The KTH2-E is an industrial-grade RS485 temperature and humidity acquisition module featuring DC 7–36V wide-voltage input, Modbus RTU communication, high-precision environmental monitoring, and conformal coating protection for reliable operation in industrial control cabinets and automation systems.
| Model | Sensor Structure | Probe Type | Cable Material | Communication | Supply Voltage | Protocol | Protection Features | Recommended Applications |
|---|---|---|---|---|---|---|---|---|
| KTH2-E | Integrated Sensor | Built-in | — | RS485 | DC 7-36V | Modbus RTU | Conformal Coating | Industrial Control Cabinets |
| KTH2-RI | Remote Sensor | Plastic Probe | Industrial Cable | RS485 | DC 7-36V | Modbus RTU | Conformal Coating | Industrial Equipment Monitoring |
| KTH2-RV | Remote Sensor | Ventilated Probe | Industrial Cable | RS485 | DC 7-36V | Modbus RTU | Conformal Coating | General Industrial Monitoring |
| KTH2-R-PVC | Remote Sensor | External Probe | PVC Cable | RS485 | DC 7-36V | Modbus RTU | Conformal Coating | Indoor Environmental Monitoring |
| KTH2-R-PE | Remote Sensor | External Probe | PE Cable | RS485 | DC 7-36V | Modbus RTU | Conformal Coating | Outdoor & Humid Environments |
| KTH2-R-M | Remote Sensor | Metal Probe | Industrial Cable | RS485 | DC 7-36V | Modbus RTU | Conformal Coating | Harsh Industrial Applications |
5. Application Scenarios
1. Industrial Control Cabinets
The KTH2-E continuously monitors temperature and humidity inside electrical control cabinets through the RS485 interface. The DC 7–36V wide-voltage design allows direct connection to 12V or 24V industrial power supplies, while Modbus RTU enables centralized monitoring through PLCs and SCADA systems, reducing the risk of condensation and electrical failures.
2. Power Distribution Cabinets
Power distribution equipment is vulnerable to excessive humidity and temperature rise. The KTH2-E provides accurate digital environmental monitoring and communicates reliably over RS485 networks. Its conformal-coated PCB effectively resists moisture, mold, and salt spray, extending equipment service life.
3. Factory Automation Equipment
Industrial automation systems often experience strong electromagnetic interference. The differential RS485 communication of the KTH2-E significantly improves signal integrity compared with analog sensors, ensuring stable environmental data transmission over long industrial communication cables.
4. Smart Buildings & HVAC Systems
The module integrates seamlessly into building management systems using the standard Modbus RTU protocol. Its wide operating voltage simplifies installation while enabling real-time monitoring of temperature and humidity in equipment rooms, data centers, and air-conditioning systems.
6. Technical FAQ
Q: Why does the KTH2-E use RS485 communication instead of analog voltage output?
A: RS485 adopts differential signal transmission, providing excellent immunity against electromagnetic interference commonly found in industrial environments. Combined with the Modbus RTU protocol, multiple Ebyte KTH2-E modules can communicate on the same bus, reducing wiring complexity while improving communication reliability.
Q: What advantages does the DC 7–36V operating voltage provide?
A: The wide input voltage allows the module to operate directly from standard 12V, 24V, and 36V industrial power supplies without additional DC-DC converters. This improves compatibility with PLC cabinets, automation controllers, and distributed monitoring systems while reducing installation costs.
Q: How does the conformal coating improve long-term reliability?
A: The PCB of the KTH2-E is coated with industrial-grade conformal coating that protects against moisture, mold, dust, and salt spray. This makes the module suitable for humid factories, coastal installations, electrical cabinets, and other demanding industrial environments.
Q: Can multiple KTH2-E modules share one RS485 communication bus?
A: Yes. Each module supports configurable Modbus RTU slave addresses. When proper RS485 bus topology, 120 Ω termination resistors, and communication parameters are configured correctly, multiple KTH2-E modules can operate reliably on the same industrial network.
Q: What installation considerations should engineers pay attention to?
A: To obtain the highest measurement accuracy, the module should be installed away from heat sources, high-power switching devices, and direct airflow. Proper cable routing and RS485 shielding further improve communication stability and reduce electromagnetic interference.
