HF scientific MicroTOL Online Turbidimeter old series- 0-1000 NTU - Manual (Page 10)

MICRO TOL (12/04)
Rev. 2.7 4
1.4 Vapor purge
The Micro TOL is equipped with a continuous vapor purge system. A replaceable
desiccant pouch in the lower portion of the instrument dries the air. System heat is used
to warm the air. A fan inside the instrument continuously circulates heated dry air around
the optical well and the flow through cuvette. This feature eliminates the need for a dry
purge line.
The Micro TOL monitors the replaceable desiccant pouch condition continuously. The
LCD display will show DESC on the lower line in the event that the desiccant pouch
needs replacement. Replacement desiccant pouches are available from HF scientific, inc.
or your local representative (part # 21555R).