Correction for the number of pump strokes
Make the following correction when measurements were made for a number of strokes other than the
specified number.
Some detector tubes can measure concentrations beyond the printed scale. The Gastec Technical
Handbook (HBE) shows each available tube range of concentration for measurement (measuring
range), the number of pump strokes (n) required and if applicable the stroke correction factors. (see
example GAS3L on the next page below). Multiply the indicated value by an appropriate factor to
obtain the true concentration. However, since the correction factors are fixed in specific numerical
values, precise results may not be obtained as in the case of measurement with the standard number
of strokes when measurement is made by a number of strokes other than the standard number. Use
the results obtained using a correction factor as a reference only.
