The Dryer Master AM3: Moisture Monitoring with State Control

AM3 Panel

The AM3 - (Automatic Mini Moisture Manager) is a real-time in-line moisture monitoring and moisture control solution that is ideal for measuring product moisture at the exit of a grain dryer. The AM3 is also capable of some simple automatic moisture control.

The Components

The AM3 comes with one of Dryer Master's stainless steel fin type moisture sensors, a high performance ¼ DIN Micro PLC (available either pre-mounted in a Nema4 enclosure, or un-mounted for user configured installation), and an optional calibration button. The display panel is used to enter calibrations and display and store moisture information. An optional printer is available to provide a printed record.

How it works

Product moisture is measured by the Dryer Master moisture sensor, which is easy to calibrate against a bench top manual tester, and then displayed on the AM3 panel.

The AM3 is a state machine, with control adjustments made only when preset triggers are met. The operator inputs high, low, and target moisture triggers for each of three user setable discharge rate speeds and response time settings. Moisture control is achieved by switching between the discharge rate speeds as triggered by the setable moisture targets. This is a system intended for a more hands on style of operation as the speed set points and moisture targets will need periodic adjustments to maintain optimum performance.

The system interfaces with most modern variable frequency drives directly and usually only requires a small isolation interface to operate non isolated SCR controllers.

The Results

With occasional tweaking of the settings the system is capable of achieving quite good moisture control.

The AM3 can provide printed records of operation as well as store data to a removable memory module for retrieval to a computer. It can also be connected to a plant wide automation system.

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