HD81 Temperature and Humidity Transmitter:
The HD81 series controller is a digital controller and display unit designed for monitoring and controlling environmental parameters; it is available in various models for measuring temperature and humidity. Equipped with an LCD screen, relay outputs, and an RS485 communication interface (supporting the MODBUS/RTU protocol), this device is well-suited for integration into control and monitoring systems.
Capabilities of the HD81 Controller: A key feature of this controller is its ability to connect to monitoring and automation systems via an RS485 port. The device’s serial communication supports the MODBUS/RTU protocol, with a configurable data transmission speed ranging from 2,400 to 57,600 bits per second.
The HD81 controller features a 16×2 character LCD screen that displays measured values. This allows for the immediate viewing of environmental parameters and the device's operational status, without the need for a connection to an external monitoring system. Technical Specifications of the HD81 Temperature and Humidity Transmitter
Description | Specification
--- | ---
HD81 | Product Series
Temperature, Humidity | Measurable Parameters
24VDC ±10% | Power Supply
RS485 | Communication Interface
MODBUS/RTU | Protocol
2400 – 57600 Bit/s | Communication Speed
None/Odd/Even | Parity
Up to 4 Relays | Output
Normally Open | Contact Type
LCD, 16×2 Characters | Display
-20 to +50°C | Operating Temperature
0 to 95% | Ambient Humidity
Note: Precise specifications regarding measurement ranges, the number of relays, and measurable parameters should be verified based on the specific HD81 model selected.
Applications of the HD81 Temperature and Humidity Transmitter
The HD81 controller can be utilized in systems that require the measurement, display, and control of environmental conditions, including: • HVAC (Heating, Ventilation, and Air Conditioning) systems • Cleanrooms • Pharmaceutical and laboratory facilities • Industrial production halls • Warehouses and cold storage • Greenhouses • Server rooms and equipment rooms • Monitoring systems and BMS (Building Management Systems) • Fan and ventilation control • Environmental pressure and differential pressure control.
In projects where multiple environmental parameters must be monitored simultaneously, the appropriate HD81 model enables both the local display of information and the transmission of data to a central control system.
