Displacer

Displacer level switches are sensors with an electrical contact output at a specific liquid level. Models are suspended on a coil spring. Displacers are not affected by turbulence or pressure and are excellent for applications with viscous or dirty liquids. Applications include foaming liquids, heavy oil refineries, paints & varnishes, and chemical plants.

Series 190 Single Stage Top Mount Displacer Type Level Control

Fixed or Adjustable Deadband, For Pumps or Alarms

The most versatile liquid level controls in our line, displacer controls can be used to trigger alarms, provide shutdown or operate pumps.

Operation: Mercoid® Displacer Controls use displacers that do not float on the surface of liquids, but are suspended on a coil spring. They work on the principle that submerged solids weigh less in liquids, and as the liquid level rises and their weight decreases, the tension on the spring by which they are suspended is decreased. This allows the spring to move the cable and armature upward, actuating the hermetically sealed switches. Because they work on a different principle than float type liquid level controls, displacers are not affected by turbulence, or pressure, and are excellent for applications with viscous or dirty liquids.

Dimensions are based on 316SS displacers with 4" minimum flange type control. All dimensions are approximate and will vary depending on specific gravity, temperature, displacer material and size. Critical dimensions must be verified with the factory before placing order.

Standard Construction: 316SS displacers, 10 foot 316SS cable and stops, 49 125# CI flange: for operation in specific gravities as low as 0.5 and a maximum temperature of 200°F (93°C). For special conditions, other choices include: 316SS displacers: longer cable: monel or hastelloy cable and stops: other flange sizes, materials or pressure ratings, or 3/4" NPT top connection in lieu of flange.

Product Applications

Pumping stations
Foaming liquids
Sanitary/sewage treatment
Paints & varnishes
Agitated or turbulent fluids
Heavy oil refineries
Chemical plants
Power generating stations
Viscous or dirty liquids

Features

Extremely versatile design
Displacers are suspended on a coil spring and do not float on the surface of liquids and are unaffected by turbulence or pressure
Excellent for applications with viscous or dirty liquids

Series 195 Two Stage Top Mount Displacer Type Level Control

Fixed or Adjustable Deadband, For Pumps or Alarms

One of our most versatile level controls, the Series 190 can be used on all types of tank or sump level control applications.

Mercoid® Displacer Controls use displacers that do not float on the surface of liquids, but are suspended on a coil spring. They work on the principle that submerged solids weigh less in liquids, and as the liquid level rises and their weight decreases, the tension on the spring by which they are suspended is decreased. Because they work on a different principle than float type liquid level controls, displacers are not affected by turbulence or pressure, and are excellent for applications with viscous or dirty liquids.