SeapHOx - Ocean CT(D)-pH-DO Sensor

The Sea-Bird Scientific SeapHOxTM combines the Satlantic SeaFETTM pH sensor with the Sea-Bird Electronics SBE 37-SMP-ODO MicroCAT CTD+DO sensor. The SeapHOxTM allows for the integrated data collection of pH with the critical oceanographic and biological measurement of temperature, salinity, and oxygen. The integrated package also allows the SeaFETTM to take advantage of the SBE 37`s pumped flow path and anti-fouling technology, extending deployment durations in some cases.

Features

• Moored pH, Conductivity, Temperature, Pressure (optional), and Optical Dissolved Oxygen, at user-programmable 5-minute to 24-hour intervals
• Integral pump
• RS-232 or USB interface
• Internal memory and batteries (can be powered externally)*
• Industry-leading conductivity cell biofouling protection
• SeaFETCom© Windows software package (setup, data upload, and data processing)
• Field-proven MicroCAT family, with more than 10,000 instruments deployed
• Maximum depth 50 m

* The instrument MUST carry internal batteries; external power may extend the deployment duration depending on the sampling regime.

Components

• pH sensor is Ion selective field effect transistor type
• Unique internal-field conductivity cell permits use of expendable anti-foulant devices, for long-term bio-fouling protection
• Aged and pressure-protected thermistor has a long history of exceptional accuracy and stability
• Optional strain-gauge pressure sensor with temperature compensation is available in two ranges
• Oxygen sensor is field-proven, individually calibrated SBE 63 Optical Dissolved Oxygen sensor
• Pump runs for each sample, providing improved pH, conductivity, and oxygen response, bio-fouling protection, and correlation of CTD and oxygen measurements

Options

• RS-232 or USB interface
• Optional strain-gauge pressure sensor
• Wire mounting clamp and guide or brackets for mounting to a flat surface

Specifications

Measurement
Conductivity: 0 to 7 S/m (0 to 70 mS/cm)
Temperature: -5 to 45 °C
Optional Pressure: 20 or 100 m measurement range
Dissolved Oxygen: 120% of surface saturation in all natural waters (fresh and salt)
pH: 6.5 - 9.0 pH
 
Initial 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: 0.02 pH
 
Typical Stability
Conductivity: 0.0003 S/m (0.003 mS/cm) per month
Temperature: 0.0002 °C per month
Optional Pressure: 0.05% of full scale range per year
Dissolved Oxygen: sample-based drift < 1 μmol/kg/100,000 samples (20 °C)
pH: 0.003 pH/month
 
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
 
Miscellaneous
Memory Capacity: 4 GB
System Depth Rating: 50 m
System Dimensions: 74.17 cm x 28.25 cm x 12.90 cm | 29.2" x 11.12" x 5.08"