Differences from BF2 and BF3
•
The BF2 and BF3 use the same optical design as the SPN1, and
have a similar set of outputs. The BF2 & BF3 use photodiodes rather
than thermopile sensors and measure PAR rather than energy. They
are not as rugged or as accurate as the SPN1.
Construction
Seven thermopile sensors are mounted under cosine-corrected diffusers,
all under a patterned, hemispherical dome, along with a levelling bubble, a
desiccant-status indicator, and a red light emitting diode (LED). The LED
flashes when the SPN1 is taking readings.
There are two external connectors, a 5-pin RS232 connector for serial
communications, and an 8-pin connector for analogue signals and power.
The serial port is provided for checking real time readings, using the
SunRead software, or for attachment to digital data collection systems.
See also Appendix B: RS232 commands
The desiccant can be renewed by unscrewing the indicator plug from the
side of the SPN1 and replacing the canister.
A fully adjustable levelling baseplate is also available.
Section through SPN1
6
z
Introduction
SPN1 User Manual v1.0
