Industrial Dew Point Sensor Transmitter for Compressed Air Drying Systems with Display HG602
Industrial Dew Point Sensor Transmitter for Compressed Air Drying Systems with Display HG602
The HENGKO HG602 is an industrial dew point sensor transmitter designed for continuous monitoring of compressed air dryers, desiccant drying systems, dehumidification equipment and other low-humidity industrial processes.
It combines dew point, temperature and relative humidity measurement with a local display and multiple industrial signal outputs, allowing operators to view conditions directly while transmitting measurement data to PLC, HMI, DCS or remote monitoring systems.
Dew point range: −60 to +60°C Td
Measured parameters: Dew point, temperature and relative humidity
Output options: RS485 Modbus RTU, 4–20 mA, 0–5 V or 0–10 V
Local indication: Integrated real-time display
Typical use: Compressed air dryers, drying rooms and industrial dehumidification systems
Why Monitor Dew Point in Compressed Air Systems?
Dew point monitoring helps operators verify dryer performance, detect moisture breakthrough and protect downstream pneumatic equipment, instruments and production processes.
Verify Dryer Performance
Continuously confirm whether refrigerated, membrane or desiccant air dryers are achieving the required outlet dew point.
Detect Moisture Breakthrough
Identify rising moisture levels caused by saturated desiccant, dryer faults, leaks, bypass conditions or insufficient regeneration.
Protect Downstream Equipment
Reduce moisture-related corrosion, freezing, contamination and malfunction in pneumatic tools, valves and process instruments.
Support Process Quality
Maintain controlled moisture levels for production processes where compressed-air dryness directly affects product consistency.
Enable Preventive Maintenance
Use dew point trends to plan desiccant replacement, dryer servicing and filter maintenance before process failures occur.
Integrate With Automation
Transmit real-time data to industrial control systems for alarms, trend analysis, interlocks and remote supervision.
HG602 Key Features
Designed for continuous industrial measurement, local observation and convenient integration into existing monitoring and control systems.
Wide Dew Point Measurement Range
Measures dew point from −60 to +60°C Td for compressed air drying, dehumidification and general industrial humidity monitoring.
Integrated Local Display
Allows maintenance personnel and operators to check dew point, temperature and humidity directly at the measurement point.
Multiple Industrial Outputs
Optional RS485 Modbus RTU, 4–20 mA, 0–5 V and 0–10 V signals simplify connection to PLC, HMI, DCS and data acquisition systems.
Stainless Steel Housing
The compact metal enclosure provides mechanical protection and corrosion resistance for long-term industrial installation.
Fast Measurement Response
A typical response time of approximately 10 seconds at 1 m/s airflow supports timely detection of changing moisture conditions.
Flexible Power Supply
Wide-voltage DC power input supports integration into common industrial control cabinets and monitoring installations.
HG602 Technical Specifications
Confirm the required signal output, connection configuration and operating pressure before ordering.
| Parameter | HG602 Specification |
|---|---|
| Measured Parameters | Dew point, temperature and relative humidity |
| Dew Point Range | −60 to +60°C Td / −76 to +140°F Td |
| Relative Humidity Range | 0–100% RH |
| Temperature Accuracy | ±0.1°C under specified operating and calibration conditions |
| Humidity Accuracy | Refer to the selected sensor configuration and calibration specification |
| Typical Response Time | Approximately 10 seconds at 1 m/s airflow |
| Power Supply | DC 10–28 V |
| Power Consumption | Less than 0.1 W |
| Digital Output | RS485 Modbus RTU, optional |
| Analog Output | 4–20 mA, 0–5 V or 0–10 V, optional according to configuration |
| Output Load | 4–20 mA: RL ≤500 Ω; voltage output: RL ≥10 kΩ |
| Baud Rate | 1200, 2400, 4800, 9600, 19200 or 115200 bps; default 9600 bps |
| Communication Format | 8 data bits, 1 stop bit, no parity |
| Data Logging | Up to 65,000 records with compatible Smart Logger data management and analysis software |
| Long-Term Stability | Humidity: less than 1% RH per year; temperature: less than 0.1°C per year |
Industrial Control System Integration
HG602 can operate as a local indicating instrument or as part of a centralized compressed-air quality monitoring and automation system.
PLC
Connect digital or analog measurement signals to a programmable logic controller.
HMI
Display real-time dew point values, trends and alarm conditions on the operator interface.
DCS or SCADA
Transmit measurement data to plant-wide monitoring, process control or supervisory systems.
Data Logger
Record operating history for maintenance analysis, process validation and quality documentation.
Probe Installation and Sampling Arrangement
Correct installation is essential for obtaining representative and stable dew point measurements.
Direct Pipeline Installation
Install the probe at a representative point with suitable pressure rating, sealing and protection from liquid water or heavy contamination.
Bypass Sampling Chamber
Use a controlled sample flow where the main-line pressure, velocity, temperature or maintenance requirements make direct installation unsuitable.
Install After the Dryer
For dryer performance monitoring, install downstream of the dryer and upstream of moisture-sensitive production equipment.
Avoid Condensation
Prevent liquid water, oil aerosol and severe particulate contamination from reaching the sensing area.
Typical Applications
Suitable for industrial processes where moisture control, dryer verification and reliable environmental monitoring are required.
Compressed Air Dryers
Outlet dew point monitoring for refrigerated, desiccant and membrane compressed-air drying systems.
Drying Rooms
Continuous low-humidity monitoring in controlled drying rooms and dehumidification areas.
Semiconductor Manufacturing
Moisture monitoring for clean dry air, process gas support and controlled production environments.
Pharmaceutical Production
Monitoring of compressed air and controlled humidity conditions in compatible pharmaceutical processes.
Instrument Air Systems
Protect pneumatic actuators, control valves and instrumentation from moisture-related problems.
Plastic Drying
Monitor drying-air quality in resin, pellet and polymer material drying processes.
Food Processing
Humidity and compressed-air dryness monitoring in compatible food production and packaging systems.
Environmental Chambers
Dew point, temperature and humidity monitoring for test chambers and environmental control equipment.
Information Required for Model Selection
Provide the following details so that the correct HG602 signal, probe and installation configuration can be confirmed.
1. Measurement Medium
Compressed air, process gas or environmental air, including any oil, particles or corrosive contaminants.
2. Expected Dew Point
Normal operating dew point, alarm threshold and the lowest expected measurement value.
3. Pressure and Temperature
Pipeline pressure, gas temperature, ambient temperature and whether a bypass sampling system will be used.
4. Required Output
RS485 Modbus RTU, 4–20 mA, 0–5 V or 0–10 V, together with the required power supply.
5. Mechanical Installation
Thread type, insertion arrangement, cable requirement, mounting location and available installation space.
6. Control System
PLC, HMI, DCS, SCADA, data logger or independent local display application.
OEM, Manufacturing and Quality Support
HENGKO supports industrial sensor integration projects with configurable outputs, protective probe structures and application-oriented technical assistance.
Need to Monitor Dew Point in Your Compressed Air System?
Send us your expected dew point range, pipeline pressure, gas temperature, required output signal, mechanical connection and installation drawing. Our engineering team will help confirm the appropriate HG602 configuration.
Request Technical Support & Quotation
Application Review · Signal Configuration · Installation Support · OEM Supply
