Humidity Transmitter over 95%RH Measurement for High Moisture Environment 4-20mA, RS485, 0-5V, 0-10V Output HG808-H
HG808-H High Wet Temperature Humidity Transmitter
The HG808-H by HENGKO is a high-performance industrial humidity and temperature transmitter engineered for extremely humid environments up to 98% RH. Built with durable materials and advanced sensor technology, it delivers accurate and stable measurements even in wet, steamy, or corrosive industrial settings — where typical sensors often fail.
Designed for long-term reliability, the HG808-H is the ideal solution for critical monitoring in high-moisture applications, such as:
✅ Food and beverage processing
✅ Drying chambers and industrial ovens
✅ Pharmaceutical cleanrooms
✅ Chemical and fermentation facilities
Highlights:
*Exceptional Stability Long Term Working in High Moisture / Humidity Condition
Long-term operation and lifespan in near-saturation humidity without degradation or drift.
*Precision Sensor Technology
High accuracy ±2% RH, ±0.2°C ensures reliable data for critical control systems.
*Robust Construction
Withstands harsh process environments, reducing downtime and maintenance.
*Safety & Compatibility
Built-in ESD protection, reverse polarity protection, and standard Modbus protocol ensure safe, seamless deployment.
Key Features :
New-generation design resists damage from long-term exposure to moisture-saturated environments.
Maintains accurate readings even under rapid temperature and humidity fluctuations.
✅ Wide Measurement Range
Temperature: -40°C to 190°C
Built-in algorithm to monitor and manage condensation risks.
Supports RS485 Modbus RTU, 4–20mA, and optional 0–5V / 0–10V for easy integration.
Waterproof, anti-corrosion sensor housing with sintered metal filter for dust and vapor resistance.
On-screen T/RH/Dew Point readouts available for real-time monitoring.
Easy connection with PLCs, DCS, SCADA, and building control systems.
Built-in ESD and reverse polarity protection for reliable industrial use.
Data Sheet
Specification details for the HG808-H series Humidity Transmitter :
| Category | Specification |
|---|---|
| Temperature Range | -40 ~ +100°C (or -40°F to 212°F) |
| Humidity Range | 0 ~ 100% RH (Recommend < 95% RH) |
| Temperature Accuracy | ±0.1°C (@ 20°C) |
| Humidity Accuracy | ±2% RH (@ 20°C, 10 ~ 90% RH) |
| 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 5 - Pipeline ：5A# / 5B# |
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.
Probe Option
HG808-H Series Products List and Order Number:
1.) With Display
2.) Without Display
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.
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