Moisture Sensors for Construction Aggregates

MESA Systems Co. offers three moisture measurement sensors for on-line aggregate. Designed for installation below a clam-gate, on a conveyor or a weigh belt, these probes and sensors are both user-friendly and intelligent. Each device comes with 15 standard linear calibration based on material type and installation.

How moisture sensors work:

The SONO-VARIO sensor is tailored for your intended application in concrete production and asphalt production. Furthermore, 15 standard linear calibrations are pre-programmed in the sensor to meet you material needs. The SONO-VARIO is capable of measuring aggregates ranging from fine sand to stone and crushed rock up to 1 ¼”. Algorithms and filters allow for accurate measured values and adjustable settings. Measurement values, taken at intervals of 4 per second, are transmitted to your desired batching system or local notebook computer. Interfacing to common batching control system is simple using the flexible analog output.


Unlike other moisture measurement probes, the SONO-VARIO sensors’ measurement field adapts to the material being measured. This is particularly useful for sand and similar fine materials, where the material tends to contain the measurement field. Larger diameter gravel or stones allow the measurement field to expand and penetrate further into the material volume. Measure aggregates from fine sand to 1-1/4” stone  by selecting a material specific calibration. In addition to the adaptive measurement field feature, SONO-VARIO sensor electronics are not influence by material temperature or color. Furthermore, even in the event of abrasion at the probe head, the automatic measurement compensation feature enables significantly longer operating periods without the necessity of re-calibration or adjustment. Achieve reliable quality control and higher cost-effectiveness by preventing recipe errors with precise measurements.

SONO-VARIO Technology:

All SONO-VARIO sensors use TRIME® TDR-method for moisture measurement, more commonly known as Guided Wave Radar or Cable Radar. Cable Radar uses a high frequency low voltage pulse that travels along a radar track, embedded in the surface of a SONO-VARIO sensor. The pulses travel close to the speed of light generating a measurement field that propagates in slices out from the sensor’s surface, similar to computer tomographic (CT-scan) but for moisture measurement.

Please contact MESA Systems Co. for guidance on which moisture measurement device is the best fit for your application and installation.