Brand: JUMO

JUMO safetyM STB/STW Safety Temperature Limiter

Name: JUMO safetyM STB/STW Temperature Limiter – Manual & Quote
Brand: JUMO

Description

Overview

JUMO safetyM STB/STW is a safety temperature limiter and safety temperature monitor built to DIN EN 14597, engineered to reliably detect and avert hazards to personnel, the environment, and production plant that could arise from thermal process malfunctions. Configurable as either a safety temperature limiter (STB) that requires manual reset after a trip, or a safety temperature monitor (STW) that automatically resets once the process temperature returns within the safe band, the JUMO safetyM STB/STW switches thermal systems to a safe operating state the instant a monitored process crosses its configured limit.

Working closely with plant engineers in the region, Seven Star LLC proudly supplies the JUMO safetyM STB/STW safety temperature limiter/monitor to industrial, thermal process, and machine building 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 safetyM STB/STW.

Working Principle

The JUMO safetyM STB/STW continuously monitors the process temperature via connected Pt100, Pt1000, or thermocouple sensors, comparing the measured value against a configured limit value. When the temperature crosses that limit, the device’s LED indicators (K1, K2) illuminate for the affected channel and the integrated relay output alarm switches the connected plant into a safe operating state, referred to as the alarm zone. A device built to the STB configuration requires deliberate operator acknowledgment to reset after tripping, ensuring a hazardous condition is investigated before restart, while an STW configuration automatically resets once the sensor temperature has fallen or risen back past the limit by the configured switching differential.

What sets the JUMO safetyM STB/STW apart is its 1oo2D device architecture: two independent measurement and evaluation channels continuously cross-check one another, giving the device the safe fault-detection capability required by DIN EN 61508 and DIN EN 13849, and making it suitable for applications governed by the EU Machinery Directive 2006/42/EC. This dual-channel structure allows the device to achieve SIL 3 and Performance Level e (PL e) certification, providing functional safety assurance appropriate for high-consequence thermal process protection.

Engineering Design of the JUMO safetyM STB/STW

The JUMO safetyM STB/STW accepts a wide range of sensor inputs, including Pt100 and Pt1000 RTDs (DIN IEC 60751:2008, -200°C to +850°C), thermocouples (Fe-CuNi, NiCr-Ni, and others), and 4-20 mA standard signals, with 12 configurable linearizations available to match the specific process sensor in use. A backlit LCD display with plain-text menus simplifies configuration and operation, and a USB interface paired with JUMO’s setup program allows configuration and archiving of device settings without opening the enclosure.

The device mounts on a standard 35 mm DIN rail and provides two SPDT relay outputs – one for pre-alarm (KV) and one for limit alarm, the latter with a fuse cut-out – along with a digital input filter with adjustable filter time constant to reject transient noise on the measured signal. A wide voltage supply range covers AC 110 to 240 V (+10%/-15%) or AC/DC 20 to 30 V, and the device carries IP20 protection with a polycarbonate housing rated UL 94 V0 for flame resistance. An Ex-rated variant (safetyM STB/STW Ex) extends approval into hazardous areas, with intrinsically safe [Ex ia] inputs allowing relevant probes to be connected directly.

Key Features

The JUMO safetyM STB/STW combines certified functional safety architecture with configuration flexibility that makes it a standard choice for thermal process safety protection.

1oo2D dual-channel architecture provides safe fault detection per DIN EN 61508 and DIN EN 13849.
SIL 3 and Performance Level e (PL e) approvals support high-consequence machinery and process safety applications.
Configurable as a manual-reset safety temperature limiter (STB) or an auto-reset safety temperature monitor (STW).
Accepts Pt100, Pt1000, thermocouple, and 4-20 mA signal inputs with 12 selectable linearizations.
A backlit LCD display with plain-text menus and USB-based setup program simplify configuration and archiving.
Two SPDT relay outputs (pre-alarm and limit alarm with fuse cut-out) support layered alarm escalation.
A wide voltage supply range (AC 110-240 V or AC/DC 20-30 V) supports diverse electrical infrastructure.
An Ex-rated variant with intrinsically safe [Ex ia] inputs extends the platform into hazardous area installations.

Industrial Applications

The JUMO safetyM STB/STW is deployed across heat-generating industrial systems, thermal process plants, and machinery subject to the EU Machinery Directive wherever reliable, certified overtemperature protection is required to prevent injury, environmental harm, or damage to production equipment. Typical duties include boiler and furnace overtemperature protection, thermal oil heater safety cutout, and process heating safety interlocks in general industrial and machine building applications.

With fast quotation turnaround and technical support, Seven Star LLC distributes the JUMO safetyM STB/STW to industrial facilities, thermal process plants, and machine builders throughout Oman and the GCC. The safety limiter is a strong fit for thermal process safety systems across the Sohar and Salalah industrial zones, as well as for general industrial and machine building applications across Muscat that require certified, dual-channel overtemperature protection.

Technical Specifications

The table below summarizes the core specifications of the JUMO safetyM STB/STW as supplied by Seven Star LLC.

Parameter	Specification
Model	JUMO safetyM STB/STW (701150)
Standard	DIN EN 14597
Architecture	1oo2D (dual-channel, cross-checked)
Functional Safety Rating	SIL 3 (DIN EN 61508), PL e (DIN EN 13849)
Sensor Inputs	Pt100, Pt1000 (-200°C to +850°C), thermocouples, 4-20 mA
Linearizations	12 configurable options
Relay Outputs	2x SPDT (pre-alarm KV, limit alarm with fuse cut-out)
Voltage Supply	AC 110-240 V (+10%/-15%) or AC/DC 20-30 V
Enclosure	IP20, polycarbonate, UL 94 V0
Mounting	35 mm DIN rail (DIN EN 60715)
Typical Applications	Boiler/furnace protection, thermal process safety, machine building

Request a Quote for JUMO safetyM STB/STW Safety Temperature Limiter

Seven Star LLC supports the full procurement cycle for the JUMO safetyM STB/STW safety temperature limiter/monitor, from formal RFQ submission to confirmation of availability and lead time, technical datasheet delivery, and direct consultation with our instrumentation division on sensor configuration, SIL/PL requirements, and Ex-area approvals for your application. With engineering support in Muscat, we supply every JUMO safetyM STB/STW with manufacturer documentation and local technical support. Contact Seven Star LLC today to request a quotation or discuss your thermal process safety 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 safetyM STB/STW Safety Temperature Limiter

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

01What is the difference between the STB and STW configurations?

The safety temperature limiter (STB) configuration requires a manual reset after the device trips, ensuring the hazardous condition is investigated before restart. The safety temperature monitor (STW) configuration resets automatically once the sensor temperature returns within the configured switching differential of the safe limit.

02What functional safety ratings does the JUMO safetyM STB/STW carry?

The device achieves SIL 3 per DIN EN 61508 and Performance Level e (PL e) per DIN EN 13849, supported by its 1oo2D dual-channel architecture that continuously cross-checks two independent measurement channels for safe fault detection.

03What sensor types can be connected to the JUMO safetyM STB/STW?

The device accepts Pt100 and Pt1000 RTD sensors (-200°C to +850°C), a range of thermocouple types, and 4-20 mA standard signals, with 12 configurable linearizations to match the specific sensor in use.

04Is a hazardous area version of the JUMO safetyM STB/STW available?

Yes. The safetyM STB/STW Ex variant carries ATEX approval and offers intrinsically safe [Ex ia] inputs, allowing relevant probes to be connected directly for use in classified hazardous areas.

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.