BS 6069-4.3:1992

Committees responsible
National foreword
Method
1. Scope
2. Normative reference
3. Definitions
4. Symbols with their corresponding units, subscripts
    and index
5. Principle
6. Summary of the method
7. Review of measurements and calculations
8. Apparatus
9. Advance preparations
10. Preparatory work before sampling
11. Sampling procedure
12. Weighing
13. Method of calculation
14. Accuracy
15. Test report
Annexes
A. (normative) Factors affecting the accuracy of the
    method
b. (normative) Methods and rules for determining the
    position of sampling points in circular and
    rectangular ducts
C. (normative) Care and use of Pitot static tubes
d. (normative) Calibration of Pitot tubes
E. (normative) Recommendations regarding sampling
    locations not meeting the requirement of a straight
    duct length of seven duct diameters
F. (normative) Alternative method of determining the
    particulate mass flow rate in the duct
G. (informative) Bibliography
Tables
1. Symbols and their corresponding units
2. Subscript and index
3. List of equipment parts
4. Minimum number of sampling points for circular ducts
5. Minimum number of sampling points for rectangular
    ducts
B.1 Values of Ki as a percentage - General rule for
    circular ducts
B.2 Values of Ki as a percentage - Tangential rule for
    circular ducts
E.1 Minimum sampling location distances from obstacles
Figures
1. Illustration of definitions in relation to a
    circular duct
2. Isokinetic sampling
3. Example of a measuring equipment arrangement
    (see 8.2) without water removal upstream of the
    gas metering device
4. Example of a measuring equipment arrangement
    (see 8.2), with water removal upstream of the gas
    metering device
5. Diagram of measurement and calculation, with water
    removal before measurement of gas sample volume
6. Diagram of measurement and calculation, without
    water removal before measurement of gas sample
    volume
7. Example of shape of the nozzle (1)
B.1 Sampling point positions in circular ducts - General
    rule (showing positions for ducts over 2 m in
    diameter)
B.2 Sampling point positions in circular ducts -
    Tangential rule (showing positions for ducts over
    2 m in diameter)
B.3 Illustrations of sampling point positions in
    rectangular (and square) ducts
D.1 Schematic illustration of Pitot static tubes

Method for the measurement in confined spaces such as ducts, chimneys and flues. Can be used to determine concentrations ranging from 0.005 g/m³ to 10 g/m³. For concentrations under 00.50 g/m³ the inaccuracy of this method will be greater than ≠ 10%.