ABB-Ultrasonic Level Transmitter LST400
Overview
The ABB LST400 is a high-performance ultrasonic level transmitter engineered for non-contact level monitoring of liquids and solids across a wide range of industrial applications. Using ultrasonic pulses to detect level changes without any moving parts, the LST400 is ABB’s longer-range ultrasonic model, measuring up to 15 meters – positioned above the compact LST300 for tanks, silos, and open channels that exceed the compact model’s measurement span.
Seven Star LLC supplies the ABB LST400 to water treatment, chemical processing, and food production operators across Oman and the wider GCC as an authorized partner for genuine ABB instrumentation. Every unit is sourced through ABB’s official channel, supported by manufacturer documentation and warranty, and backed locally with range and mounting guidance.
Operating Principle
The LST400 emits ultrasonic pulses toward the process surface and measures the time for the echo to return, converting that time-of-flight into a level reading without any part of the sensor contacting the process material. Because it has no moving parts, the LST400 drastically reduces maintenance requirements and enhances long-term reliability compared to contact-based level measurement technologies.
Built-in temperature compensation and advanced echo processing technology improve precision and minimize false readings, even in turbulent or dusty conditions where a weaker echo-processing algorithm might mistake surface disturbance or airborne particulates for a level change. Accuracy is rated at 0.25% of full span with temperature compensation, or 3 mm, whichever is greater, with a beam angle of 7° (at −3 dB) that focuses the acoustic energy tightly on the target surface to reduce false echoes from tank walls or internal structures.
Engineering Design of the ABB LST400
The rugged housing and IP-rated protection make the LST400 ideal for outdoor or corrosive settings, including water treatment plants, chemical processing units, and food production facilities. Installation is simple, with intuitive software for easy calibration and configuration, and the sensor measures ranges from 0.5 to 15 m (S15/C15/F15 sensors) or 1.5 to 30 m (S30 sensor for the largest vessels) with high accuracy. The enclosure is rated IP65/NEMA 4X in glass-loaded polycarbonate, operating from −20°C to 65°C ambient (sensor element rated −40°C to 90°C), and is powered from either 110/240 VAC ±15% or 20–30 VDC depending on the ordering configuration.
The LST400 supports multiple output formats including analog 4–20 mA with integrated HART 7 digital communication, allowing seamless communication with existing control systems – giving engineers integration flexibility regardless of a plant’s existing instrumentation standard. Process connection options include 1-inch NPT threaded or ANSI/ASME and metric flanges from 76 mm to 152 mm, letting the LST400 mount directly onto most existing tank or channel nozzles.
Key Features
- Non-contact ultrasonic level measurement, no moving parts
- Extended measurement range up to 15 meters
- Built-in temperature compensation and advanced echo processing
- Rugged, IP-rated housing for outdoor and corrosive environments
- Intuitive software for calibration and configuration
- Analog (4-20mA) and digital output protocols
- Suited to turbulent or dusty process conditions
- Low maintenance, long-term reliability
- Accuracy of 0.25% full span or 3 mm (whichever is greater), 7° beam angle
- IP65/NEMA 4X enclosure; sensor rated −40°C to 90°C
- 1-in. NPT threaded or ANSI/metric flanged process connection (76–152 mm)
Industrial Applications
The LST400 is suitable for tanks, silos, and open channels across water treatment plants, chemical processing units, and food production facilities – particularly larger vessels or channels where its 15-meter range exceeds what a compact ultrasonic transmitter like the LST300 can cover.
Across Oman’s water treatment and industrial processing sectors, and throughout the wider GCC, Seven Star LLC supplies the LST400 as an authorized ABB partner to facilities in Muscat, Sohar, and Salalah that require dependable, factory-genuine long-range ultrasonic level transmitters with full local support.
Technical Specifications
| Parameter | Specification |
|---|---|
| Model | ABB LST400 |
| Measurement Type | Ultrasonic, non-contact |
| Measurement Range | 0.5–15 m (S15/C15/F15); 1.5–30 m (S30) |
| Accuracy | 0.25% of full span or 3 mm, whichever is greater |
| Beam Angle | 7° (at −3 dB) |
| Media | Liquids and solids |
| Power Supply | 110/240 VAC ±15% or 20–30 VDC |
| Operating Temperature | −20°C to 65°C ambient; sensor to 90°C |
| Process Connection | 1 in. NPT; ANSI/metric flange 76–152 mm |
| Outputs | 4–20 mA with HART 7 |
| Enclosure | IP65/NEMA 4X, glass-loaded polycarbonate |
| Application | Tanks, silos, open channels |
Request a Quote for ABB-Ultrasonic Level Transmitter LST400
Contact Seven Star LLC for a quotation on the ABB LST400 ultrasonic level transmitter, backed by authorized ABB supply, genuine documentation, and local support across Oman and the GCC.
Related Products
ABB is one of the world’s leading technology companies in electrification and automation, recognized for its commitment to innovation, reliability, and energy efficiency. With a history spanning more than a century, ABB delivers high-performance products and systems that help industries operate more intelligently and sustainably.
The company’s expertise covers a wide range of fields including power distribution, process automation, robotics, motion control, and digital solutions for smart manufacturing. ABB’s products are designed to enhance productivity, safety, and operational efficiency while reducing energy consumption and environmental impact.
Seven Star LLC supplies a complete selection of genuine ABB products, including industrial drives, PLCs, contactors, sensors, relays, and automation components, serving clients across oil & gas, energy, marine, and manufacturing sectors.
By combining ABB’s advanced engineering with Seven Star LLC’s trusted sourcing and support, customers gain access to reliable, future-ready industrial solutions built to meet the most demanding standards of modern industries.
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