Envco – Environmental Equipment

Optical Sensor Technology
Unlike conventional dissolved oxygen sensors, the D-OptoLogger sensing element utilizes fluorescence to measure dissolved oxygen. The basic principle involves subjecting a fluorescing compound (ruthenium) to a fixed wavelength of light. When the light source is removed, the compound emits a fluorescence, the intensity of which is dependent on the oxygen levels present in the surrounding water. An extremely stable electronic circuit has been designed to firstly excite the ruthenium, and then measure the intensity of the resulting fluorescence. Therefore using this circuitry, the D-Opto Logger provides accurate dissolved oxygen measurements over long periods of time (many months) without re-calibration.

Unlike conventional polargraphic dissolved oxygen sensors, the optical method does not consume oxygen. Consequently the measurement of dissolved oxygen by the D-Opto Logger is unaffected by water movement.

The D-Opto Logger does not utilize a membrane or any other consumables, thus minimizing servicing requirements.

Operation
The D-OptoLogger is supplied with a communication cable. This cable has a 9 pin serial plug on one end, and a 3.5mm jack plug on the other end.

The 9 pin plug is plugged into the serial plug on the PC. If the PC does not have a serial port, a USB to serial adaptor can be used. This adaptor plugs into the USB port on the PC, and has a serial port that the communication cable 9 pin plug can be plugged into.

The jack plug on the cable is plugged into the communication socket, . This is accessed by removing the D-Opto Logger's end cap.

Logging Endurance
Circular or Wrap Around logging options.

If the D-OptoLogger is set to circular memory, the possible effective length of deployment will be limited by the life of the batteries. This will depend on the logging interval, and the quality of batteries used. Typically the power endurance should exceed 30 days for all logging intervals.

If the D-Opto Logger memory mode is set to -Stop logging when memory is full-, the unit stops logging.

The best optical dissolved oxygen logger on the planet.

Ordering Information
D-02 D-Opto Logger includes;
communications cable, o-ring kit, PC software, manual and battery.