Brand: JUMO

JUMO MAERA S26 Hydrostatic Level Probe for Tanks and Wells

Name: JUMO MAERA S26 Hydrostatic Level Probe | Seven Star LLC
Brand: JUMO
SKU: MAERA S26

Description

A stainless-steel probe for water, grey water and fuel tank levels

The JUMO MAERA S26 (type 402090) is a submersible level probe that measures the hydrostatic pressure of the liquid above it with a piezoresistive silicon cell behind a 316L membrane and returns a signal proportional to level. A vented cable with an integrated pressure-compensation hose automatically cancels barometric changes. Ranges run from 0 to 0.25 bar up to 0 to 10 bar, which corresponds to filling heights between about 2.5 and 100 metres of water column, though JUMO describes typical ventilated-tank use as 2.5 to 25 mWS. Typical fields are storage tanks and reservoirs, grey-water recycling, heating-oil and diesel tanks and the water and wastewater sector; the probe is approved for use in drinking water when the right extra code is chosen. Basic type 023 offers improved linearity of 0.2 % of span in ranges from 0.6 to 2.5 bar.

Technical specifications

Parameter	Specification
Type	402090/000 standard; /023 improved accuracy; measuring principle piezoresistive with stainless-steel separating membrane
Ranges (relative)	0 to 0.25, 0.4, 0.6, 1, 1.6, 2.5, 4, 6, 10 bar; special ranges on request (code 999)
Linearity	0.3 % of span (0.2 % for 0.6 to 2.5 bar with type 023, and 4 to 10 bar ranges)
Accuracy 0 to 50 °C	0.3 to 0.5 % of span; 0 to 20 °C … 0.5 to 1.6 % depending on range; long-term stability up to 0.3 % per year
Overload and burst	0.75/1 bar for 0.25 bar range up to 30/40 bar for 10 bar range
Output codes	402 0-20 mA 3-wire; 405 4-20 mA 2-wire; 406 4-20 mA 3-wire; 412 0.5-4.5 V ratiometric; 415 0-10 V; 418 1-5 V; 420 1-6 V; T90 10 ms or less
Supply	10 to 30 V DC (2-wire 4-20 mA); 11.5 to 30 V DC (3-wire current, 0-10 V); 5 V (ratiometric); up to 25 mA; reverse-polarity protected
Process connections	567 G 1/4 internal; 658 closed at bottom; 659 open at bottom; 759 mounted protective cage Ø 95 mm
Cable types	14 PUR pebble grey; 15 PE-LD black; 25 FEP black (all shielded, UV-resistant, vented); 26 EPR submersible-motor cable, blue (4-20 mA two-wire only)
Cable length	5 m to 100 m in steps (order codes 005 to 100); outer diameter about 8.4 mm; tensile force up to 400 N
Medium temperature	0 to 50 °C (probe); cables -20 to +60 °C (EPR) or -40 to +60 °C (cable without compensation hose)
Materials	Housing and connection 316Ti; membrane 316L; FPM or EPDM sealing cone; PA compensation hose
Weight	About 200 g without cable plus 1500 g with protective cage; PE 63 g/m, PUR 115 g/m, FEP 90 g/m, EPR 92 g/m
Extra codes	061 UL (PUR cable); 593 cutting-ring fitting; 631 improved moisture/vibration protection; 881 drinking-water approval (EPDM seal, PE or EPR cable); 917 EPDM seal
Use	Indoor mounting; vertical or hanging from the cable

Configuring the probe

The code is 402090/ basic type – range – output – process connection – material – cable type – cable length / extra code. The datasheet example is 402090/000-454-405-659-20-15-010/000: a 0 to 1 bar probe with two-wire 4 to 20 mA, open connection at the bottom, 316Ti, black PE-LD cable of 10 m. Choose a cable that suits the liquid: PUR for general water, PE-LD for drinking water, FEP for aggressive or fuel media, and EPR for a submersible motor-grade cable. Drinking-water approval (881) requires EPDM sealing and either the PE or EPR cable. Accessories include a terminal box with pressure compensation element (00061206), a cable clamp for 4.8 to 10 mm cables (00753260), a sealing screw with G 1 1/2 thread (00333329) and a pressure-compensation filter (00382632). Always keep the compensation hose unkinked, since a pinched hose stops barometric compensation.

Applications and neighbours in the range

A 10 mWS range suits a 10 m rainwater cistern or a deep tank; a 1.6 to 2.5 bar range suits fuel day tanks and sumps. In hot regions, mount the terminal box above the liquid in shade, because condensation at the end of the compensation hose is the most common fault in vented probes. The S26 is a general-purpose version beside the published MAERA S25 and the titanium MAERA S29 SW for seawater. For a float-type alternative see the NESOS R20 LT, or browse the level instrumentation category for switches and transmitters.

A good enquiry names the water depth or pressure range, the output signal and wiring (2-wire or 3-wire), and the cable length from 5 to 100 m. Please state the cable material, such as PUR, PE-LD, FEP or EPR, according to the medium and the temperature at the cable. Give the sealing material (FPM or EPDM) and any protective cage or open or closed bottom needed for sludge, sewage or clean water. The probe is used vertically or hanging from its cable at a medium temperature of 0 to 50 °C. The improved accuracy type 023 should be requested separately where small level changes matter.

Documents and quotation

The hosted document is JUMO data sheet 402090 (12 pages, English). Confirm range, cable material, cable length and approvals for the medium before ordering. Seven Star LLC is an independent supplier in Muscat; send the code and tank depth for a quotation.

Datasheets & Documents

Datasheet JUMO MAERA S26 data sheet 402090 (EN) Download

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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.