The Probe

  • Level Measurement Range Level measurement range from 0.25 to 5 m (0.8 to 16.4 ft)
  • Versatile Can be used in a wide range of applications for liquids or slurries in closed or open vessels
  • Accurate and Reliable Error in measurement = 0.25% of measuring range (in air)
Product Options


The Probe is an ultrasonic liquid level sensor for monitoring of liquids and slurries in open or closed channels. The ultrasonic transducer can be ETFe or PVDF copolymer, which means The Probe can be used in a wide variety of applications. It is also easy to install and maintain. Reliability is based upon Sonic Intelligence echo processing algorithms. A filter discriminates between true and false echoes from acoustic or electrical noises and the agitator blades in motion. The ultrasonic pulse propagation time to the material and back is temperature-compensated and converted into distance for display, analog output and relay actuation.

Manufactured by: Siemens-Milltronics
Model: The Probe

Services offered for this product

  • Sales
  • Rental
  • Installation
  • Calibration
  • Maintenance


Chemical storage vessels
Filter beds
Mud pits
Liquid storage vessels
Food applications
Loop powered applications


  Three-wire Version Two-wire Version (standard)
Mode of operation    
Measuring principle 0.25 - 5 m
(0.8 - 16.4 ft)
0.25 - 5 m
(0.8 - 16.4 ft)
mA 4 - 20 mA 4 - 20 mA
- Span Proportional / inversely proportional Proportional / inversely proportional
- Max. load 750 Ω at 24 V DC 600 Ω in the loop at
24 V DC
Relay For level alarm or faultNo
Power supply  
Supply voltage 18 to 30 V DC, max. 0.2 A 12 to 28 V DC, 0.1 A surge
Max. power
5 W (200 mA at 24 V DC)0.75 W (25 mA at 24 V DC)
Certificates and approvals CE, C-TICK, CSAUS/C,
Error in measurement 0.25 % of measuring range (in air)
Resolution 3 mm (0.125")
Temperature compensation Built in
Echo processing Sonic Intelligence
Rated operation conditions    
Beam angle 12°
Ambient temperature    
- Standard -40 to +60 °C (-40 to +140 °F)
- Metallic mounting -20 to +60 °C (-4 to +140 °F)
Max. static operating
Normal atmospheric pressure
Degree of protection IP65
- Without flange adapter 1.5 kg (3.3 lbs)
- With flange adapter 1.7 kg (3.7 lbs)
- Electronics enclosure PVC
- Transducer PVDF copolymer
Degree of protection IP65
Process connection 2” NPT [(Taper), ANSI/ASME B1.20.1]
R 2” [(BSPT), EN 10226] or
G 2” [(BSPP), EN ISO 228-1]
Cable inlet 2 inlets for PG 13.5 or ½” NPT cable glands


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