INTRODUCTION
Thank you for purchasing General Tools & Instruments’ DOM5512SD Dissolved Oxygen
Meter with Datalogging SD Card. Please read this user’s manual carefully and thoroughly
before using the instrument.
Many commercial and industrial processes carefully monitor the concentration of oxygen
contained in water because dissolved oxygen (DO) level is an excellent indicator of water
quality. For example, if the DO level of a body of water remains too high or too low for too
long, fish and other aquatic organisms will die or become more susceptible to disease.
For quality control purposes, many industries other than fish farming and water pollution
control routinely measure and keep track of the DO levels of their process streams in real
time. Among them are food processing, photography, pulp and paper manufacturing,
power generation, electroplating and facilities management.
General Tools & Instruments’ DOM5512SD has all of the features needed by an
instrument suitable for precision measurement of DO levels in a wide range of
applications. Its 7.5 in. long, polarographic, electrolyte-filled oxygen probe measures not
only the DO concentration of a liquid, but the liquid’s water temperature as well. The
meter uses a single custom microcontroller to display readings from 0 to 20
milligrams/liter (mg/L) with a resolution of 0.1 mg/L and an accuracy of ± 0.4 mg/L.
Because it is microprocessor-based, the DOM5512SD can make full use of the portability,
reliability and large storage capacities that SD memory cards offer. Measurements can be
made automatically at any sampling rate between one second and nine hours. After the
instrument time-stamps and stores the measurements on an SD card plugged into it (a
process called datalogging), the user can remove the card and plug it into a laptop or
desktop computer either directly or via a USB card reader. The data logs are stored on the
card as files with the .xls extension that can be opened by Microsoft’s Excel application.
The DOM5512SD has a backlit 1.5 x 2.0 in. display and is powered by six “AA” Alkaline
batteries or an optional 9-VDC AC adapter.
3
