Sensor configuration
Here we show you how to configure the smart sensors connected to the Ethernet-based Didactum Monitoring System.
Under "Main Menu" >> "System Tree" or "Group Tree," simply select the desired sensor by clicking on it.
A window will then appear displaying the current configuration of the selected sensor.
Sensor settings menu:
| Name | The sensor name is automatically assigned and can be changed |
| Group | Individual sensors can be grouped together under "Group Tree" |
| ID | Identification name of the corresponding sensor |
| Type | The sensor type is displayed here, e.g. Temperature |
| Class | Display of the sensor class: Analog, CAN, Switch, Discrete |
| Hardware Port: | Display of the sensor port on the IT monitoring system to which the sensor is connected. |
Hysteresis functions (from Didactum firmware 2.7.3 onwards)
Example:
Due to an undersized air conditioning system, the IT racks installed in the server room are not adequately cooled. With the onset of early summer, the outside temperature rises sharply, forcing the air conditioner to operate at its limit.
The temperature sensors installed in the server racks measure temperature values in real time, fluctuating between "high warning level" and "high alarm level." An SMS alert has been configured in the IT monitoring device to trigger when temperatures in the 19-inch racks exceed the set temperature.
To limit the number of alarm notifications when sensor states change, a 360-second time window has been defined using the Didactum hysteresis function. Only after this predefined time has elapsed does the corresponding sensor switch to the new state, and the notifications, alarms, and actions defined in the logical scheme are automatically triggered.
Important Note:
Please note that the hysteresis function is only supported by the new generation of SNMP-enabled Didactum measurement and alarm systems. Firmware version 2.7.3.b012 (or higher) is required for this.
Switching between 2 sensor states
A hysteresis function can be configured for every intelligent, SNMP-enabled sensor from Didactum. If you do not require hysteresis, please set the function to "disabled."
For example, if the intelligent temperature sensor constantly fluctuates between two different (measurement) states (High Warning Level / High Alarm Level), the hysteresis function can be used to define a time delay for the sensor's state. This can significantly reduce the number of notifications and alarm messages when the sensor state changes.
The hysteresis can be based on a specific time period or a specific measurement value. If a specific time (in seconds) is defined in the hysteresis function, the sensor will transition to the new state with a delay. The timer starts counting from the moment the intelligent sensor's measurement leaves the predefined state.
Fine-tuning of the intelligent sensors
Didactum's intelligent sensors are factory calibrated. In rare cases, the readings may be too high or too low. Using a linear formula, the temperature sensor, for example, can also be calibrated (fine-tuned) afterward.
Let's look at the following example of an SNMP-enabled temperature sensor.
We'll use the following formula: