Hach 900 MAX Manual De Usuario

8990mnt.fm

Random Access Memory (RAM) is a very reliable data storage medium for 
microprocessor applications. However, RAM requires power at all times. If 
power is removed, the data stored in the RAM chip is lost. Therefore, RAM 
chips cannot be powered from the sampler power supply because data and 
program settings would be lost every time the power cord was unplugged. A 
separate battery located inside the sampler controller is provided to power the 
RAM chips and the real-time clock. The memory battery keeps the program 
entries and logged sample data alive inside the RAM memory when the main 
power fails or is removed for transport or replacement.

The sampler memory battery consists of two “C” cell alkaline batteries. 

Should the memory battery voltage fall too low to properly maintain the 
program settings, a warning: 

 will alert to replace the 

battery. The sampler utilizes a very small amount of energy from the memory 
battery during normal operation. The service life of the batteries in this 
application is typically five years.