Specifications

Section 1. Installation and Maintenance
1-5
TABLE 1.3-1. Typical Alkaline Battery
Service and Temperature
Temperature (
o
C) % of 20
o
C Service
20 - 50 100
15 98
10 94
5 90
0 86
-10 70
-20 50
-30 30
This data is based on one "D" cell under conditions of 50 mA
current drain with a 30 ohm load. As the current drain
decreases, the percent service improves for a given temperature.
1.3.2 CR3000 Lead Acid Battery Base (Part Number 10518)
Temperature range: -40° to +60°C (Table 1.3-2).
Charging voltage: 17 to 24 VDC or 18 V RMS AC.
The CR3000 includes two 6V, 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 CR3000 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 1.3-2.
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 CR3000 on or off. Battery
charging still occurs when the switch is off.
Should the lead acid batteries require replacement, consult Figure 1.3-2 for
wiring.
NOTE