Campbell CR1000 User Manual

9. Maintenance — Details
Related Topics:
• Maintenance — Overview (p. 93)
• Maintenance — Details
(p. 473)
• Protect the CR1000 from humidity and moisture.
• Replace the internal lithium battery periodically.
• Send to Campbell Scientific for factory calibration every three years.
9.1 Protection from Moisture — Details
Protection from Moisture — Overview (p. 93)
Protection from Moisture — Details (p. 99)
Protection from Moisture — Products (p. 660)
When humidity levels reach the dew point, condensation occurs and damage to
CR1000 electronics can result. Effective humidity control is the responsibility of
the user.
The CR1000 module is protected by a packet of silica gel desiccant, which is
installed at the factory. This packet is replaced whenever the CR1000 is repaired
at Campbell Scientific. The module should not normally be opened except to
replace the internal lithium battery.
Adequate desiccant should be placed in the instrumentation enclosure to provide
added protection.
9.2 Replacing the Internal Battery
CAUTION Fire, explosion, and severe-burn hazard. Misuse or improper
installation of the internal lithium battery can cause severe injury. Do not
recharge, disassemble, heat above 100 °C (212 °F), solder directly to the cell,
incinerate, or expose contents to water. Dispose of spent lithium batteries
properly.
The CR1000 contains a lithium battery that operates the clock and SRAM when
the CR1000 is not powered. The CR1000 does not draw power from the lithium
battery while it is fully powered by a power supply
(p. 85). In a CR1000 stored at
room temperature, the lithium battery should last approximately three years (less
at temperature extremes). In installations where the CR1000 remains powered,
the lithium cell should last much longer.
While powered from an external source, the CR1000 measures the voltage of the
lithium battery ever 24 hours. This voltage is displayed in the Status table (see the
appendix Status Table and Settings
(p. 603)) in the Lithium Battery field. A new
battery supplies approximately 3.6 Vdc. Replace the battery when voltage is
approximately 2.7 Vdc.
• When the lithium battery is removed (or is allowed to become depleted below
2.7 Vdc and CR1000 primary power is removed), the CRBasic program and
most settings are maintained, but the following are lost:
473

Campbell CR1000 Specifications

General

Brand	Campbell
Model	CR1000
Category	Measuring Instruments
Language	English