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.

Cosense SL-630 Series sensors are non-invasive point liquid level detectors that monitor fluid levels in syringes, drip chambers, reagent containers, and tanks. The sensor can be positioned by using a "peel & stick" adhesive interface feature, or it can be permanently integrated into OEM equipment such as medical devices, lab automation, dispensing, processing, and waste management systems.

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.

Flow Line Options features the EchoPod ultrasonic level switch, controller, and transmitter for low-cost, non-contacting monitoring and/or controlling of small tanks. The multi-function sensor provides 4-20 mA measurements, a 2" beam width, and 2" deadband optimized for small tank applications, and is ideal for use in corrosive or non-corrosive liquid level monitoring and control.

Futurlec carries a full line of ultrasonic sensors, which begins with the basic model and ends with several waterproof options. The basic ultrasonic sensor is ideal for use in alarm systems and object detection, and provides a sensitivity >-65 dB. The dual use compact sensor is suitable for range measurements, robot applications, and alarm sensors due to its 12 m detection range, while the long-range sensor has a detection range up to 18 m. Finally, waterproof models include the first and second generation waterproof ultrasonic sensors, as well as the 60 kHz version.

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.

Heaters, Controls, and Sensors Ltd. (HCS) offers small, compact LevelSonic ultrasonic level sensors capable of measuring solids and liquids. With an IP68 rating, hazardous certification, acid-inert Teflon nose, and tri-clover couplings, the sensors are appropriate for the water, petrochemical, chemical, and food industries.

HiTech's SonicLaser is an ultrasonic level measurement system that features a narrow beam angle to prevent false echoes caused by varying product build-ups on the vessel walls, and interference from agitation.  In addition to the basic sensor, SonicLaser units are also available as the multi-cont PR-100 two-part system, in which the electronics are remote from the sensor, thus allowing for multiplexing (i.e. one electronic unit with multiple sensors).

Instronics provides two types of close-range ultrasonic sensors, and several types of self-contained units. The plastic RPS-401 and stainless steel RPS-426 close-range sensors offer maximal ranges from 8" to 80" and LED indicators that illuminate green when not detecting and red when detecting. Self-contained sensors include the RPS-150 wide beam angle model that detects a flat target tilting up to 35 degrees; 409A-80 analog model, contained in a 30 mm PVC barrel housing; RPS-450/475 solid state proximity sensors; TBT/TBR-600 through-beam models that count up to 200 objects per second; and RPS-3000/4000 self-contained models with sensing ranges from 30' to 40'.

RS Hydro stocks various ultrasonic level sensors that withstand corrosion, dust, moisture, extreme temperatures, and vibration, from manufacturers such as OCM3, HydroRanger, and EnviroRanger. Selections include the Siemens Milltronics MiniRanger Plus, a short- to medium-range single vessel level monitor for liquids and slurries with reliable measurements up to 15 m; and the Probe, an ETFE or PVDF copolymer-constructed device for monitoring liquids and slurries in open or closed channels, as are found in storage vessels, mud pits, and filter beds. Other products include the SITRANS Probe LU for flow, volume, and level monitoring, the HydroRanger Plus and HydroRanger 200 controllers, and more.

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).

MaxBotix Inc manufactures the MaxSonar line of high performance ultrasonic rangefinders. MaxSonar sensor products offer easy-to-use short to long-range detection and ranging, beam matching factory calibration, all in one sensors that draw very low power consumption. MaxSonar sensor products do not have a dead zone like other ultrasonic range finders. Users can set the MazSensor products to match their specific application, or use a variety of factory calibrated settings.