LED FLASHING MODES

EL-USB-TC features2LEDs.

- The first LED flashes orange (O) to indicatea problem condition on the EL-USB-TC.

- The second LED flashesgreen or red (G/R) to indicatealarm level status.

Itwillflash red when the loggedtemperature has exceededa Low orHigh alarm level.

By default latching is enabled, so the red LED will continue to flash even after the logged temperature has returned

to normal. The red LED will effectively have latched into its alarm condition. This feature ensures that the user is

notified that an alarm levelhas been exceeded, without the need to download the data from the logger.

Latching can be turned off via the control software. The red LED will then no longer continue to flash after the

logged temperaturehas returned to normal. Instead, thegreen LED willflash.

The LEDs onthe EL-USB-TCwill flash in one of the following ways:

Red LED flashes once every 10 seconds

- The most recently logged temperature is equal to or lower than the Low alarm level.

NB: If latching is enabled, then the alarm condition may have been triggereda while

Red and Orange LEDs flash once every 10 seconds

- The most recently logged temperature is equal to or lower than the Low alarm level,

but the data logger's memory is full, so no more readings are stored.

NB: If latching is enabled, then the alarm condition may have been triggereda while ago.

Red LED flashes twice every 10 seconds

- The most recently logged temperature is equal to or higher than the High alarm level.

NB: If latching is enabled, then the alarm condition may have been triggereda while ago.

Red and Orange LEDs flash twice every 10 seconds

- The most recently logged temperature is equal to or higher than the High alarm level,

but the data logger's memory is full, so no more readings are stored.

NB: If latching is enabled, then the alarm condition may have been triggereda while ago.

Green LED flashes once every 10 seconds

- The most recently logged temperature is between the Low alarm and High alarm levels.

Green and Orange LEDs flash once every 10 seconds

- The most recently logged temperature is between the Low alarm and High alarm levels,

but the data logger's memory is full, so no more readings are stored.

NB: If latching is enabled, thena flashing green LED indicates that no alarm condition has ever been logged.

Green LED flashes twice every 10 seconds

- The data logger is not currently logging, but is primed to start ata later date and time.

O

G/R

No LEDs flash

- The logger is not being used.

or

- The logger was logging, but has now shut down due toa flat battery (voltage has dropped below 2.8V).

Plug the data logger into the PC and run the control software to find out which condition applies.

Orange LED flashes once every 60 seconds

- The battery is reaching the end of its useful life, as its voltage has dropped below 3.3V.

- Data logging continues until the battery voltage drops below 2.8V.

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EL-USB-TC

Thermocouple Data Logger with USB Interface

Specifications liable to change without prior warning

EL-USB-TC

Issue 4

04/2008

S.C.

Applies to EL-USB-TC