Solinst 408M Micro Double Valve Pump ATC and control boards for the

and control boards for the Mk3/Mk4/Mk5 versions

Keeps the glass membrane and reference junction moist for fast response and accurate readings

renowned for its portability and ease of use

groundwater wells

Solinst 408M Micro Double Valve Pump ATC and control boards for theThe Solinst 408M Micro Double Valve Pump miniaturizes the same double check valve pumping principle as the 408 into a flexible, coaxial PTFE tubing assembly only 3 8" in overall diameter. A small filter pump body at the intake fitted with a sintered 316 stainless steel 50 micron screen feeds formation water into both an outer annular drive line and an inner 3 16" sample line. Compressed gas cycled down the annulus by a surface control unit closes a