Infrared Temperature Transmitter 4–20mA: Complete Guide to Non-Contact Temperature Measurement
Infrared Temperature Transmitter 4–20mA: A Complete Industrial Guide
An infrared temperature transmitter is a critical device in modern industrial automation where non-contact temperature measurement is required. Unlike traditional contact sensors such as RTDs or thermocouples, infrared transmitters measure temperature remotely and convert it into a 4–20mA signal for continuous monitoring.
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Non-contact infrared temperature transmitter used for continuous industrial temperature measurement. |
What Is a Non-Contact Temperature Transmitter?
A non-contact temperature transmitter measures the thermal radiation emitted by an object and converts it into a proportional electrical output. Because no physical contact is required, these devices are ideal for high-temperature, moving, or electrically live surfaces.
How Does an Infrared Temperature Transmitter Work?
All objects emit infrared energy based on their temperature. An IR temperature transmitter uses an optical lens to focus this radiation onto a sensor. The electronics process the signal and convert it into a stable 4–20mA analog output that can be read by PLCs, DCS, or SCADA systems.
Why 4–20mA Is the Preferred Output Signal
- Highly immune to electrical noise
- Suitable for long-distance signal transmission
- Easy fault detection (0 mA = cable break)
- Industry standard for automation systems
Infrared Temperature Transmitter vs IR Thermometer
| IR Thermometer | IR Temperature Transmitter |
|---|---|
| Handheld, spot measurement | Fixed installation, continuous measurement |
| No output signal | 4–20mA / RS485 output |
| Manual readings | PLC / SCADA integration |
| Maintenance inspections | Process automation |
Key Parameters to Consider When Selecting an IR Temperature Transmitter
1. Temperature Range
Choose a range suitable for your application. Industrial models typically cover −50°C to +300°C or higher for furnace and kiln applications.
2. Distance-to-Spot Ratio (D:S)
A higher D:S ratio (e.g., 20:1) allows accurate measurement from a safer distance, especially important in high-temperature or hazardous zones.
3. Emissivity
Most industrial infrared temperature sensors have fixed emissivity (typically 0.95), optimized for common industrial surfaces.
4. Response Time
Fast response times (500 ms or less) are essential for dynamic or moving targets.
5. Environmental Protection
An IP65 or higher rating ensures protection against dust, moisture, and harsh industrial environments.
Industrial Applications of Infrared Temperature Transmitters
- Power plants and substations
- Petrochemical and refinery processes
- Food processing and packaging lines
- Textile and paper industries
- Furnaces, kilns, and ovens
- Steel, glass, and cement plants
Why Infrared Temperature Transmitters Are Essential in Automation
With the rise of Industry 4.0, continuous temperature monitoring has become mandatory. Infrared temperature transmitters provide reliable, maintenance-free, and safe measurement in environments where contact sensors fail or degrade.
Example of an Industrial IR Temperature Transmitter
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| Kusam Meco KM-8300BX infrared temperature transmitter with 4–20mA output and IP65 stainless-steel housing. |
Frequently Asked Questions
What is the difference between an IR sensor and an IR temperature transmitter?
An IR sensor detects infrared radiation, while an IR temperature transmitter processes the signal and converts it into an industrial output such as 4–20mA.
Can infrared temperature transmitters measure moving objects?
Yes. Because the measurement is non-contact and fast, they are ideal for moving conveyors, rollers, and rotating equipment.
Are infrared temperature transmitters accurate?
Modern industrial models offer accuracy within ±1–2%, depending on emissivity, distance, and installation conditions.
Do infrared temperature transmitters require calibration?
Periodic calibration is recommended for critical processes, but they generally require far less maintenance than contact sensors.
Where should an infrared temperature transmitter be installed?
It should be installed with a clear line of sight to the target surface and within the specified distance-to-spot ratio for best accuracy.
Conclusion
An infrared temperature transmitter with 4–20mA output is the ideal solution for safe, reliable, and continuous temperature monitoring. By selecting the correct range, optics, and protection level, industries can achieve higher efficiency, safety, and process stability.
Buy Infrared Temperature Transmitter 4–20mA in India
If you are looking for a reliable non-contact infrared temperature transmitter
for industrial automation, you can explore the detailed specifications and pricing of
Kusam Meco KM-8300BX Infrared Temperature Transmitter
available at IndiaMeters.in.
If you are based in Kolkata, you may visit our offline store.
Industrial Supply Syndicate
54, Ezra Street, Kolkata - 700001
To understand differences between contact (head-mounted) and non-contact (IR) temperature transmitters, check out our head-mounted temperature transmitter guide .
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