10. Instruments with Sensors for Specific Chemicals

  1. Henry J. McDermott

Published Online: 11 OCT 2004

DOI: 10.1002/0471670588.ch10

Air Monitoring for Toxic Exposures, Second Edition

Air Monitoring for Toxic Exposures, Second Edition

How to Cite

McDermott, H. J. (2004) Instruments with Sensors for Specific Chemicals, in Air Monitoring for Toxic Exposures, Second Edition, John Wiley & Sons, Inc., Hoboken, NJ, USA. doi: 10.1002/0471670588.ch10

Author Information

  1. H. J. McDermott, Inc., Moraga, California, USA

Publication History

  1. Published Online: 11 OCT 2004
  2. Published Print: 3 SEP 2004

ISBN Information

Print ISBN: 9780471454359

Online ISBN: 9780471670582

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Keywords:

  • electrochemical;
  • metal oxide sensor;
  • calibration;
  • interferences;
  • oxygen monitor;
  • gold film mercury detector

Summary

One category of direct reading electronic instruments is designed with one or more sensors that respond to specific chemicals. The different principles of operation include electrochemical sensors, metal oxide sensors, infrared (IR) detectors, ultraviolet (UV) sensors, chemiluminescence devices and gold film sensors. Generally instruments with sensors that respond to a single chemical are less expensive and easier to use than instruments with detection systems that can be used to detect many different chemicals. Instruments range in complexity from “disposable” single gas monitor alarms that are designed to operate over their guaranteed life span with no maintenance beyond a periodic calibration check to complex devices that have multiple sensors, sophisticated datalogging and data management capability, multiple warning alarm levels, a pump to draw samples through tubing from some distance from the unit, and the option to include a broad response sensor such as a Photoionization Detector (PID) along with the chemical-specific sensors.