Sensors

Terms and definitions:

Sensor: a sensor is a sensing device; it observes physicals phenomenon and provides physicals measures. The notion of sensor is generally used to mention all sensing device.

Sensor component: a sensor component is an atomic sensor: it observes one physical phenomenon and provides one physical measure.

Sensor system: a sensor system is a composite sensor: a sensor system can have one ore more sensor component.

Various sensors are used to measure the water level in certain points, and also the water flow rate. Physical sensor may be characterized by several features:

• The physical sensor name as it appears in the SCADA system
• The type of the sensor: Analog Input sensor, analog output sensor, binary input or binary output sensor.
• The description of the sensor
• The measurement unit.
• The maximum domain – this is the maximum domain allowed for this sensor in engineering units.
• The minimum domain – this is the minimum domain allowed for this sensor in engineering units.
• The maximum ADC units domain (used for the analogue to digital or digital to analog conversions in some protocols or data acquisition drivers)
• The minimum ADC units domain (used for the analogue to digital or digital to analogue conversions in some protocols or data acquisition drivers)
• The minimum warning threshold (the minimum level below which there is a warning situation)
• The minimum alert threshold (the minimum level below which there is an critical alert situation)
• The maximum warning threshold (the maximum level above which there is a warning situation)
• The maximum alert threshold (the maximum level above which there is an critical alert situation)