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RTD Sensor Manufacturer in India for Accurate Industrial Temperature Measurement
Autologic Controls is a trusted RTD Sensor Manufacturer in India offering customized resistance temperature detectors for process plants, industrial machinery, autoclaves, bearings, HVAC systems and automation applications.
Our RTD sensors can be configured with PT100, PT500 or PT1000 platinum elements, 2-wire, 3-wire or 4-wire connections, Class A or Class B accuracy and process-compatible sheath materials.
Each sensor can be developed according to the operating temperature,
accuracy requirement, probe diameter, insertion length, process
connection, terminal head, cable type and installation environment.
What Is an RTD Sensor?
An RTD, or Resistance Temperature Detector, is a temperature sensor that measures the predictable change in the electrical resistance of a metal element as temperature changes.
Platinum is widely used because it offers stable, repeatable and nearly
linear resistance characteristics.
A PT100 sensor has a nominal resistance of 100 ohms at 0°C, while PT500
and PT1000 elements have nominal resistances of 500 and 1000 ohms at 0°C.
A professional RTD Sensor Manufacturer in India
helps ensure that the sensing element, accuracy class, wiring
configuration, sheath and process connection match the actual measurement
point.
Why Choose an RTD Sensor?
RTD sensors are widely selected where accuracy, repeatability and
long-term stability are more important than extremely high-temperature
capability.
- High measurement accuracy
- Good long-term stability
- Excellent repeatability
- PT100, PT500 and PT1000 element options
- Class A and Class B accuracy
- 2-wire, 3-wire and 4-wire configurations
- Simplex and duplex sensing elements
- Stainless-steel and Inconel sheath options
- Head-mounted and cable-type designs
- Customized insertion lengths
- Multiple process connections
- Compatibility with transmitters, PLCs and controllers
A project-focused RTD Sensor Manufacturer in India
can recommend a suitable construction after reviewing process temperature, cable length, required accuracy, chemical exposure and the connected instrument.
PT100, PT500 and PT1000 RTD Sensors
The element type affects resistance, sensitivity, lead-wire error and
compatibility with the connected measuring equipment.
| Parameter | PT100 | PT500 | PT1000 |
|---|---|---|---|
| Resistance at 0°C | 100 ohms | 500 ohms | 1000 ohms |
| Typical Use | Industrial process control | Selected precision applications | HVAC and long cable runs |
| Lead-Wire Influence | Higher relative effect | Moderate relative effect | Lower relative effect |
| Instrument Compatibility | Supported by most industrial instruments | Supported by compatible controllers | Common in HVAC and modern control systems |
| Common Application | Process plants, machinery and utilities | Special industrial systems | Building automation and remote measurement |
PT100 RTD Sensor
PT100 is the most widely used industrial RTD element. It is supported by most industrial temperature controllers, transmitters and PLC input
modules.
PT500 RTD Sensor
PT500 has a higher nominal resistance and may be selected where lead-wire resistance or instrument compatibility supports its use.
PT1000 RTD Sensor
PT1000 provides a greater resistance change per degree and is commonly used in HVAC, building automation and longer cable installations.
As a customized RTD Sensor Manufacturer in India,
Autologic Controls can supply the element type required by the controller,
transmitter or process specification.
2-Wire, 3-Wire and 4-Wire RTD Configurations
The number of wires influences how accurately the measuring instrument compensates for resistance in the connecting cable.
| Configuration | Measurement Accuracy | How It Works | Recommended Use |
|---|---|---|---|
| 2-Wire | Basic | Lead resistance is included in the measured resistance. | Short cable runs and non-critical monitoring. |
| 3-Wire | Good industrial accuracy |
The instrument compensates for lead resistance using the third conductor. |
Most industrial process applications. |
| 4-Wire | Highest | Separate current and voltage conductors minimize lead-wire error. | Laboratories, calibration and precision processes. |
A capable RTD Sensor Manufacturer in India
can match the wiring configuration to the cable length, accuracy
requirement and receiving instrument.
RTD Accuracy Classes
Platinum RTDs are available in different accuracy classes for general
industrial and precision applications.
| Accuracy Class | Accuracy Level | Recommended Application |
|---|---|---|
| Class B | Standard industrial tolerance | HVAC, machinery and general process monitoring. |
| Class A | Tighter measurement tolerance | Pharmaceutical, food, laboratory and precision control. |
| High-Accuracy Option | Selected precision tolerance | Calibration, validation and reference applications. |
A quality-focused RTD Sensor Manufacturer in India
should confirm the required accuracy class before selecting the sensing
element and probe construction.
Customized RTD Sensors for Industrial Applications
No two temperature-measurement points have identical mechanical,
electrical and environmental requirements.
Autologic Controls can customize:
- PT100, PT500 or PT1000 elements
- Class A or Class B accuracy
- 2-wire, 3-wire or 4-wire connections
- Simplex or duplex sensing elements
- Probe diameter
- Probe and insertion length
- SS304, SS316, SS316L or Inconel sheath
- Head-mounted or cable-type construction
- NPT or BSP threaded connections
- Compression fittings
- Flanged connections
- Sanitary fittings
- Bayonet fittings
- Spring-loaded thermowell inserts
- Weatherproof or flameproof terminal heads
- PVC, PTFE or armoured extension cables
- Special OEM configurations
Choosing an experienced
RTD Sensor Manufacturer in India
reduces the risk of ordering a sensor with the wrong element, dimensions,
connection or wiring arrangement.
Head-Type and Cable-Type RTD Sensors
Head-Type RTD Sensors
A head-type RTD includes a connection enclosure at the top of the probe.The terminal head can contain a terminal block, temperature transmitter,cable gland and earthing point.
Head-type sensors are commonly used in tanks, vessels, pipes, ducts,
reactors, heat exchangers and industrial machinery.
Cable-Type RTD Sensors
Cable-type RTDs use flexible leads between the sensing probe and the
measuring instrument.
- PVC cable
- PTFE or Teflon cable
- Fibreglass-insulated cable
- Stainless-steel braided cable
- Armoured cable
- Mineral-insulated cable
- Custom cable lengths
- Plug and socket terminations
A flexible RTD Sensor Manufacturer in India
can select the cable insulation according to ambient temperature,
moisture, abrasion and chemical exposure.
Simplex and Duplex RTD Sensors
Simplex RTD
A simplex RTD contains one sensing element and provides one
temperature-measurement signal.
Duplex RTD
A duplex RTD contains two independent sensing elements within one probe nassembly.
- Separate control and monitoring signals
- Redundant temperature measurement
- Connection to a controller and recorder
- Backup sensing
- Critical machinery protection
- Process validation
RTD Sheath Material Options
The probe sheath protects the sensing element and internal insulation
from pressure, vibration, corrosion and mechanical damage.
SS304
SS304 is suitable for many general industrial applications involving
air, water and non-aggressive process conditions.
SS316 and SS316L
SS316 and SS316L are commonly selected for pharmaceutical, food,
chemical and corrosive process environments.
Inconel 600
Inconel may be considered for elevated-temperature or demanding
oxidizing environments.
A knowledgeable RTD Sensor Manufacturer in India
should review the process medium, maximum temperature, pressure,
corrosion risk and cleaning chemicals before selecting the sheath.
Process Connection Options
- Fixed NPT threads
- Fixed BSP threads
- Adjustable compression fittings
- Flanged connections
- Sanitary tri-clamp fittings
- Bayonet connections
- Spring-loaded assemblies
- Plain insertion probes
- Thermowell-compatible inserts
- Custom mounting adaptors
The correct process connection should match the pipe, vessel, thermowell or equipment drawing.
RTD Sensor Technical Specifications
| Parameter | Available Options |
|---|---|
| Element Type | PT100, PT500 and PT1000 |
| Temperature Range | Selected according to element and probe construction |
| Accuracy Class | Class A, Class B and selected high-accuracy options |
| Wiring | 2-wire, 3-wire or 4-wire |
| Element Configuration | Simplex or duplex |
| Sheath Material | SS304, SS316, SS316L and Inconel 600 |
| Probe Diameter | Standard and customized diameters |
| Process Connection | NPT, BSP, compression, flange, bayonet or spring-loaded |
| Terminal Head | Aluminium, cast iron, stainless steel or flameproof |
| Cable Options | PVC, PTFE, armoured or mineral-insulated |
| Protection | Weatherproof and flameproof options where specified |
| Customization | Probe length, sheath, fitting, wiring, head and cable |
Specialized RTD Sensor Designs
Flameproof RTD Sensor
Flameproof RTDs are intended for specified hazardous-area installations where an approved enclosure and area classification are required.
Bearing Temperature Sensor
Bearing RTDs monitor temperature in motors, generators, turbines, pumps and rotating machinery. Rising bearing temperature can indicate
lubrication problems, overloading or mechanical wear.
Autoclave RTD Sensor
Autoclave sensors are designed for repeated steam-sterilization cycles and can use SS316L construction, sanitary fittings and high-accuracy
platinum elements.
L-Type RTD Sensor
An L-shaped sensor is useful where restricted installation space
requires the cable or terminal head to exit at an angle to the probe.
Surface RTD Sensor
Surface sensors measure the temperature of pipes, dies, machine
surfaces, rollers, bearings and heated equipment without direct
immersion.
As an application-focused RTD Sensor Manufacturer in India, Autologic Controls can develop standard and specialized designs for new equipment and replacement requirements.
RTD Sensors for Pharmaceutical and Food Applications
Pharmaceutical and food-processing systems often require accurate,
stable and repeatable temperature measurement.
- Autoclaves
- Sterilizers
- Bioreactors
- Process vessels
- WFI systems
- Pasteurizers
- Fermentation tanks
- CIP systems
- Storage vessels
- Refrigeration systems
A hygienic RTD Sensor Manufacturer in India
can configure suitable sheath materials, surface finishes, fittings and accuracy classes for the application.
RTD Sensors for Bearings, Machinery and HVAC
Bearing-temperature monitoring can help identify abnormal heat before
equipment damage develops.
- Electric motors
- Generators
- Turbines
- Pumps
- Compressors
- Gearboxes
- Fans
- Blowers
- Large rotating machinery
RTDs can also measure duct-air temperature, chilled-water temperature,hot-water temperature, air-handling-unit conditions and boiler-water temperature.
RTD Sensor vs Thermocouple
| Comparison | RTD Sensor | Thermocouple |
|---|---|---|
| Accuracy | Generally higher | Generally lower |
| Stability | Strong long-term stability | May drift more at high temperatures |
| Repeatability | Excellent | Good |
| Temperature Range | Best for low and moderate industrial temperatures | Suitable for much higher temperatures |
| Response | Usually slower | Can be faster |
| Signal | Resistance change | Millivolt output |
| Power | Requires excitation current | Self-generating |
| Typical Use | Pharma, food, HVAC and precision control | Furnaces, kilns and high-temperature processes |
Industries We Serve
- Pharmaceutical manufacturing
- Chemical-processing plants
- Food and beverage production
- Oil and gas facilities
- Power-generation plants
- HVAC and building automation
- Plastic and rubber machinery
- Textile manufacturing
- Automotive production
- Water-treatment systems
- Packaging machinery
- Laboratories
- Calibration equipment
- Boiler systems
- Pumps and rotating machinery
- Industrial automation
- OEM equipment
An established RTD Sensor Manufacturer in India
can support industrial, commercial and OEM applications with project-specific sensor configurations.
How to Select the Right RTD Sensor
- Confirm the minimum and maximum temperature
- Select PT100, PT500 or PT1000
- Choose the required accuracy class
- Select 2-wire, 3-wire or 4-wire configuration
- Choose simplex or duplex construction
- Select the sheath material
- Confirm the probe diameter
- Confirm probe and insertion length
- Select the process connection
- Choose the terminal head or cable termination
- Confirm cable length and insulation
- Review operating pressure and process medium
- Confirm area classification
- Confirm controller or transmitter compatibility
- Confirm the required quantity
A technically experienced RTD Sensor Manufacturer in India can use these details to prepare a suitable construction instead of supplying a generic sensor.
Information Required for a Quotation
- PT100, PT500 or PT1000 requirement
- Class A or Class B accuracy
- 2-wire, 3-wire or 4-wire configuration
- Simplex or duplex element
- Temperature range
- Probe diameter
- Probe and insertion length
- Sheath material
- Process connection
- Thread or flange size
- Terminal head or cable type
- Cable length
- Required weatherproof or flameproof protection
- Process pressure and medium
- Existing drawing or sample
- Quantity
- Site location
- Documentation requirements
Providing complete information helps the
RTD Sensor Manufacturer in India
prepare the correct sensor construction, dimensional details and
commercial quotation.
Why Choose Autologic Controls?
- More than 40 RTD sensor variants
- PT100, PT500 and PT1000 options
- Class A and Class B accuracy
- 2-wire, 3-wire and 4-wire configurations
- Simplex and duplex elements
- SS304, SS316, SS316L and Inconel sheaths
- Head-mounted and cable-type sensors
- Flameproof and weatherproof options
- Autoclave and bearing-temperature sensors
- Customized probe dimensions
- Multiple industrial process connections
- OEM and replacement-sensor support
- Ahmedabad-based manufacturing
- Pan-India supply
- Project-specific quotations
Request a Customized RTD Sensor
Choose an experienced RTD Sensor Manufacturer in India for a temperature sensor designed around your accuracy requirement, process temperature, probe dimensions and installation conditions.
Share your element type, wiring configuration, sheath material,
process connection, cable requirement and quantity to receive a
project-specific proposal.
Frequently Asked Questions
What is an RTD sensor and how does it work?
An RTD (Resistance Temperature Detector) is a temperature sensor that measures temperature by detecting the predictable change in electrical resistance of a metal element typically platinum as temperature changes. A PT100 RTD has exactly 100 ohms resistance at 0°C. The measuring instrument supplies a small known current, measures the resulting voltage, calculates resistance, and converts it to temperature using the IEC 60751 standard curve. RTDs are the most accurate and stable temperature sensors for industrial use in the -200°C to +600°C range.
What is the difference between PT100, PT500, and PT1000?
PT100, PT500, and PT1000 are all platinum RTDs the number refers to their resistance at 0°C. PT100 (100 ohms) is the global industrial standard, compatible with virtually all controllers and transmitters. PT500 (500 ohms) reduces lead wire resistance errors on longer cable runs. PT1000 (1000 ohms) offers the highest sensitivity at 3.85 Ω/°C and is widely used in HVAC and building automation with long wiring distances. For most industrial process control, PT100 is the correct default choice.
What is the difference between 2-wire, 3-wire, and 4-wire RTD sensors?
The wire configuration determines how accurately the instrument compensates for cable resistance error. A 2-wire RTD has no compensation lead resistance adds directly to measurement error, suitable only for very short cable runs. A 3-wire RTD allows the instrument to estimate and subtract one lead wire's resistance the standard for most industrial applications. A 4-wire RTD fully cancels all lead resistance error using separate current and voltage wires required for pharmaceutical validation, calibration, and high-precision process control.
What is the difference between Class A and Class B RTD accuracy?
Class A and Class B are the two standard accuracy grades for platinum RTDs as defined by IEC 60751. Class B (standard grade) has a tolerance of ±0.30°C at 0°C — adequate for general industrial process monitoring and HVAC. Class A (high accuracy grade) has a tolerance of ±0.15°C at 0°C — required for pharmaceutical batch processing, food production quality control, and any application where tight temperature control directly affects product quality. For most general process control, Class B is sufficient and more cost-effective.
When should I use an RTD sensor instead of a thermocouple?
Use an RTD (PT100) when accuracy and long-term stability are the priority and the temperature is below 600°C such as in pharmaceutical, food processing, HVAC, and precision process control applications. Use a thermocouple when temperature exceeds 600°C, when a faster response time is needed, or when lower cost is important. RTDs are more accurate (±0.15°C vs ±1–2°C for thermocouples) but require an external excitation current, while thermocouples are self-powered and cover a much wider temperature range up to 1750°C.