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EL-USB-4
4-20mA Current Loop USB Data Logger
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).
- Green single flash,
every 30 seconds
- Green single flash,
every 10 seconds
- Red single flash,
every 10 seconds
- Red double flash
every 10 seconds
- Green single flash,
every 20 seconds
- Red single flash,
every 20 seconds
- Red double flash,
every 20 seconds
- Green double flash,
every 20 seconds
- Red/Green single flash,
every 20 seconds,
alarm latching turned on
- No LEDs flash
Logger primed and ready to start.
Logging in progress, last stored value OK
Logging in progress, the last stored reading is equal to or exceeds the low alarm level
(If latching is turned on, then a stored value is equal to or exceeds the low alarm level)
Logging in progress, the last stored reading is equal to or exceeds the high alarm level
(If latching is turned on, then a stored value is equal to or exceeds the high alarm level)
Low battery, logging in progress, the last stored value OK
Low battery, logging in progress, the last stored value is equal to or exceeds the low alarm level
Low battery, logging in progress, the last stored value is equal to or exceeds the high alarm level
Logger is full, last stored value OK
Logger is full, last stored value is equal to or exceeds the low or high alarm level
LEDs disabled during configuration to save battery power and increase logging duration.
or
Battery dead.
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.
PO Box 770, Londonderry, NH 03053 1-800-821-0023
warning EL-USB-4
Specifications liable to change without prior www.martelcorp.com Issue 1
July/2005
M.C.
Applies to EL-USB-4/1
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