Campbell Scientific CR510 Basic Datalogger - Manual (Page 166)

SECTION 14. INSTALLATION AND MAINTENANCE
14-4
PS12 POWER SUPPLY
WITH 12V CHARGING REGULATOR
MADE IN USA
WARNING:
PERMANENT DAMAGE TO RECHARGEABLE
CELLS MAY RESULT IF DISCHARGED
BELOW 10.5 VOLTS
FUNCTION
INT
EXT BAT
CHG
OFF ON CHG CHG +12 +12
PS12 BATTERY
EXTERNAL BATTERY - DO NOT USE WITH
INTERNAL RECHARGEABLE BATTERY
CHARGE VOLTAGE PRESENT
INPUT FROM CHARGER OR SOLAR PANEL
16-26 VDC OR AC RMS: POSITIVE TO
EITHER TERMINAL, NEGATIVE TO OTHER
POWER TO DATALOGGER OR
12V PERIPHERALS
CR510
DIFF SE H 1 L 2 AG E1 H 3 H 4 AG E2 G 1 2 P1 G P2 G C1 C2 5V G 12V P3 G 12V
DO NO T EAT UNITED DESICCANTS-GATES 101CH RISTIN E, BEL EN, NO W MEX ICO 87 002
DESI PAK
SPECIF ICATIO N MIL-D -3464 T YPE I & II
REACT IVATIO N TIM E IN-B AG 16 H OURS A T 250 F
DESIC CANT ACTIV ATED BAGG ED FO R
CONTE NTS 4 UNITS PACKA GE US E AND S TATIC DEHUM IDIFIC ATION
DO NO T EAT UNITED DESICCANTS-GATES 101CH RISTIN E, BEL EN, NO W MEX ICO 87 002
DESI PAK
SPECIF ICATIO N MIL-D -3464 T YPE I & II
REACT IVATIO N TIM E IN-B AG 16 H OURS A T 250 F
DESIC CANT ACTIV ATED BAGG ED FO R
CONTE NTS 4 UNITS PACKA GE US E AND S TATIC DEHUM IDIFIC ATION
DO NO T EAT UNITED DESICCANTS-GATES 101CH RISTIN E, BEL EN, N EW M EXICO 87002
DESI PAK
SPECIF ICATIO N MIL-D -3464 T YPE I & II
REACT IVATIO N TIM E IN-B AG 16 H OURS A T 250 F
DESIC CANT ACTIV ATED BAGG ED FO R
CONTE NTS 4 UNITS PACKA GE US E AND S TATIC DEHUM IDIFIC ATION
DO NO T EAT UNITED D
ESICC ANTS-GATES
101CH RISTIN E, BEL EN, N EW M EXICO 87002
DESI PAK
SPECIF ICATIO N MIL-D -3464 T YPE I & II
REACT IVATIO N TIM E IN-B AG 16 H OURS A T 250 F
DESIC CANT ACTIV ATED BAGG ED FO R
CONTE NTS 4 UNITS PACKA GE US E AND S TATIC DEHUM IDIFIC ATION
O
O
FIGURE 14.3-2 PS12LA
The external port, labeled EXT, is not meant to
be used with the PS12LA unless the internal
battery is removed. The primary power source
is the charging source, and the secondary
power source is the internal lead acid battery.
Connecting a lead acid battery to the external
source is the same as connecting two lead acid
batteries in parallel, causing one battery to drop
voltage and the other to raise voltage. Alkaline
batteries connected to the external port must
have a diode in series to block charging which
would cause an explosion. (The PS12ALK
battery pack has this diode.)
Monitor the power supply using datalogger
Instruction 10. Users are strongly advised to
incorporate this instruction into their 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.
Instruction 10 measures the voltage at the 12 V
port, not the voltage of the lead acid battery.
External power sources must be disconnected
from the CR510 and charging circuit in order to
measure the actual lead acid battery voltage.
TABLE 14.3-2. PS12LA, Battery, and AC
Transformer Specifications
PS12LA
Input Voltage
16 to 26 VDC or
16 to 26 VAC RMS
Output Temperature
compensated float
charge
Maximum Battery
Capacity
24 Ahr
Temperature range
with NA 7-2 battery
-25 to +50
°
C
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 VAC @
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 CR510 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