The Sonbest SD5190B sensor user manual provides installation, wiring, communication protocol, and configuration instructions.
The SD5190B is an LCD‑display integrated sensor that measures atmospheric pressure, temperature and humidity. It uses an industrial‑grade RS485 Modbus‑RTU interface and supports multiple output options such as RS232, CAN, 4‑20 mA, and wireless protocols.
The manual details technical specifications, wiring diagrams, typical application examples, and step‑by‑step procedures for configuring device address, baud rate, and calibration values via Modbus commands. It also includes a disclaimer and contact information for Sonbest. This manual is written in Chinese.
| Pressure measurement range | 30~110 kPa |
|---|---|
| Pressure measurement accuracy | ±0.5 % |
| Temperature measurement range | -40 °C~123.8 °C |
| Temperature measurement accuracy | ±0.5 °C @25 °C |
| Humidity measurement range | 0~100 %RH |
| Humidity measurement accuracy | ±3 %RH @25 °C |
| Communication interface | RS485 (Modbus‑RTU) |
| Default baud rate | 9600 8N1 |
| Power supply | DC 9~24 V, 1 A |
| Display type | LCD |
| Operating temperature range | -40~80 °C |
| Operating humidity range | 5~90 %RH |
Use function code 0x03 to read registers 40001 (pressure), 40002 (temperature) and 40003 (humidity). The device returns the raw 16‑bit values which must be scaled according to the documentation.