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Brand: JUMO
JUMO NESOS R40 LSH Horizontal Float Level Switch, Type 408340
Description
A side-mounted float switch for MIN and MAX alarms on oil and chemical tanks
The JUMO NESOS R40 LSH (type 408340) is a horizontal float switch that is fitted on the side of a tank or container. The float is guided by a joint and swings with the liquid level, and its magnet closes a reed contact inside the guide tube. Because the float can swing up or down, one product serves a minimum (MIN) or a maximum (MAX) level alarm, which reduces storage costs. On threaded versions a cutting ring fitting aligns the float. The datasheet names oil sumps, storage tanks, water and wastewater treatment, apparatus engineering, oil and gas, and the chemical and petrochemical industries as its applications. Guide tube lengths up to 1 m are configurable for insulated vessels or flange fittings, and Ex i, Ex d, DNV GL and WHG approvals are offered.
Technical specifications
| Parameter | Specification |
|---|---|
| Type | 408340 NESOS R40 LSH horizontal magnetic float switch with reed contact |
| Mounting | Side (horizontal) on the tank; mounting position ±30°; guide tube up to 1 m |
| Contact functions | 10 SPST-NO and 12 SPDT-CO; up to two outputs |
| Switching ratings | AC/DC 230 V, 1 A; 100 VA or 100 W for SPST-NO, 60 VA or 60 W for SPDT-CO |
| Temperature element (optional) | Pt100 or Pt1000, -40 to +150 °C, DIN class B; or a temperature switch with N/°C contact 2.5 A at AC 230 V, tolerance ±5 K, hysteresis 30 K ±15 K |
| Process temperature | -40 to +150 °C standard; -52 to +240 °C on request |
| Pressure range | Cylindrical float 042 (42 mm): -1 to +15 bar; spherical float 052 (52 mm): -1 to +47 bar |
| Float density | Minimum medium density 390 kg/m3 for float 042 and 420 kg/m3 for float 052 |
| Wetted materials | AISI 316 series for float, guide tube and process connection |
| Process connections | Threads G 1 1/2, G 2, 1 1/2 NPT, 2 NPT; flanges 2 in. and 2.5 in. ASME 150 or 300 lbs RF, DN 50 to DN 100 PN 40 EN 1092-1 form B1; square flange |
| Electrical connection | Cable (PVC, silicone, PUR), M12 cable or round plug, DIN EN 175301-803 socket, Ex d head, stainless steel head or cube housings |
| Terminal housings | Painted aluminium, AISI 321 stainless steel, or 316 stainless steel Ex d head |
| Protection | IP68 cable, Ex d head and stainless head; IP66 M12 plug, cube housings and stainless Ex d head; IP65 cable socket |
| Ambient temperature (connection) | PVC cable -5 to +80 °C; PUR -40 to +90 °C; silicone -50 to +180 °C; Ex d head -40 to +100 °C |
| Approvals | ATEX/IECEx Ex i and Ex d, DNV GL TAA00001VR, WHG Z-65.11-608, EAC and EAC-Ex |
| Weight | About 3840 g with 100 mm guide tube, DN 50 flange and Ex d connection housing |
| Vibration | 0.7 g at 13.2 to 100 Hz, IEC 60068-2-6 |
Float choice and approvals
Two floats are offered. The 42 mm cylinder with 390 kg/m3 minimum density copes with light hydrocarbons at up to 15 bar. The 52 mm sphere withstands up to 47 bar with 420 kg/m3 minimum density. An immersion depth table in the datasheet lists how deep each float sits for medium densities from 500 to 1400 kg/m3, for example 22.5 mm for float 052 at 1000 kg/m3. Intrinsically safe types 408340/263, /362 and /662 use certificate SEV 18 ATEX 0134 X, and flameproof types /264, /462 and /962 use SEV 18 ATEX 0133 X. No isolating switch amplifier is needed on Ex d versions. Check the type examination certificate for special conditions of use.
Installation and application notes
Specify the optional temperature element when the same tank needs a level and a temperature point: a Pt100 or Pt1000 element covers -40 to +150 °C to DIN class B, while the alternative temperature switch has an N/°C contact rated 2.5 A at AC 230 V with a tolerance of ±5 K. Cable outlets are offered in PVC, silicone or PUR, and the datasheet gives a separate ambient limit for each, so pick the cable by the site temperature as well as by the medium.
The minimum guide tube length is 85 mm for a flange version and 110 mm for a threaded version. When an insulated vessel or long extension is used, the allowed ambient temperature at the terminal housing falls as the process temperature rises, so refer to the diagrams by housing type and extension tube length. A NAMUR circuit can monitor line break or short circuit, but only up to DC 15 V. Protection-class 3 products are limited to AC 33 V or DC 70 V. In petrochemical and oil and gas service the switch fits lube oil reservoirs, knock-out drums, condensate pots and day tanks, where a hot ambient and sun-heated vessel walls call for a silicone cable or stainless terminal head.
Using the NESOS R40 LSH in Oman and the GCC
Side-mounted float switches are used in the region on oil sumps, hydraulic and lube oil tanks, chemical storage tanks, water tanks and wastewater sumps, wherever a simple high or low alarm is needed and top mounting is not possible. Because the same switch can be set up for a minimum or a maximum alarm, maintenance teams can keep fewer spare parts.
The float must be able to swing freely, so leave enough room inside the tank and keep it away from inlet flows and agitators. Check that float and seal materials suit the liquid. Reed contacts are best connected to a PLC input or through a contact protection relay. Test the switch at each maintenance interval, especially in tanks with sludge or deposits.
Information to send with an enquiry
- Liquid, temperature and pressure
- Process connection and tank wall thickness
- MIN or MAX function and contact type
- Approvals and cable length
Related JUMO products: JUMO NESOS R04 LS Bent Float Level Switch, JUMO NESOS R20 LT Float Level Transmitter, JUMO ZELOS C01 LS Capacitive Level Switch, JUMO MAERA F27 Ceramic Level Probe with PTFE or Steel Case, JUMO MAERA S25 Hydrostatic Level Probe and JUMO MAERA S29 SW Titanium Level Probe.
Documents and quotation
The hosted document is JUMO data sheet 408340 (16 pages, English). It includes dimensions, flange tables, wiring and order details. Confirm float, contact function, guide tube length, connection and approvals before ordering. Seven Star LLC is an independent supplier in Muscat; send the medium, density, pressure, temperature and switching points for a quotation.
Datasheets & Documents
- Datasheet JUMO 408340 data sheet 408340 (EN) Download
Reviews (0)
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 R40 LSH Horizontal Float Level Switch,
Answers from our engineering team on installation, compatibility and integration.
01Can the R40 LSH serve for MIN and MAX alarms?
Yes, the horizontal float swings up or down so the same device can be used for a minimum or a maximum level point.
02What pressure can it handle?
The 42 mm cylinder float is rated -1 to +15 bar and the 52 mm sphere -1 to +47 bar.
03Which temperatures are covered?
Standard process temperature is -40 to +150 °C, and -52 to +240 °C is available on request.
04Is there an Ex d version?
Yes, flameproof versions have ATEX and IECEx certification and need no isolating switch amplifier.
05Which contact types exist?
SPST-NO and SPDT-CO, with up to two switching outputs.
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