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Smar Temperature Transmitter
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Smar Temperature Transmitter

Smar Temperature Transmitter

The HNT40 is an ASIC-based smart temperature transmitter, available with 4–20 mA, HART and Modbus-RTU/RS485 output variants. Its measuring span covers -50 °C up to 400 °C, with reference accuracy held to ±0.5% full scale and long-term annual drift below 0.05%. Onboard surge protection is included, rated for 2000 V differential and 4000 V common-mode transient voltage. A backlit local LCD and pushbutton user interface are offered as factory options. The transmitter uses a fully sealed all-metal enclosure rated IP67 and carries Ex d IIC T6 Gb flameproof certification. Threaded and flanged process connections are both supported, allowing direct mounting to pipes, storage vessels and general process tapping points. Its thermal response time is ≤10 seconds when submerged in water flowing at 0.4 m/s.
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Hongnuo (shenyang) General Machinery Co., Ltd. is one of the most reliable manufacturers and suppliers of smar temperature transmitter in China. Welcome to buy high quality smar temperature transmitter at competitive price from our factory. We also accept customized orders.

 

 

Products Description

 

 

Parameter Specification
Probe Rod Length: 0~300 mm, customizable
Probe Diameter: φ6 / φ8 / φ10 / φ12 / φ16
Medium Temperature Range: -50 ~ +400 °C (-58 °F ~ +752 °F), customizable
Outputs: 4-20 mA (two-wire), 4-20 mA + HART (four-wire), Modbus-RTU / RS485 (four-wire)
Probe Rod Material: 316 stainless steel

 

Please see the Specifications for more details. 

>View all specifications

 

 

 

Typical Applications

 

 

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1. Temperature measurement of pipelines and tanks in process industries
Track process media temperatures inside reaction reactors, storage tanks, heat exchanger inlet and outlet ports, as well as transfer piping. The unit suits deployment across chemical, pharmaceutical, food and beverage processing facilities.

 

2. Automation systems requiring digital communication and intelligent integration
Seamlessly feed temperature readings into DCS/PLC central monitoring platforms, SCADA remote data capture systems and energy management (EMS) infrastructure.

 

3. Harsh electrical environments prone to surges and electromagnetic interference
Temperature measurement points positioned adjacent to electrical control rooms housing high densities of variable frequency drives (VFDs), alongside large motor installations, or within power distribution rooms subject to frequent switching transients.

 

 

 

 

Why Choose HNT40 ?

 
 
This transmitter offers three output options: 2-wire 4–20 mA analog, 2-wire 4–20 mA with superimposed HART digital signalling, and 4-wire Modbus-RTU over RS485. HART enables digital data transfer layered onto the analog loop, supporting remote parameter setup and device diagnostics. The RS485 port provides direct connectivity to standard industrial bus infrastructure, with a maximum cable run of 1,000 metres.
 
An integrated backlit LCD is fitted for local operation. On-site operators can toggle engineering units between °C, °F and Kelvin, tune signal damping values, and pull up active diagnostic fault codes. All fundamental configuration tasks are accessible via local pushbuttons, removing the requirement for a separate handheld communicator and cutting dependency on external commissioning hardware.
 
The unit utilises a flameproof housing. Should an internal explosion occur, flame fronts are quenched and cooled as they travel through the enclosure's flange gaps, stopping ignition of surrounding flammable atmospheres. It carries an IIC gas rating, suitable for hydrogen and acetylene service, alongside a T6 temperature class that caps the maximum external surface temperature at 85 °C. This certification satisfies installation standards for high-hazard locations including refineries and coal chemical plants.
 

 

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Key Advantages

 
  • Multi-protocol signal output
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  • Superior measurement accuracy and exceptional long-term stability
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  • Heavy-duty built-in surge protection
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  • Smart local display and on-site operational functionality
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  • Broad environmental tolerance for diverse working conditions
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  • Certified flameproof explosion-proof performance
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  • Versatile process connection options
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  • Fast dynamic response speed
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  • Low power draw with extended signal transmission distance

 

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HNT40 Smart Temperature Sensor

Specific Parameters

Value / Description

Measurement Principle

The signal transmission module employs application-specific integrated circuits (ASICs) and surface-mount packaging technology, and optionally includes a built-in LCD display module with backlight and button operation.

Application and Industry

Widely applied in industrial production, food processing and other fields

Measurement Range

-50~+400℃(-58°F ～ +752°F),Customizable

Probe Rod Length

0~300 mm, customizable

Probe Diameter

φ6/φ8/φ10/φ12/φ16

Probe Length

25mm/50mm/80mm/100mm,Customizable

Probe Rod Material

316 stainless steel

Load Impact

≤ ±0.02% of the upper limit of the range / 100Q (data referenced to full-scale output 20mA)

Environmental Temperature Impact

≤+0.005% upper limit of range/°C, reference temperature 22°C

Power Impact

≤ ±0.01% of the upper limit of the range/V, reference voltage 24V (data refers to full-scale output 20mA)

Range and Limit of Scale

-50-400°C((-58°F ～ +752°F)), minimum measuring range 100°C(212°F)
Other measurement ranges can be provided upon request. High and low limit requirements can be set: the lower limit (LRV) and upper limit (URV) values ​​are taken within the upper and lower limits of the range, with the minimum range ≤ URV - LRV | ≤ upper limit of the range.

Transmitter Housing Material

  

Connection Method

Threads/Flanges

Environmental Conditions

Operating ambient temperature range: -40-85°C; Integrated LCD display: -20-70°C
Storage ambient temperature range: -40-100°C; Integrated LCD display: -40-85°C
Operating ambient humidity range: 0-95%RH

Outputs

4-20mA (two-wire), 4-20mA+HART (four-wire), Modbus-RTU/RS485 (four-wire)

Protection Level

IP67

Power Supply

Standard: 10-30VDC
HART Communication Protocol: 16.5-55VDC, load resistance 250Ω during communication
RS485: 12-32VDC
Load Resistance: 0-211920Ω (operating state), 250-6000Ω HART communication
Transmission Distance: <1000 meters
Power Consumption: ≤500mW@24VDC, 20.8mA

Product Safety

CE certified

Functional Safety

Complies with IEC 61508 standard, allowing use in safety applications specified in IEC 61511 standard

 

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