Campbell CR800 Especificaciones descargar pdf (Pagina 54)

Section 1. Installation and Maintenance

1-2

The 12 V and switched 12 V terminals on the wiring panel

are not regulated by the CR800; they obtain power directly

from the Power In terminal. If you use the CR800 wiring

panel to source power to other 12 V devices, be sure the

power supply regulates the voltage within the range

acceptable to the connected device. The maximum

voltage output by a Campbell Scientific power supply is

approximately 16 V (the charging voltage at –40°C).

1.3 Campbell Scientific Power Supplies

CR800 Power Supplies are available from Campbell Scientific with either

alkaline or lead acid batteries, the BPALK and PS100, respectively.

The CH100 contains the same circuitry as the PS100. It is used to float charge

an external 12 VDC Yuasa battery using AC or solar power. No internal

batteries are contained in the CH100. Other power supply options are

connecting a 12-volt battery directly to the CR800, Section 1.5, or supplying

power from a vehicle, Section 1.6.

Each of the power supplies has a thermal fuse in the power circuit that limits

source current. If excessive current is drawn, the fuse gets hot, increases in

resistance, and limits current. When the problem is fixed, the fuse cools and

the resistance decreases, eventually allowing current to pass. When excessive

current is drawn due to shorting the power leads to the Wiring Panel, allow 10

to 15 seconds for the fuse to cool before connecting power.

1.3.1 BPALK Alkaline Power Supply

The BPALK uses 8 alkaline D cells and comes with an AA cell battery pack to

supply power while replacing the D cells. The 4 AA batteries are not included.

To replace the batteries without stopping the datalogger program, 1) connect

the external battery to the port labeled temporary, 2) remove the old batteries,

3) replace with new alkaline D cell batteries, and 4) remove the external

battery.

A fresh set of eight alkaline D cells has 12.4 volts and a nominal rating of 7.5

amp-hours at 20°C. The amp-hour rating decreases with temperature as shown

in Table 1.3-1. The datalogger Battery instruction can be used to monitor

battery voltage. Replace the alkaline cells before the CR800 battery voltage

drops below 9.6 V.

CAUTION

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Campbell CR800 Especificaciones Pagina 54