Campbell CR5000, Operator'S Manual, Page: 26 / 238

Section 1. Installation and Maintenance
1-2
1.3 CR5000 Power Supplies
The CR5000 may be purchased with either a rechargeable lead acid battery or
with a low profile case without a battery.
While the CR5000 has a wide operating temperature range (-40 to +85°C
optional), the lead acid battery base is limited to -40 to +60°C. Exceeding this
range will degrade battery capacity and lifetime and could also cause
permanent damage.
1.3.1 CR5000 Lead Acid Battery BASE
Temperature range: -40° to +60°C
Charging voltage: 17 to 24 VDC or 18 V RMS AC
In normal operation a charging source should be connected to
the base at all times. The CR5000 stops measuring at ~11 V.
Battery life is shortened when discharged below 10.5 V.
The CR5000 includes a 12 V, 7.0 amp-hour lead acid battery, an AC
transformer (18 V RMS AC), and a temperature compensated charging circuit
with a charge indicating LED (Light Emitting Diode). An AC transformer or
solar panel should be connected to the base at all times. The charging source
powers the CR5000 while float charging the lead acid batteries. The internal
lead acid battery powers the datalogger if the charging source is interrupted.
The lead acid battery specifications are given in Table 1.3-1.
The leads from the charging source connect to a wiring terminal plug on the
side of the base. Polarity of the leads to the connector does not matter. A
transzorb provides transient protection to the charging circuit. A sustained
input voltage in excess of 40V will cause the transzorb to limit voltage.
The red light (LED) on the base is on during charging with 17 to 24 VDC or
18 V RMS AC. The switch turns power to the CR5000 on or off. Battery
charging still occurs when the switch is off.
Should the lead acid batteries require replacement, consult Figure 1.3-1 for
wiring.
NOTE