High Temperature Humidity Transmitter 4-20mA, RS485, 0-5V, 0-10V Output, Split Long Screw Probe

Item Number:  HG808-#3 Split Short Screw Probe

HG808 Super High Temperature Humidity Transmitter

The HG808 is an industrial-grade temperature, humidity, and dew point transmitter designed for harsh environments with high temperatures. In addition to measuring and transmitting temperature and humidity, the HG808 calculates and transmits the dew point, which is the temperature at which air becomes saturated with water vapor and condensation begins to form.

Here’s a breakdown of the key features:

  • Temperature range: -40 ℃ to 190 ℃ (-40 °F to 374 °F)
  • Probe: The transmitter is equipped with a high-temperature probe that is waterproof and resistant to fine dust.
  • Output: The HG808 offers flexible output options for temperature, humidity, and dew point data:
    • Standard industrial interface RS485 digital signal
    • 4-20 mA analog output
    • Optional: 0-5v or 0-10v output
  • Display: The transmitter has an integrated display for viewing temperature, humidity, and dew point readings.
  • Connectivity: The HG808 can be connected to various industrial control systems, including:
    • On-site digital display meters
    • PLCs (Programmable Logic Controllers)
    • Frequency converters
    • Industrial control hosts

SPECIFICATION

Product Highlights:

▪Integrated design, simple and elegant
▪Industrial grade ESD safety protection and power supply anti reverse connection design
▪Using waterproof, dustproof, and high-temperature resistant probes
▪Sensitive waterproof and anti fine dust high-temperature probe
▪Standard RS485 Modbus RTU communication protocol

The ability to measure dew point makes the HG808 ideal for applications where moisture control is critical, such as:

  • HVAC systems
  • Industrial drying processes
  • Weather monitoring stations
 

By measuring and transmitting all three values (temperature, humidity, and dew point), the HG808 provides a comprehensive picture of moisture conditions in harsh environments.

HG808 Data Sheet Details

ParameterValue
Temperature range-40 ~ 190°C ( U-series) /  -50 ~ 150°C ( W-series)/ -40 ~ 150°C ( S-series)
Dew point range-60 ~ 80°C (U series ) / -60 ~ 80°C (  W-series ) / -80 ~ 80°C ( S-series )
Humidity range0 ~ 100%RH (recommended <95%RH)
Temperature accuracy±0.1°C (@20°C)
Humidity accuracy±2%RH (@20°C, 10~90%RH)
Dew point accuracy±2°C (± 3.6 °F) Td
Input and output RS485 + 4-20mA / RS485 + 0-5v / RS485 + 0-10v 
Power supplyDC 10V ~ 30V
Power consumption<0.5W
Analog signal output Humidity + Temperature / Dew point + Temperature (choose one of the two)
 4~20mA / 0-5V / 0-10V (choose one)
RS485 digital output Temperature, humidity, dew point (read simultaneously)
 Resolution: 0.01°C / 0.1°C optional
Communication baud rate1200、2400、4800、9600、19200、115200 can be set, default 9600 bps
Acquisition frequencyFastest 1s response, others can be set according to PLC
HG808 Dew Point Transmitter User Manual V1.19
Byte format8 data bits, 1 stop bit, no parity
Pressure resistance16 bar
Operating temperature– 20℃ ~ +60℃, 0%RH ~ 95%RH (non-condensing)

HG808 #3 Probe Items List

With Display Series – Standard Probe

U Series

HG808-U3Y4

HG808-U3Y5

HG808-U3Y1

W Series

HG808-W3Y4

HG808-W33Y5

HG808-W3Y1

S Series

HG808-S3Y4

HG808-S3Y5

HG808-S3Y1

Without Display Series – Standard Probe

U Series

HG808-U3N4

HG808-U3N5

HG808-U3N1

W Series

HG808-W3N4

HG808-W3N5

HG808-W3N1

S Series

HG808-S3N4

HG808-S3N5

HG808-S3N1

About Installation

4-20mA Temperature Humidity Transmitter Wire Connect Diagram

4-20mA Temperature Humidity Transmitter Wire Connect Diagram

0-10v Temperature Humidity Transmitter Wire Connect Diagram

0-10v Temperature Humidity Transmitter Wire Connect Diagram

0-5v Temperature Humidity Transmitter Wire Connect Diagram

0-5v Temperature Humidity Transmitter Wire Connect Diagram

Each color wire connect diagram HG808 Humidity Transmitter

Wiring Standard of 4-20mA + RS485 Analog Output Type

Line ColorDefinitionSpecification
Power Cord  
RedPower supply positive10 ~ 30V DC
BlackPower supply negativeGND
Analog Output Lines  
BrownTemperature signal positive4-20mA output
BlueTemperature signal negativeConnects to Black (GND)
GreyHumidity signal positive4-20mA output
WhiteHumidity signal negativeConnects to Black (GND)
RS485 Wiring  
YellowRS485ATwisted pair cable
GreenRS485BTwisted pair cable

Additional Notes:

  • Load Capacity:
    • Current output: ≤ 600Ω
    • Voltage output (not applicable in this table): ≤ 250Ω
 
  • Applicable Models: All HG808 Series
 

Important:

  • Refer to the device manual for specific connection instructions and any additional requirements.
  • Ensure proper termination resistors are used on the RS485 bus as per the device manual and relevant communication standards.
  • Do not attempt electrical wiring without proper knowledge and qualifications.
  •  

APPLICATION

High Temperature and Humidity Transmitters: 

Applications for Extreme Environments

Industrial processes often involve extreme temperatures and humidity levels. Regular transmitters can’t handle these harsh conditions. Here’s a breakdown of applications where high-temperature and humidity transmitters (operating over 200°C and down to -50°C) are crucial:

High-Temperature Applications (Over 200°C):

  • Industrial Ovens and Furnaces: Monitoring temperature and humidity is vital in curing processes like painting, drying ceramics, and heat treating metals. Precise control ensures product quality and prevents defects.
  • Power Generation: Humidity measurement in power plants helps prevent corrosion in turbines and other equipment exposed to high temperatures and steam.
  • Chemical Processing: Accurate temperature and humidity data is essential for safe and efficient chemical reactions in reactors, dryers, and pipelines. Deviations can lead to hazardous situations or product contamination.
  • Semiconductor Manufacturing: Creating microchips involves tightly controlled environments with high temperatures and low humidity. Transmitters ensure proper conditions for sensitive processes like photolithography and etching.
  • Glass Manufacturing: Glass production requires precise temperature and humidity control during melting, blowing, and annealing. Transmitters help maintain consistent glass quality and prevent defects.

Low-Temperature Applications (Down to -50°C):

  • Cold Storage Facilities: Monitoring temperature and humidity in freezers and cold warehouses helps maintain optimal conditions for food preservation and prevent spoilage.
  • Cryogenic Applications: Extremely low temperatures are used in research and industrial processes like superconductivity and liquefied natural gas (LNG) storage. Transmitters ensure safe handling and prevent equipment damage from ice formation.
  • Climate Monitoring: These transmitters are valuable tools for weather stations in extreme cold environments like the Arctic or high mountain regions. They provide accurate data for climate research and weather forecasting.
  • Aerospace Industry: Testing aircraft components for functionality in frigid conditions requires precise temperature and humidity control. Transmitters simulate real-world scenarios and ensure aircraft safety.
  • Wind Turbine Icing: Detecting and measuring ice formation on wind turbine blades is crucial for safe operation. Transmitters help prevent blade damage and power generation loss in cold climates.
 

These are just a few examples. High-temperature and humidity transmitters play a vital role in various industries by ensuring process control, product quality, and safety in extreme environments.

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