SeapHOx™ V2 Ocean pH Sensor

The SeaFET™ V2 is the next generation pH sensor, upgraded from the original SeaFET™. The sensing element is an ion sensitive field effect transistor (ISFET). This class of device has been used for pH sensing in industrial processes, food processing, clinical analysis and environmental monitoring. The advantages of the ISFET include robustness, stability and precision that make it suitable for ocean pH measurement at low pressure. The ISFET potential is measured against two separate reference electrodes: one bearing a liquid junction (internal reference) and a solid state reference electrode (external reference), providing the user with the ability to assess instrument performance and ultimately achieve a greater understanding of the state of acid/base equilibria in seawater.

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Key Features Specifications Resources Content

Key Features

Moored pH, Conductivity, Temperature, Pressure (optional), and Optical
Dissolved Oxygen, at user-programmable 6-second to 6-hour intervals*
Integrated pump
RS-232 interface
Internal memory and batteries (can be powered externally)**
Expendable anti-foulant devices, unique flow path, and pumping regimen for bio-fouling protection
UCI graphical software package (setup, data upload, and data processing)
Field-proven MicroCAT family, with more than 10,000 instruments deployed
Maximum depth 50 m

Parameters Measured

Specifications

Specification	Value
Communication Options	RS-232 , USB
Depth Rating (Meters)	50m
Power Source	Internal , External
Housing Material Options	Plastic, Titanium
Onboard Memory	Yes
Connector	MCBH-8M , MCBH-4M
Sampling Rate	5 minutes to 24 hours
Memory Capacity (Samples)	32 MB (Over 1,240,000 samples)
Power Consumption	6 to 18 VDC
Accuracy	Conductivity ± 0.0003 S/m (0.003 mS/cm) Temperature ± 0.002 °C (-5 to to 35 °C); ± 0.01 °C (35 °C to 45 °C) Optional Pressure ± 0.1% of full scale range Dissolved Oxygen larger of ± 3 µmol/kg (0.07 ml/L, 0.1 mg/L) or ± 2% pH ± 0.05 pH
Software	UCI
Resolution	Conductivity 0.00001 S/m (0.0001 mS/cm) Temperature 0.0001 °C Optional Pressure 0.002% of full scale range Dissolved Oxygen 0.2 µmol/kg pH 0.004 pH
Biofouling Protection	Yes