HD81 Temperature, Humidity, and Carbon Dioxide Transmitter
The HD81 series controller functions as a digital controller and display unit designed for monitoring and regulating environmental parameters. It is available in various models for measuring temperature, humidity, and carbon dioxide (CO₂). Equipped with an LCD screen, relay outputs, and an RS485 communication interface (supporting the MODBUS/RTU protocol), the 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 (bps).
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 for Carbon Dioxide, Temperature, and Humidity Transmitter
Description | Specification
--- | ---
Product Series | HD81
Measurable Parameters | Temperature, Humidity, Carbon Dioxide
Power Supply | 24VDC ±10%
Communication Interface | RS485
Protocol | MODBUS/RTU
Communication Speed | 2400 – 57600 Bit/s
Parity | None/Odd/Even
Output | Up to 4 Relays
Contact Type | Normally Open
Display | LCD, 16x2 characters
Operating Temperature | -20 to +50°C
Ambient Humidity | 0 to 95%
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 Carbon Dioxide, Temperature, and Humidity Controller
The HD81 transmitter can be utilized in systems that require the measurement, display, and control of environmental conditions:
• HVAC (Heating, Ventilation, and Air Conditioning) systems
• Cleanrooms
• Pharmaceutical and laboratory facilities
• Industrial production halls
• Warehouses and cold storage facilities
• Greenhouses
• Server rooms and equipment rooms
• Monitoring systems and BMS (Building Management Systems)
• Fan and ventilation system control
• Environmental pressure and differential pressure control
In projects where multiple environmental parameters must be monitored simultaneously, the appropriate HD81 model enables both local data display and the transmission of data to a central control system.
