Campbell Scientific CR800 and CR850 Measurement and Control Systems - Manual (Page 36)

Section 4. Quickstart Tutorial
36
4.1.2.2 Power Supply
The CR800 is powered by a nominal 12 Vdc source. Acceptable power range is
9.6 to 16 Vdc.
External power connects through the green POWER IN on the face of the
CR800. The POWER IN connection is internally reverse-polarity protected.
4.1.2.3 Backup Battery
A lithium battery backs up the CR800 clock, program, and memory in case of
power loss. See Internal Battery
(p. 76).
4.1.3 Sensors
Most electronic sensors, whether or not manufactured or sold by Campbell
Scientific, can be interfaced to the CR800. Check for on-line content concerning
interfacing sensors at www.campbellsci.com, or contact a Campbell Scientific
applications engineer for assistance.
4.1.3.1 Analog Sensors
Analog sensors output continuous voltages that vary with the phenomena
measured. Analog sensors connect to analog terminals. Analog terminals are
configured as single-ended, wherein sensor outputs are measured with respect to
ground (figure Analog Sensor Wired to Single-ended Channel #1
(p. 36)
) or
configured as differential, wherein the high output of a sensor is measured with
respect to the low output (figure Analog Sensor Wired to Differential Channel #1
(p. 37)
). Table Single-ended and Differential Input Channels
(p. 37)
lists channel
assignments.
Figure 3: Analog sensor wired to single-ended channel #1