Level Sensors, Transmitters & Switches

We know level!  We have been selling and commissioning all types of level sensors switches and transmitters for liquids, bulk solids, interface and sludge level detection for years with the technologies and sensor types below.

FMP50, VF03, BM102, levelflex, level, transmitter, E+H, Endress, Hauser, Hycontrol, Optiflex, Krohne, Vega
TDR, Guided Wave Radar

Guided wave radar level transmitters utilize the some of the best technology available for continuous level measurement and interface level measurement.

Guided wave radar works with high-frequency radar pulses which are guided along a probe. As the pluses impact the medium surface, the characteristic impedance changes and part of the emitted pulse is reflected. The time between pulse launching and receiving is measured and analyzed by the instrument and constitutes a direct measure for the distance between the process connection and the product surface.


  • Reliable and maintenance-free measurement in liquids, also in turbulent media and foam.

  • Unaffected by density, temperature, conductibility, or humidity.

  • No impairment by outgassing media (steam pressure).

  • Process temperatures up to +750 °F

  • Process pressures up to 5,800 PSIG

Hycontrol, Siemens, Ultrasonic, Microflex, reflex, multiflex, liquiflex, sitrans, miniflex, sonarflex

Non-contact ultrasonic level measurement is one of the most versatile level measuring technologies and is suitable for both liquids and solids measurement. It can be used for continuous or point level detection. The principle of operation is often referred to as 'time of flight'.
An ultrasonic pulse is emitted from a transducer down towards the media and is reflected back from the surface. The time it takes to travel from and to the transducer is directly proportional to the distance traveled



  • Low cost

  • Wide range of applications

  • Simple to install

  • Non-contact, long measuring ranges - up to 196 Ft.


Pellets, Granules, Slurries, Pastes and Liquids.

Berthold, continuous, switch, level, sugar, pan, autoclave, high temperature,
Nuclear / Radiometric

Berthold's level systems are used to monitor measuring ranges, ranging from a few millimeters up to several dozen meters.  The radiometric level measurements are non-contacting and non-intrusive. As the components are mounted on the outer wall, they do not come into contact with the measured material and are therefore not exposed to wear and tear.

The level transmitters are universally applicable on all kind of vessels, reactors, autoclaves or bunkers.

Gamma radiation, emitted from a shielded source is attenuated as it passes through the vessel. This attenuation is measured by a highly sensitive detector, mounted at the opposite side of the vessel. As type of radiation and measuring geometry are constant the attenuation will only be affected by a change in level.

The continuous measurement of level uses a radiation field over the whole measuring range. If the level rises within the range of the radiation field, the attenuation becomes stronger and consequently the detector measures less radiation. In this manner, the level can be reliably monitored - irrespective of pressure, temperature, viscosity, color and all chemical properties.

E+H, E&H, Endress, Hauser, Micropilot, FMR, non, contacting, vega, radar, air, krohne, output, hart
Non-Contacting Radar

Radar works with high-frequency radar pulses which are emitted by an antenna and reflected from the product surface. The time of flight of the reflected radar pulse is directly proportionate to the distance traveled. If the tank geometry is known, the level can be calculated from this variable.

Non-invasive, maintenance-free measurement also under extreme conditions.
Unaffected by density, temperature, conductibility and humidity.
No impairment by outgassing media (steam pressure).

Process temperatures up to +750 °F

Process pressures up to 2,320 PSIG

Hycontrol, Proximity, Dwyer, Endress, Hauser, E+H, E&H,
RF / Capacitance

A solid-state level sensor for detecting the level of liquids and solids. The probe consists of a sensing element and an integral grounding sleeve that is separated by an insulator. There is a fixed capacitance between these two elements and this will change when product comes into the vicinity or contacts the sensing probe. The sensor will then detect this change and change the output. This method of detection relies on the dielectric properties of the media. The higher the dielectric the easier it is to detect (water has a value of 80+ and air is around 1)



  • Universal for liquids and solids, low maintenance technology, unaffected by temperature, pressure.

  • Corrosion resistant and a wide range of mounting options.

  • Relatively low cost.


Liquids, slurries, powders, pastes, granules, pellets and can also be used for interface detection in applications such as oil and water.


Hycontrol, Royce, Sonarflex, sonar, sludge, hawk, clarifier, monitor
Sludge Blanket Level & Interface Monitoring

Sludge blanket and interface controllers are a microprocessor based transmitters combined with a high power sonar transducer.

Monitor and control the blanket level in settlement tanks for a wide range of industries on applications including:

  • Primary Sedimentation - Sludge blanket levels

  • Secondary and Final Clarifiers - RAS blanket / FLOC level / Clarity

  • Sludge Thickeners - Settling blanket level / Clarity suspended solids

  • DAF Tanks - Settling blanket Level / Floating bed level

  • Sequential Batch Reactors (SBR) - Settling blanket level / RAS blanket

  • Lammella clarifiers- Settling blanket level / Clarity suspended solids

  • Counter current decantation (CCD) tanks - Blanket level / FLOC / Clarity

  • Mining and Process settling ponds, lagoons, tailings dams, carbon columns


Hycontrol, Royce, Sonarflex, sonar, sludge, hawk, clarifier, monitor
Tuning Fork / Vibration Switches

Tuning fork style switches use a piezo-electric crystal that enables the switch to vibrate at a fixed pre-defined resonant frequency. When the tuning fork is submerged in the medium the frequency at which the switch is vibrating, changes. This change is detected by the unit’s electronics and is converted into a switch output, either relay (SPDT) or PNP/NPN (depending on the model). 

All models are made with 316 Stainless Steel and are available with Halar or epoxy coatings and hygienic fittings for sanitary applications. Standard versions can operate at temperatures up to 176º F and higher temperature versions can operate at temperatures up to 248º F.  Most models  have adjustable time delay adjustments as well as a Wet / Dry selection for both High and Low level application requirements.

Utah Residual Chlorine Monitor, Q46H, Q45, ATi

The ATi model Q46H Chlorine Monitor (Analyzer, Transmitter) system uses a polarographic membraned sensor to measure chlorine directly, without the need for chemical reagents.

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A-T Controls has made a name for themselves with their valve products.  In addition to ball valves, they manufacture butterfly valves, electric and pneumatic actuators and valve accessories.  With their complete line of valves they have a product offering sure to meet your requirements.

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