You would use the 0-10 VDC input on the UNI plus. To convert the signal from the TL-136 which is 4-20ma you need a conversion circuit. See: Convert 4-20 mA to 0-10 V using a resitor | Support of ACE AUTOMATION Europe basically a resistor to develop a voltage drop.
The TL-136 info from HA here: Arduino ESP8266 with TL-136 liquid level sensor