Kipp&Zonen CNR 4 Net Radiometers - Manual (Page 6)

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1.1 Connecting the CNR 4
1.1.1 The difference between temperature and sensor connection
CNR 4 has several output signals: two voltages for the pyranometers, two voltages for the pyrgeometers, and two
temperature sensors as standard: a 4 wire Pt-100 connection and a 2 wire connection for the 10k thermistor.
Depending on the used data logger one of the temperature sensors can be used.
The connector with the 4 sensor outputs is indicated with an S on the back of the CNR 4, the temperature connector
is indicated with a T. The sensor connector has 8 pins and 8 wires are coming out of the cable on the other end.
The Temperature connector has also 8 pins but only 6 wires are coming out of the cable.
Exchanging the connectors will not damage the CNR 4. To prevent mix up of the cables after installation it is
advised to mark the cables with a permanent marker or tape showing also S and T.
Figure 1.1 Back of the CNR 4 with the connector for sensor outputs on the left, the temperature connector on the
right and mounting rod in the middle.
1.1.2 The radiometer Sensor connector (S)
CNR 4 sensor connector carries the signals for the two pyranometers and two pyrgeometers. The pin numbers and
wire colours are indicated in the diagram below. The shield of the cable is twisted together and covered with a black
sleeve. If the CNR 4 (rod) is grounded to the mast it is advised not to connect the shielding on the data logger side.
This might cause ground loops and offsets in the signal.