WellMark Series 685
 

Major 685	Major 685E

Wellmark Series 685 Liquid Level Indicator Switches continuously indicate the level of liquid in an atmospheric (vented) tank in feet and inches. As an option, the tank can be calibrated for horizontal tanks or for measurements in pounds, gallons, barrels, percent, etc.

Click on the name of any given controller to open/download a PDF spec sheet for the controller in question.

685 Series General Brochure

This file provides a general overview of the level controllers presented below; for more detailed information or for more specific-use designs, please see the individual level controllers' data sheets.

685-I

A liquid head pressure type level indicator, capable of performing the most indication tasks.

685-S

Similar to the 685-I, but with a built-in electrical switch (adjustable), which completes an electric circuit when the level rises above a certain point and opens the circuit when the level falls below that set point.

685-M

The M stands for Multiswitch; it continuously indicates the liquid level and turns the pump on and off as adjusted. Each switch may be set at different set points to control a separate device, such as an auxiliary or motor control relay, alarms, etc.

685-E

The Model 685-E is an electro-mechanical level controller, which accomplishes three functions: Remote Indication, Local Indication, and high-low adjustable switching. The unit continuously indicates the liquid level and transmits a proportional signal. (Housing is weatherproof and explosion-proof).

685-ER

The 685-ER is an Electronic Remote Readout meant to be installed in conjunction with 685-E models, providing a remote panel for viewing liquid levels.

Options for 685 Switches

This PDF file details the available options for a hydrostatic level control. Among the accessories is a Snubber, which is designed to permit installation of a Level control on the pump suction line without being affected by surges from pump starts and stops, or when any condition results in rapid fluctuation of static head pressure. Of the head-type switches available in the field, ONLY the Major Level Control is designed with this built-in dampening feature.