Item Number: HG808-D Dew Point Transmitter
6HG808 High Temperature Dew Point Transmitter
The HG808-D is an industrial-grade temperature, humidity, and dew point transmitter designed for harsh environments with high temperatures even over 90℃. 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:
▪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:
By measuring and transmitting all three values (temperature, humidity, and dew point), the HG808 provides a comprehensive picture of moisture conditions in harsh environments.
Here’s a specification details for the HG808-D series Dew Point Transmitter :
| Dew point range: | -60°C to +90°C |
|---|---|
| Temperature Range | -40 ~ +90°C |
| Humidity Range | 0 ~ 100% RH (Recommend < 95% RH) |
| Temperature Accuracy | ±0.1°C (@ 20°C) |
| Dew Point Accuracy | ±2% RH (± 5.4 °F) Td |
| Power Supply | DC 10V ~ 28V |
| Power Consumption | < 0.5W |
| Analog Outputs | Humidity + Temperature: 4~20mA / 0-5V / 0-10V (one out of three) |
| RS485 Digital Output | Temperature, humidity, dew point, PPM (read simultaneously) |
| Resolution Ratio | 0.01°C / 0.1°C (optional) 0.01% RH / 0.1% RH (optional) |
| Baud Rate | 1200, 2400, 4800, 9600, 19200, 115200 (default: 9600 bps) |
| Acquisition Frequency | Fastest response: 1 second; other settings per PLC |
| Byte Format | 8 data bits, 1 stop bit, no check |
| Pressurization | 16 bar |
| Working Temperature | -20°C ~ +60°C, 0% RH ~ 95% RH (Non-condensation) |
| Probe Type | Split type: Probe 0 –Split type ：0A# / 0B# Probe 8 –Split type ：8A# / 8B# |
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.
0A#
1A#
3A#
5A#
6A#
8A#
0B#
1B#
3B#
5B#
6B#
8B#
M20 Hexagonal thread stainless steel probe connector
G1/2 Hexagonal thread stainless steel probe connector
NTP1/2 Hexagonal thread stainless steel probe connector
M27 Hexagonal thread stainless steel probe connector
M20 Flange stainless steel probe connector
| Line Color | Definition | Specification |
|---|---|---|
| Power Cord | ||
| Red | Power supply positive | 10 ~ 30V DC |
| Black | Power supply negative | GND |
| Analog Output Lines | ||
| Brown | Temperature signal positive | 4-20mA output |
| Blue | Temperature signal negative | Connects to Black (GND) |
| Grey | Humidity signal positive | 4-20mA output |
| White | Humidity signal negative | Connects to Black (GND) |
| RS485 Wiring | ||
| Yellow | RS485A | Twisted pair cable |
| Green | RS485B | Twisted pair cable |
Additional Notes:
Important:
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:
Here is a structured table for the applications of high-temperature and low-temperature transmitters in extreme environments:
| Application | Description |
|---|---|
| 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. |
Would you like any adjustments or additional details?
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.
The HG808-D series is a robust dew point transmitter designed for measuring low dew point data in extremely low humidity conditions.
Key features include:
Here is a table summarizing the key features:
| Feature | Description |
|---|---|
| Reliable Measurement | Ideal for air compression, refrigeration, membrane, and adsorption dryers. |
| Versatile Installation | Can be installed in industrial applications, including: – Pipeline drying with vacuum and dry gas purification – Thermal regeneration compressed gas – Adsorption drying |
| Comprehensive Gas Monitoring | Provides accurate online measurements of moisture in various gases, including flammable, inert, and corrosive types. Useful for detecting residual humidity behind plastic industry dryers. |
| Strict Humidity Control | Essential for low dew point measurement in: – Lithium battery production – Electronic component manufacturing – Semiconductor processes – Power engineering |
| Wide Application Scope | Commonly used for humidity detection in: – Air separation nitrogen production – Dry gases, compressed gases, natural gas, and liquefied gases – High-temperature sintering furnace protective gases – Electronics industry, insulation gases, and refrigerants – Rapid trace moisture analysis in food, pharmaceuticals, and machinery |
| Broader Use Cases | Suitable for: – Meteorological analysis – Power switches – Metal smelting – Petrochemical processes – Natural gas processing – Electronic manufacturing – Textiles – Aerospace where dew point measurement is critical |
For any measurement needs not met by the HG808-D series, please reach out to our customer service for alternative temperature and humidity measurement products.
Thank you for your interest!
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