Product Specification

CHT-WS Series Wall-mounted Temperature and Humidity Transmitter

The CHT-WS series wall-mounted temperature and humidity transmitter utilizes imported digital temperature and humidity sensors. Each unit is finely calibrated during production, with calibration data stored in internal memory. These transmitters offer digital output for both relative humidity and temperature, ensuring excellent interchangeability without complex calibration. They excel in measurement accuracy, linearity, repeatability, interchangeability, and consistency, making them ideal for environmental equipment integration, instrument integration, and general environmental testing.

Key Features

• High cost-performance ratio with wide voltage design.
• Digital linearization correction for high accuracy and stability.
• Full-range temperature compensation, wide temperature and humidity measurement range, with selectable measurement ranges.
• Flexible installation and convenient use.
• Compact size, lightweight, and vibration resistant.
• Available in various external shapes to meet diverse customer needs.

Applications

Widely used in building automation, telecommunication equipment rooms, papermaking, warehousing and logistics, shopping malls, hotels, cinemas, train stations, museums, theaters, agricultural greenhouses, hospitals, meteorology, clean workshops, and other fields requiring air temperature and humidity measurement.

Product Specifications

Usage Instructions

Data Conversion Methods

Temperature Conversion

• 0~2V DC: T = 50*V - 30
• 0~5V DC: T = 20*V - 30
• 0~10V DC: T = 10*V - 30
• 4~20mA: T = 6.25*A - 55

Humidity Conversion

• 0~2V DC: H = 50*V
• 0~5V DC: H = 20*V
• 0~10V DC: H = 10*V
• 4~20mA: H = 6.25*A - 25

RS485 Communication

• Protocol: Standard Modbus-RTU
• Baud Rate: 4800
• Parity Bit: None
• Data Bits: 8
• Stop Bits: 1

Modifying Address (Example: Change address from 1 to 2)

Host to Slave: 0x01 0x06 0x07 0xD0 0x00 0x02 0x08 0x86

If received correctly, the data will be returned.

Note: If the original address is forgotten, use broadcast address 0xFF. When using 0xFF, the host can only connect one slave, and the returned address will be the original address, which can be used for address querying.

Querying Data (Example: Querying temperature and humidity from address 1)

Host to Slave: 0x01 0x03 0x00 0x00 0x00 0x02 0xC4 0x0B

If received correctly, the slave will return:

Slave to Host: 0x01 0x03 0x04 0xFF 0xDD 0x01 0x64 0x5A 0x66

Temperature: -3.5 (Negative numbers are represented in two's complement)

Humidity: 35.6%RH

Important Notes

• Upon receiving the product, please check if the packaging is intact and verify that the sensor model and specifications match your order.
• Install the sensor away from chemically corrosive environments.
• Keep the sensor and wires away from high-voltage electricity, heat sources, etc.
• The sensor is a precision instrument; store it in a dry, ventilated, and normal temperature indoor environment.
• The sensor is a precision device; do not disassemble it yourself to avoid product damage.