BS ISO 11614:1999

1 Scope
2 Normative references
3 Terms and definitions
4 Symbols and units
5 Principles of opacimeters
      5.1 General
      5.2 Measurement of light absorption
             coefficient
      5.3 Conditions of use
6 Specifications of opacimeters for measurement
      of opacity
      6.1 Basic specifications
      6.2 Design specifications
7 Additional specifications for opacimeters to
      measure light absorption coefficient
      7.1 Reference conditions
      7.2 Basic specifications
      7.3 Design specifications
8 Measurement of transients
      8.1 General
      8.2 Response of the opacimeter
      8.3 Physical delay time, td
      8.4 Temperature response time, tT
      8.5 Peak hold
9 Specifications concerning specific opacimeters
      and their installation
      9.1 Sampling opacimeter
      9.2 In-line full-flow opacimeter
      9.3 End of line (plume-type) opacimeter
      9.4 Opacimeter for free-acceleration tests
      9.5 Installation of opacimeters in a test
             bench
10 Data and instrumentation requirements
      10.1 Example of specific requirements for
             sampling opacimeters
      10.2 Data requirements
      10.3 Instrumentation requirements
11 Verification of opacimeter types
      11.1 Introduction
      11.2 General considerations
      11.3 Data supplied by the manufacturer
      11.4 Instrumentation requirements
      11.5 Instrument verification
      11.6 Verification of basic and design
             specifications
      11.7 Verification of response characteristics
12 Verification of in-service conformity of
      opacimeters
      12.1 General
      12.2 Items to be checked
      12.3 Details of checks
13 Test report of opacimeter verification
      13.1 Data and instrumentation requirements
      13.2 Results of instrument verification
      13.3 Results of verification of basic and
             design specifications (see 11.6)
      13.4 Verification of response characteristics
             (see 11.7)
Annex A (normative) Determination of the "mean exhaust
                    gas temperature" in the smoke
                    chamber of an air-scavanged
                    opacimeter
Bibliography

Defines general installation and requirements of apparatus for measurement of opacity and for determining the light absorption coefficient of exhaust gas from internal combustion engines.

This International Standard specifies the general requirements and the installation of apparatus for measurement of the opacity and for the determination of the light absorption coefficient of exhaust gas from internal combustion engines (not confined to road vehicles). These instruments are known as opacimeters.