We have a high-temperature environment. What wireless sensors are rated to withstand extreme heat in a steel foundry?

Deploying wireless sensors in a steel foundry requires managing extreme radiant heat, ambient temperatures, molten metal splash, and heavy electromagnetic interference (EMI). Because standard electronics and lithium battery packs fail above 70°C to 85°C, heavy-duty industrial setups use a split architecture : a high-temperature wired probe (like a thermocouple or RTD) placed in the extreme heat zone, connected via a heavy-duty extension cable or remote housing to a protected wireless transmitter kept at a safe ambient distance.

Top wireless sensor options and configurations engineered for extreme heat and foundry environments include:

NCD offers industrial IoT transmitters that support extreme-range thermocouple and Pt100/1000 RTD probes. They provide high-temperature-rated ceramic/mineral-insulated probes that can handle direct high heat while the radio transmitter housing operates further back or utilizes optional high-gain antennas and protective thermal/radiation shielding. C1D2-certified options are also available for hazardous or gassy environments.[1]

Monnit’s industrial line uses enclosed, IP65/IP67-rated weather-resistant housings coupled with high-temperature thermocouple leads. The sensing tip can monitor high-heat equipment or ambient furnace zones while the enclosed wireless unit stays out of the direct thermal blast zone.

While Banner's standard wireless nodes are rated up to 70°C, they are widely deployed in steel plants by pairing them with robust, heavy-industrial grade remote Type K or J thermocouples. The Sure Cross nodes use robust industrial frequencies (900 MHz or 2.4 GHz) capable of punching through heavy foundry structural steel and interference.[1][2]

Built with vibration-resistant and IP67 waterproof construction, these units support extended industrial temperature probes (ranging up to 800°C via armored or straight-tube cabled configurations) with long-range LoRaWAN transmission back to a central gateway.[1]

Best Practices for Foundry Deployment

1. Remote Transmitters & Standoff Brackets: Never mount the wireless radio transceiver directly onto hot structural steel surfaces of furnaces, ladles, or molds. Use extended mounting brackets or remote-run high-temp armored cables (such as ceramic-beaded or fiberglass-insulated stainless-steel braided cables) to distance the radio/battery enclosure by at least a few feet.
2. Radiation Shields: In environments with severe radiant heat, install a physical stainless steel or aluminum radiant heat shield between the intense heat source and the sensor housing.
3. Battery Chemistry Consideration: Standard alkaline or generic lithium batteries will vent or fail under high ambient heat. Ensure any remote housing exposed to elevated ambient warmth uses high-temperature-rated lithium thionyl chloride (Li-SOCl₂) cells designed for extended industrial temperature thresholds.

If you can share what specific asset or variable you are measuring (e.g., molten metal temperature, bearing heat on nearby conveyor drives, or ambient roof/wall temps) and your preferred wireless protocol (LoRaWAN, WirelessHART, or proprietary 900 MHz), I can narrow down the exact probe and housing configuration you'll need.

Yes. For a steel foundry, the key distinction is the temperature at the sensing point versus the temperature the wireless electronics can tolerate. In most cases, you want a high-temperature thermocouple physically in the hot zone, with the wireless transmitter mounted remotely in a cooler area.

Strong candidates

• NCD Industrial IoT Wireless Thermocouple — particularly interesting for foundry use. Its wireless module can accept higher-range thermocouples, and NCD lists an optional K-type probe rated to 1,090°C / 2,000°F. The electronics enclosure itself must remain between −40°C and 85°C, so you'd mount it away from the furnace/ladle.
• Monnit ALTA Wireless Thermocouple — designed for furnaces, kilns, boilers and other high-temperature applications. Depending on probe configuration, it supports temperatures up to roughly 1,250°C / 2,282°F; the wireless transmitter needs to be kept much cooler than the probe.
• Omega/Dwyer UW Series Wireless Thermocouple Transmitter — supports K, N, R, S, B and other thermocouples with measurement ranges extending to 1,820–2,315°C, depending on thermocouple type. However, the transmitter enclosure itself is only rated −10°C to 70°C, so it must be remotely located.
• Linovision LoRaWAN IOT-S500PT — a useful option where long-range LoRaWAN is desirable. Its high-temperature version is rated −50°C to 800°C, with customizable sensing up to 800°C, and uses a remote probe connected to the wireless unit.
• Yokogawa YTA510 — a more conventional process-industry wireless transmitter. It accepts K, N, R, S, B and other thermocouples and has industrial wireless/ISA100 capabilities, but its electronics are rated only to 85°C ambient, making it suitable when the thermocouple is extended into the hot zone.

What I'd choose for a steel foundry

If you're monitoring furnace walls, refractory, molten-metal equipment, ladles, transfer lines, or other locations approaching 800–1,100°C, I'd start with a wireless thermocouple transmitter + remote high-temperature thermocouple, rather than looking for a wireless sensor whose entire body can sit at those temperatures.

For example, the NCD system's optional K-type probe reaches 1,090°C, while the wireless electronics stay outside the extreme-heat zone.

For molten steel itself, temperatures can exceed what a conventional K-type arrangement is intended for. In that case, Type R, S, B or specialized foundry thermocouples/pyrometers may be more appropriate. There are wireless foundry pyrometers specifically designed for molten steel and steel mills as well.

• Linovision LoRaWAN High-Temperature Wireless Sensor - $189.00 (Hinovision Solutions LLC (Linovision USA))
• Erbessd Phantom Wireless Thermocouple Module - $259.95 (Erbessd Instruments)
• Omega UW Series Wireless Dual Thermocouple Transmitter - $732.26 (hkcalibrations)
• Monnit ALTA Wireless Thermocouple Sensor - $155.91 (TeciSoft)

Important: Don't select based solely on the advertised probe temperature. In a foundry, radiant heat can destroy a transmitter even when the measured process temperature is within its nominal range. Check the electronics ambient rating, radiant-heat exposure, enclosure/IP rating, battery temperature limit, wireless propagation through the building, and required hazardous-area certification.

If you tell me your approximate temperature (e.g. 300°C, 600°C, 1,000°C, or molten steel ~1,600°C) and what you're measuring—furnace, ladle, molten metal, bearing/motor, refractory, etc.—I can narrow this to 3–5 specific systems and compare their temperature rating, wireless range, battery life, and approximate cost.

Deploying wireless sensors in a steel foundry requires an architecture that separates the radio/battery housing (which must stay relatively cool, typically -40°C to 85°C) from the sensing element/probe (which can withstand extreme process or ambient heat up to 1000°C or higher). Placing a standard plastic or lithium-battery wireless transmitter directly in a high-radiation or high-ambient heat zone will cause battery failure or thermal shutdown immediately.

Top industrial wireless sensor solutions designed with remote probes or high-heat thermal decoupling for foundry environments include:

Add to list These rugged, NEMA 4X / IP65-rated industrial transmitters operate within standard ambient limits (-40°C to 85°C), but accept high-temperature K-Type Thermocouples or RTD leads spanning up to 400°C or specialized high-range configurations up to +370°C (and higher with specialized mineral-insulated probes). This lets you mount the wireless radio away from the intense heat source using extended leads. View options on the Monnit Industrial High Temperature Sensor Page.[1][2][3]

Add to list NCD builds long-range industrial IoT wireless transmitters housed in weather-sealed enclosures that interface with high-temperature probes. By utilizing high-temperature ceramic or stainless-steel shielded thermocouple probes, they can monitor furnaces, kilns, and molten metal adjacent environments while keeping the radio transmitter safely distanced in a lower ambient temperature bracket. Explore specifications on the [NCD Industrial Wireless Thermocouple Go to product viewer dialog for this item. Overview](https://ncd.io/blog/industrial-wireless-thermocouple-high-temperature-sensor-brochure/).[](https://ncd.io/blog/industrial-wireless-thermocouple-high-temperature-sensor-brochure/)

Add to list While many ifm sensors use wired connections, their high-temperature specialized sensors (like the IG series) tolerate ambient temperatures up to 180°C using robust stainless steel barrels and silicone extension cables that route signals out to remote IO-Link wireless masters. Check product details via ifm IG6614 High-Temperature Sensor.[1]

Key Best Practices for Foundry Deployment:

1. Remote Probing: Always use remote-lead thermocouples or RTDs rather than compact all-in-one wireless pucks.
2. Radiative Shielding: Use ceramic or stainless-steel thermal baffles/shields if the probe cable must pass through direct line-of-sight radiant heat zones (such as near an open hearth or induction furnace lid).
3. Frequency Hopping: Ensure your wireless protocol (such as FHSS or ISA100.11a / WirelessHART) can punch through heavy electromagnetic interference (EMI) typical around heavy foundry electric arc furnaces.[1]

To help narrow down the ideal setup, could you tell me:

• What specific equipment or metric are you monitoring (e.g., furnace skin temperature, ambient casting heat, exhaust ducts)?
• What is the approximate peak temperature at the measurement point?

Yes—but in a steel foundry, the key distinction is the temperature at the sensing point versus the temperature the wireless electronics/battery must withstand. Most conventional wireless transmitters top out around 85–125°C, so you generally want a remote high-temperature thermocouple with the radio/electronics kept in a cooler zone.

Good options

The NCD approach is particularly interesting for a foundry: its optional Type-K assembly uses ceramic-fiber insulation and Inconel 600 components, with a stated 980°C continuous and 1090°C short-term rating.

• Erbessd Phantom EPH-T25 Wireless Thermocouple Module - $259.95 (Erbessd Instruments)

Monnit also specifies full K-type capability from −200°C to 1250°C, although the standard fixed and quick-connect probes themselves have substantially lower maximum operating temperatures, so the probe configuration matters.

For an actual steel foundry

I'd favor this architecture:

High-temperature Type K/N/R/S thermocouple → high-temperature mineral-insulated/ceramic cable → wireless transmitter located in a shielded/cooler area → gateway outside the hot zone.

If you're monitoring molten metal, ladles, furnace walls, refractory, or radiant surfaces, the right choice can differ considerably. For example, OMEGA's UW wireless infrared system measures up to 538°C without contact, which can be useful for accessible hot surfaces but isn't appropriate for molten-steel temperatures.

Also, don't assume a sensor advertised as "1250°C" can have its battery and radio sitting at 1250°C. In many systems, that number applies to the thermocouple/probe while the transmitter has a much lower ambient-temperature limit.

If you tell me the approximate maximum temperature (e.g. 300°C, 600°C, 1,200°C, 1,600°C) and what you're measuring—furnace wall, molten steel, ladle, bearing/motor, exhaust, etc.—I can narrow this to 3–5 specific sensors and compare their temperature rating, wireless range, hazardous-area certification, and expected battery life.

Yes. For a steel foundry, the key distinction is sensor/probe temperature rating vs. electronics/enclosure ambient rating. Many products advertise a 300–500°C measurement range, but the wireless electronics may only tolerate ~85–120°C continuously.

Strong candidates

• Linovision LoRaWAN Wireless Industrial Temperature Sensor - $189.00 (Hinovision Solutions LLC (Linovision USA))

• Erbessd Phantom Wireless Thermocouple Module - $259.95 (Erbessd Instruments)

• Monnit ALTA Industrial Wireless High Temperature Sensor - $186.08 (TeciSoft)

• Monnit ALTA Industrial Wireless Thermocouple Sensor - $216.27 (TeciSoft)

• Linovision LoRaWAN Industrial Temperature Sensor — advertised measurement range up to 800°C (1,472°F). This is one of the more interesting options if your actual process temperatures are above the ~370°C ceiling of many wireless RTD products.

• Erbessd Phantom EPH-T25 — wireless Bluetooth module accepting Type-K thermocouples, with a stated measurement capability up to 1,250°C (2,282°F). This is much more appropriate for very hot process measurements where the probe is exposed but the electronics can be positioned away from the heat.

• Monnit ALTA Industrial High-Temperature — -50 to 370°C (700°F) using a glass-coated platinum RTD. It is specifically marketed for furnaces, heaters and other high-temperature applications.

• Monnit ALTA Industrial Thermocouple — worth considering when you need a thermocouple rather than an RTD, particularly if the location is hot and humid/wet; Monnit specifically recommends its thermocouple sensors for high-temperature locations where condensation or humidity is an issue.

Another industrial option

Phase IV Engineering Leap Sensors can be configured with RTDs and thermocouples. Their high-temperature wireless node can survive 250°C (482°F) for limited periods, while the actual RTD element can be rated to 500°C. This makes it more suited to transient exposure—such as equipment passing through an oven—than continuous foundry furnace exposure.

There is also Yokogawa XS550, which is particularly interesting if the foundry has hazardous-area requirements: its wireless system supports thermocouples and is certified for Zone 1 installations, including steel plants. However, I'd want to verify the exact allowable ambient temperature at your proposed mounting point before specifying it.

For a steel foundry, I'd narrow it down this way

For an actual steel foundry, I would generally favor a thermocouple with a long high-temperature probe and put the wireless electronics/battery outside the hottest zone. Trying to put a battery-powered wireless transmitter directly beside molten-metal temperatures is a very different—and much harder—requirement than measuring 500–1,200°C with a probe whose electronics are tens of feet away.

If you tell me the maximum continuous temperature (°F/°C), whether you're measuring molten metal, furnace walls, bearings, ducts, etc., and roughly how far the sensor is from the gateway, I can narrow this to 3–5 specific systems and compare their temperature rating, wireless protocol, battery life, hazardous-area certifications, and approximate cost.

Deploying wireless sensors in a steel foundry requires managing extreme radiant heat, heavy thermal cycling , conductive surface temperatures, and harsh electromagnetic interference (EMI). Standard electronics and commercial wireless housings fail quickly under these conditions.

Depending on what you need to measure (e.g., direct high-heat process temperatures versus ambient/surface vibration on hot machinery), different specialized sensor architectures and ratings are used:

1. High-Temperature Process & Core Temperature (Thermocouples & RTDs with Remote Transmitters)

When measuring internal or high-heat zones (such as furnaces, kilns, or exhaust flues up to 1000°C to 1300°C+), standard wireless electronics cannot be placed directly in the heat zone.

Add to listThe Architecture: A heavy-duty, high-temperature mineral-insulated thermocouple (e.g., Type K, S, or B) is inserted into the extreme heat zone. A heavy-gauge extension wire or rigid standoff pipe routes the signal away from the radiant zone to a remote Industrial Wireless Thermocouple/RTD Transmitter (such as NCD IoT Long Range Wireless Thermocouple Transmitters Go to product viewer dialog for this item. ) mounted in a protected, cooler perimeter zone or housed inside a NEMA 4X / IP66 enclosure with a ceramic or steel thermal radiation shield.[1]

2. Machinery Health & Vibration Monitoring (Near Hot Mill Stands and Casting Floors)

For tracking the vibration and surface health of motors, bearings, and gearboxes operating near radiant heat sources, standard plastic-housed sensors degrade or melt.

Add to listRuggedized Stainless Steel Sensors: Devices like the [ifm VWV001 Go to product viewer dialog for this item. / VWV002 Wireless Vibration Sensors](https://www.ifm.com/us/en/product/VWV001) feature 316L stainless steel housings and IP68 ratings. While their internal electronics are rated for standard industrial ambient limits (typically up to 80°C / 176°F), they can be deployed on hot-adjacent assets if placed just outside the direct radiant plume or coupled with custom heat-sink mounting studs.[1][2]

Add to listShielded/Jacketed Solutions: For extreme load and weighing cells exposed to massive radiant heat, specialized systems like the Eilon Engineering Ron 2501 Wireless Crane Scale Go to product viewer dialog for this item. utilize dedicated thermal fabric jackets and steel plate heat shields to deflect direct radiant energy away from the internal electronics and load cell.

Best Practices for Foundry Deployment

• Standoffs and Heat Shields: Always use thermal barriers, ceramic spacers, or stainless-steel deflector plates between the hot surface and the wireless transmitter body.
• Line-of-Sight & RF Interference: Steel foundries are full of dense metal structures, moving cranes, and large electrical fields. Opt for robust industrial wireless protocols (such as long-range sub-GHz mesh or secure proprietary 2.4 GHz systems with strong error correction and high gain antennas) to prevent dropped packets.[1][2]
• Isolate Housing vs. Probe: Treat the sensing tip (the part touching or facing the heat) and the radio housing (the part containing the battery and transceiver) as two separate thermal zones.

If you can share what specific variable you are trying to measure (e.g., molten metal temperature, bearing vibration on a hot exhaust fan, or ambient air) and the approximate ambient temperature at the mounting location , I can recommend a specific sensor model and shielding setup.

In a steel foundry environment, deploying wireless sensors requires a clear distinction between two critical temperature zones: the process/measurement tip temperature (the extreme heat of molten metal or furnaces reaching up to 1,000°C to 1,600°C+) and the ambient/housing temperature where the wireless transmitter and electronics reside (subject to intense radiant heat, dust, vibration, and corrosive gases).

Because standard wireless electronics (batteries, RF transceivers, and digital logic) fail if exposed directly to ambient temperatures above 85°C (185°F) to 105°C, heavy-duty foundry solutions rely on remote-mount configurations (placing the transmitter away from the radiant heat zone using extension wire/armored cabling) or specialized heavy industrial housings with thermal barriers/heat sinks.[1]

Top Industrial Wireless Sensor Systems for High-Heat Environments

1. Emerson Rosemount Wireless Temperature Transmitters Go to product viewer dialog for this item. (e.g., Rosemount 648 / 3145R Series Go to product viewer dialog for this item.)

• Design & Rating: Emerson provides industry-standard WirelessHART networks built for harsh process industries. For high-temperature or high-radiant areas, they use remote-mount sensor configurations.
• Temperature Capability: The transmitter housing handles standard industrial ambient bounds (typically up to -40°C to 85°C), but when paired with heavy-duty high-temperature or ceramic-insulated thermocouples via long extension cables/necks, the probe tip can measure extreme process heat well over 1,000°C.
• Why it fits foundries: Features heavy-duty cast aluminum or stainless-steel housings, IP66/IP67 ingress ratings, and robust WirelessHART mesh reliability that punches through heavy industrial interference and metal obstructions.

2. NCD Industrial Long-Range Wireless Thermocouple / RTD Transmitters (C1D2 Certified Options)

• Design & Rating: Offers modular long-range wireless mesh architecture (using secure 900MHz or international frequencies) with options for NCD C1D2 Certified Wireless Thermocouple Sensors rated for hazardous or heavy industrial environments.[1]
• Temperature Capability: Uses specialized high-temperature probe extensions—such as Inconel 600 overbraided or Nextel ceramic fiber insulated thermocouple wires—allowing continuous sensing up to 980°C (1,800°F) and short-term service up to 1,090°C (2,000°F) at the tip, while keeping the battery-powered radio housing safely bracketed outside the direct radiant zone.[1]
• Why it fits foundries: Extremely long transmission range (up to 2 miles line-of-sight), AES-128 encryption, and modular support for standard high-temp Type B, S, K, or R thermocouples.[1]

3. Monnit ALTA Industrial Wireless High-Temperature Sensors Go to product viewer dialog for this item.

• Design & Rating: Housed in NEMA 4X, IP65/IP67 weatherproof enclosures, built to withstand volatile industrial settings.[1]
• Temperature Capability: Utilizes high-temperature RTD or thermocouple probes with lead lengths ranging from 3 feet up to 100 feet, allowing the probe to monitor critical high-temperature assets up to +370°C (+700°F) or higher depending on the probe variant, while the encrypted wireless transceiver stays in a cooler ambient zone.[1]
• Why it fits foundries: Excellent for monitoring pre-heat ovens, annealing lehrs, cooling ducts, and auxiliary machinery where remote probing is practical.[1]

Key Deployment Best Practices for Steel Foundries

• Remote Mounting is Mandatory: Never mount the wireless radio/enclosure directly onto a hot surface or in the direct line of sight of open molten metal radiant heat. Use extended armored or ceramic-beaded thermocouple leads (3m to 10m away) to locate the transmitter behind structural shielding or further down support columns.
• Material Selection for Probes: Standard stainless-steel sheaths will oxidize or melt near liquid steel or high-draw furnaces. Specify Inconel 600 Go to product viewer dialog for this item. , ceramic-sheathed, or specialized noble-metal thermocouples (Type S or B) for extreme process points.
• Wireless Frequency Considerations: Steel foundries are dense with moving cranes, large structural steel beams, and electromagnetic interference from induction furnaces. Opt for robust industrial mesh protocols (like WirelessHART or sub-GHz proprietary long-range mesh like 915MHz / 868MHz) rather than standard crowded 2.4GHz Wi-Fi when possible to prevent dropped packets.[1][2][3]

To help narrow down the exact configuration you need, could you share:

• What specific asset or process are you monitoring (e.g., ladle pre-heater, furnace shell, exhaust duct, or cooling bed)?
• What is the approximate process temperature at the measurement point and the ambient temperature where the transmitter would sit?

Yes. For a steel foundry, I’d generally avoid putting the wireless electronics directly in the hottest zone. The better architecture is a high-temperature thermocouple probe + wireless transmitter located in a cooler area, with the probe connected by a heat-rated cable.

A few options worth evaluating:

** | Probe measurement up to 1,250°C / 2,282°F | Bluetooth | Very high-temperature measurements where the electronics can be kept away from the heat | | **

** | Up to 800°C / 1,472°F | LoRaWAN | Long-range plant-wide monitoring | | Monnit ALTA Wireless Thermocouple | Fixed probe transmitter up to 400°C / 752°F; K-type configurations can support higher probe temperatures | Proprietary wireless | Industrial monitoring and alarms | | Omega UW Series Wireless Thermocouple | Depending on thermocouple type, up to 1,760°C / 3,200°F (R/S); K up to 1,260°C / 2,300°F | Wireless receiver system | Heavy industrial/process applications | | NCD Wireless Thermocouple | Electronics rated to 260°C / 500°F; K-type probe | 2.4-GHz wireless | Lower-cost industrial monitoring |

The Omega UW Series is particularly interesting for foundry work because it supports multiple thermocouple types, including K, R, S, B, and N, with R/S thermocouples rated to about 1,760°C. Its wireless transmitter is separate from the thermocouple sensing element.

• Phantom EPH-T25 Wireless Thermocouple Module - $259.95 (Erbessd Instruments)

What I'd choose for a steel foundry

If you're measuring molten steel, furnace interiors, ladles, or very hot refractory surfaces, I'd look first at a Type K, N, R, or S thermocouple with a remote wireless transmitter, rather than a conventional wireless temperature sensor.

For example:

• Up to ~1,000–1,200°C: Type K or N can be appropriate.
• ~1,200–1,600°C: R or S is generally more appropriate.
• Molten steel temperatures (~1,500–1,700°C): look at R/S/B thermocouples and appropriate refractory/ceramic protection, rather than relying on the transmitter's advertised temperature range.
• Ambient around the transmitter >100–150°C: this becomes a separate engineering problem; you'll likely need a remote transmitter, heat shield, thermal standoff, or water-cooled/air-cooled mounting.

One important distinction: a product advertised as measuring 1,250°C does not mean its wireless electronics can sit in a 1,250°C environment. For example, Monnit's system can measure high temperatures through the thermocouple while the transmitter itself needs to remain within its specified ambient operating limits.

If you tell me where in the foundry you're measuring (furnace, ladle, casting line, conveyor, mold, refractory, etc.) and the approximate ambient temperature at the sensor location, I can narrow this down to 3–5 specific industrial sensors and compare temperature rating, wireless range, battery life, enclosure/IP rating, and hazardous-area certification.

Yes. For a steel foundry, the key distinction is the temperature of the sensing point versus the temperature the wireless electronics can actually survive. Many products advertise 500–2,000°F measurement capability, but the radio/battery enclosure must usually remain much cooler.

Strong candidates

• Phantom EPH-T25 Wireless Thermocouple Module - $259.95 (Erbessd Instruments)

• Linovision LoRaWAN Industrial Temperature Sensor - $189.00 (Hinovision Solutions LLC (Linovision USA))

• Monnit ALTA Industrial Wireless High Temperature Sensor - $196.22 (Absolute Automation USA)

• NCD 3-channel Industrial Wireless Thermocouple — probably the most interesting architecture for a foundry. The electronics enclosure is rated only to 85°C/185°F, but the thermocouple probe can be upgraded to 1,090°C/2,000°F. It supports K-type and other thermocouple types and long-range wireless mesh.

• Monnit ALTA Industrial High-Temperature — wireless RTD measurement from −50°C to 370°C (−58°F to 700°F). It's explicitly intended for furnaces, ovens, heaters and boilers.

• Theta Sensors ST103-L / ST100-KL — LoRa wireless sensors with thermocouple options. The ST103-L is specified to 600°C/1,112°F, while the external-probe ST100-KL goes as high as 1,350°C/2,462°F.

• NCD Long-Range Wireless Thermocouple — standard probe to 260°C/500°F, but the transmitter can accept higher-temperature K-type probes.

• Phase IV / Leap Sensors high-temperature wireless RTD — the RTD itself is rated to 500°C/932°F, while the electronics are rated to 120°C and the housing can survive specific short-duration exposures up to 250°C/482°F. This is more suitable for transient furnace exposure than continuous foundry ambient temperatures.

What I'd use in a steel foundry

If you're measuring molten metal, ladles, furnace walls, molds, or refractory, I'd favor a remote thermocouple with the wireless transmitter mounted well away from the heat. For example:

High-temperature probe → mineral-insulated/armored thermocouple cable → wireless transmitter in a cooled/shielded location.

That approach is substantially more robust than putting a battery-powered wireless node directly beside a furnace.

For continuous temperatures above ~500°F, I'd especially investigate the NCD/Theta thermocouple configurations rather than an integrated wireless RTD. The NCD system, for example, separates the 2,000°F-rated probe from electronics limited to 185°F.

Also, if the foundry has flammable gas/dust or classified hazardous areas, certification matters as much as temperature rating. Yokogawa's XS550/XS110A, for example, is designed for hazardous-location installations including steel plants, although its wireless module's ambient operating limit is only 85°C/185°F.

If you tell me the maximum temperature at the sensor location (e.g. 400°F, 800°F, 1,500°F, 2,500°F), what you're measuring, and whether the sensor itself must sit in the hot zone, I can narrow this to 3–5 specific industrial models and compare temperature rating, wireless range, battery life, hazardous-area certification, and approximate price.

In a steel foundry, deploying wireless sensors requires a clear division between the sensing element (which can endure extreme heat, like molten metal or furnace interiors up to +1000°C or more) and the wireless transmitter/housing (which must be thermally isolated, remote-mounted, or shielded because internal electronics generally fail above +125°C).

Industrial wireless sensors engineered to survive these heavy-duty environments rely on rugged enclosures (such as 316L stainless steel or heavy-duty cast housings), welded seams, specialized Lithium-thionyl chloride (Li-SOCl₂) batteries rated for wide thermal windows, and robust communication protocols like WirelessHART or LoRaWAN to punch through electromagnetic interference (EMI) from electric arc furnaces (EAF). [1][2]

Top choices and configurations rated for extreme heat and foundry conditions include:

Industry standard for heavy heavy-industries. The transmitter housing is remote-mounted or thermally isolated away from the intense radiant heat point, paired with high-temperature thermocouples (Type B, S, or K) that can measure extreme process temperatures. It utilizes the secure WirelessHART protocol, designed to resist harsh plant EMI.

Features an external RTD probe tethered by a high-temperature lead wire, allowing the probe itself to handle extreme environments (up to +370°C for standard high-temp variants) while the robust NEMA 4X / IP65-rated Monnit Industrial-Grade Wireless High Temperature Sensor Go to product viewer dialog for this item. housing sits safely outside the direct radiant zone.[1]

Built with vibration-resistant construction and IP67 waterproof/dustproof enclosures. When paired with armored high-temperature probes, they can span extreme fluid or surface ranges (-200°C up to +800°C) using high-capacity Li-SOCl₂ internal batteries designed for multi-year industrial lifespans.[1]

For mechanical load/weight monitoring near molten metal, these systems incorporate specialized thermal fabric jackets and steel plate heat shields to deflect extreme radiant heat away from the load cell and wireless transmission node.

To help narrow down the exact setup you need, could you share:

• Where precisely you are placing the sensor (e.g., direct furnace wall, near the EAF, ladle monitoring, or ambient roof)?
• What peak temperature and measurement type (surface, ambient, or immersion) you are targeting?