What the LEDs on the logger tell you

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Program Menu > What the LEDs on the logger tell you

The Mk III and LCD Temprecord loggers have two visible LED's (light-emitting diodes). These are used to both to provide a confirmation of operation of the logger, and to provide information about the temperature limits stored in the logger.

Logger Status	Red LED	Green LED
Ready to be started	off	off
When started	flashes 4 times	off
Counting start delay	off	flashes briefly every 10 seconds
When start delay expires	flashes 4 times	off
Logging, stopped	off	flashes briefly every 10 seconds
Logging or stopped, if lower or upper limit exceeded	flashes briefly every 10 seconds	off
When communicating	off	flashes briefly

The LCD (G4) logger also has two visible LED's and their behaviour is as for the Mk III logger, but the indication of the outside limits condition via a brief flash every ten seconds can be enabled/disabled when the logging parameters are set before the logger is started.

The Mon-T Temprecord logger also has two visible LED's, but their operation is different. The logger status can only be determined by pressing the button on the logger.

Logger Status	Red LED	Green LED
Ready to be started	off	off
On starting	off	6 flashes
Counting start delay	off	off
On start delay expiry	off	6 flashes
Logging, stopped (only when button pressed)	3 flashes if logger out of limits	3 flashes if logger inside limits
On stopping	off	6 flashes

On the LCD (G4) logger the behaviour of the LED's when limits are transgressed is configurable - i.e. when you program a logger you can determine whether the LED's indicate the state of the limits. See Enable Status LEDs for more information.