MR MESSKO MTRAB, Operating Instructions Manual, Page: 24 / 124

3 Product description
24 BA6820378-03 EN
3.7 Self-monitoring function
The dehydrating breather has a self-monitoring function. If an error occurs in
the device, this is indicated by the different lighting patterns of the LEDs
on the front of the terminal box, and also output by the "device error"
signaling relay [ ► Section 3.4, Page 22], position . The following errors are
detected:
▪ Supply voltage failure
▪ Silica gel heating error
▪ Sensor unit fault
▪ Internal error
▪ Ball valve failure (only with the gamma controller)
Also refer to the chapter "Error messages and troubleshooting" [ ► Section 9,
Page 83].
3.8 Outputs
The dehydrating breather features two analog current outputs and two sig-
naling relays for central data collection and further processing of its status.
Analog outputs (active):
Measurement of the temperature and humidity via "sensors" on the upper
air spout (see Function description [ ► Section 3.3, Page 21])
Analog 1 (left) Analog 2 (right)
Temperature Humidity
Regeneration relay output (silica gel heating):
1x changeover contact, regeneration active/inactive
Device error relay output
1x changeover contact, failsafe
3.9 Filter heater (HT version) (optional)
To ensure device functionality in low temperature environments, the stain-
less-steel filter is heated in the HT version. Use of the HT version is intended
for applications in cold regions (ambient temperature is continuously below 0
°C for more than 20 days).