Brand: ABB

ABB Thermal Dispersion Level Switch TX

Name: ABB TX Level Switch - Thermal Dispersion – Datasheet & Quote
Brand: ABB

Description

Overview

The ABB TX level switch is a thermal dispersion device engineered for accurate level detection of liquids and gases in industrial applications. It utilizes thermal dispersion technology, which measures the temperature difference between two sensors to detect the presence or absence of a medium – a fundamentally different physical principle from the capacitance, buoyancy, or magnetic level switches elsewhere in ABB’s level portfolio.

Seven Star LLC supplies the ABB TX to chemical processing, food and beverage, pharmaceutical, and oil and gas operators across Oman and the wider GCC as part of its range of genuine ABB instrumentation. Every unit is supplied with manufacturer documentation and backed locally with set-point configuration guidance.

Operating Principle

The TX contains two temperature sensors: one continuously heated slightly above process temperature, the other tracking ambient process temperature as a reference. When the medium covers the heated sensor, the improved heat dissipation changes the measured temperature differential, which the switch interprets as the presence of the medium; when the medium recedes, the differential returns to baseline. This principle works equally well for liquids and gases without requiring the medium to have specific electrical or dielectric properties.

Because the switch has no moving parts, it minimizes wear and maintenance needs, and it provides consistent switching output regardless of foam, turbulence, or coating on the sensor surface – conditions that would confound a capacitance or float-based switch relying on a different physical measurement principle.

Engineering Design of the ABB TX

The compact design allows easy installation in tight spaces, while still delivering high-performance level detection even in harsh environments with high temperature, pressure, or vibration. The TX operates efficiently in both horizontal and vertical mounting positions and is ideal for tanks, vessels, and pipelines with configurable set points that adapt seamlessly to various process requirements.

Smart diagnostics and a fast response time ensure accurate measurements in real-time, and the rugged stainless steel construction with IP-rated enclosure makes the TX a long-lasting solution for reliable point-level detection across a broad range of installation environments.

Key Features

Thermal dispersion point-level detection for liquids and gases
No moving parts, minimal wear and maintenance
Unaffected by foam, turbulence, or sensor coating
Works in both horizontal and vertical mounting positions
Configurable set points for various process requirements
Smart diagnostics and fast response time
Rugged stainless steel construction, IP-rated enclosure
Meets international safety and quality standards
Standard temperature range −46°C to 177°C, extended option to −196°C/260°C
Pressure rating up to 275 bar standard, 689 bar high-pressure option
DPDT relay output rated 8 A at 250 VAC; Class I/II/III Division 1 hazardous-area certified

Industrial Applications

The TX supports a wide range of industries including chemical processing, food and beverage, pharmaceuticals, and oil and gas, monitoring interface levels, preventing overflows, or controlling pump operations in critical or hazardous environments where a reliable, coating-tolerant switch principle is essential.

Across Oman’s chemical processing and oil and gas sectors, and throughout the wider GCC, Seven Star LLC supplies the TX to facilities in Muscat, Sohar, and Salalah that require dependable, factory-genuine thermal dispersion level switches with full local support.

Technical Specifications

Parameter	Specification
Model	ABB TX
Measurement Type	Thermal dispersion point-level switch
Detected Media	Liquids and gases
Temperature Range	−46°C to 177°C standard; −196°C to 260°C extended option
Pressure Rating	Up to 275 bar (4,000 psig); 689 bar (10,000 psig) high-pressure option
Response Time	~3 s (dry-to-wet); ~8 s (wet-to-dry)
Wetted Material	316L stainless steel; Hastelloy B-3/C-276, Alloy 20, Monel optional
Process Connection	¾–2 in. MNPT threaded; 1–6 in. flanged, ASME 150#–1500#
Electrical Output	DPDT relay, 8 A @ 250 VAC
Power Input	90–132 VAC, 200–240 VAC, or 24 VDC/VAC
Hazardous Area	Class I Div 1 Groups A–D; Class II/III Div 1 Groups E–G
Mounting	Horizontal or vertical
Application	Chemical, food & beverage, pharmaceuticals, oil & gas

Installation Guidelines for the TX

Mount the probe so the sensing tip is fully immersed at the switching level you want. For side mounting on a vessel, a slight downward angle helps liquid drain from the tip and avoids false readings.
Keep the tip away from inlet streams, agitator blades and areas where foam or splashing is common, as these can wet or cool the sensor and give false switching.
Leave enough clearance to remove the probe for inspection, and use a process connection and gasket that suit the vessel rating and the medium.
Route the cable through suitable glands and keep it separate from power wiring, following the area classification requirements at your site.

Commissioning and Set-Up

Because thermal dispersion depends on the heat transfer properties of the medium, set up the switch under real process conditions whenever possible. With the tip first dry and then covered, confirm that the switch changes state reliably and adjust the sensitivity or time delay as described in the operating instructions. Check the relay or output action against the alarm or interlock logic in the control system, including the failsafe state on power loss.

Maintenance and Troubleshooting

Because the switch has no moving parts, maintenance mostly means keeping the sensor tip clean. In viscous, sticky or crystallising media, coating can slow heat transfer and delay switching, so inspect the tip at regular intervals and clean it without scratching the surface. If the switch fails to change state, check for coating, supply voltage and wiring faults first. If it switches too slowly, review the time delay and the process temperature changes, which can affect the reference sensor.

Applications in Oman and the GCC

The ABB TX level switch suits overfill and low-level protection on storage tanks, chemical dosing vessels, separators and sumps. It also works in gas and liquid interface duties where conductive or capacitive methods struggle. It is used in chemical plants, food and beverage production and oil and gas facilities across Oman and the GCC.

Working with Seven Star LLC

Seven Star LLC supplies ABB level instrumentation and related spares to customers in Oman and the GCC. Share your process conditions and process connection, and we will help confirm the right configuration before ordering.

Request a Quote for ABB Thermal Dispersion Level Switch TX

Contact Seven Star LLC for a quotation on the ABB TX thermal dispersion level switch, backed by genuine ABB documentation and local support across Oman and the GCC.

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About brand

ABB is the Swiss-Swedish engineering group for electrification and automation: low voltage drives, motors, circuit breakers and motor control, process instruments and analysers, control systems and robots. It was formed on 5 January 1988 by the merger of two older companies. ASEA was founded in Västerås, Sweden, in 1883 by Ludvig Fredholm to make electric lighting and generators. BBC Brown Boveri was founded in Baden near Zurich in 1891 by Charles E. L. Brown and Walter Boveri. ABB Ltd is incorporated in Switzerland, headquartered in Zurich and listed on the SIX Swiss Exchange and Nasdaq Stockholm.

ABB company profile

Formed	5 January 1988, by the merger of ASEA (Sweden) and BBC Brown Boveri (Switzerland), each holding 50%
ASEA	Founded 1883 in Västerås, Sweden, by Ludvig Fredholm; first products electric lighting and generators
Brown, Boveri & Cie	Founded 1891 in Baden, Switzerland, by Charles E. L. Brown and Walter Boveri
Headquarters	Zurich, Switzerland; ABB Ltd became the group holding company in 1999
Ownership	Public company listed on SIX Swiss Exchange and Nasdaq Stockholm
Brands in the group	Baldor (US motors, acquired 2011), B&R (machine automation, acquired 2017), K-TEK level instruments, Endura and Navigator analysers, SACE breakers
Product families	Low and medium voltage drives (ACS series), motors, SACE Tmax and Emax breakers, contactors and soft starters, flow, pressure, temperature and level instruments, liquid and gas analysers, Contrac actuators, AC500 PLCs, Ability System 800xA and S800 I/O, protection relays, robots

Milestones

1883: ASEA is founded in Västerås, Sweden.
1891: Brown, Boveri & Cie is founded in Baden, Switzerland.
1987–1988: The merger is announced on 10 August 1987; ABB Asea Brown Boveri starts operating on 5 January 1988.
1999: ABB Ltd, incorporated in Switzerland, becomes the single holding company of the group.
2011 and 2017: Baldor Electric and B&R join ABB.
2020: ABB sells its power grids business to Hitachi, focusing on electrification, motion, process and machine automation.

Choosing an ABB drive

ABB's ACS drive codes are easy to read once you know the pattern. In ACS580-01-046A-4, "ACS580" is the drive family, "01" means a wall-mounted single drive, "046A" is the rated output current (about 46 A) and "-4" means a 380–480 V supply. The family is chosen by application: ACS355 for compact machinery, ACS310 for simple pumps and fans, ACS580 as the general-purpose drive, ACQ580 for water and wastewater with pump functions such as pipe fill and dry-run protection, and ACS880 for heavy industrial duty with direct torque control. Size the drive on the motor's full-load current, not only its kW rating, and allow derating for the high ambient temperatures common in Gulf electrical rooms.

Where ABB products are used

In Oman and the GCC, ABB drives and motors run pumps, fans and compressors in water and wastewater plants, district cooling, oil and gas and industry. ABB flowmeters, level instruments and analysers are used in water utilities, power and desalination plants and refineries, and SACE breakers protect switchboards in buildings and plants.

ABB products we list

Family	Examples
AC drives	ACS580, ACS580-01-046A-4, ACQ580, ACS355, ACS310, ACS880-01, FEN-31 encoder module
Breakers, motor control and protection	SACE Tmax XT, XT3N 250, SACE Emax 2, AF09 contactor, PSR soft starter, REM615 relay
Flow measurement	ProcessMaster FEP300, AquaMaster4, CoriolisMaster FCB430, VortexMaster FSV430, SwirlMaster FSS430, OriMaster FPD500
Pressure, temperature and level	266DRH, 267CS multivariable, TTH300, K-TEK AT100, LMT200, MT5000 GWR, KM26 gauge
Analysers	Endura AZ20, AK100 hydrogen purity, Navigator AW641 silica, AW402 chlorine, AWT210
Control systems and actuators	AC500, AC500-S, S800 AI810, AC 800F SA 811F, Contrac RSD50, Contrac RHD4000

Ordering ABB products: what we need

Send the full type code from the nameplate (for example ACS580-01-046A-4 or 266DSH...) and, for spare parts, the ABB ID number (such as 3BSE008508R1 or 1SBL176001R3010). For drives, add the motor power and current and any option codes (+...). For instruments, send the complete order code, which sets range, materials and approvals. Baldor motors are listed on their own brand page.

Facts checked against ABB company filings and published histories of ASEA and Brown, Boveri & Cie, October 2026.

FAQ

Questions about the ABB Thermal Dispersion Level Switch TX

Answers from our engineering team on installation, compatibility and integration.

01How does the ABB TX detect the presence of a medium?

It uses two temperature sensors: one heated above process temperature and one tracking ambient temperature. When medium covers the heated sensor, the change in heat dissipation is detected as the presence of the medium.

02Is the ABB TX affected by foam or sensor coating?

No. It provides consistent switching output regardless of foam, turbulence, or coating on the sensor surface, unlike some capacitance or float-based switches.

03Can the ABB TX detect both liquids and gases?

Yes. Its thermal dispersion principle works for both liquids and gases without requiring the medium to have specific electrical or dielectric properties.

04What mounting orientations does the TX support?

The TX operates efficiently in both horizontal and vertical mounting positions, suitable for tanks, vessels, and pipelines.

05Is Seven Star LLC an experienced supply partner for ABB products?

Yes. Seven Star LLC supplies ABB products to customers in Oman and the GCC and can provide the manufacturer documentation and technical support on request.