Electrochemical Carbon Dioxide Sensor

Item

Title
Electrochemical Carbon Dioxide Sensor
Date
1967
Index Abstract
Not Available
Photo Quality
Complete
Report Number
AMRL TR 66-237
Creator
Leitz, Frank B.
Corporate Author
Ionics, Incorporated
Laboratory
Aerospace Medical Research Laboratories
Extent
54
Identifier
AD0655936
Access Rights
Distribution of this document is unlimited
Distribution Classification
1
Contract
AF 33(615)-3261
DoD Project
6373
DoD Task
637302
DTIC Record Exists
No
Distribution Change Authority Correspondence
None
Distribution Conflict
No
Abstract
The purpose of the program was to develop a novel carbon dioxide sensor based on obtaining changes in the electrical resistance of anion-exchange resin proportional to the ambient partial pressure of carbon dioxide. The change in resistance is due to the increased ionization of a weakly ionized base in the presence of a sightly acid gas. A laboratory program was conducted to evaluate the response of various types of weak-base ion-exchange polymers to carbon dioxide concentrations in the range of 0 to 4%. The optimum material consisted of a condensation polymer of resorcinol, formaldehyde and triethylenetetramine. A laboratory model of the CO2 Sensor was fabricated using these sensing elements in the form of small, thin strips. In order to minimize the effects of humidity and temperature, the model contained two sensing elements, one being a reference. A guard chamber was provided to absorb any strongly-acid gases. Electrical readout is made on a balancing potentiometer with an earphone detector. The Sensor is small (about 50 cubic inches), weighs less than 6 ounces, has a power requirement of less than 0.5 watts, and its operation is independent of gravity.
Report Availability
Full text available
Date Issued
1967-05
Provenance
RAF Centre of Aviation Medicine
Type
report
Format
1 online resource
Media
AMRLTR66-237.pdf