Logging the Beam Fraction sensor | Delta Electronics SS1-UM-1.05

B. Logging the Beam Fraction sensor

You can log the Beam Fraction sensor in a similar manner, using the (optional) special logging cable for it. Two outputs are available, corresponding to the Total incident PAR and Diffuse PAR photodiode readings.

Be aware that the shade ring elevation may need readjustment after an hour or two. Also, that separately logged incident PAR readings cannot at present be merged with probe readings of transmitted PAR to give LAI estimates using the SunScan mathematical model.

Wiring connections

The Beam Fraction sensor logging cable plugs into the BFS cable connector, giving up to 12 metres distance from the logger. If you need more length, simply join on extra screened multicore cable of a similar type. Make sure the joint is weatherproof.

The cores of the BFS logging cable have the following functionality:

Core	Function		Logger Connection
orange	V+	Power supply positive	Sensor power positive (switched for warm-up)
green	0V	Power supply negative	Sensor power negative (0V)
brown	HI	Total PAR signal output	Input channel +, for Total PAR
	positive
grey	LO	Common signal output	Input channels - common negative
	negative
blue	HI	Diffuse PAR signal output	Input channel +, for Diffuse PAR
	positive
braid	Screen		Frame earth, or 0V

Note: the grey and green are connected internally in the BFS case. The braid is not connected to any other core.

Output

•The output signals are the Total and the Diffuse PAR irradiance.

•The millivolt outputs are linear, with a sensitivity of 1 mV = 1 ∝ mol.m-2.s-1. Maximum output is dependent on the supply voltage, and can exceed 2500 mV.

Logger requirements

•The BFS requires a voltage supply of 5-15 V dc (unregulated), at about 1 mA current.

Warning! Pre-Release Beam Fraction sensors require a regulated voltage supply of

5V dc (± 0.25 V). Refer to Delta-T if you are uncertain about this.

•Configure two logger channels for voltage input, with the above sensitivity.

•Use a "warm-up" time of 1 second (the logger must apply the power 1 second before taking its reading). Outputs will be stable after 10 ms.

SunScan User Manual v 1.05

Appendices • 75

SS1-UM-1.05 specifications

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Delta Electronics SS1-UM-1.05 user manual Logging the Beam Fraction sensor

Models: SS1-UM-1.05

B. Logging the Beam Fraction sensor

Core

SS1-UM-1.05 specifications