Abstract: Sampling apparatus for periodically withdrawing small samples of liquid flowing through a pipe. The apparatus embodies an intake passage communicating with a T-section in the pipe. Liquid in the intake passage is pumped by a diaphragm which is pulsed pneumatically at periodic intervals. A check valve in the intake passage has one end projecting into the diaphragm chamber and is pushed positively by the diaphragm to intake port-closing position. A second passage communicating with the intake passage has a pop valve which opens under the diaphragm-created pressure after the check valve closes. Each periodic sample is collected from the latter passage in a plastic bag or other container. The apparatus can be washed and sanitized while on line by hose and coupling unit placed on the apparatus.

Abstract: Sampling device adapted for sampling of liquids with strata of varying composition embodying an elongated tube with a well cap loosely mounted on one end thereof, an elastomer cap with an air vent hole mounted on the other end thereof, and a second elongated tube adapted to contain sterilizing liquid and in which the sampling device is placed when not in use.