Standard solutions for calibration cost $100 per bottle; laboratory turbidity meters cost from $600 to $1000; laboratory nephelome-ters with a continuous-flow attachment cost $1500; and process industry transmitters cost from $2000 to $4000 depending on the features and materials of construction. A sludge-density-detecting, self-cleaning probe with an internal reciprocating piston and indicating transmitter costs $6700.

FIG. 7.9.3 Self-cleaning, fiber-optic probe used in consistency measurement. (Courtesy of Kajaani Electronics Ltd., Finland)

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