HENGKO Waterproof Grain Temperature Humidity Transmitter for Grain Storage
HENGKO HG803 SERIES
Grain Temperature Humidity Transmitter for Grain Storage
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
Why Monitor Temperature and Humidity in Grain Storage?
Grain storage conditions can vary across silos, warehouses and storage rooms. Continuous temperature and relative humidity monitoring helps operators identify environmental changes early and provides reliable data for ventilation, aeration and storage management decisions.
Detect Temperature Changes
Continuously monitor temperature conditions in grain storage environments and identify abnormal changes before they develop into larger storage problems.
Monitor Relative Humidity
Track surrounding humidity conditions that can influence grain storage stability, condensation risk and moisture migration.
Connect to Control Systems
Integrate temperature and humidity data into PLC, SCADA, data acquisition systems or grain storage monitoring networks.
Support Storage Decisions
Reliable environmental data supports better ventilation, aeration, inspection and grain storage management.
BUILT FOR INDUSTRIAL MONITORING
HG803 Key Features
● Multiple Signal Outputs
RS485 Modbus-RTU, 4–20 mA, 0–5 V and 0–10 V output options simplify integration with industrial control systems.
● Multiple Probe Designs
Standard, long, short, threaded, flanged, duct and replaceable probe configurations are available.
● Remote Probe Installation
Split-probe versions support sensor cable lengths up to 20 meters for flexible installation around grain storage facilities.
● Industrial Protection
Industrial-grade ESD protection, reverse power protection and robust probe options support demanding monitoring environments.
● Local Digital Display
The integrated display allows operators to quickly check current temperature and humidity readings on site.
● OEM / ODM Configuration
Probe structure, cable length, connection, output signal and installation configuration can be selected for your application.
CONFIGURE FOR YOUR INSTALLATION
Multiple Probe Options for Grain Storage
Grain storage facilities have different mounting depths, wall structures, monitoring points and environmental conditions. HENGKO provides several probe configurations to match different installation requirements.
| Probe Type | Typical Use | Installation Advantage |
|---|---|---|
| Standard Probe | General grain warehouse monitoring | Simple and flexible installation |
| Long Probe | Deep measurement points and wall penetration | Extends sensing point into the target area |
| Flanged Probe | Silo walls, ducts and fixed monitoring points | Secure fixed mounting |
| Threaded Probe | Threaded ports and process connections | Compact mechanical connection |
| Replaceable Probe | Applications requiring easier sensor maintenance | Probe can be replaced without replacing the complete transmitter |
Technical Specifications
HG803 configurations vary according to probe material, probe structure and selected output. Contact HENGKO for the configuration suitable for your grain storage system.
| Temperature Range | Up to -40°C to +120°C depending on probe configuration |
| Humidity Range | 0–100% RH |
| Temperature Accuracy | ±0.3°C @ 25°C; higher-accuracy options available |
| Humidity Accuracy | ±3% RH @ 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 bps; default 9600 bps |
| Supply Voltage | 10–30 V DC |
| Transmitter Operating Temperature | -20°C to +60°C |
| Transmitter Operating Humidity | 0–95% RH, non-condensing |
| Remote Probe Cable | Up to 20 m depending on configuration |
| Display | Digital temperature and relative humidity display |
FROM SENSOR TO CONTROL SYSTEM
Easy Integration into Grain Storage Monitoring Systems
HG803 can provide continuous temperature and humidity data to industrial monitoring and automation systems. RS485 Modbus-RTU enables multiple transmitters to be connected to a monitoring network, while analog outputs provide compatibility with common industrial controllers.
Typical system architecture:
HG803 Sensor → RS485 / 4–20 mA → PLC / Data Logger → SCADA / Monitoring Platform
This makes HG803 suitable for both individual storage rooms and multi-point grain storage monitoring projects.
Integration Options
✓ RS485 Modbus-RTU communication
✓ 4–20 mA industrial analog signal
✓ 0–5 V / 0–10 V output
✓ Multi-point sensor networking
✓ PLC and data logger integration
✓ Remote probe installation
APPLICATIONS
Built for Grain Storage Monitoring
Grain Silos
Environmental monitoring for grain silo storage systems.
Grain Warehouses
Continuous temperature and humidity monitoring across storage areas.
Feed Storage
Monitor environmental conditions in feed and agricultural material storage.
Seed Storage
Support stable storage conditions for seed warehouses and storage rooms.
Agricultural Storage
Temperature and RH monitoring for agricultural storage facilities.
FOR OEMs, INTEGRATORS & INDUSTRIAL PROJECTS
Configure the Transmitter for Your Grain Storage Project
Probe Configuration
Select standard, long, short, threaded, flanged, duct or replaceable probe designs.
Cable Length
Configure remote sensor cable length according to installation distance and monitoring point.
Signal Output
Choose RS485 Modbus-RTU, 4–20 mA, 0–5 V or 0–10 V according to your controller.
OEM / ODM Support
HENGKO supports application-specific configurations for equipment manufacturers and monitoring projects.
NEED HELP SELECTING A MODEL?
Tell Us About Your Grain Storage Application
For faster model selection and quotation, please provide your storage type, temperature range, required probe length, installation method, output signal and estimated quantity.
Example: Grain silo / -20 to +60°C / 1 m probe / flange mounting / RS485 Modbus / 50 units.
Grain Temperature & Humidity Transmitter FAQ
Can the HG803 be used in a grain silo?
Yes. HG803 can be configured with long, flanged, threaded or remote probes for temperature and relative humidity monitoring at suitable locations in grain silo and grain storage systems.
Does the transmitter support Modbus?
Yes. RS485 Modbus-RTU communication is available, allowing the transmitter to communicate with compatible PLCs, data loggers and monitoring systems.
Can multiple sensors be connected to one monitoring system?
RS485 configurations can support multi-device monitoring architectures. The final network design should be determined according to the controller, communication settings, cable length and site requirements.
What probe types are available?
Available configurations include standard probes, long probes, short probes, threaded probes, flanged probes, duct probes and detachable/replaceable probes.
Can HENGKO customize the probe length?
Yes. Probe structure, insertion length, cable length, mounting connection and signal output can be configured according to project requirements.
Which output should I choose: RS485 or 4–20 mA?
RS485 Modbus-RTU is useful for digital multi-point monitoring networks, while 4–20 mA is widely used for robust industrial analog transmission. The appropriate output depends on your PLC, data logger or monitoring system.
Need a Grain Storage Temperature & Humidity Monitoring Solution?
Send HENGKO your grain storage application requirements. Our team can help select the probe type, installation method, signal output and transmitter configuration for your project.
Request a Quote Contact HENGKO
Email: ka@hengko.com | sales@hengko.com
Can't find a product that meets your needs? Contact our sales staff for OEM/ODM customization services!
