Moisture Measurement System (MMS)

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Measures Moisture Content as the Aggregate Moves Through the Plant

The MMS Model 3630 uses proven nuclear technology to continuously monitor moisture in your aggregate mix.

The moisture measurement occurs as the mix moves through the plant on the conveyor belt. There is no physical contact with the aggregate mix or belt. The system provides a continuous reading of the moisture content. The moisture content, combined with the knowledge of the mass proportions of the other components in the mix, provides you with a precise and reliable moisture content of the aggregate.

A Green Solution

The MMS is a proven tool to help reduce carbon emissions during the asphalt production process. It can be integrated into the burner controls, or simply used by the operator to lower burner temps when able and increase when needed. The system integrates into the plant software to provide a real time moisture to the mixing system. This helps stabilize the amount of liquid asphalt input, reducing waste, and making the product more consistent. With EPD’s and sustainability goals ahead, this is a proven tool to help achieve those efficiency goals.

Saves Time and Money

An unknown change in moisture of the raw materials (often due to weather) will have a large impact on the quality and performance of the product made at your asphalt plant. With the MMS, moisture content of the combined aggregate is always known.

Knowing the correct dry weights of aggregate allows for more accurate mixing, resulting in savings by eliminating wasted binder. Additionally, knowing the moisture content of the aggregate mix entering the drum allows optimum temperature control resulting in additional savings from fuel.

Moisture Data can be Sent to Your Controls or Displayed in the Control Room

The MMS sends a standard signal as a current or voltage which can be sent to the control system for display to aid in the control of the plant parameters.

The control center displays the moisture data in real time, and users can download in a simple .csv as well.


Measurement Specifications

Precision (expressed as 1 standard deviation) @ 3% wt/wt Moisture and 2.2 g/cm3 density
                     Count Time 5 seconds 10 seconds
3” thick sample ±0.4 to 0.5% wt/wt ±0.3 to 0.4% wt/wt
4” thick sample ±0.32 to 0.4% wt/wt ±0.25 to 0.32% wt/wt
5” thick sample ±0.28 to 0.35% wt/wt ±0.22 to 0.28% wt/wt

Mechanical Specifications

Top Enclosures



18.8” x 14.5: L x 57.5” W

57.2 lbs.

Bottom Enclosure 1



6.8” H x 15.75” L x 15” W

62.4 lbs.

Bottom Enclosure 2



9.5: H x 15.75” L x 15” W

62.4 lbs.

Mounting Frames



30.1: x 19” L x 53” W

55.7 lbs.

Electrical and Environmental Specifications

Operating Temperature 32 ° to 140 ° F ( 0 ° to 60 ° C)
Humidity 98% non-condensing
Supply Voltage 120 VAC (±10%), 1A, 60 Hz
Standard Signal Output 0 to 20 mA, 4 to 20 mA or 0 to 10V isolated analog output
User Interface

(HMI for Maintenance)

8.0” Fanless Industrial Touch Panel PC

IP65 rated front panel

1024 x 600 (WSVGA) Native resolution

Radiological Specifications

The MMS contains small sealed radioactive sources. The system is registered as a generally licensed device and distributed as such.