Portable electrochemical sensor methods.

Details

• Personal Author:
  Woodfin WJ
• Description:
  INTRODUCTION: Portable electrochemical sensor methods include instruments employing this technology in the determination of oxygen and several toxic gases in the field, using battery-supplied power. They range in size from those small enough to fit into a shirt pocket and weighing less than one pound (0.45 kg) to larger units that weigh as much as six pounds (2.7 kg). 2. PRINCIPLES OF OPERATION: The basis for all electrochemical sensors is the use of a porous membrane (normally PTFE) or capillary system which allows the gas to diffuse into the cell containing the liquid or gel electrolyte and the electrodes (Figure 1). The exact configuration will vary with manufacturers and between different toxic gases. When the gas comes into contact with the electrolyte, a change in electrochemical potential between the electrodes is produced. Associated electronic circuitry then will measure, amplify, and control this electronic signal. Because the reaction is proportional to the concentration (partial pressure) of gas present, the signal is easily translated into parts per million, percent, or ppm-hrs, and read on the readout meter or stored in microprocessor circuits for later readout.
• Subjects:
  Accidents, Occupational Occupational Health Personal Protective Equipment Respiratory Protective Devices Safety
• Keywords:
  Detectors Laboratory-equipment Laboratory-techniques Monitors Sampling-methods
• Document Type:
  Text
• Genre:
  Chapter
• Place as Subject:
  Ohio ; OSHA Region 5
• CIO:
  National Institute for Occupational Safety and Health (NIOSH)
• Division:
  DPSE - Division of Physical Sciences and Engineering
• Topic:
  Workplace Safety & Health
• Location:
  North America
• Pages in Document:
  70-74
• NIOSHTIC Number:
  nn:20025728
• Citation:
  NIOSH manual of analytical methods, fourth edition - third supplement. Cincinnati, OH: U.S. Department of Health and Human Services, Public Health Service, Centers for Disease Control and Prevention, National Institute for Occupational Safety and Health, DHHS (NIOSH) Publication No. 2003-154, 2003 Mar; :70-74
• Federal Fiscal Year:
  2003
• Peer Reviewed:
  False
• Source Full Name:
  NIOSH manual of analytical methods, fourth edition - third supplement
• Collection(s):
  National Institute for Occupational Safety and Health
• Main Document Checksum:
  urn:sha-512:b2f643ae333559178192e72d4d478a2c4d360d8146f18a05f339e9166ab66218a5ad314321efb0d07ed484b32ce8c5bc87c9d25980d6ca7aaa8a090034583d88
• Download URL:
  https://stacks.cdc.gov/view/cdc/181260/cdc_181260_DS1.pdf
• File Type:
  [PDF - 18.28 KB ]