NS 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 (C3)
6.3 Application to a specific group of machines
7 Control parameters and influencing factors
7.1 Control parameters
7.1.1 Type of tracer
7.1.2 Emitter shape and position
7.1.3 Aerodynamic characteristics of emission
7.2 Influencing factors on capture efficiency
8 Test report
Annex
A (informative) Simplified calculation of the
       random component of the uncertainty on C3(95%)

Gives a method to measure the capture efficiency of an exhaust system installed on a machine. It is based on a tracer technique and may be operated in all types of test environment (bench, room and field, as in ENV 1093-1). Applies only if the tracer shows aerodynamic behaviour comparable with the real pollutant.