Industrial High-Precision ±1.5% RH Temperature and Humidity Transmitter with Stable Performance, 4-20mA, RS485, 0-5V, and 0-10V Outputs, Integrated Hex Screw Duct Probe

Item Number:  HG808-C  Series

HG808 Stable Industrial  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 150 ℃ (-40 °F to 302 °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.

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HG808 Data Sheet Details

Here’s a specification details for the HG808-C series Humidity Transmitter :

CategorySpecification
Temperature Range-50 ~ +150°C (-40 °F to 302 °F)
Humidity Range0 ~ 100% RH (Recommend < 95% RH)
Temperature Accuracy±0.1°C (@ 20°C)
Humidity Accuracy±1.5% RH (@ 20°C, 10 ~ 90% RH)
Power SupplyDC 10V ~ 28V
Power Consumption< 0.5W
Analog OutputsHumidity + Temperature:
4~20mA / 0-5V / 0-10V (one out of three)
RS485 Digital OutputTemperature, humidity, dew point, PPM (read simultaneously)
Resolution Ratio0.01°C / 0.1°C (optional) 
0.01% RH / 0.1% RH (optional) 
Baud Rate1200, 2400, 4800, 9600, 19200, 115200 (default: 9600 bps)
Acquisition FrequencyFastest response: 1 second; other settings per PLC
Byte Format8 data bits, 1 stop bit, no check
Pressurization16 bar
Working Temperature-20°C ~ +60°C, 0% RH ~ 95% RH (Non-condensation)
Probe Type

Split type:
Probe 0 –Split type  :0A# / 0B#

Probe 1 –Split type  :1A# / 1B#
Probe 3 – Pipeline :3A# / 3B#

Probe 5 – Pipeline :5A# / 5B#

HG808 #3 Probe Items List

We offer 6 types of probes for the HG808 Humidity Transmitter, with each type available in both A and B versions, providing a total of 12 probes for various application options.

A-Series Humidity Probe

A type Porous stainless steel humidity probe

0A#

#A1 Humidity Probe For Humidity Transmitter

1A#

#A3 Humidity Probe For Humidity Transmitter

3A#

#A5 Humidity Probe For Humidity Transmitter

5A#

#A6 Humidity Probe For Humidity Transmitter

6A#

#A8 Humidity Probe For Humidity Transmitter

8A#

B-Series Humidity Probe

B type stainless steel humidity probe

0B#

#B1 Humidity Probe For Humidity Transmitter

1B#

3B#

5B#

6B#

8B#

Probe Connector

Probe Connector Option
M20 Hexagonal thread stainless steel humidity probe

M20 Hexagonal thread stainless steel probe connector

G1/2 Hexagonal thread stainless steel humidity probe

G1/2 Hexagonal thread stainless steel probe connector

NTP1/2 Hexagonal thread stainless steel humidity probe

NTP1/2 Hexagonal thread stainless steel probe connector

M27 Hexagonal thread stainless steel humidity probe

M27 Hexagonal thread stainless steel probe connector

M20 Flange stainless steel humidity probe

M20 Flange stainless steel probe connector

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.

Download Product Manual / Certification / Software

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Product Introduction

1.1 Product Overview

The HG808-C series temperature and humidity transmitter features a high-precision, long-lasting humidity sensor probe with an accuracy of ±1.5% RH, making it ideal for measuring temperature and humidity in harsh industrial settings, with a range of -50°C to +150°C. This series is designed for dust-free and clean temperature and humidity measurements, providing superior protection and control, making it perfect for clean room applications. It is widely utilized in environments such as electronic and pharmaceutical clean rooms, hospital operating rooms, and more. The HG808-C series is suitable for various sectors, including pharmaceuticals, chemicals, industrial painting, automation systems, HVAC, agriculture, and quality control, all requiring stringent temperature and humidity regulation. If the HG808-C series does not meet your measurement needs, please contact our customer service for other temperature and humidity measurement options. Thank you for your interest!

1.2 Function Features

  • Split/pipeline type probes with excellent anti-pollution and oil resistance.
  • Supports RS485 output and two analog outputs simultaneously.
  • Analog output provides 15-bit high resolution; digital output offers optional resolutions of 0.1 or 0.01.
  • Capable of single and multi-register reading.
  • Anti-condensation function ensures sensor stability in high humidity conditions.
  • Digital output can read dew point, humidity, temperature, and PPM values concurrently.
  • Utilizes the standard Modbus RTU protocol for easy integration with PLCs, DCS, and various configuration software.
  • Features an ultra-wide voltage input (10V-28V), overcurrent protection, power polarity protection, industrial-grade ESD safety, and reverse polarity protection.

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