Madison Co. offers a variety of ultrasonic level sensors, including: sensors with a range of up to 90', sensors with an LCD display, and compact/short range sensors. Sensors have voltage ratings ranging from 18 to 24 VDC, resolutions ranging from 0.04" to 0.27", and a maximum operating frequency of 180 kHz. Housing material options include: Aluminum PVC-94V0, POM rings, stainless steel, tempered glass, etc.

Four types of ultrasonic sensors: Barrel sensors come in 12, 18, and 30 mm diameters, as well as in plastic or metal housing, and provide proximity, analog, or dual-level sensing. Dual mount sensors are 18 mm diameter, and can be configured with a flat profile for specific mounting needs, while miniature flat profile sensors are 33 mm x 12 mm and offer ranges up to 304.8 mm. Tthe subcompact flat profile sensor is 74 mm x 30 mm with a standard silicone rubber face and sensing window up to 305 mm.  UL, CE, and RoHS approved.

Baumer Ltd. offers a variety of ultrasonic sensors with many performance options. Product families include proximity sensors with switching output, through beam sensors, retro-reflective sensors, and distance measuring sensors, while sensing distance maximums begin at 100 mm and go up to 3,000 mm. Sensors come in either cylindrical or rectangular types, and can come with special features like chemical resistance and 2 switching points. Response times are all <160 ms.

SICK manufactures several models of ultrasonic sensors, including the UM30-2, UM18, UC4, and UM18. The UM30-2 has short housing and increased measurement performance, with 0.18 mm resolution and 6,000 mm sensing range. Next, the UM18 is housed in metal and meets IP67 standards, while the UC4, the company's smallest ultrasonic sensor, provides excellent detection of optically difficult targets (e.g., shiny, clear, etc.) up to 250 mm away. Finally, the UM18 is a double sheet detector for use with foils, metal sheets, and ultra-fine corrugated cardboards; it has an operation area of 40 mm +/-3 mm.

Automation Direct offers three lines of ultrasonic proximity sensors. First, the SU Series are 18 mm plastic sensors with adjustable ranges of 100 to 600 mm and 200 to 1,500 mm. They feature complete overload protection, LED status indicators on DC models, and IEC IP67 rating. Second, the TU Series of 30 mm proximity sensors has a sensing range from 300 to 2,500 mm, in addition to many of the same features as found on the SU models. Lastly, the UHZ Series are rectangular, miniature sensors with dimensions of 30 mm x 20 mm x 12 mm. Within this series are four models of through-beam sensors for applications with limited mounting space.

Engineering & Manufacturing Services offers Sonarange ultrasonic sensors with a variety of ranges and configurations. The basic SR Series comes in four models with different sensing ranges: the SR6 (10"-72"), SR12 (12"-144"), SR25 (18"-300"), and SR35 (18"-420"). Other options include the Sona Prox ultrasonic proximity sensor that has a range of either 5" to 12" or 10" to 24", 25/s update range, and +/-2% accuracy; Sonarange dual close proximity ranging sensor, with 0.5" to 2" or 2" to 12" range, 100/s update range, and +/-2% accuracy; and Sonarange TBS through-beam ultrasonic switch that senses up to 48".

Omron Industrial Automation features ultrasonic sensors to enable stable detection of transparent objects, such as films, glass bottles, plastic bottles, and plate glass, using through-beam or reflective sensors. The E4C-UDA digital amplifier ultrasonic sensor handles targets of all types, colors, and patterns, with a total measurement range from 50 mm to 1,000 mm and response speed range from 30 ms to 125 ms. The E4B uses an ultrasonic beam (<8 degrees) to detect objects as small as 2 cm x 2 cm at a distance from 5 cm to 1 m, while the E4C is a column-shaped sensor that comes in either through-beam or reflective sensing methods. The final ultrasonic sensor is the E4A-3K unit that has an adjustable sensing distance of 0.3 to 3 m; its operate time is 0.25 s and its release time is 0.5 s.

Allen-Bradley ultrasonic sensors are self-contained, solid-state devices for non-contact sensing of solid and liquid objects. The 873C proximity style sensor has a range up to 1 m, and is able to monitor the level of water in a tank or complete similar tasks. The 873P analog/discrete output sensor is meant for sensing solids and liquids, while being protected against shock, vibration, and contamination. Available in 18 and 30 mm barrel diameters, they are constructed from PBT plastic and meet IP67 enclosure standards. The 873E RightSound sensors are designed for demanding environments,  constructed from FDA-compliant silicone rubber for maximum durability and protection, and rated for 1,200 psi washdown and NEMA 4X and 6P standards.

Contrinex manufactures five models of ultrasonic sensors with diverse operating principles. It starts with diffuse and reflex sensors, with their cubic 40 mm x 40 mm housing size and 0 to 200 mm sensing range. Next, the diffuse sensor is M18 size with a range from 0 to 700 mm, while the diffuse sensor with background is M18C size with a range from 100 to 700 mm. In housing size M18W is the reflex sensor, which offers a range of 150 to 1,000 mm, and in size M30 is the through-beam sensor, for sensing objects within a 200 to 1,300 mm range.

Finemech carries a full line of PIL ultrasonic sensors for detecting targets made of almost any material, even in difficult environments. The low-cost P43 tele-teach sensor allows sensing points and switching points to be defined and varied between 60 mm and 6,000 mm. Also available are P43 tele-teach compact rectangular form sensors and sensors with minimal dead range (<3 mm), as well as the P41 teach-in flat form sensor, made of PBTB housing in IP76 and IP65 protection classes, with sensing distances from 60 mm to 3,500 mm.

Both ultrasonic proximity and level sensors are carried by Gordy's Sensors. The TDLS01 Series sensors combine ultrasonic technology with a micro controller for improved performance in aerated liquids, including repeatability of 2 mm or better and pressure tolerance up to 250 psig. Several RPS Series sensors are available, as well, such as the high accuracy, analog RPS-412A (+/-0.002" or 0.05% of range at 25 degrees Celsius), and the self-contained, wide beam angle RPS-150, which can detect flat targets up to 35 degree tilts.

Senix Corporation specializes in non-contact, ultrasonic distance sensors for research and development, machinery, and industrial automation. The company sells both to end users and OEMs, and is capable of custom designs to meet special requirements. Their newest product is the ToughSonic, which is a push-button teachable and PC-configurable sensor that is able to measure distances up to 15.2 m with 0.1% of range nominal repeatability (at constant temperature).