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2.
Specifications
3.
Measurement Concepts
CURS100 100 Ohm Current Shunt Terminal Input Module
100 Ohm Shunt Resistor
Tolerance @ 25 °C:
Temperature coefficient:
Power rating:
Compliance:
FIGURE 2-1. CURS100 schematic
The CURS100 has three pins: high, low, and ground. These pins have the
correct spacing to insert directly into the data logger high, low, and ground
terminals (⏚ on CR6, CR300, CR800, CR850, CR1000, CR1000X, CR3000,
CR5000, or CR9000(X)).
Transmitters having current as an output signal consist of three parts: a sensor,
a current transmitter (quite often integrated with the sensor), and a power
supply. The power supply provides the required power to the sensor and the
transmitter. The sensor signal changes with the phenomenon being measured.
The current transmitter converts the sensor signal into a current signal. This
current signal changes in a known way with the phenomenon being measured.
An advantage of current loop transmitters over voltage output transmitters is
the current signal remains constant over long wire lengths.
Current loop transmitters also have disadvantages. Most transmitters require
constant current from the power supply, adding cost and size. Also, the
conditioned output quality may not be as good as a similar unconditioned
sensor being measured directly by a data logger.
The output of the transmitter is wired so the current must flow through the 100-
ohm resistor in the CURS100.
±0.01%
±0.8 ppm / °C
0.25 W
View the EU Declaration of Conformity at
www.campbellsci.eu/curs100
2
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