3 Product description
23BA6820378-03 EN
9 Signaling relay 10 Analog output 1 (temperature)
Analog output 2 (humidity)
0…20mA or 4…20mA
11 RS485 interface (optional)
3.5 Controller for silica gel heating
The MTRAB dehydrating breather is delivered with an alpha controller, beta
controller or gamma controller.
The recommended application areas for the different versions of the dehy-
drating breather are specified in the Applications table (see [►Section 12.2,
Page 108]).
3.6 Status LEDs
There are 3 LEDs on the front of the terminal box that indicate the
status of the device.
Figure4: LEDs
1 Operating status – green LED
2 Regeneration heater – yellow LED
3 Device error – red LED
An explanation of the various device status messages is given in the chapter
Status messages [►Section 9.2, Page 87].