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Potential problems associated with the Rustrak Ranger data logger's data storage technique

M G Gressel1, R J Kovein, P A Hentz

  • 1U.S. Department of Health and Human Services, National Institute for Occupational Safety and Health, Cincinnati, Ohio 45226.

American Industrial Hygiene Association Journal
|October 1, 1994
PubMed
Summary
This summary is machine-generated.

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The Rustrak Ranger data logger uses adaptive storage to maximize memory. However, sampling times under 30 minutes can lead to poor data resolution, limiting its use in certain industrial hygiene applications.

Area of Science:

  • Industrial Hygiene
  • Environmental Monitoring
  • Data Acquisition Systems

Background:

  • The Rustrak Ranger data logger has limited 8 kilobyte memory.
  • Adaptive storage is a patented technique to maximize data logger memory by predicting readings.
  • Data storage is determined by whether readings fall within a dynamic window around predicted values.

Purpose of the Study:

  • To evaluate the impact of sampling time on the data resolution of the Rustrak Ranger data logger.
  • To determine the suitability of the Rustrak Ranger for various industrial hygiene sampling schemes.

Main Methods:

  • Adaptive storage was employed to manage the data logger's memory.
  • Previously collected air monitoring data were used for evaluation.
  • Data were analyzed using two methods across sampling times ranging from 2 to 120 minutes.

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Main Results:

  • Poor data resolution was observed for sampling times as short as 30 minutes.
  • Window size adjustment impacts data storage rate and resolution.
  • Instrument characteristics and the nature of the measured agent affect data resolution.

Conclusions:

  • The Rustrak Ranger data logger may not be suitable for sampling schemes requiring high resolution at short intervals.
  • When used within its limitations, the data logger is effective for real-time industrial hygiene data recording.