HENGKO HG803 SERIES
Reliable temperature and relative humidity monitoring for grain silos, grain warehouses, storage rooms and agricultural storage facilities.
The HENGKO HG803 temperature and humidity transmitter provides continuous environmental monitoring with RS485 Modbus-RTU and analog output options . Multiple probe configurations are available for different grain storage installation requirements.
GRAIN STORAGE MONITORING
Temperature and relative humidity are important environmental indicators for understanding storage conditions and supporting better grain storage management.
Continuous temperature monitoring helps operators identify abnormal changes in the storage environment before they become more difficult to manage.
Track relative humidity around stored grain and provide environmental data for ventilation and storage management.
RS485 Modbus-RTU and analog signals simplify integration with PLCs, data loggers and centralized monitoring systems.
Continuous environmental data gives operators better visibility into grain storage conditions and operational changes.
HG803 TEMPERATURE & HUMIDITY TRANSMITTER
HENGKO HG803 combines temperature and relative humidity sensing with industrial signal output options in a compact transmitter. Different probe structures make it possible to adapt the sensor to silos, warehouses, ducts, storage rooms and equipment.
Wide DC power supply
Standard RS485 communication
Remote sensor cable option
Industrial protection design
MULTIPLE PROBE OPTIONS
HG803 supports multiple sensor probe structures for different mounting positions, insertion depths and grain storage environments.
Suitable for general environmental temperature and humidity monitoring where the sensing point is separated from the transmitter body.
Designed for deeper insertion into ducts, storage structures or monitoring points where extended probe length is required.
Provides a secure flange mounting solution for fixed monitoring points and equipment installations.
Threaded mounting enables convenient installation into pipelines, air ducts, equipment housings and fixed monitoring ports.
A practical probe configuration for general temperature and humidity monitoring applications.
Probe structure, mounting method, cable length and signal output can be configured according to project requirements.
TECHNICAL DATA
Specifications may vary according to probe material, probe structure and output configuration.
| Measurement | Temperature + Relative Humidity |
|---|---|
| Temperature Range | Up to -40°C to +120°C depending on probe configuration |
| Relative Humidity Range | 0–100% RH |
| Temperature Accuracy | ±0.3°C at 25°C; higher accuracy options available |
| Humidity Accuracy | ±3% RH at 60% RH, 25°C; higher accuracy options available |
| Temperature Long-Term Stability | ≤0.1°C/year |
| Humidity Long-Term Stability | ≤1% RH/year |
| Digital Output | RS485 / Modbus-RTU |
| Analog Output Options | 4–20 mA / 0–5 V / 0–10 V |
| Baud Rate | 1200 / 2400 / 4800 / 9600 / 19200 / 115200 (9600 default) |
| Power Supply | 10–30 VDC |
| Transmitter Operating Temperature | -20°C to +60°C |
| Transmitter Operating Humidity | 0–95% RH, non-condensing |
| Sensor Cable | Up to 20 m depending on configuration |
| Display | Local digital temperature and humidity display |
| Protection Design | Industrial ESD protection and reverse power protection |
SYSTEM INTEGRATION
HG803 can transmit temperature and relative humidity data to industrial monitoring and control equipment for centralized storage management.
Multiple transmitters can be deployed across grain storage facilities to create distributed environmental monitoring points. RS485 communication is particularly suitable for connecting multiple sensors to centralized industrial monitoring systems.
APPLICATIONS
Flexible probe and signal configurations allow HG803 to support different agricultural and grain storage environments.
Monitor temperature and relative humidity at selected sensing points in silo facilities.
Track environmental conditions in warehouses used for bulk grain storage.
Provide continuous environmental monitoring data for seed storage rooms and facilities.
Monitor temperature and relative humidity conditions in feed storage areas and warehouses.
OEM / ODM SENSOR SOLUTIONS
Different grain storage systems require different probe lengths, mounting methods, signal outputs and cable configurations. HENGKO supports configuration according to your monitoring system and installation requirements.
REQUEST A QUOTE
Providing the following information helps HENGKO recommend a suitable HG803 configuration faster.
Grain silo, warehouse, seed storage, feed storage, duct or other agricultural storage environment.
Required temperature range, probe length, mounting method and sensor installation position.
RS485, 4–20 mA, voltage output, required cable length and estimated project quantity.
Grain silo / -20 to +60°C / 1 m probe / flange mounting / RS485 Modbus-RTU / 50 units.
FAQ
Yes. HG803 can be configured with different probe structures, mounting methods and signal outputs for environmental temperature and relative humidity monitoring in grain silo facilities.
HG803 measures environmental temperature and relative humidity. It should not be confused with a grain moisture-content meter that directly measures moisture inside the grain itself.
HG803 supports RS485 Modbus-RTU and analog output options including 4–20 mA, 0–5 V and 0–10 V depending on the selected configuration.
RS485 Modbus-RTU can be used for multi-point sensor networks, allowing multiple monitoring points to communicate with compatible PLCs, data loggers or industrial monitoring systems.
Multiple probe structures and cable configurations are available. Contact HENGKO with your required installation depth, mounting method and monitoring environment for model selection.
Probe selection depends on the installation location, insertion depth, mounting interface, temperature range and whether the transmitter body needs to be separated from the sensing point. Flanged, threaded and remote probe configurations are available.
HENGKO TEMPERATURE & HUMIDITY SENSOR SOLUTIONS
Send us your application, temperature range, probe length, installation method, signal output and quantity. HENGKO can help select the appropriate HG803 configuration for your project.
Email: ka@hengko.com