Ultrasonic Level Meter

Product Overview

An ultrasonic level meter is a non-contact, continuous level measurement device designed for liquids, slurries, and bulk solids. By emitting high-frequency acoustic pulses from a piezoelectric transducer and measuring the return time of the echo reflected off the media surface, the unit calculates distance without physical immersion.

Eliminating moving parts and direct material contact prevents mechanical wear, chemical fouling, and maintenance bottlenecks typical in corrosive or viscous environments. Available in compact integrated enclosures or split-mount configurations with remote sensor heads, these units integrate into existing control architectures via standard industrial protocols.

Small Range Ultrasonic Level Sensor
The sensor probe emits ultrasonic pulses, which reflect off the liquid surface. By measuring the round-trip time of the sound waves, the sensor calculates the distance to the liquid surface,...
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Remote Type Ultrasonic Level Meter
The series is an enhanced remote ultrasonic level meter for continuous non-contact level measurement in liquids and solids. It consists of probe and host, both of which are plastic leak-proof...
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Metal Housing Ultrasonic Level Meter
The UTG21‑H(E) is an integrated explosion‑proof ultrasonic level transmitter. It adopts the ultrasonic time‑of‑flight principle for **non‑contact liquid level measurement**, and is applicable to...
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UTG21-K Ultrasonic Level Meter
UTG21-K Ultrasonic Level Transmitter is a professional industrial level measuring instrument designed for continuous, non-contact detection of liquid, paste and granule material level.
...
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UTG21-P Ultrasonic Level Meter
The UTG21-P ultrasonic level meter includes several proprietary technologies, is safe and clean, with high precision and long service life, stable and reliable, and convenient to install and...
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UTG21-BE Explosion-proof Ultrasonic Level Meter
UTG21-BE Ultrasonic Level Transmitter is a professional industrial level measuring instrument designed for continuous, non-contact detection of liquid, paste and granule material level.
...
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UTG21-HE Explosion-proof Ultrasonic Level Meter
UTG21-HE Ultrasonic Level Meter integrates multiple proprietary technologies, featuring safe and clean operation, high measurement precision, and a long service life.

● High...
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UTG21-PR Remote Type Ultrasonic Level Meter
The UTG21-PR Ultrasonic Level Transmitter is a professional industrial level measurement device designed for continuous and non-contact detection of liquid, paste and granule material levels....
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UTG21-PS Remote Type Ultrasonic Level Meter
UTG21-PS ultrasonic level meter is a high-performance non-contact liquid level measuring instrument..

● Easy to install and maintain
● Lightning and short-circuit protection...
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UTG21-R Ultrasonic Level Meter
The UTG21-R Ultrasonic Level Transmitter is a professional industrial non-contact level measurement instrument, designed for continuous and accurate level detection of liquid, paste and granule...
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UTG21-W Ultrasonic Level Sensor
The UTG21-W Ultrasonic Distance Transducer is a professional industrial-grade ranging sensor engineered for accurate non-contact distance measurement.

● Small blind zone &...
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UTG21-S Ultrasonic Level Sensor
UTG21-S is high-performance industrial-grade ultrasonic sensing transducers designed for non-contact distance and liquid/solid level measurement, engineered to deliver reliable and accurate data...
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Measurement & Testing Principle

The instrument operates on the time-of-flight acoustic pulse-echo principle:

Pulse Emission: The internal microprocessor triggers the piezoelectric ceramic transducer to emit a directional acoustic wave ranging from 20 kHz to 70 kHz.

Propagation & Reflection: The wave travels through the vapor space, strikes the target medium surface, and reflects an echo back to the transducer.

Echo Reception: The transducer converts the mechanical acoustic wave back into an electrical signal.

Transit Time Calculation: The embedded digital signal processor measures transit time (t). Distance (D) is computed via the formula:D = (c * t) / 2(where c represents the velocity of sound in the gas medium).

Temperature Compensation: Because sound velocity varies with gas temperature, an integrated temperature sensor measures internal ambient temperature in real time, automatically correcting the sound velocit

Product Types & Configurations

Series	Configuration	Housing Material	Max Range (Liquid)	Primary Application
Compact Series	Integrated single-piece	PVDF / Cast Aluminum	Up to 10 meters	Water treatment basins, standard chemical totes
Split Series	Remote sensor + wall-mount display	PP / Stainless Steel Flange	Up to 30 meters	Deep open channels, hazardous vapor zones
Explosion-Proof Series	Flameproof enclosure	Epoxy-coated Aluminum	Up to 15 meters	Petrochemical fuel storage, combustible liquids

Key Features

Advanced Echo Processing: Proprietary filtering algorithms differentiate true surface echoes from structural false echoes caused by internal tank fixtures or agitator blades.

Corrosion-Resistant Wetted Parts: Transducer faces molded in solid polyvinylidene fluoride or PTFE resist aggressive acid and alkali vapors.

Narrow Beam Angle: Acoustic emission angles restricted to less than or equal to 6 degrees minimize false reflections in narrow, tall silos or constricted risers.

Loss-of-Echo Diagnostics: Programmable fail-safe modes trigger immediately upon signal attenuation from heavy foam or excessive dust.

Dual-Compartment Enclosure: Die-cast aluminum housing isolates terminal wiring from the main circuit board, preventing moisture ingress during field cabling.

Technical Specifications

Parameter	Specification Details
Measuring Range	0.4m to 30m (dependent on model and surface condition)
Accuracy	Plus or minus 0.25% Full Scale
Resolution	1 mm or 0.1%
Blind Zone (Dead Band)	0.25m to 0.5m
Beam Angle	Less than 6 degrees (at -3dB total angle)
Operating Frequency	20 kHz to 70 kHz
Analog Output	4 to 20 mA loop-powered, max load 750 ohms
Digital Communication	HART Protocol, RS485 / Modbus RTU
Display	4-digit LCD with optical keypad programming
Power Supply	24 VDC standard; 85 to 265 VAC optional
Ingress Protection	IP67 for integrated units; IP68 for remote sensor heads
Process Connection	G 2" thread, 2" NPT, or ANSI / DIN Flanges (DN50 - DN150)
Ambient Temperature	-40 degrees Celsius to +70 degrees Celsius
Process Pressure	-0.2 bar to +1.0 bar

Applications

01.

Municipal Wastewater Treatment

Sludge holding tanks, grit chambers, influent wet wells, and open-channel flumes using integrated linearization curves.

02.

Chemical & Petrochemical Storage

Hydrochloric acid, sodium hydroxide, and wastewater neutralization basins requiring non-contact wetted paths.

03.

Food & Beverage Processing

Utility water tanks, syrup storage, and grain silos utilizing dust-compensating gain adjustments.

04.

Mining & Aggregate

Slurry thickener basins and dry mineral powder storage silos.

Installation & Operating Considerations

Mounting Location

Install the transducer perpendicular (90 degrees) to the liquid surface, positioned away from direct inflow streams to avoid turbulence and splashing.

Clearance Requirements

Ensure the lowest liquid level remains below the sensor dead band to prevent unmeasured saturation zones and erratic output.

Nozzle Extension

If mounting via a nozzle, the inner diameter must match frequency requirements, and the bottom edge of the transducer face must extend past the inner vessel ceiling.

Solar Shielding

Outdoor direct-sunlight installations require sunshade accessories to prevent internal electronics from exceeding the +70 degrees Celsius thermal limit.

Manufacturing & Quality Control

UTG21-BE Explosion-proof Ultrasonic Level Meter

Transducer Assembly

Piezoelectric ceramic crystals undergo automated polarization bonding and vacuum encapsulation to eliminate internal air voids.

UTG21-PR Remote Type Ultrasonic Level Meter

Acoustic Calibration Test Bench

Units undergo a 12-hour automated thermal chamber burn-in cycle ranging from -30 degrees Celsius to +60 degrees Celsius to verify zero-point drift and phase stability.

UTG21-PS Remote Type Ultrasonic Level Meter

Pressure & Sealing Verification

Sensor assemblies are pressure-tested in pneumatic chambers at 1.5 times rated working pressure to guarantee ingress integrity before final electronic board assembly.

UTG21-HE Explosion-proof Ultrasonic Level Meter

Traceability

Each meter features a laser-engraved serial number tied to an individual calibration certificate documenting exact distance-error curves across 5 calibration points.

Customization & OEM

Private Labeling

Custom laser-engraved nameplates bearing client branding, model nomenclature, and proprietary serial numbering sequences.

Software Firmware Modification

Tailored Modbus register maps, custom tank geometry calculation tables, and multi-language menu structures.

Specialized Materials

Alternative wetted materials and custom thread or flange drillings to match legacy plant retrofit footprints.

Selection Guide

Determine Medium State

Select standard PVDF transducer tips for clean liquids, or higher-frequency narrow-beam models for heavy dust or fine granular solids.

Calculate Maximum Range

Multiply maximum vessel depth by 1.3 to account for dynamic surface turbulence and foam absorption margins.

Select Power & Comms

Specify 2-wire 4 to 20mA HART loops for standard control room integration or RS485 Modbus for multi-drop PLC network topologies.

Verify Hazardous Area Classifications

Choose explosion-proof housing variants if installation occurs within hazardous atmospheres.

Frequently Asked Questions

Q: How does heavy surface foam affect ultrasonic level meter accuracy?

A: Dense or thick foam acts as an acoustic absorber, scattering or dampening the return echo and causing signal loss. For applications with persistent foam blankets, radar level transmitters or guided wave radar instruments are recommended alternatives. For light, transient foam, increasing transmitter gain settings or utilizing software echo-filtering can stabilize readings.

Q: What is the dead band (blind zone), and why must it be factored into tank design?

A: The dead band is the minimum distance directly beneath the transducer face where the instrument cannot process reflections due to the ring-down time of the piezoelectric crystal after pulse emission. If the liquid surface enters this zone, the meter outputs an error state. Mounting the meter higher or using an extension nozzle ensures the high liquid level remains outside this distance.

Q: Can these meters be used in pressurized or vacuum storage tanks?

A: Ultrasonic level meters are designed for atmospheric or near-atmospheric conditions ranging from -0.2 bar to +1.0 bar. They are not suitable for high-pressure industrial reactors or deep vacuum systems, as changes in gas density drastically alter the speed of sound and invalidate the time-of-flight calculation.

Q: What is the maximum cable distance between the remote sensor head and the display unit?

A: For split-mount configurations, the shielded coaxial sensor cable can extend up to 30 meters without signal degradation or external electromagnetic interference distortion, provided the cable is routed away from high-voltage motor power lines.

Q: How does ambient temperature fluctuation impact measurement performance?

A: Sound velocity in air changes by roughly 0.6 meters per second per 1 degree Celsius temperature shift. Without correction, a 20 degrees Celsius swing introduces a measurable distance error. Units utilize an integrated NTC sensor to update sound velocity calculations dynamically every second, restricting thermal drift to within plus or minus 0.1% FS.

Q: What documentation and compliance certificates are supplied with commercial orders?

A: Every shipment includes an individual factory calibration report, material certification such as 3.1 certificates for metallic wetted parts upon request, standard conformity declarations, wiring diagrams, and an English operation manual formatted for instrument technicians.

Dalian Yheng Technology Co., Ltd. is one of the leading ultrasonic level meter manufacturers and suppliers in China, also supports customized service. We warmly welcome you to buy high quality ultrasonic level meter in stock here from our factory. Contact us for more details.

UTG21 BE Explosion proof Ultrasonic Level Meter, UTG21 HE Explosion proof Ultrasonic Level Meter, High Precision Ultrasonic Level Transmitter