Multichannel Systems
When large series of samples need to be analyzed simultaneously for several analytes, multichannel analyzer is a useful tool. The system comprises two or up to four individual channels which are daisy changed to share the same sample stream, supplied from automated sample changer. Typically ammonia, nitrate, phosphate and nitrite are analyzed with colorimetric detection.
Lachat Co. was the first (in 1981) fo introduce FI multichannel analyzer on the world market and its most recent version (QC 8500 ) is a workhorse of many routine laboratories. Two channel analyzer, designed by Garth Klein is based on unique construction of an injection valve which integrates two injection loops. This results in a very compact instrument (FIAlab 2500), reduces sample consumption and increase sample throughput.
It should be kept in mind that keeping multichannel systems functional is far more complex task then work with a single channel system, since the maintenance of multistream peristaltic pumps and other mechanical parts is demanding.
1.3.3.
