14-1
Section 14. Installation and Maintenance
14.1 Protection from the Environment
The standard CR10X operates reliably from -25oC to +50oC (-55oC to +85oC,
optional). Internal moisture is eliminated by sealing the module at the factory
with a packet of silica gel inside. The desiccant is replaced whenever the CR10X
is repaired at Campbell Scientific. You should not open the module except to
replace the lithium coin cell providing backup power to the internal clock and
SRAM (see Section 14.10). Repeated disassembly/assembly of the CR10X will
degrade the seal, leading to potential moisture problems. Extra desiccant could
also be placed in the enclosure to prevent corrosion on the Wiring Panel
terminals and CR10X/CR10WP Panel connections. This preventative measure is
critical in environments with a continuously high relative humidity.
Campbell Scientific offers a range of enclosures for housing a CR10X Module,
wiring panel and peripherals. Each enclosure is constructed of glass fibre
reinforced polyester with a hinged, lockable door and the units are water-tight,
dust proof and corrosion resistant. (As supplied to Campbell Scientific, each
enclosure is classified as IP68 but this rating cannot be applied to enclosures
which are subsequently fitted with a cable gland. It is then your responsibility to
ensure that adequate sealing exists around cables entering via the gland.)
Please refer to the Enclosures Installation Manual for further information.
14.2 Power Requirements
The CR10X operates at a nominal 12V DC. Below 9.6V or above 16V the
CR10X will not operate correctly.
The CR10X is diode-protected against accidental reversal of the positive and
ground leads from the battery. Input voltages in excess of 18V may damage the
CR10X and/or power supply. A transzorb provides transient protection by
limiting the voltage at approximately 20V.
The metal surfaces of the CR10WP Wiring Panel and mounting
bracket are at the same electrical ground as the power supply.
Caution must be exercised when connecting power directly to the
Wiring Panel’s 12V and ground terminals. Connect the plus (+) side
of the supply first, keeping the minus (-) side away from the Wiring
Panel. Once the plus side is secured, connect the power return.
The 12V and switched 12V terminals on the wiring panel are not
regulated by the CR10X; they obtain power directly from the Power
In terminal. If you use the CR10X wiring panel to source power to
other 12V devices, be sure the power supply regulates the voltage
within the range acceptable to the connected device. The
maximum voltage output by a Campbell Scientific power supply is
approximately 16V (the charging voltage at –40°C).
You can estimate the battery life by dividing the battery capacity (amp-hours) by
the average system current drain. The CR10X draws <1mA in the quiescent state,
13mA while processing, and 46mA during an analogue measurement; the length
of operating time for each datalogger instruction is given in Section 3. Typical
current requirements for common CR10X peripherals are given in Table 14-1.
CAUTION
CAUTION