4 | Product description
D-R 290
47
Op
Opacity at the measuring point (value corresponding to a single pas
sage)
Op1
(measured) opacity at the measuring point
(value corresponding to a double passage;
Op2
Opacity at the flue stack opening
(value corresponding to a single passage)
L1
Diameter of the flue stack at the measuring point
L2
Diameter at the flue stack opening
PLCF
Path length correction factor (flue stack correction factor)
Table 4.4: Legends in the formulae
Table 4.5: Flue stack correction factor
Equation
4
Table 4.6: Equation 4
Based on the (measured) double attenuation of the measurement light at the measur
ing point, we have the following relationship:
Equation
5
Table 4.7: Equation 5
Flue stack mouth
Measuring point
Fig. 4.9: Reference points for determination of the opacity
Summary of Contents for D-R 290
Page 12: ...12 D R 290 ...
Page 18: ...1 General 18 D R 290 ...
Page 20: ...20 D R 290 ...
Page 28: ...2 Safety 28 D R 290 ...
Page 30: ...30 D R 290 ...
Page 38: ...3 Delivery 38 D R 290 ...
Page 40: ...40 D R 290 ...
Page 60: ...4 Product description 60 D R 290 ...
Page 106: ...106 D R 290 ...
Page 152: ...152 D R 290 ...
Page 174: ...8 Maintenance 174 D R 290 ...
Page 176: ...176 D R 290 ...
Page 178: ...9 Appendix 178 D R 290 Fig 9 2 Measurement point questionnaire 2 ...
Page 194: ...9 Appendix 194 D R 290 ...
Page 200: ...11 Index 200 D R 290 ...
Page 202: ...GmbH Kollaustraße 105 22453 Hamburg Germany www durag com ...