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KNX Tank Sensors

The Ultrasonic Probes KNX SO250 are used for measurement of the fill level of liquids in tanks or for distance measurement. The sensor head is resistant to heating oil and water and can, for example, be used for reservoirs, ponds or oil tanks. With the distance measurement, for example the parking distance of trucks can be monitored.
The KNX software ETS software allows individual parameterization of all bus functions of the KNX SO250. There are five variable thresholds for filling, emptying, dry running protection and overflow alarm. The KNX SO250 has got an additional display, which directly indicates the distance/fill level. The integrated key pad is used for selection of the tank dimensions and setting of two relay switching outputs. When the relays are switched an additional acoustic alarm can be emitted. The KNX SO250 basic has no display and no output relays.


N° 70151 KNX SO250, with 2 relay outputs
N° 70153 KNX SO250 basic

  • KNX SO250 (70151) KNX SO250 (70151)
  • KNX SO250 basic (70153) KNX SO250 basic (70153)
  • Distance measurement
  • Fill level measurement in spherical, rectangular and cylinder tanks. Several similar tanks as battery
  • Setting of bus functions by means of the KNX software ETS
  • 5 switching outputs with adjustable threshold values (Threshold values can be set by parameter or via communication objects)

KNX SO250:

  • 2 relays, setting with the integrated display and keypad

Evaluation Units:

HousingPlastic material
MountingSnap-on fitting on mounting rails
Degree of protectionIP 20
Ambient temperatureOperation 0…+45 °C, storage -25…+70°C
Ambient air humiditymax. 5... 95% RH, avoid bedewing
Data outputKNX +/- bus terminal plug
Communication objects57

Evaluation Unit KNX SO250:

Dimensionsapprox. 123 x 89 x 61 (W x H x D, mm), 7 width units
Weightapprox. 345 g
Operating voltage230 V AC , 50 Hz
Power consumptionmax. 4 W
Outputs• KNX data
• 2 x Relay, potential-free NOC, max. 250 V AC / 7 A

Evaluation Unit KNX SO250 basic:

Dimensionsapprox. 53 x 88 x 60 (W x H x D, mm), 3 dividing units
Weightapprox. 120 g
Operating voltageKNX bus voltage
Bus currentmax. 16 mA

Air ultrasonic probe:

HousingPlastic material
Degree of protectionIP 52
Liquid resistanceWater, fuel
DimensionsTotal diameter approx. 60 mm
Total head height approx. 45 mm
Thread 1½ inches
Connection leadRG 58 coaxial cable with BNC plug
length 10 m
Total weightapprox. 400 g
Ambient temperature+0…+40 °C
Measurement range12…250 cm