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Battery Life

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The following values have been obtained by monitoring each logger type under various logging conditions. As can been seen from this table, there are two important factors in determining battery life. One is the use of Average, Maximum or Minimum readings and the other is low temperatures.
Values shown for "Logging Interval 1 Minute NO Average, Max or Min" and "Logging Interval 1 Minute
Average, Max or Min on at least 1 channel" are for
continual running - never stopping the logger.

Average, Maximum or Minimum Readings

When Average, Maximum or Minimum readings are taken, the logger reads the attached sensors every second and then calculates the average, maximum or minimum at logging time. If the logger is running continually over long periods, and sensors are being powered up every second, battery life will be shortened. On the other hand if the logger is only being used a few days per week or a week per month and is being stopped for the periods it is not in use then there will be no appricable battery life shortning when using average, maximum or minimum readings.

Low temperatures (less the -5º C)

Any battery will produce a lower voltage at lower temperatures. The voltage will recover as the temperature increases. However if the low temperature causes the battery voltage to drop to a point where the microprocessor in the logger can no longer function, this will cause the logger to stop. As the temperature increases and the battery voltage comes back up the microprocessor will reset at power up and the logger status will show "Stopped" with 0 samples.

Logger Type Logging Interval 1 Minute
NO Average, Max or Min
Logging Interval 1 Minute
Average, Max or Min
on at least 1 channel
   microToT 2 years 9 months
   SafeT 1 year 7 months
   T-HR at Normal Working Temperatures > 5 years > 5 years
   T-HR below Normal Working Temperatures (<-5º C) > 5 years > 5 years
   HT-HR > 5 years  
   THT-HR > 5 years  
   Pt-HR at Normal Working Temperatures > 5 years 1.5 years
   Pt-HR below Normal Working Temperatures (<-5º C)   > 5 years 1 year
   Tc-HR at Normal Working Temperatures > 5 years  
   Tc-HR below Normal Working Temperatures (<-5º C) > 5 years  
   mV-HR > 5 years  
   pH-HR with Pt100 Temperature Sensor Connected > 5 years  
   pH-HR Without Temperature Sensor > 5 years  
   WT-HR at Normal Working Temperatures > 5 years 1 year
   WT-HR below Normal Working Temperatures (<-5º C) > 5 years 8 months
   GP-HR No current draw from probes
   Rain, Wind Speed, Wind Direction, Voltage, 4-20mA
> 5 years > 5 years
   GP-HR with T1-PS
   One Temperature (Thermister) Probe Set
> 5 years 5 years
   GP-HR with T2-PS
   Two Temperature (Thermister) Probe Set
> 5 years 5 years
   GP-HR with T3-PS
   Three Temperature (Thermister) Probe Set
> 5 years 5 years
   GP-HR with HT-PS
   Humidity and Temperature Probe Set
> 5 years 11 months
   GP-HR with PT-PS
   General Pressure and Temperature Probe Set
> 5 years 1 year
   GP-HR with PT100-PS
   PT100 Interface with PT100 Probe
> 5 years 1.2 years
   GP-HR with PT1000x1-PS
   One Temperature (PT1000) Probe Set
> 5 years 4 years
   GP-HR with PT1000x2-PS
   Two Temperature (PT1000) Probe Set  
> 5 years 3 years
   GP-HR with PT1000x3-PS
   Three Temperature (PT1000) Probe Set
> 5 years 2.5 years
   GP-HR with Echo-PS
   Adapter for 1 Echo probe  
> 5 years  
   GP-HR with Echo3-PS
   Interface for 3 Echo probes   
> 5 years > 5 years