Head Mounted Temperature Transmitter: Working, Applications & Buying Guide
A head mounted temperature transmitter is a critical industrial instrument used for accurate and stable temperature measurement. It converts low-level signals from temperature sensors such as RTDs or thermocouples into a standardized 4–20 mA output that can be transmitted reliably over long distances.
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| Head mounted temperature transmitter used for industrial RTD and thermocouple applications |
A popular industrial-grade example is the INNOVA TT-201 Head Mounted Temperature Transmitter , which is designed for accurate temperature signal conversion in demanding industrial environments.
What Is a Temperature Transmitter?
A temperature transmitter is an electronic device that takes the signal from a temperature sensor and converts it into a proportional electrical output, most commonly 4–20 mA. This standardized signal allows temperature data to be easily read by PLCs, DCS, SCADA systems, and indicators without signal degradation or electrical noise.
What Is a Head Mounted Temperature Transmitter?
A head mounted temperature transmitter is installed directly inside the sensor connection head (typically DIN Form B). Because it is mounted close to the sensor, it minimizes signal loss and interference, improving overall measurement accuracy.
Key Characteristics
- Installed inside sensor head (DIN Form B)
- Compact and space-saving design
- Excellent noise immunity
- Ideal for field and outdoor installations
How Does a Head Mounted Temperature Transmitter Work?
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| Working principle of a head mounted temperature transmitter showing RTD/thermocouple sensing and 4–20 mA signal transmission |
- The RTD or thermocouple senses the process temperature
- The transmitter receives the sensor signal
- The signal is linearized and converted into 4–20 mA
- The output is transmitted to control or monitoring systems
This method ensures stable signal transmission even in electrically noisy industrial environments.
Advantages of Head Mounted Temperature Transmitters
- Higher accuracy due to short sensor wiring
- Reduced electrical noise and interference
- Compact installation without control panel space
- Lower installation and maintenance cost
- Suitable for harsh industrial conditions
Applications of Head Mounted Temperature Transmitters
Head mounted temperature transmitters are commonly used in:
- Industrial process temperature measurement
- Power plants and substations
- Chemical and pharmaceutical industries
- Oil & gas refineries
- HVAC and building automation systems
- Boilers, furnaces, and heat exchangers
- Food and beverage processing plants
For such applications, industrial users often prefer reliable models like the INNOVA TT-201 temperature transmitter due to its compact design and stable 4–20 mA output.
Typical Technical Specifications
| Parameter | Typical Value |
|---|---|
| Input Type | RTD / Thermocouple |
| Output Signal | 4–20 mA, 2-wire |
| Accuracy | Up to 0.1% of span |
| Power Supply | 8–32 V DC |
| Operating Temperature | -40°C to +85°C |
| Mounting | DIN Form B sensor head |
| Response Time | < 500 ms |
How to Choose the Right Temperature Transmitter
- Type of sensor (RTD or thermocouple)
- Required temperature range
- Output signal (4–20 mA preferred)
- Mounting type (head or rail)
- Accuracy and response time
- Environmental conditions
Frequently Asked Questions (FAQs)
What is the purpose of a head mounted temperature transmitter?
A head mounted temperature transmitter converts RTD or thermocouple signals into a standardized 4–20 mA output and is installed directly inside the sensor head to improve accuracy and reduce signal noise.
Which is better: head mounted or rail mounted temperature transmitter?
Head mounted temperature transmitters offer higher accuracy and better noise immunity because they are mounted close to the sensor, while rail mounted transmitters are better suited for control panel installations.
Why is 4–20 mA preferred in industrial temperature measurement?
The 4–20 mA signal is resistant to electrical interference, supports long cable distances, and allows easy fault detection, making it ideal for harsh industrial environments.
Can one temperature transmitter work with both RTD and thermocouple sensors?
Yes, most modern head mounted temperature transmitters support universal inputs and can work with multiple RTD and thermocouple types.
What is DIN Form B mounting in temperature transmitters?
DIN Form B refers to the standard sensor head size in which a head mounted temperature transmitter is installed, ensuring compatibility with most industrial temperature sensors.
What industries use head mounted temperature transmitters?
They are widely used in power plants, chemical and pharmaceutical industries, oil and gas, HVAC systems, food processing, and industrial automation.
How far can a 4–20 mA temperature signal be transmitted?
A 4–20 mA signal can typically be transmitted over several hundred meters without significant signal loss, depending on cable quality and loop resistance.
Do head mounted temperature transmitters require an external power supply?
Most head mounted temperature transmitters are loop-powered devices and operate on a 8–32 V DC supply through the 4–20 mA loop.
Conclusion
A head mounted temperature transmitter offers a reliable and accurate solution for industrial temperature measurement. Its compact design, proximity to the sensor, and standardized 4–20 mA output make it the preferred choice for modern process control and automation systems.
If you are looking for a proven industrial solution, you can explore the detailed specifications and pricing of the INNOVA TT-201 Head Mounted Temperature Transmitter here .
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