You could divide the output voltage with two resistors to make it 0 or about +5 volts. Put a 2.2k resistor (or two 1k resistors in series) in series with a 1k. Connect:
- The output of the Xantech sensor to the free end of 2.2k,
- The junction of the 2.2k and the 1k to the SECU16 input you want to use,
- The free end of the 1k resistor to both the input common of the SECU16 and to the negative output of the Xantech sensor.
You should now be able to detect the output of the Xantech sensor as an analog value.
"If you don't know what you're doing, do it neatly..."