Teledyne Advanced Pollution Instrumentation | Model 633 Aethalometer® Black Carbon Monitor User Manual |
FLOWMETERS
Two flow meters measure the airflow in different points in the system. One of them is used also in the air flow regulation loop.
SOLENOID VALVES
Three solenoid valves are used to switch the airflow through different airflow paths when the instrument is set in different operating modes like measure, tape advance or similar.
CHAMBER LIFT MECHANISM
The chamber lift mechanism allows the measurement chamber to be lifted manually or electromechanically. During tape advance the automated chamber lift procedure is invoked. During tape replacement the manual chamber lift procedure can be engaged. The manual chamber lift mechanism features also a special locking mechanism which simplifies the tape replacement or chamber cleaning procedure. The main electronic components of the chamber lift mechanism are the stepper motor and the chamber lift position sensor.
TAPE ADVANCE MECHANISM
The advance mechanism allows the instrument to perform automatic tape advances during measurements. The main electronic parts of the tape advance mechanism are a stepper motor and the two tape sensors.
ROLLON and UNROLL TAPE SPOOLS
The roll‐on and the un‐roll tape spools hold the measurement tape. During automated tape advance the tape unrolls from the un‐roll spool and rolls on the roll‐on spool. If the un‐roll spool is empty, the event is detected automatically thanks to the tape sensors. The tape replacement procedure must be performed manually by the operator. The measurement tape is one of the main parts of the system.
TAPE SENSORS
The two tape sensors are used by the instrument software to detect the amount of tape on the un‐roll and roll‐on spools.
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