What do the LEDs on a data logger indicate?
Most data loggers have one or more LEDs that indicate the status of the logger.
USB Connection Data Loggers
On most data loggers that connect to a computer using a USB cable or pad, a green LED is used to show the logger is recording and a red LED is used to indicate an active alarm.
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
On data loggers that only have a single red LED (Tinytag Aquatic 2 and Splash 2 data loggers) the LED 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 - Talk 2, Ultra 2, Plus 2, View 2, Aquatic 2 and Splash 2).
CO2 Data Loggers
CO2 data loggers have a single LED that can flash either green or red:
- The flash patterns for the logger are as described above for loggers with individual green and red LEDs.
- Additionally, one alarm channel has been set 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 Plus LAN Products (Including Ethernet Radio Receiver)
Tinytag Plus LAN 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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