RainWise PVmet 500 Series, Руководство пользователя

Страница: 21 / 29

- 21 -
To input the correct value for the sensitivity, divide the sensitivity displayed on the solar irradiance sensor by the scale factor as shown
below.
(𝑠𝑒𝑛𝑠𝑜𝑟 𝑠𝑒𝑛𝑠𝑒𝑡𝑖𝑣𝑖𝑡𝑦) μV 𝑊𝑚
−2
⁄
𝑠𝑐𝑎𝑙𝑒 𝑓𝑎𝑐𝑡𝑜𝑟
= 𝑟𝑒𝑔𝑖𝑠𝑡𝑒𝑟 𝑣𝑎𝑙𝑢𝑒
𝐸𝑥𝑎𝑚𝑝𝑙𝑒:
5.00 μV 𝑊𝑚
−2
⁄
0.01
= 500
Some sensors have sensitivities specified in Wm
-2
/mV which must be converted to µV/Wm
-2
by inverting the sensitivity as shown
below.
(𝑠𝑒𝑛𝑠𝑜𝑟 𝑠𝑒𝑛𝑠𝑖𝑡𝑖𝑣𝑖𝑡𝑦) 𝜇𝑉 𝑊𝑚
−2
⁄ →
𝑚𝑉
((𝑠𝑒𝑛𝑠𝑜𝑟 𝑠𝑒𝑛𝑠𝑖𝑡𝑖𝑣𝑖𝑡𝑦)𝑊𝑚
−2
)
Then convert the mV to µV by multiplying by 1000.
𝑚𝑉
(𝑠𝑒𝑛𝑠𝑜𝑟 𝑠𝑒𝑛𝑠𝑖𝑡𝑖𝑣𝑖𝑡𝑦)𝑊𝑚 −2
=
1000𝜇𝑉
(𝑠𝑒𝑛𝑠𝑜𝑟 𝑠𝑒𝑛𝑠𝑖𝑡𝑖𝑣𝑖𝑡𝑦)𝑊𝑚 −2
=
1000
(𝑠𝑒𝑛𝑠𝑜𝑟 𝑠𝑒𝑛𝑠𝑖𝑡𝑖𝑣𝑖𝑡𝑦)
𝜇𝑉
𝑊𝑚
−2
⁄
𝐸𝑥𝑎𝑚𝑝𝑙𝑒: 20.00 𝑊𝑚
−2
𝑚𝑉
⁄
→
𝑚𝑉
20.00𝑊𝑚 −2
=
1000𝜇𝑉
20.00𝑊𝑚 −2
= 50 𝜇𝑉 𝑊𝑚
−2
⁄
The value put into the register for a sensor with 20.00 Wm
-2
/mV would be 50 µV/ Wm
-2
/ 0.01 = 5000.
BAUD RATE (REGISTER 205)
The PVmet-500can operate at two different baud rates, 9600 and 19200. Register characteristics are shown in Table 1.
Table 8: Device settings baud rate register
# Name Type Units Scale Factor Contents R/W Description
205 1 Baud Rate uint16 - - 9600 R/W Baud Rate, 9600 or 19200
The default baud rate is 9600. The baud rate can be optionally increased to 19,200 baud. Write either 9600 or 19200 to this register.
The baud rate change takes effect after a reboot or power cycle.
WIND SENSOR SELECTION (REGISTER 206)
The PVmet-500supports either the RainWise Miniaervane or ultrasonic wind sensor. The default selection for register 206 is a 0 which
is the RainWise Miniaervane. Writing a 1 to register 206 will enable ultrasonic wind sensor support.
Table 9: Device settings wind sensor selection register
# Name Type Units Scale Factor Contents R/W Description
206 1 Wind Sensor uint16 - - 0 R/W Wind Sensor Selector, 0 = prop, 1 = ultrasonic