Installation and User Guide DEVIreg™ Multi
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Common terms and abbreviations
Term Explanation
Sensor In this content, always a temperature sensor – NTC, PT1000, etc..
NTC NTC temperature sensor. NTC stands for “Negative Temperature Coefficient”. NTC sensor is
resistor with a negative temperature coefficient, which means that the resistance decreases
with increasing temperature.
PT1000
Temperature sensor. PT refers to that the sensor is made from Platinum (Pt). 1000 refers to that at 0°C
sensor has a resistance of 1000 Ohms (Ω). Sensor has Positive Temperature Coefficient (PTC).
RTC Real Time Clock
BMS A building management system (BMS), is a computer-based control system installed in build-
ings that controls and monitors the building’s mechanical and electrical equipment such as
ventilation, lighting, power systems, fire systems, and security systems.
RS-485 RS-485 or RS485, also known as TIA-485(-A) or EIA-485, is a standard defining the electrical
characteristics of drivers and receivers for use in serial communications systems.
RCD Residual-current device
CMR Current Monitoring Relay
NO
Normally Open relay. Has an initial opened circuit state when no current is applied to its coil
so basically the internal switch disconnects the power to the load in the inactive state.
NC Normally Close relay. Has an initial closed-circuit state when no current is applied to its inter-
nal coil therefore the internal switch connects the power to the load. When voltage is applied
to the coil of the NC relay the internal switch goes to the open position and disconnects the
power from the load.
MCX Danfoss Programmable Controller. DEVIreg™ Multi is based on MCX08M2 controller