Liebert EM User Manual

The OpenComms EM sensor data may be viewed in graphic format, along with the sensor’s upper and 

lower alarm limits, as described in 5.3.1 - Configure Sensors.
The OpenComms EM stores up to 1,440 data samples for each sensor. Sensor data samples can be 

stored at intervals of 1 minute, 5 minutes, 10 minutes or 15 minutes. (To change the data sample 

rate, see 5.7.3 - Data Presentation.) 
These sample rates correspond to 24 hours of data samples collected at 1-minute intervals, 5 days for 

5-minute intervals, 10 days for 10-minute intervals and 15 days for 15-minute intervals. 
Sensor data samples are lost when the sensor is disconnected from a port or when the unit is shut 

down or loses power. You can use SNMP to sample sensor data at a different rate or to store larger 

amounts of data. (To activate SNMP traps, see 5.5.3 - SNMP Trap Alerts Setup. To set up SNMP 

properties, see 5.7.2 - SNMP Information.) 
To access the Sensor Graphs window, log in (see 5.1 - Open the Web Interface and Log In) and:

• Click on the Sensors tab at the top of the Web interface, as shown below.

• Choose a sensor from either of two lists on the left side of the window, as shown above:

a. Click on a link in the connected sensors list, or
b. Click on the Down arrow to the right of the drop-down list and select a name from the list.

• On the right side of the window, click on the Graph button, as shown above. The right side of the 

window shows a graph of current sensor data, upper and lower limits, as in the example in 

a. Connected 

b. Drop-down