Temperature Sensing Solutions

Most industrial applications require pyrometer calibration at least once per year. High-criticality processes such as steel casting, glass melting, or pharmaceutical manufacturing may require calibration every 3–6 months or after any significant process change, instrument repair, or impact event.

Pyrometer calibration standard refer to the reference traceable sources and measurement protocols used to verify instrument accuracy. These include blackbody radiation sources calibrated against national measurement institutes (NMIs), transfer standard pyrometers, and documented uncertainty budgets all aligned with ITS-90 and ISO/IEC 17025 requirements.

Furnace calibration involves two processes: a system accuracy test (SAT), which measures total error in the temperature control loop, and a temperature uniformity survey (TUS), where calibrated thermocouples are placed at defined positions throughout the chamber to verify heat distribution.

Heating element ageing, sensor drift and calibration error occur throughout time and if you do not have a regular thermal survey and SAT verification performed at some point in time, these errors compound becoming a serious safety issue for the operation of the furnace. Regular furnace calibration prevents out-of-spec processing, product rejections, and non-conformances during audits.

Under AMS 2750H/CQI-9, a temperature uniformity survey is typically required quarterly or semi-annually depending on furnace class, while a system accuracy test is required monthly. Frequency also depends on furnace usage intensity and the applicable customer or process standard.

The primary standard is AMS 2750H. Furnaces are classified into Class 1 through Class 6 under AMS 2750H, each with defined temperature uniformity tolerances. Tempsens furnace calibration service supports compliance across all these frameworks.

The non invasive clamp sensor will be mounted externally on a pipe’s outer surface (with no penetration through the wall of the pipe) thus eliminating the need for drilling and welding when installing, while an Invasive sensor directly contacts the process (media) by means of a Thermowell. The noninvasive sensors calculates internal temperature using patented Thermal Algorithms that compensate for material type & thickness of the pipe, ambient temperature, and many other factors, where contaminants are not included in the measurement; Installation of non invasive clamp sensor will also be faster.

This includes using an integrated clamp to hold the clamp sensor in place to the pipe ensuring that there is proper contact between the temperature measurement sensor and the pipe surface. The user must also setup the pipe’s diameter, material, and output via the built-in keypad. Power is supplied through a separate power supply unit that connects to pin 1 of the temperature measuring device using a range of 12-28V DC, and the output connections are made from the non-invasive temperature device to indicate which reference points will provide the most accurate readings.

The non invasive temperature sensor from Tempsens offers an accuracy of ± 2 degrees Celsius, which is achieved when thermally attaching to a metal pipe under normal operating conditions. Calibrating with one reference point or multiple reference points establishes enhanced accuracy according to the type of material being measured, the insulation characteristics of the material being measured, and the actual environment (ambient temperature) in which the measurement is being performed.

Distributed temperature sensors utilize a single piece of optical fiber to provide continuous temperature readings over the total length of the fiber and can be read at thousands of locations at once; in contrast, RTDs and thermocouples only measure temperature at a limited number of separate points. Using a single fiber-based distributed temperature sensor allows for superior area coverage without the need to install multiple sensors. Distributed temperature sensors also require less cabling to connect to an end device and provide safe operation in potentially explosive environments since there are no electrical components located in the sensing area.

The Tempsens DTSenz Distributed Temperature sensing system has a temperature range that is standard from -20°C to +120°C, with specialized cables capable of operating outside of this range as well. The accuracy of the system is ±2°C over the maximum 16 km sensing distance, with a measurement time of 5 seconds. The temperature resolution is 0.1°C, which allows for low thermal deviation. Additionally, the position accuracy of ±0.5 meter provides for a precise location of any temperature variations along the monitored asset.

Fluorescence decay time measures the exponential time constant characterizing how rapidly fluorescent emission intensity decreases after excitation pulse termination. The FluoroSenz system measures this decay time with microsecond precision using advanced signal processing and converts it to absolute temperature through pre-established calibration curves specific to the rare-earth fluorescent material, providing measurements independent of fiber bending losses or connector degradation.

The FluoroSenz fluorescence fibre optic temperature sensor system is capable of reading temperatures between -40°C to 260°C with an accuracy of ±1°C and a resolution of 0.1°C throughout its entire operating range. The PTFE (Poly Tetra Fluoro Ethylene) sheath for the three-millimetre diameter sensing cables provides reliability in temperature ranges of -20°C to 65°C with consistent performance across all operating temperatures.

Fluoroptic temperature sensors (thermometers) are designed to provide complete galvanic isolation and provide complete immunity to electromagnetic interference, magnetic fields, and high voltage (up to 500kV) due to their design; including no metallic electrical conductors between the measurement location and the instrument. This non-conductive design provides complete protection from ground loops, induced currents, transient voltages, and ignition sources while continuing to provide accurate temperature measurement when conventional RTD and thermocouple designs would not or would permit concerns to become a primary hazard in high voltage transformers, switchgear, generators, and MRI machines.

The Fiber Bragg Grating (FBG) provides accurate readings of temperature, strain (both dynamic and static), vibration, pressure, and acceleration over a wide range (-20°C – 900°C). The unique characteristic of the FBG sensor is its ability to function as a multi-parametric monitoring device from a single fiber optic network by measuring the wavelength shift.

The Bragg wavelength is the light wavelength specifically reflected back from the fiber grating. A change in temperature or strain leads to a proportional shift of the Bragg wavelength, so it forms the basis for measurement.

FBG sensors have an accuracy of ±1.0°C. They provide approximately ±2 µε of strain accuracy. Fiber optic cables have high signal-to-noise ratio and can detect even the slightest variations in ambient conditions with high levels of sensitivity.

The Fiber Bragg Grating Sensor has a price point based on its channel configuration, amount of sensing points supported, temperature range and cable length. Tempsens have a competitive price offering that ranges from cost-effective single-point solutions up to full multi-channel networks designed for maximum value for all types of monitoring needs.

The online thermal camera continuously monitors equipment 24/7 and automatically generates alarms when anomalies appear, thereby allowing operators to detect equipment issues before failure occurs. Thermal cameras also allow for non-contact measurement, remove human error by recording data automatically in a database and saving the thermal images for current and future reference that can be used for meeting regulations and developing trends of equipment failure.

Thermal camera online systems have the capability to detect temperature anomalies that have been caused by electrical resistance, mechanical friction, or insulation degradation. These anomalies are detectable weeks or even months before physical symptoms become apparent. Through establishing baseline thermal signatures and monitoring for deviations from the baseline, maintenance teams can schedule maintenance actions during planned shutdowns and eliminate unplanned downtime when compared to similar systems without online thermal imaging.

A Pt100 RTD is a temperature sensor based on platinum that has a resistance of 100 Ω at 0 °C. A thermowell is a closed-end protective metal sleeve which protects the RTD from the process conditions which could involve pressure, chemical attack, velocity and mechanical shock. The thermowell allows the RTD to be replaced or recalibrated without interrupting the process.

Platinum has a near linear and extremely stable resistance-temperature relationship and has low drift over time. Pt100 elements have a consistent accuracy, good repeatability and very good material stability over a wide range of temperatures (-200 °C to 850 °C), which makes them the international standard for reasonable accuracy for industrial temperature measurement.

The selection depends on system design:

• Pt100 is preferred for high-accuracy industrial systems using 3-wire or 4-wire configurations, where cable resistance can be compensated.
• Pt1000 is advantageous in 2-wire circuits, long cable runs, and battery-powered or low-power installations because the higher base resistance reduces the influence of lead resistance and lowers self-heating effects.

Both are accurate; the choice is driven by wiring configuration, allowable uncertainty, and installation constraints.

Base metal thermocouples utilize alloys of nickel, iron, or copper, and are appropriate for medium to higher temperature ranges while being extremely mechanically robust. Noble metal thermocouples utilize platinum-rhodium alloys, allowing for extremely high temperature ranges (in excess of 1950 °C in some cases), low drift, and general applications requiring higher measurement stability and longevity.

Base metal thermocouples are extremely popular in steel mills, cement kilns, chemical reactors, refineries, boilers, industrial furnaces and general process heating systems for their mission-critical temperature sensing, control and monitoring functionality.

The thermal profile encompasses all the temperatures associated with a given product/process as it travels through the heating system. The thermal profile also graphically represents the time-temperature relationship, which is essential for validating/optimising the heating process, using Tempsens thermal profiling equipment.

In a Tempsens thermal profiling system, a thermograph records data about the temperature continuously and at the same time from multiple thermocouple sensors. The records of temperature with timestamps are stored in the memory of the SmarTrack 10 Data Logger. The temperature data is then analyzed and used to create a thermal profile.

In a Tempsens thermal profiling system, thermocouples generate a voltage that is proportional to the difference in temperature between their measurement junction and the reference junction. The SmarTrack 10 data logger uses this voltage to accurately convert it into a measured temperature with a resolution of 0.1°C within the specified measurement capacity of the thermocouple.

Make sure there is a clear optical view, set emissivity for the specific surface, be aware of the proper distance-to-spot ratio, and document the temperature shown.

The temperature is determined due to infrared radiation emitted from a surface converted to electrical signal temperature measures without coming into contact with the part. Such infrared methods are typically ideal for hot, moving, or hard-to-reach objects.

Boilers, rotary kilns, reheat furnaces, cement kilns, glass furnaces, and or other combustion chambers.

Some models include infrared to monitor temperature distribution.

Yes. The air purge continuously cleans the viewing area.

Pressure gauges can measure gauge pressure (based on atmospheric or ambient pressure), absolute pressure (based on a vacuum), compound pressure (vacuum to positive), and differential pressure. The selection can be based on the application.

Brass is fine for non-corrosive water and air. Select SS316 wetted parts for chemical service or saltwater. The sealed diaphragm with PTFE coating protects against aggressive or sanitary media.

A temperature gauge provides the reading in Celsius (°C), Fahrenheit (°F), or Kelvin (K) scales, including dual scale options when the application requires an absolute display °C/°F on a single dial.

Considerations include process temperature range, ambient temperature, required stem immersion, mounting orientation (bottom/back/every angle), type of process connection threads (BSP/NPT), accuracy class, and whether sanitary, explosion-proof, or thermo-well protection is required depending on the installation.

Bimetallic thermometers have standard ranges of -40°C to 600°C with an accuracy of Class 1; gas or liquid expansion thermometers have capabilities beyond up to 600°C (following the choice of the nominal ranges based on process operating temperatures, required scale resolution (i.e., 1°C to 10°C separation), and the measuring range versus nominal span placing as prescribed by EN13190).

Periodic visual inspection, such as examining the clarity of the dial and pointer movement, checking for stem integrity, checking for thermo-well condition (when installed), checking for the process connection to be tight, and checking in the zero-point all provide reliable in-service for a longer period; glycerin-filled gauges need inspection for fluid loss indicating the seal is beginning to lose its integrity.

Thermal imaging gives a clear view of the coldness or hotness of any object. A thermal image is a picture that shows the temperature of objects in the scene instead of how they look to the naked eye.

A thermal imager works by detecting infrared radiation (heat) emitted from objects and converting it into a visual image called a thermogram. Each pixel in the image represents a temperature point, allowing users to “see” heat patterns and identify temperature differences instantly—even in complete darkness or through smoke.

Infrared sensors are the core part of the thermal camera that detect heat emitted or reflected by objects. The sensor captures the heat, and the camera system interprets and displays it in a usable form. To be precise, a thermal camera is a sophisticated sensor system designed to visualize temperature — far beyond just measuring it.

A wireless temperature sensor is a modern monitoring instrument for measuring temperature, and it uses LoRa wireless technology to transmit data without wired connections and remote temperature sensing.

Tempsens high-quality wireless temperature sensors use LoRa spread spectrum modulation that allows for better signal penetration in industrial settings with longer ranges than conventional Bluetooth temperature sensors that operate on short-range communication.

You will find wireless temperature monitoring systems in manufacturing, pharmaceutical, food processing, HVAC, cold chain logistics, data centers, and process industries which serve as systems for industrial temperature sensors for precision of application.

Yes! There are specific requirements for each industry, from sanitary tri-clover connections for food processing to NACE certified material for sour gas applications. We build gauges industry-specific.

Most Tempsens gauges require little to no maintenance given their robust SS316/304 construction; periodic calibration checks, and seal inspections would be required to ensure ongoing accuracy and reliability.

Analyze your process medium, pressure/temperature range, accuracy required, environmental conditions, and connection specifications – our technical team would aid you for the best choices.

Yes, our temperature gauges range from -40°C to 600°C depending on model, with specialized versions for extreme high temperature applications.

All Tempsens gauges ship with factory calibration certificates, and we can provide recalibration services for on-going measurement traceability throughout the instrument lifecycle.

A dry block calibration is a temperature calibration device that uses a solid metal block to provide precise, stable heat for testing sensors without using fluids.

No spills, no contamination, faster stabilization, and field portability make it a more efficient tool.

Yes, Tempsens dry block calibrator models support multiple probe types and sizes via custom inserts.

Absolutely. Every calibrator is supplied with NABL traceable certificates and optional ISO 17025.

Yes. Tempsens offers dry blocks starting from –180°C to high-temp ranges upto 1700°C.

Yes, Tempsens the dry block temperature calibrator PDF is available for every model.

An “Online” Thermal Camera refers to a networked device to stream or transmit footage remotely.
A CCTV camera sees light; a thermal camera captures heat. Instead of detecting visible light, it senses infrared radiation and converts it into an image.

A thermal imager, also referred to as an infrared camera, is a device that detects infrared radiation emitted by objects and converts it into an electronic image, known as a thermogram, which accurately represents the surface temperature distribution of the measured object.

• Furnace monitoring (steel, glass, cement etc.)
• Electrical inspections (substations, switchyards)
• Mechanical inspections (motors, bearings, conveyors)
• Refractory lining condition
• Early Fire detection in coal yards, storage areas
• Process control in manufacturing and many more…

It depends on usage, but most industries recalibrate their sensors annually or semi-annually.

Heat: The energy movement from warmer to cooler objects through conduction, convection, or radiation.
Flux: the flow rate of energy passing through a given surface area.
heat flux: Thermal energy transfer rate per unit area over time, expressed in W/cm², W/m², or kW/m².

Heat flow refers to total thermal energy exchange between systems, while heat flux measures energy transfer rate per unit area.

Sensor options – Gardon Gauge or Schmidt-Boelter: Choose Gardon Gauge for high heat flux range (5-5000 W/cm²). Select Schmidt-Boelter for lower heat flux ranges (1-5 W/cm²).
Cooling options: Water cooling is recommended for measurements above 5 W/cm² lasting more than 5 minutes, or when sensor body temperature may exceed 200°C.

Uncooled sensors are suitable for brief measurements or lower heat flux levels. Water-cooled versions enable continuous operation at higher heat flux levels without time limits.

Our sensors provide ±3% to ±5% accuracy depending on the model, with repeatability of 2%.

All sensors provide 10mV linear output at full scale range with infinite resolution, requiring no external power supply.

Standard sensors measure total heat flux (radiation + convection). Radiometer versions with windows measure radiation only.

It depends on usage conditions. We recommend annual calibration for critical applications or after exposure to extreme conditions.

All sensors include manufacturer calibration certificates. ISO standard calibrations are available upon request.

Liquid bath calibrators provide better performance with high accuracy, particularly in laboratories and QA systems.

Silicone oils or alcohols based on the temperature range — we include recommendations and compatible fluids with each unit. 

RTDs, and thermocouples can be calibrated in the liquid bath temperature calibrator.

Fiber optic sensors are primarily used in temperature monitoring applications where traditional sensors are ineffective, particularly in environments with high electromagnetic interference, elevated voltages, or limited accessibility.

Optical sensors operate by detecting variations in the properties of light—such as wavelength shifts (in FBG sensors) or fluorescence decay time—caused by changes in surrounding physical parameters like temperature or strain.

Fiber optic sensors offer superior immunity to EMI, higher accuracy, faster response time, and long-term stability compared to conventional electrical sensors.

A blackbody calibrator is a temperature calibration furnace that emits precise thermal radiation at known temperatures to calibrate infrared sensors.

Tempsens provides benchtop and portable liquid bath calibrator models with applications in the field and lab.

• Set the cavity temperature, align the infrared sensor to the aperture, and compare readings with a reference standard. Based on the deviation, adjust the sensor output.

• Prices vary based on temperature range, features, and application depending on your industry. Contact Tempsens experts for the quote and let us help you with the best black body calibrators tailored for you.

Constant agitation, profound immersion, and thermal equilibrium guarantee consistent and stable temperature areas for accurate calibration.

• A black body is used to measure and calibrate non-contact temperature devices, including pyrometers, thermal imagers, and IR thermometers by providing a uniform radiation source.

– Security & Surveillance

– Industrial Monitoring

– Firefighting

– Medical & Veterinary

– Search and Rescue

– Building Inspection

– Resolution

– Frame rate

– Area to be covered (FOV)

– Temperature range

– Connectivity

– Software Integration

• An infrared camera functions by detecting infrared radiation (IR), which is a type of electromagnetic radiation emitted by all objects based on their temperature. 

  The identified IR radiation is transformed into electrical signals, which are then converted into a thermographic camera image, with various temperatures shown by distinct colors or shades.

• Thermal monitoring systems are an effective way to identify issues in industrial environments before they develop into problems. Continuous heat monitoring can enable insightful process optimization, timely preventative maintenance, and rapid identification of hazardous issues.

• Predictive maintenance is the technique or a proactive maintenance strategy that involves monitoring the real-time condition and performance of equipment to predict when a failure is likely to occur. It is generally used to detect various deterioration signs, anomalies, and equipment performance issues. According to the current situation, the company can predict when the instrument might fail and plan a necessary course of action.

Take into account fluid velocity, pressure, process temperature, compatibility, wake frequency limits, and mechanical loading factors.

A pyrometer is a device for measuring very high temperature. It measures temperature based on temperature and light which is emitted from the object, it requires no contact with the subject, similar to a thermometer.

Pyrometers, also known as radiation thermometers, infrared thermometers, or non-contact thermometers, are instruments designed to measure temperature by detecting thermal radiation emitted from an object, without requiring physical contact.

A pyrometer measures infrared (IR) radiation that is emitted from the object being measured without contact, while a contact thermometer measures temperature by making contact with the object being measured.

The spectral range of an infrared thermometer defines the range of wavelengths to which the instrument is sensitive.

Adjustable compression fitting are used directly on probe to achieve the required insertion length in the process and to ensure the proper sheathing of probes into thermowell. Compression fittings for attaching tubing (piping) commonly have ferrules in them. Compression fittings are popular because they do not require soldering, so they are comparatively quick and easy to use.

Nipples are made up with a flange from the same family on each end of a tube section. (Fittings that are manufactured with different flange families on each end are called hybrid adapters.) Straight nipples are manufactured with the same size flange on each end of straight section of tubing. Reducer nipples have different size flanges (from the same family) on each end.

The three piece unions have to be used in hazardous areas, for the junction between conduits pipes and boxes or various appliances. The unions are made up of three independent pieces that can be screwed up by rotating the same pieces among them.

Following are the two types of termination style:

• Metallic Plugs and Socket Connections
• Standard & Miniature Thermocouple Connectors

The link between the thermoelectric wires of the thermocouple and those of the extension cable is made by means of non – compensated male and female connectors. The metallic body and casing of these connectors ensure the screening continuity as well as good temperature.

Standard & Miniature connectors are ideal for connecting thermocouple sensors and extension or compensating cable to each other. The pins are polarized to avoid an incorrect connection and the connector body is additionally marked for polarity. These connectors have color coding according to special standard like: ANSI, IEC etc.

A thermowell is a cover that shields a temperature sensor from the process fluid. It allows for sensor insertion/removal in a safe manner while ensuring process integrity and pressure sealing.

Selecting the right Resistance Temperature Detector (RTD) depends on several factors, including process pressure, temperature range, flow velocity, insertion length, tip profile, and compatibility between the sensor and process connection.

Protection tubes shield RTDs or thermocouples from corrosion, pressure, and mechanical stress. They are installed in the process medium with the sensor remaining replaceable.

Metallic sheaths (e.g., SS, Inconel) provide high strength and corrosion protection. Non-metallic sheaths such as ceramics are used for high-temp and chemically aggressive media.

Ceramic sheaths withstand extreme temperatures and chemical attack, suitably being used for molten metals, glass, and furnace applications.

• Metallic tubes are fabricated or machined from SS, Inconel, or Monel and offer strong protection in high-velocity or high-pressure fluid systems.

• Threaded, flanged, socket weld, and Van Stone are popular, with varying advantages in installation, maintenance, and strength.

• Fabricated thermowells consist of several pieces that are welded together, ideal for low to moderate process conditions, and provide economical protection.

• Barstock thermowells are machine-turned from solid metal bars, offering exceptional mechanical strength and toughness for high-stress applications.

• Van Stone thermowells are made from a single bar with a slip-on flange, with a leak-free seal without having to weld the flange.

• Typical tip profiles are straight, tapered, stepped, and helical—each one suited to optimize response time, strength, and flow resistance.

• Thermowells are composed of a stem (shank), tip (sensing end), and process connection. They’re built to house sensors while withstanding process conditions.

• Shank construction is the shape of the stem (straight, stepped, or tapered), which influences strength and response time of the sensor.

• Types of Flange are raised face (RF), flat face (FF), and ring-type joint (RTJ), depending on pressure rating and sealing surface.

• Welding types are full penetration welds, fillet welds, and socket welds, each of which is qualified for strength and leak-tight performance.

• WPS specifies the way welding is done; PQR checks it through testing. Both ensure welds are safe and of quality.

• Special coatings such as PTFE, ceramic, or carbide resist corrosion, scaling, and abrasion in tough environments.

• Normal tests involve hydrostatic pressure tests, dye penetrant examination, radiography, material testing, and dimensional inspection.

• This checks chemical composition and mechanical properties to guarantee ASTM or ASME conformity.

• It verifies all important dimensions such as insertion length, bore, and flange alignment according to drawing specifications.

• This test places high fluid pressure on the thermowell to verify its seal and structural strength.

• DPI is a non-destructive inspection that identifies surface cracks or welding flaws by using a fluorescent or visible dye.

• Radiographic examination employs X-rays or gamma radiation to identify internal flaws or discontinuities in welds and wall thickness.

• Frequency limits, as specified by ASME PTC 19.3 TW-2010, forestall resonance and vibration-induced failure due to flow-induced turbulence.
  

• Stress on the thermowell is minimized at low velocity, enabling longer insert lengths or weaker profiles.
  

• Select the thermowell material according to the temperature range and the environment (corrosive, oxidizing etc.) in which it is to be used.
  • These wells can be made from different materials like SS304, SS316, HRS446, Inconel, Monel, Ceramic, etc.
• According to the construction of Thermowell (Steeped Shank, Straight Shank, Tapered Shank)
  • Steeped Shank- Provide faster response time and lower drag force.
  • Straight Shank- Extremely strong, but response time is slower and drag force on the fluid flow is high.
  • Tapered Shank- Provide good response time and strength.
• Thermowell Insertion Length
  • For best temperature measurement accuracy, the “U” dimension should be long enough to permit the entire temperature-sensitive part of the measuring instrument to project into the medium being measured.
    Liquid temperature measurement: One inch or greater.
    Gas temperature measurement:- three inches or greater.
• Resistance to vibration.
  • Fluid flowing past the well forms a turbulent wake (the Von Karman Trail), which has a definite frequency based on the diameter of the well and the velocity of the fluid.
  • The thermowell must have sufficient stiffness so that the wake frequency will never equal the natural frequency of the thermowell itself. If the natural frequency of the well were to coincide with the wake frequency, the well would vibrate to destruction and break off.
• To avoid the Thermowell failures caused by excessive pressure, drag forces, high temperature, corrosion, vibrations, it is recommended to run thermowell calculations based on your applications:
  • Maximum or operating temperature
  • Maximum or operating pressure
  • Fluid(gas or liquid) velocity
  • Fluid Density.

• Accessories comprise compression fittings, bushings, thermocouple connectors, gaskets, and support collars for installation and sealing.

An RTD (Resistance Temperature Detector) also known as resistance thermometer is a highly accurate temperature sensor that works by measuring electrical resistance. As temperature changes, the RTD resistance of elements (usually made of platinum) also changes in a predictable way. This change in resistance is then converted into a temperature reading.

RTD temperature sensors work on the principle that the electrical resistance of a metal increases with temperature in a predictable way. As the temperature of the metal rises, its atoms vibrate more, making it harder for electrons to pass — this increases the resistance. By measuring this change in resistance, the corresponding temperature can be accurately calculated.

An RTD Resistance Temperature Detector senses temperature by monitoring variations in the electrical resistance of a metal, usually platinum.

The RTD sensor’s operating principle relies on the fact that resistance varies with temperature in a known manner, providing accurate and stable temperature readings.

Think about parameters such as temperature range, precision, environment (vibration, chemicals), response time, and installation type. Select materials and construction based on these.

RTDs are applied to steel, pharmaceuticals, food processing, petro, HVAC, aerospace, power plants, and industrial automation for accurate temperature measurement and control.

The Callendar-Van Dusen equation is used to define RTD resistance:
R(t) = R₀(1 + At + Bt² + C(t – 100)t³), where A, B, C are constants.

Common materials are platinum (most precise), copper, nickel, and nickel-iron alloys—selected on the basis of stability, linearity, and corrosion resistance.

Platinum is highly stable and has a large range; copper is economical but low-resistance; nickel is highly sensitive but non-linear.

Platinum RTDs generally function within the range of –200°C to +850°C, whereas copper and nickel versions possess lower temperature thresholds determined by their design and materials.

IEC 751 specifies tolerances for RTD:
Class A = ±(0.15 + 0.002×t)°C;
Class B = ±(0.3 + 0.005×t)°C;
There are other classes such as 1/3, 1/5 DIN which are for greater precision.

They are high-purity platinum RTDs in accordance with ITS-90 standards and used in metrology laboratories for precise and repeatable measurements.

RTDs are made up of a sensing element (wire or film), insulators, leads, and a protective cover. They can be constructed as thin-film, coil-wound, or mineral insulated.

This form employs platinum wire wound into a helix and placed inside a ceramic tube for support, suitable for precise lab and industrial use.

Platinum wire is wound over a mandrel and glass- or ceramic-covered here, providing improved vibration resistance and moderate accuracy.

RTDs operate on 2, 3, or 4-wire configurations. Additional wires ensure the elimination of lead resistance and ensure greater accuracy in measurements.

Simple configuration in which a single lead is connected to both ends of the element. It’s easy but has the effect of lead resistance being measured, which decreases the accuracy.

It’s the most popular industrial setup; it takes care of lead wire resistance if all leads have the same resistance.

Utilized in applications requiring precision, it totally removes lead resistance effects by sensing voltage along a known current path.

RTD wiring generally adheres to color codes: two red and one white for 3-wire; two red and two white for 4-wire configurations.

These RTDs are housed in compacted MgO within a metal sheath, thereby being vibration-resistant and flexible, and suited for harsh environment use.

Typical errors are lead wire resistance, insulation breakdown, self-heating, mechanical stress, and long-term calibration drift.

Conformity guarantees standardized performance from sensors; increased conformity indicates greater interchangeability without recalibration.

Sensitivity is a measure of how much the resistance varies per degree; greater sensitivity enhances measurement resolution and signal intensity.

High insulation resistance avoids shunting errors and insures the RTD’s readings are correct and not affected by leakage currents.

Current measurement induces minor self-heating. If not relieved, it causes errors. Reduced current or improved heat removal lessens the effect.

It establishes the speed with which the RTD responds to changes in temperature. Reduced time constants allow faster response in dynamic applications.

Repeatability guarantees that the RTD delivers the same output for a given set of circumstances, essential for process control and data logging to be reliable and consistent.

Long-term resistance to drift is represented by stability. Platinum RTDs exhibit excellent stability, particularly in harsh industrial environments.

Suitable packaging facilitates heat transfer, guards the element, and maintains precision and quick response in the desired environment.

These are robust RTD assemblies contained in protective sheaths and used for direct immersion or industrial installations within a thermowell.

Probe assemblies consist of the RTD sensor, sheath, lead wires, and mounting hardware to meet process connection specifications.

Flexible RTDs are thin, flexible sensors applied in curved or irregular surfaces, offering quick response and high accuracy in confined areas.

These RTDs are engineered for custom applications like surface mounts, embedded sensors, or flexible strip form in OEM equipment.

RTDs are employed in environments such as process industries, laboratories, pharmaceuticals, aerospace, energy, and HVAC, where accurate and consistent temperature regulation is necessary.

They offer excellent accuracy, enduring stability, wide temperature range, high repeatability, making them ideal for precise temperature control applications.

RTDs are pricier than thermocouples, respond more slowly, and are less applicable at extremely high temperatures (beyond 850°C).

A thermocouple is a sensor formed by joining two dissimilar metals that generate voltage with temperature changes, based on the Seebeck Effect.

Choose the thermocouple type based on temperature range, environment (oxidizing, reducing), sensor shape, and process compatibility.

Thermocouples offer faster response and wider ranges; RTDs are more stable over time. Thermistors are limited to low temps and require complex electronics.

• Hot junctions in thermocouples are formed using TIG or laser welding to ensure conductivity and stability.

Tempsens thermocouples follow IEC 60584, ASTM E230, and ANSI MC96.1 for EMF output and material consistency.

• Thermocouples (R, S, B) are made with platinum-rhodium for high-temperature measurements where a temperature of more than 1200° is required and up to 1750°C.

• Refractory Metal Thermocouples are manufactured from exotic metals like Tungsten and Rhenium. These metals are expensive, difficult to manufacture, and brittle. These are utilized in high-temperature environments and under reducing or vacuum atmospheres, functioning at temperatures up to 2300°C.
  

   

Used in industries like:

• Steel
• Glass
• Cement
• Oil & Gas
• Power
• Petrochemical
• Nuclear & Defence
• Chemical
• Aerospace 
• Laboratories

Key traits include: 

• Quick response time
• Wide temperature range
• Compatibility with many industrial controllers and PLCs.

MI thermocouples provide:

• High flexibility
• Fast response
• High insulation resistance
• Ideal for rugged installations.

• Thermocouple uses in the steel industry are:
  • Blast Furnace
  • Annealing Furnace
  • Sinter Plants
  • Tundish
  • Billet reheating
  • Rolling mill temperature monitoring.
  • Mold Casting

Thermocouple uses in the cement industry are:

• Clinker zone 
• Pre-heaters
• Rotary kilns
• Boilers

Thermocouple uses in the pharma industry are:

• Autoclaves
• Lyophilizers
• Sterilizers
• Cleanroom validation
• Distillation Columns
• Process- Tank, boiler, reactor, dryer, granulation, distillation column, etc 

Thermocouple uses in the petrochemical industry where corrosion-resistant and high-temperature sensors are critical:

• Reactor; Fire Tube & Heat exchangers
• Reformers
• Naphtha Cracker unit 
• Pipelines
• Sulphur Recovery Unit (SRU)
• Vibrations & Bearing applications
• Fluid Catalytic Cracking unit