FIG. 7.8.4 Ultrasonic homogenizer. (Reprinted, with permission, from Cole-Parmer Instrument Co.)

FIG. 7.8.5 Intermittent collection of samples. (Reprinted, with permission, from Bristol Equipment Co.)

this sampling frequency is constant, while in flow-proportional mode, this unit varies sampling frequency as a function of flow.

In some automatic liquid samplers, sampling frequency is adjusted by pneumatic pulse relays or electronic controls. Pulse duration is usually adjustable from 0.25 sec to 1 min, while pulse frequency is adjusted from a few sec up to an hr.

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