Ecotech Acoem Serinus 30 - Page 120

Serinus® 30 User Manual 3.3
Page 120
There are several different types of checks/calibrations performed:
 Level 1 Calibration – A simplified two-point instrument calibration used when instrument
linearity does not need to be checked or verified. This check is typically performed on a
monthly basis. Adjustments to the instrument response can only be made when
performing level 1 calibration.
 Level 2 Calibration – A simple check of the instrument’s response. Level 2 checks may be
performed using non-certified reference sources and are most often used as a
performance monitoring tool. The instrument may not be adjusted
 Multipoint precision check – A series of calibration points, typically covering zero and 5 up-
scale points, measured using a certified reference atmosphere and covering the
instruments FS measurement range. These precision checks are used to determine the
linearity of the instrument response across its measurement range.
In general terms, the calibration process includes the following steps:
1. Establish a reliable and stable calibration source.
2. Provide a satisfactory connection between the calibration source and the instrument.
3. Calibrate the instrument against the calibration source.
Multipoint precision check is used to establish the relationship between instrument response and
pollutant concentration over the instrument's full scale range. Zero and span calibrations are
frequently used to provide a two-point calibration or an indication of instrument stability and function.
Note: Zero calibrations are not recommended by Ecotech, but may be performed when specifically
required by a user. Zero calibrations tend to mask issues that should be addressed during
maintenance/service.
Regulations generally require that the instrument be span calibrated any time:
 The instrument is moved.
 The instrument is serviced.
 When changing the instruments units between volumetric and gravimetric.
 Whenever the instrument characteristics may have changed.
Regulatory agencies establish the time intervals at which the instrument must be calibrated to ensure
satisfactory data for their purposes.
Note: Use of the Serinus 30 analyser as a U.S. EPA or EN-designated equivalent method requires
periodic multipoint precision checks in accordance with the procedure described below. In
addition, the instrument must be set to the parameters indicated in U.S. EPA (refer to Section 2.4)
or EN Equivalent Set-up (refer to Section 2.5).