Common use of Measuring scales Clause in Contracts

Measuring scales. 3.5.1 The light-absorption coefficient k shall be calculated by the formula ∅ = ∅o e-kL, where L is the effective length of the light path through the gas to be measured, ∅o the incident flux and ∅ the emergent flux. When the effective length L of a type of opacimeter cannot be assessed directly from its geometry, the effective length L shall be determined Either by the method described in paragraph 4. of this annex; or Through correlation with another type of opacimeter for which the effective length is known.

Measuring scales. 3.5.1 The light-absorption coefficient k shall be calculated by the formula ∅ i = ∅o io e-kLkL , where L is the effective length of the light path through the gas to be measured, ∅o io the incident flux and ∅ i the emergent flux. When the effective length L of a type of opacimeter cannot be assessed directly from its geometry, the effective length L shall be determined Either by the method described in paragraph 4. of this annex; or Through correlation with another type of opacimeter for which the effective length is known.