EN 1093-4:1996+A1:2008

Foreword
1 Scope
2 Normative references
3 Definitions
4 Principle
5 Simplified expression of the capture efficiency
6 Test method
  6.1 General procedure
  6.2 Measurement of the concentration (C[3])
  6.3 Application to a specific group of machines
7 Control parameters and influencing factors
  7.1 Control parameters
  7.2 Influencing factors on capture efficiency
8 Test report
Annex A (informative) - Simplified calculation of the
        random component of the uncertainty on C[3] (95%)
Annex ZA (informative) - Relationship between this European
         Standard and the Essential Requirements of EU
         Directive 98/37/EC
Annex ZB (informative) - Relationship between this European
         Standard and the Essential Requirements of EU
         Directive 2006/42/EC

This standard describes a method for the measurement of the capture efficiency of an exhaust system installed on a machine. This method is based on a tracer technique and may be operated in all types of test environment (bench, room and field, see ENV 1093-1). This technique is applicable only if the tracer shows aerodynamic behaviour comparable with the real pollutant (see 7.1.1). The measurement of the capture efficiency of an exhaust system can serve for: a) the evaluation of the performance of an exhaust system of a machine; b) the evaluation of the improvement of an exhaust system; c) the comparison of exhaust systems for machines of similar design; d) the ranking of exhaust systems according to their capture efficiency; e) the determination of the air flow of an exhaust to achieve a given level of capture efficiency; f) the determination of the state of the art of exhaust systems for machines with respect to the capture efficiency.