Campbell Scientific CR5000 CR5000 Measurement and Control Module - Page 27
Installation and Maintenance, Lead Acid Battery Wiring, TABLE 1.3-1.
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Section 1. Installation and Maintenance LEAD ACID BATTERY REPLACEMENT + 6V 7AH LEAD ACID BATTERY + 6V 7AH LEAD ACID BATTERY RED BLACK WHITE -- FIGURE 1.3-1. Lead Acid Battery Wiring Monitor the power supply using datalogger Instruction " Battery" . Incorporate this instruction into data acquisition programs to keep track of the state of the power supply. If the system voltage level consistently decreases through time, some element(s) of the charging system has failed. Battery measures the voltage at the CR5000 electronics, not the voltage of the lead acid battery. The measured voltage will normally be about 0.3 V less than the voltage at the internal or external 12 V input. This voltage drop is on account of a Schottkey diode. External power sources must be disconnected from the CR5000 to measure the actual lead acid battery voltage. TABLE 1.3-1. CR5000 Rechargeable Battery and AC Transformer Specifications Lead Acid Battery Battery Type Float Life @ 25oC Capacity Shelf Life, full charge Charge Time (AC Source) Operating temperature AC Transformer Input: Isolated Output: Yuasa NP7-6 3 years minimum 7.0 amp-hour 6 months 40 hr full charge, 20 hr 95% charge -40°C to 60°C 120 VAC, 60 Hz 18 VAC 1.2 Amp There are inherent hazards associated with the use of sealed lead acid batteries. Under normal operation, lead acid batteries generate a small amount of hydrogen gas. This gaseous by-product is generally insignificant because the hydrogen dissipates naturally before build-up to an explosive level (4%) occurs. However, if the batteries are shorted or overcharging takes place, hydrogen gas may be generated at a rate sufficient to create a hazard. Campbell Scientific recommends: 1. A CR5000 equipped with standard lead acid batteries should NEVER be used in applications requiring INTRINSICALLY SAFE equipment. 2. A lead acid battery should not be housed in a gas-tight enclosure. 1-3