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

EM specifications

The Liebert EM is a state-of-the-art, modular and scalable cooling solution designed to meet the needs of today's data centers and IT environments. This innovative unit offers unmatched precision and flexibility, making it ideal for facilities that require meticulous temperature control and energy efficiency.

One of the main features of the Liebert EM is its modular design, allowing for easy expansion and customization based on the specific requirements of a facility. This scalability ensures that organizations can efficiently adapt to changing cooling demands without the need for significant infrastructure changes. The system can be configured in various capacities, making it suitable for spaces of different sizes and cooling needs.

Incorporating advanced technologies, the Liebert EM utilizes inverter-driven compressors, allowing for variable refrigeration capacity. This feature optimizes energy consumption, reducing operational costs while maintaining precise temperature control. The unit is designed with built-in smart controls that enable real-time monitoring and adjustments, ensuring enhanced performance and efficiency across the entire cooling system.

The Liebert EM also comes equipped with EC (Electronically Commutated) fans, which contribute to its energy efficiency by adjusting their speed according to the cooling load. This not only ensures adequate airflow but also minimizes energy waste, leading to lower overall operating costs.

Furthermore, the system features intelligent connectivity options that facilitate integration with existing building management systems. This capability allows for centralized monitoring and control, empowering facility managers to maintain optimal conditions and respond quickly to any fluctuations in temperature or humidity.

Safety and reliability are also paramount in the design of the Liebert EM. The unit includes comprehensive backup systems and redundancy features to ensure continuous operation even in the event of a component failure. This reliability is crucial for critical applications where downtime can result in significant losses.

In summary, the Liebert EM stands out as a versatile and high-performance cooling solution, equipped with advanced technologies that offer scalability, energy efficiency, and precise temperature control. Its modular design, coupled with intelligent control options, makes it an essential component for modern data centers looking to optimize their cooling infrastructure while ensuring reliability and reducing operational costs.