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BA314001-en
5 Calibration
The analyzer has been factory calibrated to deliver a linear output directly proportional to the
concentration of PM. Given the linearity of response, a simple "Zero and Span" check provides
an excellent and rapid confirmation of calibration status. The supplied calibration generates the
span response. The procedure follows:
1 Perform the "Warm up" and "Zero Adjust" procedures above.
2 Put the instrument in "Continuous Measuring" mode (see above), with the sample probe
resting in relatively clean air (i.e., not downstream of any vehicle exhaust).
3 Remove the operating plug from the rear panel of the analyser by rotating it counter-
clockwise and then pulling directly from its socket. If the plug has not been removed for
some time, it may require a firm pull to overcome O-ring friction. Occasional light application
of O-ring grease will help to avoid this.
Fig. 4: Calibration Plug (left) and Operating
Plug (right)
4 After carefully cleaning the calibration plug using a lint-free cloth (
DO NOT use paper
tissue
), insert the calibration plug and rotate clockwise until it is firmly engaged on the stop
pins. Ensure that the plug is oriented so that painted dot on the back face of the calibration
plug is aligned with the dot on the instrument case.
Fig. 5: Back Face of Calibration Plug
5 Confirm that the reading on the screen is approximately the same as the label on the
calibration plug (±10%).
