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WSS-26 -- Total Solar Radiation sensor

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1. Introduction​

WSS-26 is Total Radiation Sensor can be used to measure the total solar radiation in the spectral range of 0.3 to 3 μm (300 to 3000 nm). If the sensor face is down, the reflected radiation can be measured, and the shading ring can also be used to measure the scattered radiation.

The core device of the radiation sensor is a high-precision photosensitive element, which has good stability and high precision; at the same time, a precision-machined PTTE radiation cover is installed outside the sensing element, which effectively prevents environmental factors from affecting its performance.

1.1 Feature​

  • RS485 Total Solar Radiation sensor
  • Measure Total Radiation between 0.3 ~ 3μm(300 ~ 3000nm)
  • Measure Reflected Radiation if sense area towards ground.

1.2 Specification​

  • Input Power: DC 5 ~ 24v
  • Interface: RS485
  • Default Baud Rate (with WSC2-L host): 4800
  • Detect spectrum: 0.3 ~ 3μm(300 ~ 3000nm)
  • Measure strength range: 0 ~ 2000W/m2
  • Resolution: 0.1W/m2
  • Accuracy: ±3%
  • Yearly Stability: ≤±2%
  • Cosine response: ≤7% (@ Sun angle 10°)
  • Temperature Effect: ±2% (-10℃ ~ 40℃)
  • Working Temperature: -40℃ ~ 70℃
  • Working Humidity: 10 ~ 90%RH
  • Power Consumption: 4mA @ 12v

1.3 Wiring​

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1.4 Device Dimension​

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1.5 Installation Notice​

Do not power on while connect the cables. Double check the wiring before power on.

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1.6 Calibration Values (K-value Adjustment)​

In the event of deviations in the sensor values, calibration can be carried out by modifying the sensor's internal parameter: K-value parameter(Default: 03E8(H)=1000(D)). Calibration Principle

The K-value scales the sensor's output. If multiple sensors measure the same parameter but show different values, adjust the K-value of the secondary sensor(s) to match the primary sensor's reading.

Step-by-Step Example: Scenario:

  • Sensor 1 (reference) reads 1500.
  • Sensor 2 reads 2000, but should match Sensor 1's value (~1500).

Steps: 1. Calculate the K-value ratio:

Ratio=Desired Value/Current Value=1500/2000=0.75

Multiply by the default K-value (1000) to get the new K-value: 0.75×1000=750(Decimal)

2. Convert the [new K-value] to hexadecimal:

  • 750(D) = 0x02EE(H)

3. Send the calibration command to Sensor 2:

  • Command Format: 0B 06 00 53 [[K-value] (2 bytes)] [CRC]
  • Example for K-value 0x02EE: 0B 06 00 53 02 EE F8 5D

Notes:

  1. Always use the sensor with the most trusted reading as the reference (do not modify its K-value).

  2. The default K-value 03E8 (1000) implies no scaling. Values below 03E8 reduce the output; values above increase it.

  3. CRC is auto-generated by the tool (no manual calculation needed).

1.7 RS485 Commands​

The RS485 command is as follows: Weather_Sensors_Modbus_Command_List