Huidu HD-S90 Environmental Sensor – 9 Elements, RS485
$ 679.00
The Huidu HD-S90 measures wind, temperature, humidity, noise, PM2.5, PM10, pressure and light through nine sensing elements. It uses RS485 Modbus RTU and a 10–30 V DC supply. Confirm the compass configuration and integration details for the supplied unit.
999 in stock
HD-S90 nine-element environmental sensor
The Huidu HD-S90 combines nine environmental measurements in one weather-station assembly: wind speed, wind direction, temperature, humidity, noise, PM2.5, PM10, atmospheric pressure and light intensity. RS485 with Modbus RTU connects it to compatible PLCs or monitoring software.
Measurement ranges and accuracy
The following values come from the HD-S90 V1.4 specification. Accuracy conditions are retained where the document provides them; response time and measurement resolution are separate characteristics.
| Measurement | Range | Published accuracy |
|---|---|---|
| Wind speed | 0–60 m/s | The PDF prints ±(0.2 m/s ± 0.02 × v), where v is true wind speed; confirm the formula interpretation. |
| Wind direction | 0–359° | ±3° |
| Temperature | −40 to +80°C | ±0.5°C at 25°C |
| Humidity | 0–99% RH | ±3% RH at 60% RH and 25°C |
| Atmospheric pressure | 0–120 kPa | ±0.15 kPa at 25°C and 75 kPa |
| Noise | 30–120 dB | ±3 dB |
| PM2.5 | 0–1000 µg/m³; 1 µg/m³ resolution | ±10% at 25°C |
| PM10 | 0–1000 µg/m³; 1 µg/m³ resolution | ±10% at 25°C |
| Light intensity | 0–200,000 lux | ±7% at 25°C |
Power and communication specifications
| Power supply | 10–30 V DC |
|---|---|
| Maximum power consumption | 1.2 W with RS485 output |
| Output / protocol | RS485; Modbus RTU |
| Serial format | 8 data bits, no parity, 1 stop bit; CRC error checking |
| Baud rate | 2400, 4800 or 9600 bit/s; factory default 4800 bit/s |
| Device address | Factory default 0x01; devices on one bus must have unique addresses |
| Communication distance | Up to 2000 m as stated in the overview; actual bus wiring and equipment must meet installation requirements |
| Response times | Wind speed/direction: 1 s; temperature/humidity, pressure and noise: ≤1 s; PM2.5/PM10: ≤90 s; light: ≤0.1 s |
| Compass configuration | Model table distinguishes versions without compass and CP versions with built-in electronic compass |
Installation and integration
Confirm whether the unit includes the electronic compass. The manual distinguishes horizontal installation for compass-equipped units from true-north alignment for non-compass units. Its introductory compass wording should not be treated as a guarantee that every configuration includes that function.
For RS485 setup, configure one device at a time, check A/B polarity and avoid duplicate addresses. The manual includes conflicting wire-color labels and repeated labels in the register table; confirm the wiring and register mapping for the actual unit. No IP rating is stated in the linked document.
Product images
Frequently asked questions
Which nine environmental measurements does the HD-S90 provide?
It measures wind speed, wind direction, temperature, humidity, noise, PM2.5, PM10, atmospheric pressure and light intensity. Wind measurement uses an ultrasonic method.
Can the S90 connect to a PLC or monitoring computer?
Yes. It outputs RS485 using Modbus RTU. Default settings are address 0x01, 4800 bit/s, 8 data bits, no parity and one stop bit. Configure a unique address for each device on a shared bus and use the device’s verified register map.
Does every S90 include an electronic compass?
The specification’s model table distinguishes versions with and without an electronic compass. A compass-equipped version requires horizontal installation; the non-compass installation instructions require the N mark to face true north. Confirm the supplied configuration.
What power supply does the sensor need?
The technical table specifies 10–30 V DC and maximum power consumption of 1.2 W for the RS485 version. Follow the actual terminal and cable identification when wiring the unit.
What should I check if the PLC cannot read data?
The manual recommends checking COM port selection, device address, serial settings, RS485 A/B polarity and the converter driver. It also states that polling interval and response wait should both exceed 200 ms. The PDF contains inconsistent wiring-color and register labels, so verify those details for the supplied unit before implementation.
Download specifications
| Weight | 2 kg |
|---|
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