Wellmark Series 790 Major-style side-mounted liquid level control - This device works on positive magnetic repulsion to complete an electrical circuit to pump, valve, alarm, or other device, when the liquid level rises or lowers to a predetermined point.
 

Wellmark Series 683, 686, 687 Major-Style float switch - This switch is a float-type control that completes an electrical circuit to a pump, valve, alarm, or other device, when the liquid level rises or lowers to a predetermined point -- 2 psi (atmospheric) to 1440 psi.
 

Wellmark Series 688 - This major-style single point on/off switch, which completes a circuit to a pump, alarm, valve, or other device, senses virtually any liquid and does not need adjustment when the vessel contents are changed. It will ignore foam, surge, or splash to indicate true level, with repeatability to 0.050 in. standard.

Wellmark Series 710, 720, 730, & 740 Float Operated Units - are designed for external mounting to the process vessel and provide high pressure capabilities with low specific-gravity ratings within the petroleum, power, and natural gas industries. These models provide reliable magnetic switching for level alarm or control function applications. CSA Approved, Class I, Division I, Groups C & D; Class II, Groups E, F, & G; Class III, Enclosure Type 4.

Wellmark Series 770 Major-Style side-mounted float operated liquid level switch magnetically actuates an externally located electrical switch, eliminating conventional seals. (Contact factory for details)

Series 780 Major-Style Hermetically Sealed Level Control - This unit is a side-mounted float-type control used for high-low level controlling; can be used to sound alarms or operate control equipment.

 Series 810 Major-Style Hermetically Sealed Level Control - Vertically-mounted switch used to monitor flow-vs-no-flow. Its purpose is to operate valves, alarms, control pumps, or any other electrical function.