The BM 51 Level gauges are used for measuring liquid
levels in open-topped or pressurized vessels and tanks.
Operating principle: Both instruments operate on the float principle. A float with built-in magnet system is guided on a non-magnetic tube. It follows the liquid level in the vessel, thereby causing the magnet system to move the follower magnet inside the tube. Changes in level are
transmitted via a flexible wire cable to a measuring drum. The weight of the follower magnet is balanced by a spring motor. System operation is thus non-interacting. The indicating device and data transfer system are actuated by the measuring drum via a toothed gearing.

Special features
Simple, rugged construction
Up to four electronic limit switches
Protection category IP 56,equivalent to NEMA 3
Measuring range 1.5 to 6 m (5 to 19.68 ft)
Connection flange DN 80, PN 16 DN 50, DN 100–DN 200 / PN 6–40 2”-8”, 150–300 lb
Process temperature–200 … +400°C(–328 … +752°F)
Accuracy ±3mm of full scale range