The WellMark, Cemco and Major names have been associated with quality products for the petroleum and petrochemical industries for over thirty years. Every WellMark, Cemco and Major product has been proven through testing and years of field experience to insure their quality, efficiency and long life. The complete line of control valves, pneumatic and electrical level controllers, safety relief valves, chemical pumps, liquid level indicators, switches and point level electronic controls provide the most cost effective product for your specific application.

Liquid Level Indication & Control

685I Liquid Level Indicator For Atmospheric Vessels

The Model 685I is a liquid head pressure type level indicator. It continuously indicates the liquid level in an atmospheric (vented) vessel, in feet and inches. Also, the scale of the Model 685I is available calibrated for horizontal cylindrical vessels or in pounds, gallons, barrels, etc. An elastomer diaphragm is the sensing element of the Model 685 I, and also separates the liquid in the vessel from the mechanical working parts of the unit.

685S Liquid Level Indicator For Atmospheric Vessels

The Model 685S is a liquid head pressure type level control. It continuously indicates the liquid level in an atmospheric (vented) vessel, in feet and inches, and has an adjustable switch which completes an electrical circuit to a solenoid, alarm, or other device when the level rises to the top predetermined point, and breaks the circuit when the level falls to the bottom predetermined point (or the reverse). Also, the scale of the Model 685S is

685E Liquid Level Transmitter With Local Indication

The Major Model 685E Liquid Level Transmitter is an electro-mechanical level control device, which accomplishes three (3) main functions. These are remote indication, local liquid level indication, and hi- to adjustable switch outputs. The Model 685E continuously indicates the liquid level and transmits a proportional signal.

685S “Snubber” Pulsation Dampener
For Major Level Control

The Major SNUBBER is designed to permit the installation of the Major Level Control on the pump suction line without being affected by surges when the pump starts or stops, or when any other condition results in rapid fluctuation of static head. Of the head type switches in common field use, only the Major Level Control is available with this built-in dampening feature.