Hach 910, Instrument Manual

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Section 5
Page 39
Maintenance.fm
Maintenance in the Electronics Compartment
5.6 Maintenance in the Electronics Compartment
Important Note: The electronics compartment is only serviceable by a qualified
electronics technician familiar with static sensitive CMOS components. Permanent
damage to electronic circuitry may result from improper handling. Always wear a wrist
grounding strap when handling CMOS electronic components.
To open the electronics compartment, remove the four pins that hold the
electronics compartment end cap in place. The pins are located under a
protective tape on the outside surface of the logger near the end cap. The end
cap pulls straight off after all pins are removed.
5.6.1 Fuses
All internal fuses are self-resetting and require no maintenance. There are no
other user-serviceable components inside the electronics compartment
5.6.2 Memory Batteries
An internal battery pack that contains two, 1.5 V dc alkaline “C” batteries
powers RAM memory, the real time clock, and associated circuitry. The
batteries also prevent the loss of programmed settings and logged data if the
main power fails or is removed.
Model 910, 920 and 930 memory batteries are located inside the electronics
compartment. The two cells will provide many years of trouble-free operation.
Use only alkaline replacement batteries.
You can set a low memory battery indicator using InSight
®
or Vision
®
Software . See the software manual for details.