Brand: JUMO

JUMO NESOS R20 LT Float Level Transmitter

Name: JUMO NESOS R20 LT Float Level Transmitter – Datasheet
Brand: JUMO

Description

Overview

JUMO NESOS R20 LT is a level transmitter that uses a float and reed chain to provide quasi-continuous level measurement of liquids in storage tanks and containers, operating according to the Archimedes’ principle. Delivering a resolution of up to 5.5 mm and a standard 4 to 20 mA output signal, the JUMO NESOS R20 LT is customizable with a wide choice of float materials and forms, and can optionally include an integrated temperature sensor or switch for combined level and temperature monitoring from a single measuring point.

Backed by manufacturer datasheet documentation, Seven Star LLC proudly supplies the JUMO NESOS R20 LT float level transmitter to water and wastewater, chemical, and industrial storage customers across Oman and the wider GCC. Every unit supplied through Seven Star LLC comes with manufacturer documentation and access to local technical support – supporting facility engineers and procurement teams in Muscat, Sohar, and Salalah who specify the JUMO NESOS R20 LT.

Working Principle

The JUMO NESOS R20 LT measures liquid level according to the Archimedes’ principle: a float rides on the surface of the liquid and moves along a guide tube as the level changes, actuating a chain of reed switches positioned at fixed intervals inside the tube. As the float passes each reed switch position, a resistance value is generated that is converted into a standard 4 to 20 mA signal, or alternatively output as a raw potentiometric resistance value for reduced variants without an integrated head transmitter.

Because this measuring principle is fundamentally mechanical rather than relying on electrical properties of the medium, the JUMO NESOS R20 LT is unaffected by foam formation, conductivity (permittivity), pressure, vacuum, steam, or condensation – conditions that commonly disrupt capacitive or other electronic level measurement technologies. Level can be determined independently from container geometry, and the measurement remains stable and accurate regardless of medium temperature, since the reed switch actuation itself carries no temperature-dependent electrical characteristic.

Engineering Design of the JUMO NESOS R20 LT

The JUMO NESOS R20 LT covers a level measuring range from 0 m to 4 m, with process pressure ratings from -1 bar to 37 bar and process temperatures from -52°C to +180°C, giving it an exceptionally broad operating envelope for both cryogenic and elevated-temperature liquid storage applications. Available resolutions include 5.5 mm, 8.8 mm, 11 mm, and 17.6 mm, selected according to the precision requirements of the specific application, and floats are available in stainless steel or titanium, in either cylinder (Ø44) or sphere (Ø52) form, with in-house manufacturing enabling customer-specific float materials and shapes.

The transmitter carries ingress protection up to IP68, supporting fully submerged or heavily washed-down installations, and is approved for explosion-protected areas per ATEX and IECEx (Ex i intrinsically safe or Ex d flameproof enclosure configurations), as well as DNV marine classification, EAC, and railway testing per DIN EN 50155. Because the device has no pressurized housing, it does not fall under the Pressure Equipment Directive 2014/68/EU, a distinction confirmed by a separate TÜV SÜD certificate, simplifying its regulatory classification for procurement purposes.

Key Features

The JUMO NESOS R20 LT combines a proven, media-independent float measuring principle with broad certification coverage that makes it a standard choice for reliable liquid level measurement across demanding industries.

Quasi-continuous level measurement via Archimedes’ principle with resolution as fine as 5.5 mm.
Measurement is unaffected by foam, conductivity, pressure, vacuum, steam, or condensation in the process medium.
A wide process pressure range (-1 bar to 37 bar) and temperature range (-52°C to +180°C) support both cryogenic and hot liquid applications.
Float materials in stainless steel or titanium, in cylinder or sphere form, allow customer-specific application matching.
Ingress protection up to IP68 supports fully submerged or heavily washed-down installations.
ATEX and IECEx approvals (Ex i or Ex d) support installation in classified hazardous areas.
DNV marine classification and railway testing per DIN EN 50155 extend suitability to shipbuilding and rail applications.
An optional integrated temperature sensor or switch combines level and temperature monitoring in a single measuring point.

Industrial Applications

The JUMO NESOS R20 LT is deployed across water and wastewater engineering, chemical processing, oil and fuel storage, and shipbuilding wherever reliable, media-independent level measurement is required in storage tanks and containers. Typical duties include fuel and chemical storage tank level monitoring, wastewater treatment level control, and marine tank level measurement in vessels requiring DNV-classified equipment.

Working closely with plant engineers in the region, Seven Star LLC distributes the JUMO NESOS R20 LT to water utilities, chemical storage terminals, and industrial facilities throughout Oman and the GCC. The transmitter is a strong fit for tank farms and storage terminals across the Sohar and Salalah industrial zones, as well as for water treatment and marine applications across Muscat that require dependable, hazardous-area-approved level measurement.

Technical Specifications

The table below summarizes the core specifications of the JUMO NESOS R20 LT level transmitter as supplied by Seven Star LLC.

Parameter	Specification
Model	JUMO NESOS R20 LT (408320)
Measuring Principle	Float and reed chain (Archimedes’ principle)
Level Range	0 to 4 m
Resolution	5.5 mm, 8.8 mm, 11 mm, or 17.6 mm
Process Pressure	-1 to 37 bar
Process Temperature	-52°C to +180°C
Float Material/Shape	Stainless steel or titanium; cylinder (Ø44) or sphere (Ø52)
Output Signal	4 to 20 mA; potentiometric resistance (reduced variant)
Ingress Protection	Up to IP68
Approvals	ATEX, IECEx (Ex i/Ex d), DNV, EAC, DIN EN 50155 (rail)
Typical Applications	Water/wastewater, chemical, oil/fuel storage, shipbuilding

Request a Quote for JUMO NESOS R20 LT Float Level Transmitter

Seven Star LLC supports the full procurement cycle for the JUMO NESOS R20 LT float level transmitter, from formal RFQ submission to confirmation of availability and lead time, technical datasheet delivery, and direct consultation with our instrumentation division on float material, resolution, and hazardous area certification for your application. With fast quotation turnaround and technical support, we supply every JUMO NESOS R20 LT transmitter with manufacturer documentation and local technical support. Contact Seven Star LLC today to request a quotation or discuss your level measurement requirements.

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About brand

JUMO is the German maker of temperature sensors, process controllers, pressure transmitters and liquid analysis instruments. Moritz Kurt Juchheim founded it in Fulda in 1948 as M. K. Juchheim KG, making glass thermometers with six employees. The name JUMO comes from the founder's name. It is still a family company headquartered in Fulda, and the parent company has been called JUMO GmbH & Co. KG since 2003.

Seven Star LLC is an independent supplier in Muscat. We list JUMO RTD and thermocouple probes, thermowells, transmitters, controllers, recorders and water analysis instruments, and supply them to process plants, OEMs, HVAC contractors and water utilities in Oman and the GCC by type number.

JUMO company profile

Established	1948, Fulda, Germany, by Moritz Kurt Juchheim
First products	Glass and contact thermometers; platinum glass sensors from 1966
Ownership	Family-owned; renamed JUMO GmbH & Co. KG in 2003
Product families	RTD and thermocouple probes, thermowells, temperature and pressure transmitters, controllers and thermostats, safety temperature limiters, paperless recorders, liquid analysis and flow and level instruments

Milestones

1948: Moritz Kurt Juchheim founds M. K. Juchheim KG in Fulda, making glass thermometers with six employees.
1966: Platinum glass temperature sensors are added.
2003: The parent company is renamed JUMO GmbH & Co. KG.

JUMO products we list

Family	Models	Typical use
RTD and thermocouple probes	902020, 902030, 902050, 902120, 902006 2xPt100, PROCESStemp, mineral-insulated RTD, 901020 thermocouple, 901210, 902810 hygienic, 902550 surface, 902520 HVAC, MarineTemp	Temperature measurement in pipes, vessels, machines, HVAC and food plants
Thermowells and inserts	909710 thermowells, 909740 measuring inserts	Protecting sensors and replacing them without opening the process
Temperature transmitters	dTRANS T01, T03, T04, T05, T06 SIL, T07 HART, T09, T1000 IO-Link, DELOS T switch	Converting sensor signals to 4-20 mA, HART or IO-Link
Pressure and level	dTRANS p20, p30, p31 hygienic, p33 Ex, p02 DELTA, MIDAS S05, MIDAS DP10, DELOS S02, MAERA S25, NESOS R20	Pressure in process, hydraulic and OEM systems; tank and well level
Controllers, limiters and recorders	DICON touch, IMAGO 500, dTRON 316, iTRON, cTRON, diraTRON 104, eTRON T, safetyM STB/STW, safetyM TB/TW, LOGOSCREEN 601, mTRON T	Furnace, oven and process control, over-temperature protection and recording
Liquid analysis and flow	AQUIS touch S, AQUIS touch P, AQUIS 500 pH, AQUIS 500 CR, dTRANS pH 02, pH electrode, digiLine DO, ecoLine NTU, flowTRANS MAG H20, flowTRANS US W01	pH, conductivity, oxygen and turbidity in water treatment; liquid flow

Choosing a temperature sensor starts with the range and accuracy. A Pt100 RTD is accurate and stable from about -200 to 600 °C and is the usual choice in process plants. A thermocouple (type K or J, for example) covers much higher temperatures and responds faster but is less accurate. The wiring also matters: a 3-wire or 4-wire Pt100 connection cancels the resistance of the cable, while a 2-wire connection adds an error that grows with cable length. That is why a head-mounted transmitter is often fitted close to the sensor.

Where JUMO products are used

In Oman and the GCC, JUMO sensors and controllers are used in oil and gas and chemical plants, food and beverage production, plastics and metal heat treatment, HVAC and district cooling, water and wastewater treatment, swimming pools and marine applications.

Ordering JUMO products: what we need

Send the JUMO type number and the full order code from the label (for example 902020/10-...). For probes, add the sensor type (Pt100, Pt1000, type K or J), the number of wires, the insertion length and diameter, and the process connection. For controllers, add the input, outputs and supply voltage.

Facts checked against JUMO's company history, October 2026.

Browse JUMO products by category: Temperature Instrumentation, Pressure Instrumentation, Liquid Analysis Sensors, Controllers & Data Acquisition, Level Transmitter.

FAQ

Questions about the JUMO NESOS R20 LT Float Level Transmitter

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

01Is the JUMO NESOS R20 LT affected by foam or steam in the tank?

No. Because the float measuring principle is fundamentally mechanical rather than relying on electrical properties of the medium, the NESOS R20 LT is unaffected by foam formation, conductivity, pressure, vacuum, steam, or condensation.

02What resolution options are available for the NESOS R20 LT?

The transmitter is available with resolutions of 5.5 mm, 8.8 mm, 11 mm, or 17.6 mm, selected according to the precision requirements of the specific application.

03Can the JUMO NESOS R20 LT be used in explosion-hazardous areas?

Yes. The transmitter is approved for hazardous areas per ATEX and IECEx, available in intrinsically safe (Ex i) or flameproof enclosure (Ex d) configurations.

04What float materials and shapes are available?

Floats are available in stainless steel or titanium, in either cylinder (Ø44) or sphere (Ø52) form, with in-house manufacturing allowing customer-specific float materials and shapes for special applications.

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

Yes, Seven Star LLC is an experienced supplier of JUMO in Oman and the GCC. We supply JUMO instrumentation on request with local technical support.