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What do the LEDs on a data logger indicate?

Most Tinytag data loggers have one or more LEDs that indicate the status of the logger. In most cases, the LEDs indicate that the logger is waiting to record, recording or that an alarm is active.

A close-up of the green and red LEDs on a Tinytag Ultra 2 data logger.

USB data loggers

Ultra 2, Plus 2, Talk 2, View 2 and Transit 2 data loggers

Ultra 2, Plus 2, Talk 2, View 2 and Transit 2 data loggers have two LEDs, one green and one red.

A green LED is used to show the logger is recording.

A red LED is used to indicate an active alarm.

The LEDs have different flash patterns to indicate different states. In most cases, the flash patterns indicate the following:

  • Single green flash every eight seconds >> Waiting to record (logger set for a delay or trigger start)
  • Single green flash every four seconds >> Logger recording
  • Single red flash every four seconds >> Alarm active

Splash 2 and Aquatic 2 data loggers

Tinytag Aquatic 2 and Splash 2 data loggers have a single red LED which indicates both when a logger is recording and when alarms are active:

  • Single red flash every eight seconds >> Waiting to record (logger set for a delay or trigger start)
  • Single red flash every four seconds >> Logger recording
  • Double red flash every four seconds >> Alarm active

In all cases, a flashing red LED is not a low battery warning. Tinytag Explorer will give low battery warnings for most data logger models. You can find out how to check your data logger's battery in our helpful article: How to check my data logger's battery status.

CO2 data loggers

CO2 data loggers have a single LED that can flash either green or red.

The flash patterns for the logger are the same as for Ultra 2, Plus 2, Talk 2, View 2 and Transit 2 data loggers (described above).

Additionally, one alarm channel has been preconfigured to flash red when mains power to the logger has been disconnected. When this happens, the sensor will no longer be powered so the logger will record 0ppm.

Tinytag Radio products

Radio products have a single LED that can flash either green or red:

  • A flashing green LED indicates that a logger is working correctly.
  • A flashing red LED indicates that either an alarm is active, the device is out of communication with the Connect Gateway or a low battery.

Tinytag LAN products

Tinytag LAN (Ethernet) data loggers and the Ethernet Radio Receiver have two LEDs: one that flashes red or green, the other that flashes yellow or blue:

  • The red/green LED flash pattern is the same as for radio data loggers as described above.
  • The yellow/blue LED will show yellow when there is power but no LAN communications, and flicker blue when there are LAN communications.

For further information on LED flash patterns, please see individual product data sheets.

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