High Temperature Humidity Transmitter with Modbus RS485 4-20mA Output for Special High Temperature Industrial Process Environment 190℃ HG808-T
The HG808-T series is a high-precision temperature and humidity transmitter engineered for industrial high-temperature environments.
It incorporates ultra-high temperature-resistant sensors, housed in a durable cast aluminum enclosure with stainless steel components for
long-term stability and corrosion resistance.
Designed to excel in harsh conditions, this transmitter operates effectively at temperatures up to 190°C.
Key applications include high-temperature process engineering, industrial drying, combustion flue gas emissions, and environmental testing chambers.
The HG808-T can also monitor corrosive gases from petrochemical emissions and refinery processes.
For additional measurement requirements not covered by this series, please reach out to our customer service team for alternative solutions.
Key Features:
*Split/pipeline probes with excellent anti-pollution and oil resistance capabilities.
*Dual output options: RS485 digital output and two high-resolution analog outputs.
*Analog output with 15-bit resolution, and digital output with selectable 0.1 or 0.01 resolution.
*Supports single-register and multi-register reading.
*Anti-condensation function to ensure sensor performance in high humidity environments.
*Digital output provides simultaneous readings of dew point, humidity, temperature, and PPM values.
*Modbus RTU protocol for seamless integration with PLCs, DCS systems, and various configuration software.
*Wide voltage input range (10V–28V), with overcurrent protection, power polarity protection, industrial-grade ESD protection, and reverse connection safety.
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
Specification
Here’s a specification details for the HG808-T series Humidity Transmitter :
| Category | Specification |
|---|---|
| Temperature Range | -40 ~ +190°C |
| 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 3 –Split type ：3A# / 3B# Probe 5 – Pipeline ：5A# / 5B# Probe 6 – Split type ：6A# / 6B# |
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.
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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