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Products Description
Product Overview
The Nexisense HG808-D dew point transmitter is a high-precision, industrial-grade device engineered forultra-low dew point monitoring in demanding low-humidity environments. It is widely deployed in compressed air systems, refrigeration, membraneand adsorption dryers, as well as high-standard sectors such as lithium battery production, electronic component manufacturing, semiconductor fabs, and power engineering environments.
Key Features
High accuracy: ±2°C dew point,±0.1°C temperature (@20°C)
Flexible outputs: Selectable 4–20mA, 0–5V, 0–10V analog or RS485 digital
Fast response: As fast as 1 second data refresh
Pressure-resilient: Supports up to16 bar pressure
Wide temp range: -40°C to +90°C operating range
Low power consumption:<0.5W, 10V-28V DC input
WorkingPrinciple
The HG808-D operates by accurately sensing both temperature and relative humidity using high-precision elements. Itcalculates dew point temperature based on these parameters. As the moisture level changes, the sensor converts this variation into analog or digitalsignals, which can be interpreted by control systems such as PLCs or SCADA systems. This mechanism ensures fast and reliabledew point detection across industrial processes requiring strict humidity control.
Structure & Design
Designed with arobust and compact structure, the HG808-D integrates advanced sensing elements and signal processing electronics in asingle unit. Key components include:
Sensor core: High-sensitivity humidityand temperature sensors
Data acquisition module: Converts environmental data into readable signals
Protective housing: Industrial-grade, pressure and temperature-resistant casing
Measurement Methods
HG808-D supports two core measurement transmission methods:
Analog Output: Outputs 4–20mA, 0–5V, or 0–10V signals for dew point and temperature values. Ideal for integration with industrial automation systems.
Digital Output: RS485 interface with Modbus RTU protocol, offering high-resolution options (0.01°C/0.1°C, 0.01%RH/0.1%RH). Best suited for precision control and data logging environments.
Technical Specifications
| Parameter | Specification |
|---|---|
| Temperature Range | -40°C to +90°C |
| Temperature Accuracy | ±0.1°C (@20°C) |
| Dew PointRange | -60°C to +90°C Td |
| Dew Point Accuracy | ±2°C (±3.6°F) Td |
| Power Supply | DC 10V to 28V |
| Power Consumption | < 0.5W |
| Analog Output | 4–20mA / 0–5V / 0–10V (one selected) |
| Digital Output | RS485 (Modbus RTU) |
| Resolution | 0.01°C / 0.1°C; 0.01%RH / 0.1%RH (configurable) |
| Baud Rate | 1200 to 115200 bps (default: 9600) |
| Sampling Rate | Min. 1 second (configurable) |
| Pressure Tolerance | Max 16 bar |
| TransmitterOperating Temp | -20°C to +60°C |
| Operating Humidity | 0%RH to 95%RH (non-condensing) |
Application Scenarios
Compressed Air Systems: Reduces moisture-related corrosion and machine failure.
Refrigeration & Drying Systems: Ensures efficient operation by monitoring dew point.
Lithium Battery Production: Maintains ultra-lowhumidity for safety and quality.
Semiconductor Manufacturing: Critical humidity control in cleanroom environments.
Electronics Production: Prevents moisture damage during PCB and component handling.
Power Equipment: Monitors ambient humidity around sensitive power components.
Conclusion
The Nexisense HG808-D Dew Point Transmitter is a professional-grade sensor that delivers reliable,accurate, and real-time dew point and temperature monitoring.Its robuststructure, multiple output options, and high precision make it an ideal solution for industries demanding strict environmental controls. Whether in high-techproduction lines or industrial drying systems, the HG808-D provides essential data to ensure operational safety, energy efficiency, andproduct quality.
