Chapter 6: Diagnostics and troubleshooting
HOBO Energy Logger Pro User’s Guide 23
Battery Low (Red)
This indicator blinks when battery power is at less than 25% capacity, or if the batteries are installed improperly.
The logger will continue logging until the batteries are dead; however, you should read out the data and replace the
batteries as soon as possible, before the batteries die, and then relaunch the logger. Or, attach an external power
source if possible.
If this indicator continues to blink even after you have replaced the batteries:
• Check that the batteries are installed properly. If the polarity of any of the batteries is incorrect, this
indicator will blink.
• Make sure you are using the correct battery type. The logger uses eight 1.5 volt AA alkaline or lithium
batteries. The battery type must be specified correctly on the Launch Logger dialog for the correct battery
status to be reported.
• Make sure all batteries are of the same type - either all alkaline, all enhanced alkaline, or all lithium. Never
mix battery types.
• Check the battery expiration date. Verify that the expiration date is at least two years from the current date.
Batteries can lose significant capacity if stored at elevated temperatures.
• Check the voltage of the batteries with a voltmeter. Alkaline batteries should be at least 1.5 V per cell when
new; fresh lithium batteries should be 1.6 V per cell.
Sensor Fail (Red)
This indicator blinks when there is or has been a FlexSmart module or Smart Sensor communication failure.
Tip: If the
Sensor Fail indicator is blinking, you should read out the logger, investigate the problem, and then
relaunch the logger.
• If the Sensor Fail indicator is blinking in conjunction with the Logging indicator, there was a communication
failure, but the system has recovered. There may be an intermittent problem. Try checking the FlexSmart
modules and Smart Sensors one at a time to make sure they are all communicating. If you find a bad
module or sensor, or if no module or sensor communicates, contact your Onset Authorized Dealer or Onset
Technical Support.
• If the
Sensor Fail indicator is the only one that is blinking, at least one FlexSmart module or Smart Sensor is
currently not communicating. You should investigate this problem immediately. Look for a loose
connection, which could cause bad electrical contact with a module or sensor. If found, remove the
offending module or sensor and check its wires and connector for damage and/or signs of moisture.
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