Accession Number:

ADA048599

Title:

A Sensor for the Detection of CO2 in Hyperbaric Gaseous Environments.

Descriptive Note:

Final rept.,

Corporate Author:

ANDROS INC BERKELEY CALIF

Personal Author(s):

Report Date:

1977-11-01

Pagination or Media Count:

42.0

Abstract:

The characteristics of the essential components of a Nondispersive Infrared NDIR gas sensor for measuring CO2 concentrations in hyperbaric gaseous environments have been studied. The technique used is to subject a known volume of sample gas to a periodic density modulation and to measure the amount of CO2 present by observing the fractional change in a beam of infrared radiation transmitted through that volume. A sensor that uses this technique has been built for use in habitats at pressures up to 600 psia. It measures 8 x 7 x 14 inches and operates directly from 28 volts DC. The sensors response is not strongly pressure dependent the maximum deviation from the response at 14.7 psia being only 18 of reading. Neither re-zeroing nor recalibration are necessary since the design inherently maintains both. 0 to 90 response is about 40 seconds for both increasing and decreasing pCO2. Author

Subject Categories:

  • Stress Physiology
  • Test Facilities, Equipment and Methods

Distribution Statement:

APPROVED FOR PUBLIC RELEASE