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HTM128 4-20mA High Temperature Explosion-proof Temperature Transmitter

Measuring Range: -40~1500℃
Output:voltage, 4~20mA, PT100
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HTM128 explosion-proof temperature transmitter is specifically designed for use in hazardous environments where there is a risk of explosion. It supports the use of PT100, PT1000, or thermocouple sensors as the signal measurement components, offering flexibility to accommodate different temperature sensing requirements.

The transmitter features an amplification circuit housed within a robust stainless-steel shell. This circuit converts the sensor signal from the PT100, PT1000, or thermocouple into a standard signal, such as a current or voltage output. The stainless-steel shell ensures protection and integrity of the electronics in hazardous environments.

With its excellent reliability, the HTM128 transmitter is widely used for on-site temperature measurement and control in various industrial processes. It finds applications in industries such as petroleum, chemical, metallurgy, electric power, hydrology, and more, where explosive atmospheres may be present. Its adaptability, flexibility, and diversity make it a trusted solution for temperature monitoring and control in hazardous industrial settings.


On-site temperature measurement and control are crucial in various industries, including:

  • petroleum

  • chemical industry

  • metallurgy

  • electric power

  • hydrology, etc.


  • All stainless-steel housing, protection grade is IP65.

  • Reverse polarity protection and instantaneous overcurrent and overvoltage protection measures, strong anti-interference, and good long-term stability

  • High precision and good stability

  • Supports various process interfaces, easy to install and use on site.

Technical Parameters

Measuring Temperature Range


Measuring Medium

various liquid, gas, or steam compatible with 304   or 316L stainless steel



Long-term Stability


Insertion Depth


Mounting Thread


Operation Temperature

-30~70℃(normal type);      -20~60℃(Explosion-proof type)

Storage Temperature


Supply  Voltage


Output Signal

2-wire 4~20mADC,3-wire   voltage , 3-wire PT100 or RS485 etc

Protection Grade


Electrical Connection

Cable gland with terminals inside shell


ExdⅡCT6 Gb

Our product philosophy is specialization, customization, and intelligence.

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