Tape Sensor Calibration; Flow Verification - MAGEE Scientific Aethalometer AE33 User Manual

Aethalometer
Model AE33

9.8 Tape Sensor calibration

The amount of tape on the "Supply" and "Collection" spools is determined by two optical
sensors which measure the diameter of each roll. These sensors are in the form of small
optical lenses on each side of the Analysis Unit headframe. The Tape Sensors should be
cleaned periodically (once a year if the instrument is not installed permanently in a
monitoring station); and their measurement response must be re-calibrated if the Analysis
Unit is ever removed from the instrument and re-installed. This procedure requires the
special Spool Diameter Calibration Cylinders (see section 15 Accessories, PN M3410)
which are two cylinders covered with filter tape. The smaller cylinder has a diameter of 39
mm; the larger cylinder has a diameter of 102 mm.
To re-calibrate Tape Sensors, first stop the measurements. Next, select the "TapeSenAdj"
button on the Operation/Advanced screen, and follow the on-screen instructions which
require installing the calibration cylinders alternately on both spools. Note that it is essential
to cover the calibration cylinders with the clear plastic spool front-plates during the
calibration process, for correct optical response.

9.9 Flow verification

The Flow Verification routine allows the operator to check if the internal flow sensors are
responding accurately. No instrument settings are changed during the flow verification
process. The process is also shown on the video library available on the Magee Scientific
website.
1. This test requires the black rubber Flow Calibration Pad (supplied with every instrument;
PN M3420); and an air mass flow meter connected externally to the sample inlet port.
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User's manual – Ver. 1.55 July 2017 79/146