Precision Measurement Engineering (PME), a freshwater instrument design provider, has unveiled the miniDOT, which is a small logger that notes down temperature and dissolved oxygen measurements internally for long periods of time.
Michael Head, the CEO of PME, revealed that they were greatly excited to release the miniDOT logger as it would permit users to record measurements and at the same time maintains long periods of service before the necessity of replacing the batteries arises.
The miniDOT includes a dissolved oxygen sensor, an optode, which could measure the luminescence quenching of fluorescence of a thin membrane along with a thermistor for measuring temperature. A 2 GB internal SanDisk memory card records the data. The logger’s life span would be 200 days if the sample frequency is every 1 minute, and if it is every 10 minutes, then the logger would be operable for 475 days. The logger could be programmed to record measurements at 1 minute to 1 hour intervals.
The measurements are noted down with an accuracy of +/- 5% and a +/- 0.1°C temperature. Being self contained, the miniDOT oxygen logger is capable of functioning in various liquid environments. Data is recorded on an internal SD card and then offloaded through a USB card reader to a computer. The logger is ultra compact and easy to operate. For each miniDOT, PME would include data visualization software, which is a Java program for displaying miniDOT logger data files and calculates the oxygen saturation along with air pressure on the basis of elevation of the water surface over the sea level.
The device could be put to use in a number of monitoring applications as its fluorescence technology would precisely and efficiently gather the measurements of dissolved oxygen in varied liquid sources such as aquaculture, oceans, waste water, water column profiling, water treatment outfalls, estuaries, rivers and lakes.