Exhaust
adjustment
Afterwards replace the inlet components with care making sure there is no leak.
4.2.2. Sheath Flow Check
The sheath flow is a constant stream of air which
ensures the optics remains clean. It is important this
is working correctly to maintain the accuracy of the
measurement. In order to check the flow, a
volumetric flow meter needs to be connected
between the purge flow adjuster and particle engine
as seen in the diagram.
Note 1: The flow should be greater than 0.5 LPM
4.2.3. Leak Check
If the correct sample or sheath flow cannot be
achieved, there may be a leak in the pump module or engine. First check the entire flow system:
Remove exhaust connection from the base of the enclosure
Remove the TSP head and block the PM inlet.
Connected the pressure end of a flow meter to the exhaust tubing.
If there is no leak the flow should drop to zero.
If the flow does not drop to zero it suggests there is a leak somewhere in the system. To check the
pump module:
Remove the sample connection and cap off the module sample port.
Connect the exhaust port of the module to the pressure end of a flow meter.
The flow should drop to zero.
If there is a leak in the pump module the module will need to be sent back to the Aeroqual factory.
Please contact technical support.
If there is no leak in the pump module it is likely the leak is located in the engine. In this case, the
engine will need to be sent back to the Aeroqual factory. Please contact technical support.
9722-1 engine
