Features


	Features
	Small and light with large memory capacity Stirring of measurement sample not required Resistant to bio-fouling Two depth ranges: 300m and 6000m Non-volatile flash memory Built-in calendar / time information Direct connection to PC Programmable calibration factors Convenient Windows software Robust titanium housing
	Sensor Picture


Overview
The COMPACT-OPTODE is a small, precise data logger equipped with the optical DO sensor developed by Aanderaa Data. It is suitable for long-term, stable deployments. Oxygen is not consumed at the sensing surface, so stirring of the water surrounding the surface is not required. The measurement principle is based on dynamic fluorescence quenching which makes the sensor less susceptible to bio-fouling than conventional sensors. In addition, the sapphire sensing window of the COMPACT-OPTODE is rated up to 6000m. Since there is no membrane or electrolytic solution to change and moreover, since there is little drift, stable data measurements can be obtained without frequent re-calibration. Our state-of-the-art technology allows for a compact design capable of storing up to 172,800 sets of 3-channels of data (DO, temperature and voltage). The non-volatile flash-memory prevents data loss in case of power failure or irregular battery voltage. The operation of the COMPACT-OPTODE is managed through a PC's RS232-C port. The main unit records calendar and time information with each sample and the sensors' calibration coefficients are stored in the built-in memory. The basic measurement setup requires only the selection of the start time and the measurement parameters. Data transfer after completion of deployment is easy. Since measurement start time and calibration coefficients are automatically transferred to the data acquisition software together with the measured data, it is not necessary to manually manipulate the data after download and data processing can be started immediately. The data processing program offers clear and logical screens for easy operation.

Main Unit Specifications

Parameter	DO	Temperature
Type	Fluorescence quenching	Thermistor
Range	0 to 120 %	0 to 36 °C
Resolution	0.4 %	0.01 °C
Accuracy	Within 5 %	±0.05 °C
Memory type	2 Mbyte non-volatile flash memory
Capacity	172,800 data
A/D conversion	16 bits digital conversion
Interval	1,2,5,10,15,20,30 seconds
Burst time	1-1, 440 minutes
Sampling number	1,10,15,20,30,60,120,180,240,300,600,1200
Battery capacity	Lithium battery 7 Ah
Power consumption	90 mA during measurement 140 mA during data acquisition
Materials	Titanium
Size	54 mm dia., 272 mm in total length
Weight	1,000 g in air & 600 g in water
Depth rating	300 m or 6,000 m

Dimensions