mm Wetted Materials Delrin Aluminum 7075-T6 Polyurethane FKM Buna N Molykote 111 Weight in Air 300–600 g Weight in Water 40–80 g Guides Integrating the ANB Sensors pH Sensor on the BlueROV2 Integrating the ANB Sensors pH Sensor on the BlueBoat