Analogue Current Output; Recommended Cable Types - Kipp & Zonen SMP series Instruction Manual

2.9.4 Analogue current output

The SMP-A (current output versions) have been factory set such that an output of 4 mA represents 0 W/m² and the full-scale
output of 20 mA represents 1600 W/m².
The current output range in W/m² can be changed by the user with the supplied PC software. The maximum recommended
irradiance for the SMP3 and SMP6 are 2000 W/m² and for all other SMP's it is 4000 W/m².
Negative inputs will make the output go below 4 mA and no zero o set is needed.
For the default setting of 4 to 20 mA representing 0 to 1600 W/m², each mA represents 100 W/m².
The irradiance value ( ) for the default setting can be simply calculated as shown below.
E
solar
= Solar radiation
E
solar
mA = Output of radiometer [mA]

2.9.5 Recommended cable types

Where cables need to be extended, or the customer prefers to provide their own cables, they should be suitable for outdoor used
and UV resistant.
Recommended types
RS-485 Ethernet CAT 5 shielded twisted pair (STP)
0 to 1 V Shielded 2-core signal cable
4 to 20 mA Shielded twisted pair control cable
[W/m²]
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