SONO-MIX: The toughest mixer probe for the measurement of concrete moisture

Highest accuracy at the measurement of moisture and material composition in fresh concrete – directly in the mixer using state-of-the-art RbC technology.

Moisture measurement in concrete
The accurate low-cost solution for:

  • Construction Industry
  • Bulk Material Handling

  • Higher safety at the production of fresh concrete due to the precise measurement of the moisture as well as the radar-based conductance (RbC – Radar based Conductance) up to 50dS/m. RbC enables conclusions regarding further parameters of the material recipe such as the cement content and the slope of fresh concrete with the effect of a more reliable quality control and higher cost-effectiveness because recipe errors are prevented.
  • The novel and extremly robust sensor head,
    made of a solid carbide plate and a rectangular ceramic window, offers an unknown long service life. It is fastened with 4 screws and can easily be exchanged.
  • Even in the event of abrasion at the probe head, the automatic measurement compensation enables significantly longer operating periods without the necessity of recalibration.
  • SONO-MIX can even measure steel fiber concrete.
  • High accuarcy even in the wet mixture and thus the possibility to dose the water addition very precise by using recycled water.
  • Highest Reliability: In comparison to Microwave probes, SONO probes provide accurate measurement values even when aggregates are exposed to steam in winter and where the sand and the gravel feature differing grain sizes.
  • The intelligent pre-processing of the measurement values featuring smooth mean value accumulation, adjustable filters, and up to 15 calibration curves for the calibration which is already conducted in the sensor itself. Usually, external evaluation devices are not required.
  • Two variably adjustable analogue outputs 0(4)...20mA allow for the easy connection to any currently existing control system.
  • A RS485 interface
    enables the network operation of the sensor. It already contains a data bus protocol for the connection of several SONO sensors. The connection of the sensor to industrial buses such as Profibus, Ethernet, etc. is possible via optional external modules (available upon request).

Sensor Design
Casing: High Grade Steel V2A 1.4301
Exchangeable especially wear-resistant sensor head: hardened special steel with highly wear resistant ceramic window.
Available upon request: Version for applications with most extreme abrasion.
Measurement Range Moisture
The sensor measures from 0% up to the point of material saturation. Measurement ranges up to 90% moisture are possible with a material specific calibration.
Measurement Range Temperature
Measurement Range: 0°C …100°C
The temperature is measured at the sensor casing beneath the wear-resistant sensor head and can optionally be issued at the analogue output 2. The material temperature can be measured with an external calibration and compensation of the sensor intrinsic-heating.
Power Supply
+7V to +30V DC, 1,5 W max.
Signal Output
2 x Analogue Outputs 0(4)…20mA
Output 1: Moisture in % (variably adjustable)
Output 2: Conductivity (RbC) or optionally the temperature.
In addition, there is the option to split the analogue output 2 into two ranges, into 4..11mA for the temperature and 12..20mA for the conductivity. The analogue output 2 hereby changes over in 5 second cycles between these two (current) measurement windows.
The two analogue outputs can be variably aligned with the SONO-CONFIG software. For a 0-10V DC voltage output, a 500R resistor can be installed.
A RS485 interface enables network operation of the sensor, whereby a data bus protocol for the connection of several SONO sensors to the RS485 is implemented by default. The connection of the sensor to industrial buses such as Profibus, Ethernet, etc. is possible via optional external modules (available upon request).
Measurement Field Expansion
Approximately 50 - 80 mm, depending on material and moisture.
Sensor Dimensions: 108 x 132mm (Diameter x Length)
The mounting and fastening frame can be mounted to the rear side of the mixer base or the outer wall of the mixer. For this purpose, it is adjusted with the help of the additional welded on mounting frame. This enables the easy mounting and dismounting as well as the adjustment of the sensor position in case of wear at the mixer base.
Measurement Range Conductivity
The sensor, as a material-specific characteristic value, delivers in respect to the cement content or the slope of fresh concrete, the radar-based conductance (RbC – Radar-based-Conductance) in a range of 0…50dS/m. The conductivity range is reduced in measurement ranges >50%.
Measurement Data-Preprocessing
MEASUREMENT MODE CA: (Cyclic-Average) For relative short measuring processes with continual average value, filtering and an accuarcy of up to 0.1%.
MEASUREMENT MODE CF: (Cyclic-Float-Average) For very slow measuring processes with floating average value, filtering and an accuarcy of up to 0.1%.
MEASUREMENT MODE CS: (Cyclic-Successive) For very short measuring processes without floating average with internal up to 100 measurements per second and a cycle time of 200 milliseconds at the analogue output.
Ambient Conditions
0 - 70°C; A higher temperature range is available upon request!
The sensor is provided with a universal calibration. A maximum of 15 different calibrations can be stored. For special materials, variable calibrations with polynomials up to the 5th order are possible and can be downloaded into the sensor with the SONO-CONFIG software. A zero point correction can be performed easily with the SONO-CONFIG software.
Connector Plug
The sensor is equipped with a robust 10-pole MIL flange connector. Ready made connection cables with MIL connectors are available in the lengths 4m, 10m, or 25 m.