ISOLOK automatic samplers draw measured portions of liquids or slurries on command from electrical or all-pneumatic controls. The sampler taps process streams moving through pipes or vessels pressurized up to 300 psi, as well as troughs or tanks. The sample path remains completely enclosed to avoid spillage, sample or process contamination, and exposure of personnel or plant environment. Standard units draw samples of 3cc, 8cc, 10cc, or 25cc by positive displacement with each cycle, with custom sample sizing available. A wide range of cycle controls is offered, including automatic time-base, flow-proportional, manual cycling and PLC interface modules. The sampler mounts through an access port installed on the process equipment. The sampler body encloses a plunger that extends to penetrate the process stream then immediately withdraws. Samples are trapped in an annular ring at the end of the plunger, drawn into the sampler body and transferred directly into an attached container or transfer line.