I would like to ask about the principle of a manual sampler
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I would like to know how the principle of a manual sampling device works. For viscous materials, how can the liquid material inside the long tube between the valve and the discharge port be completely emptied?
There is a plunger inside that moves inward toward the inner wall of the pipe when it is closed. The liquid material inside the cylinder is the residue left after sampling; once the plunger moves forward and the valve closes, most of this liquid can be drained (by gravity). A small amount may adhere to the inner surface, but it will be washed away when the valve is opened again, without affecting the authenticity of the sample.
Simply put, it’s a syringe; when needed, pull down the plunger to draw out the fluid inside!
Rely on gravity; if you want it to be very clean, add a purge