Filter
Top Products
SECTION 14. INSTALLATION AND MAINTENANCE
14-6
TABLE 14.3-2. PS12LA Battery and AC
Transformer Specifications
Lead Acid Battery
Battery Type Yuasa NA 7-12
Float Life @ 25°C 5 years typical
Capacity 7.0 amp-hour
Shelf Life, full charge Check twice yearly
Charge Time (AC Source) 40 hr full charge, 20
hr 95% charge
AC Transformer
Input: 120 VAC, 60 Hz
Isolated Output: 18 VDC @
1.11 A max.
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 makes the following
recommendations:
1. A CR10 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.
14.3.3 PS512M VOLTAGE REGULATOR WITH
NULL MODEM PORTS
The PS512M 12 Volt Lead Acid Power Supply
with Charging Regulator and Null Modem Ports
is used when 5 volts is needed to power
external modems besides the capabilities of the
PS12LA. The PS512M supplies 5 volts to pin 1
of the 9 pin null modem ports, otherwise the
capabilities and functions are identical to the
PS12LA. A common use for the PS512M is in
radiotelemetry networks. The PS12LA cannot
be modified to a PS512M.
The maximum current drain on the 5 volt supply
of the PS512M is 150 milliamps.