Datasheet

EL-USB-4
4-20mA Current Loop Data Logger
Issue 18 09/2018 Page 2 of 3
www.lascarelectronics.com/data-loggers
LED STATUS INDICATION
The EL-USB-4 features two LEDs: a green/red LED to indicate logging and alarm status.
In normal operaon the green LED will ash, but will change to red if an alarm condion has been triggered. Using EL-WIN-USB it
is possible to set the alarm to remain acve even if the reading has returned to normal, in which case the alarm LED will connue
to ash red. This ‘Hold’ feature in the soware ensures the user is noed that at some point an alarm level has been exceeded,
without needing to download the data.
Green single ash (Every 10 Seconds)
The data logger is currently logging, no alarm.
Green single ash (Every 20 Seconds)
The data logger is currently logging. No alarm. Although, baery is low and should be replaced before logging important data.
Green single ash (Every 30 Seconds)
The data logger is not currenty logging, but is primed to start at a later date and me (delayed start).
Green double ash (Every 20 Seconds)
The data logger is full and has stopped logging, no alarm.
Red single ash (Every 10 Seconds)
The data logger is currently logging. Low alarm.
Red single ash (Every 20 Seconds)
The data logger is currently logging. Low alarm. Although, baery is low and should be replaced before logging important data.
Red double ash (Every 10 Seconds)
The data logger is currently logging. High alarm.
Red double ash (Every 20 Seconds)
The data logger is currently logging. High alarm. Although, baery is low and should be replaced before logging important data.
Red & green single ash (Every 20 Seconds)
The data logger is full and has stopped logging. High, Low or both alarms.
No LEDs ash
The data logger is stopped, the baery is empty or there is no baery ed.
CONNECTION & APPLICATIONS
+
_
Sensor
(current source)
Signal out
+ve supply to sensor
-ve/GND supply to sensor
+
_
4-20mA current
loop transmitter
other 4-20mA
current loop devices
I out I in
+
_
Sensor
(current sink)
Signal out
+ve supply to sensor
-ve/GND supply to sensor
+
_
Sensor
(current source)
Signal out
+ve supply to sensor
-ve/GND supply to sensor
+
_
4-20mA current
loop transmitter
other 4-20mA
current loop devices
I out I in
+
_
Sensor
(current sink)
Signal out
+ve supply to sensor
-ve/GND supply to sensor
+
_
Sensor
(current source)
Signal out
+ve supply to sensor
-ve/GND supply to sensor
+
_
4-20mA current
loop transmitter
other 4-20mA
current loop devices
I out I in
+
_
Sensor
(current sink)
Signal out
+ve supply to sensor
-ve/GND supply to sensor
Connecng to a current source sensor. Connecng to a current loop transmier. Connecng to a current sink sensor.