CR300 series maintenance
Protect the data logger from humidity and moisture. When humidity levels reach the dewpoint, condensation occurs, and damage to data logger electronics can result. Adequate desiccant should be placed in instrumentation enclosure to provide protection, and control humidity. Desiccant should be changed periodically.
If sending the data logger to Campbell Scientific for calibration or repair, consult first with Campbell Scientific. If the data logger is malfunctioning, be prepared to perform some troubleshooting procedures (see Tips and troubleshooting). See: Does Your Data Logger Need to be Repaired Blog and Troubleshooting Data Acquisition System Blog .
Also, consider checking, or posting your question to, the Campbell Scientific user forum https://www.campbellsci.com/forum . Our web site www.campbellsci.com has additional manuals (with example programs), FAQs, specifications and compatibility information for all of our products.
If calibration or repair is needed, the procedure shown on: https://www.campbellsci.com/repair should be followed when sending the product.