12.1.2 Alarm output
The device has two independent switching points, each of which triggers a relay. The relays
can be used either as early warning/main alarm, or as output for the dryer regulation and
alarm signal.
Both the outputs are configured as Normally Closed at works, that means in normal
operation, the contact is closed. In case of alarm or failure of operating voltage, the contact
opens up (safety function).
The relays are potential free, however, these should be used only for switching of safe low
voltage!
12.1.3 Analog output
The device has an analog output for an industrial standard signal 4... 20 mA. The measured
dew point is given out at this output, which can be further evaluated, for example, with an
SPS or a data acquisition system.
The scaling of the signal is 4 mA = -40° tpd, 20 mA = 20 °C tpd.
The output is not potentially isolated. The output takes place as current source against
device ground. The maximum load resistance is 400 Ohm. For connection to super level
control system, probably an isolating amplifier is required, in order to avoid earth
interconnection. Please also ask the manufacturer of super level regulation system about the
final requirements.
