MAGEE Scientific Aethalometer AE33 User Manual page 29

Aethalometer
Model AE33
'TAPE SUPPLY' and 'TAPE COLLECTION' SPOOLS
The Filter Tape Roll is installed on the Supply (left-hand) spool and threaded through the
Analysis Chamber area and onto the Collection (right-hand) spool. The Collection spool axis is
turned by a motor to pull the tape forwards during the Tape Advance process. Optical sensors
observe both tape rolls: data from the sensor observing the Tape Supply spool is used to
estimate the quantity of tape remaining; and also to detect the 'End-Of-Tape' condition when
the spool center is uncovered
TAPE SENSORS
Optical sensors on either side of the Measurement Head Bracket observe the tape spools and
detect the amount of tape on each spool.
OPTICAL SOURCE
The Optical Source consists of arrays of LED chips of different emission wavelengths.
OPTICAL DETECTORS
The Optical Detectors quantitate precisely the amount of light passing through the two spots on
the filter tape. Their data is digitized and passed to the Software to calculate the Black Carbon
concentration in the sampled air stream.
FRONT PANEL DOOR
The front panel door provides access to the operational area for tape replacement or chamber
cleaning. It is hermetically sealed to reduce contamination by dust.
DOOR KNOB
The push-pull knob secures the front panel door. Pull to open the door; push to latch it closed.
DISPLAY and TOUCH-SCREEN
The display and the touch-screen are the primary user interfaces of the instrument, and offer all
functionality and operational control.
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User's manual – Ver. 1.55 July 2017 29/146