Measurement zone

The flow cell houses the measurement zone of the analyzer. A laser beam shines across the powder stream as it moves through the cell area. The laser shines through glass (or sapphire, for abrasive powder applications) windows with special anti-reflective coatings protect the instrument electronics from the powder stream. There are two windows, one for the transmitter (which houses the laser) and one for the receiver (which houses the photodetectors). An air purge on each window protect condensation from fouling them.

There are two flow cells available:

• standard cell
  this is a measurement cell which is common to our laboratory systems. It has been proven in thousands of analyzer systems world wide.
  
• maxflow cell
  this measurement cell is for larger particulate samples and has a wider path length than the standard cell.