Development of a proportional sampler for automobile exhaust emissions testing
Abstract
The development of a device that is capable of sampling gaseous emissions from automobiles is described. The device samples exhaust gases at a mass rate that is proportional to the total exhaust gas mass flow rate, which is measured using an ultrasonic vortex flowmeter. The flowmeter delivers signals, which are conditioned by process control electronics, to a sample valve. Non-standard temperature and pressure conditions at both the vortex flowmeter and the sample valve are compensated for in the process control electronics.
- Publication:
-
NASA STI/Recon Technical Report N
- Pub Date:
- June 1976
- Bibcode:
- 1976STIN...7718427H
- Keywords:
-
- Air Sampling;
- Automobile Fuels;
- Exhaust Gases;
- Flowmeters;
- Flow Measurement;
- Gas Flow;
- Samplers;
- Ultrasonic Tests;
- Instrumentation and Photography