MAGEE Scientific Aethalometer AE33 User Manual page 28

Aethalometer
Model AE33
PULSE DAMPER
The pulse dumper (CRC) decreases pump pulsations in the internal airflow, which would
otherwise perturb the very sensitive optical measurements.
DIAPHRAGM PUMP
The suction pump draws the sample air stream into the inlet connector and through the
analytical filtration area. Its speed is under closed-loop software control to stabilize the sample
flow rate to the desired flow set point.
FLOW SENSORS
Two flow-sensors measure the airflow in the two sampling streams. Their data is used in the
BC calculation as well as for the closed-loop flow stabilization.
SOLENOID VALVES
Three solenoid valves are used to switch the airflow through different paths according to
instrument operational settings.
CHAMBER SLIDES AND LIFT MECHANISM
The vertical slides (linear bearings) allow the measurement chamber to be lifted manually or
electromechanically. When raised manually, a locking latch on the top of the chamber holds it
in the raised position. A stepper motor and cam raise and lower the chamber under instrument
control for automatic tape advance, or under manual control. A position sensor provides
feedback to the software to confirm correct operation.
TAPE ADVANCE MECHANISM
The Tape Advance components allow the instrument to perform automatic tape advances
during measurement operation. The primary components are a stepper motor on the
"Collection" spool, and two tape sensors.
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User's manual – Ver. 1.55 July 2017 28/146