The Yokogawa UT351-00 is a digital, two-wire ultrasonic level transmitter designed for non-contact, continuous level measurement of liquids and solids in storage tanks, process vessels, and open channels.
Key Features and Specifications
Measurement Principle: Non-contact ultrasonic (time-of-flight).
Output Signal:
Analog Output: One 4-20 mA DC output (two-wire, loop-powered), linearly proportional to level or distance.
Digital Communication: HART® protocol is standard for configuration and diagnostics.
Power Supply: Two-wire, loop-powered: 12.5 to 30 V DC, powered via the 4-20 mA loop.
Display: Integral LCD display (standard) showing level, distance, and diagnostic information.
Measuring Range: Varies by specific model and transducer size, but typically up to 15 meters (approx. 49 feet) for liquids.
Accuracy: Typically ±0.25% of full scale or better, depending on conditions.
Process Connection: Typically a 2-inch NPT thread or a flange mount for installation.
Enclosure Rating: Typically IP67 or NEMA 4X, providing excellent protection against dust and water ingress for outdoor and harsh industrial environments.
Process Temperature: -40 to 80 °C (-40 to 176 °F) [Temperature at the transducer].
Key Features:
Non-contact measurement: Ideal for corrosive, abrasive, or sticky materials.
Built-in temperature compensation for accurate readings in varying ambient conditions.
Easy calibration and setup via the keypad or HART communicator.
False echo suppression software to ignore fixed obstructions inside the tank.