DL-2 : Ozone Datalogger

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Product Overview

The DL-2 Datalogger easily stores up to 43,000 datapoints! Data is instantly & quickly transferred to the computer with included USB Cable & Windows XP compatible software. Review the manual here. The software manual can be seen here.


  • Stores tens of thousands of data points
  • Easy-to-use software
  • Push-button, or sheduled, start
  • Includes software, USB interface cable and software manual
  • Compatible with any ozone monitor

More Information

Weight 2.2500
Dimensions 0.9 x 2.3 x 2.9 inches (2.2 x 5.8 x 7.4 cm)
Warranty 1 Years
Accuracy +/- 2 mV, +/- 2.5% of absolute reading
Has Battery yes 1-year life - user replaceable (CR-2032 lithium)
Operating Temperature -4 to 158°F (-20 to 70°C)
Input Voltage Range 0 - 2.5 VAC
Activity Indicator yes Blinking LED confirms operation
Software Instantly plot data(min, max, avg) with HOBOware Lite software for Windows, or Mac - Export points as a text file (.csv or .txt) into Excel, Lotus, Etc.
Storage Space 64 KB 43,000 data points
Memory Type EEPROM memory retains data after battery has been removed
Signal Resolutions 16-bit
Analog Inputs 0-2.5 V

How It Works

  • View multiple parameters from one or more loggers on one graph
  • Combine data from multiple deployments on one graph
  • Copy-and-paste data from one plot onto another
  • Zoom and axis-control tools to focus on data of interest
  • Optional display of recorded events such as button push/release, host computer connection, and/or low battery in graphs or file exports


On the OS-4, why is my Analog Output reading 1/2 of the Display reading? (For example, the OS-4 analog output seems to indicate 0.2 ppm when the OS-4 display reads 0.4 ppm)

This discrepancy is due to the Scaling of the Analog Output (and applies to both the 4-20 mA and 0-2V outputs). The OS-4 utilizes an SM-X sensor. This chip, on its own, is designed to read up to 20 ppm. Therefore the output of the chip scales from 0-20 ppm, even though the OS-4 is rated for just 0-10 ppm. If your analog readings are 1/2 of what is diaplayed, it is likely because you scaled your analog output from 0-10 ppm instead of 0-20 ppm. As an example, if your OS-4 is reading 10 ppm you may expect to see 2V on the analog output (full scale). Instead, you will see 1V (1/2 scale). This is because the analog output scales to the full 20 ppm range of the SM-X sensor chip, meaning that a 1V reading corresponds to 10 ppm. The correction is to scale your analog output from 0-20 ppm (4-20 mA output or 0-2V output).

How long does the internal battery last?