Liebert EM manual Thresholds in the Web Interface, Temperature/Humidity Sensor Thresholds

Web Interface Overview

4.4Thresholds in the Web Interface

The OpenComms EM collects data from connected sensors at regular intervals. When a reading crosses a user-defined threshold:

•The sensor’s status changes.

•Alerts are sent—if the unit is configured for e-mail, pager or SNMP trap alerts.

4.4.1Temperature/Humidity Sensor Thresholds

Temperature and humidity sensors have four thresholds: High Critical, High Warning, Low Warning and Low Critical. The Normal range is determined by these limits. Table 7 shows examples of limits for these types of sensors. Each level is color-coded in the Web interface for easy identification.

Table 7 Examples of sensor limits - temperature and humidity sensors

	Examples of Limits		Text Display Color		Graph
	Temperature	Humidity	Sensor	Status &	Line
Limit	(°F)	(% RH)	Name	Current Value	Color
High Critical	85	55	Red	Red	Red
High Warning	75	50	Yellow	Yellow	Yellow
Low Warning	65	30	Yellow	Yellow	Yellow
Low Critical	60	25	Red	Red	Red
Other conditions
Normal	66°F to 74°F	31% to 49%	Green	Green	—
Not Present	(sensor is not	connected)	Gray	Black	—

Using the examples of temperature sensor limits in Table 7, the following is a typical scenario:

•The temperature of a monitored area rises to 90°F. The status changes at two points:

•The status changes to High Warning when the temperature reaches 75°F. The name of the sensor, the current reading and the status are displayed in yellow text in the Web interface.

•As the temperature continues to rise, the status changes to High Critical at 85°F (displayed in red text).

•At each change in status, the unit sends alerts if it is configured to do so.

•When the temperature falls to 74°F, the status changes to Normal (displayed in green text) and a return-to-normal alert is sent if the unit is configured to send alerts.

•When a sensor is disconnected from the unit, its status changes to Not Present (black text) and the sensor’s name appears in gray text.

4.4.2Dry-Contact Sensor Thresholds

A dry-contact sensor has only two states: Normal and Critical, as shown in Table 8. The user defines Normal as either Normally Open or Normally Closed and the OpenComms EM designates the opposite state as Critical.

Table 8 Examples of sensor limits - temperature and humidity sensors

		Text Display Color		Graph
	Example of	Sensor	Status &	Line
Limit	User-Defined State	Name	Current Value	Color
Critical	Closed	Red	Red	Red
Other conditions
Normal	Normally Open	Green	Green	—
Not Present	(sensor is not connected)	Gray	Black	—

Using the examples for a dry-contact sensor in Table 8, the following is a typical scenario:

•The sensor’s normal state is defined as Normally Open.

•When the contact closes, the sensor’s status changes to Critical (displayed in red text). The unit sends alerts, if it is configured to do so.

•When the state changes again (the contact opens), the sensor’s status changes to Normal (dis- played in green text) and a return-to-normal alert is sent if the unit is configured to send alerts.

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