MR MESSKO COMPACT - Page 25

4 Product description
255831400/02 EN
▪ The displayed temperature corresponds to the winding temperature based
on the oil temperature, secondary transformer current and the tempera-
ture difference.
▪ The secondary transformer current supplies a heating resistor in the me-
chanical pointer thermometer with power, thus causing a temperature in-
crease that corresponds to the loading of the transformer, as compared to
the actual oil temperature that was measured.
Type TT
The pointer thermometer transmits the measured temperature via a passive
4…20mA analog output.
You will find information on the electrical connection in the section Connect-
ing the interfaces [►Section 6.4.6, Page 62].
Type TTM
The pointer thermometer transmits the measured temperature via an active
4…20mA analog output and/or an RS485 interface for Modbus RTU.
The device needs a 24VDC power supply for this. This is also
the case even if you only connect the 4…20mA analog out-
put.
You will find information on the electrical connection in the section Connect-
ing the interfaces [►Section 6.4.6, Page 62].