BVS has over forty (40) years experience in the design and manufacture of automatic samplers. All BVS samplers are warranted for a period of two (2) years from the date of installation. BVS can custom design a sampler to meet your special requirements. The BVS model SPE-400 electro-pneumatic, composite sampler is our most popular model, as it is virtually maintenance-free, with a standard lift of eighty (80) feet, with higher lifts available. All BVS samplers can take samples by the built-in manual timer or flow-proportionally when supplied with a dry contact closure or an optional signal converter to accept a 4-20 ma flow signal.