2
INTRODUCTION
Thank you for purchasing DOH-SD1 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.
The DOH-SD1 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-inch-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 DOH-SD1 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 DOH-SD1 has a backlit 1.5 x 2.0-inch display and is powered by six AA Alkaline batteries
or an optional 9-VDC AC adapter.
KEY FEATURES
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Uses heavy-duty polargraphic oxygen probe
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Precisely measures DO from 0 to 20 mg/L, as well as liquid temperature
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Easy to calibrate
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Supports automatic and manual datalogging
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Time-stamps and stores measurements on SD memory cards
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Sampling time settable from 1 second to 9 hours
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Automatically compensates for altitude and salt content of liquids
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1.5 x 2.0-inch backlit liquid crystal display
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Powered by six AA batteries or optional 9-VDC adapter
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Readings switchable between degrees F and C
2. SPECIFICATIONS
