Martel Electronics EL-USB-4 - Manual (Page 2)

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LED FLASHING MODES
EL-USB-4 features a red and a green LED.
The LEDs on an EL-USB-4 will flash in one of the following ways, assuming alarm latching is turned off (exact
timings to be confirmed).
By default latching is disabled. The red LED will then no longer continue to flash after the logged curent has
returned to normal. Instead, the green LED will then flash.
Latching can be turned on via the control software, so the red LED will continue to flash, even after the logged
current 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 level has been exceeded, without the need to download the data
from the logger.
- Green single flash, Logger primed and ready to start.
every 30 seconds
- Green single flash, Logging in progress, last stored value OK
every 10 seconds
- Red single flash, Logging in progress, the last stored reading is equal to or exceeds the low alarm level
every 10 seconds (If latching is turned on, then a stored value is equal to or exceeds the low alarm level)
- Red double flash Logging in progress, the last stored reading is equal to or exceeds the high alarm level
every 10 seconds (If latching is turned on, then a stored value is equal to or exceeds the high alarm level)
- Green single flash, Low battery, logging in progress, the last stored value OK
every 20 seconds
- Red single flash, Low battery, logging in progress, the last stored value is equal to or exceeds the low alarm level
every 20 seconds
- Red double flash, Low battery, logging in progress, the last stored value is equal to or exceeds the high alarm level
every 20 seconds
- Green double flash, Logger is full, last stored value OK
every 20 seconds
- Red/Green single flash, Logger is full, last stored value is equal to or exceeds the low or high alarm level
every 20 seconds,
alarm latching turned on
- No LEDs flash LEDs disabled during configuration to save battery power and increase logging duration.
or
Battery dead.
EL-USB-4
4-20mA Current Loop USB Data Logger
Specifications liable to change without prior warning EL-USB-4 Issue 1 July/2005 M.C. Applies to EL-USB-4/1
PO Box 770, Londonderry, NH 03053 1-800-821-0023
www.martelcorp.com