Series PLT Ultrasonic Level Transmitter Continuous, Noncontact, 4 to 20 mA Output Series UL Ultrasonic Level Transmitters provide continuous noncontact sensing for level control of liquids or slurries. The sensor emits an ultrasonic pulse which is reflected back to the sensor at the liquid/air interface. The distance traveled by the pulse is calculated and converted into a 4-20 mA output signal. Internal microprocessor performs self diagnostics to indicate possible operating problems such as out-of-range or loss of echo. Failsafe feature can be set to deliver a 3 or 21 mA output in the event the echo is lost. Model Number Description UL100 UL200 15 ft (4.5 m) range with 2" PVC flange 35 ft (10.5 m) range with 3" PVC flange PHYSICAL DATA Accuracy:   ±0.3% of span Repeatability:   ±0.125" (±3 mm) typical Supply Voltage:   115±10% VAC, 50/60 Hz, 5 VA Output:   4-20 mA into 600W, isolated Blind Zone:   (UL 100) 12" (cm), (UL 200) 18" (cm) Beam Angle:   Conicle 12° Sensor Pressure Rating:   150 psig maximum Temperature Compensation:   -200 to 180°F (-30 to 82°C) Temperature Range:   Sensor: -20 to 180°F (-30 to 82°C), Electronics: -10 to 160°F (-23 to 71°C) Sensor Material:   CPVC Control Box Enclosure:   Polycarbonate, NEMA 4X Mounting:   (UL 100) 2" PBC 150# flange, (UL 200) 3" PBC 150# flange APPLICATIONS Monitor and control levels of water, wastewater, oils, chemicals, acids, caustics, viscous liquids, and slurries.