GTD-Pro™

The most accurate sensor in the world for measuring total dissolved gas pressure in studies of gas build-up, air-sea gas flux, and net biological production.

GTD-Pro™

The most accurate sensor in the world for measuring total dissolved gas pressure in studies of gas build-up, air-sea gas flux, and net biological production.
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Features

  • High accuracy, long-term stability
  • Multiple data outputs
  • Superior response rate with the hurricane model, HGTD
  • Easily integrated into any system
  • Patented tubular interface (HGTD provides unique biofouling resistance)
  • Internal data logger and controller with 2GB flash memory

Sensor Applications

  • Air-sea gas transfer rates
  • Net biological production estimates
  • Near-surface flux studies
  • Correction of other dissolved gas measurements

GTD-Pro™ Submersible Sensor

The GTD-Pro™ is the most accurate and stable total dissolved gas sensor on the market. It measures the sum of the partial pressures of all dissolved gases, i.e. gas tension.

In most natural waters N2 and O2 are the dominant dissolved gases. When oxygen is measured independently, N2 can be determined from gas tension. These gases measured together can be used to make substantially improved estimates of net biological production.

Additionally, gas tension measurements are used to study air-sea gas exchange and upper-ocean physical, chemical, and biological processes.

Also available is the HGTD-Pro™ hurricane model that uses a patented supported tubular interface for faster equilibration than the GTD-Pro™.

PRODUCT SPECIFICATIONS

Sensor Performance
Accuracy 0.01%
Resolution 0.002 mbar
Stability < 0.02 mbar/yr drift
Range (other ranges available) 800-2000 mbar
Equilibration time (t63) GTD-Pro: 3 min
HGTD: 1 min
Physical GTD-Pro HGTD
Length 38 cm 25.4 cm
Diameter 10 cm 11.7 cm
Weight air 2.8 kg 1.6 kg
Weight water 0 kg 0.6 kg
Housing Acetal Plastic
Depth 0-600 m 0-50 m
Electrical
Input voltage 10-30 VDC
Power consumption 0.55 W
Data output RS-232, ASCII format
Sample rate 1 second (user selectable with datalogger/controller)

OPTIONAL ACCESSORIES

Water-Pumped Head
Reduces biofouling and improves response rate

External Battery Pack
76, 134, or 247 Amp-hour capacity

Titanium Housings
Rated to 4000 meters depth