What is a temperature transmitter
Temperature transmitter is an instrument that converts temperature signals into standard electrical signal outputs. It is widely used in industrial automation, environmental monitoring, energy management and other fields. It can convert the temperature value detected by temperature sensors (such as thermocouples and thermal resistors) into standard signals such as 4-20mA, 0-10V, etc., which facilitates remote transmission and control system processing. The following is a detailed introduction to the temperature transmitter.
1. Core functions of temperature transmitter
The main functions of temperature transmitters include:
| Function | Description |
|---|---|
| signal conversion | Convert non-electrical signals (such as resistance, voltage) of temperature sensors into standard electrical signals |
| Linearization | Compensate non-linear temperature signals to improve measurement accuracy |
| isolation protection | Prevent interference signals from affecting the output through electrical isolation |
| remote transmission | Supports long-distance signal transmission, suitable for distributed control systems |
2. Classification of temperature transmitters
According to different application scenarios and technical characteristics, temperature transmitters can be divided into the following categories:
| Classification criteria | Type | Features |
|---|---|---|
| Sensor type | Thermocouple Transmitter | Suitable for high temperature measurement, low cost but requires cold junction compensation |
| Sensor type | Thermal resistance transmitter | High accuracy, suitable for medium and low temperature measurements |
| Installation method | Rail transmitter | Convenient for centralized installation and suitable for control cabinet integration |
| Installation method | Probe type transmitter | Install directly at the measurement point to reduce signal attenuation |
3. Technical parameters of temperature transmitter
When selecting a temperature transmitter, you need to pay attention to the following key parameters:
| parameters | Typical value | influence |
|---|---|---|
| Measuring range | -200℃~1800℃ | Decide on applicable scenarios |
| Accuracy level | 0.1%~0.5%FS | Affect measurement accuracy |
| Output signal | 4-20mA/0-10V | Determine compatibility |
| Supply voltage | 12-36VDC | Need to match the system power supply |
4. Application fields of temperature transmitter
Temperature transmitters are widely used in the following industries:
| Industry | Application scenarios | special request |
|---|---|---|
| Petrochemical industry | Reactor temperature monitoring | Explosion-proof certification required |
| Electric energy | Boiler temperature monitoring | High temperature stability |
| Food and medicine | Sterilization process control | Hygienic material |
| Environmental monitoring | Atmospheric temperature collection | Outdoor protection level |
5. Selection guide for temperature transmitters
The following factors need to be considered comprehensively when selecting:
| Considerations | Select points |
|---|---|
| Measuring medium | Corrosive media requires special material probes |
| environmental conditions | High temperature/humid environment requires higher protection level |
| System compatibility | The output signal needs to match the PLC/DCS input |
| Certification requirements | Special certification for explosion-proof, medical and other industries |
6. Future development trends of temperature transmitters
With the advancement of Industry 4.0, temperature transmitters are developing in the following directions:
1.Intelligent: Integrated self-diagnosis function and digital communication interface (such as HART protocol)
2.Wireless: Using wireless transmission technologies such as LoRa and NB-IoT
3.High precision: Improve temperature compensation accuracy through AI algorithm
4.miniaturization: Developing smaller MEMS temperature transmitters
As a key equipment for industrial temperature measurement, temperature transmitters’ technological progress will continue to promote the improvement of automation levels. The correct selection and use of temperature transmitters is of great significance to ensuring production safety and improving process control accuracy.
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