Discharge Moisture Sampler
Last updated
Dryer Operations
Last updated
The discharge moisture sampler is used to continuously collect a sample of grain, move it past the discharge moisture sensor in a controlled and steady fashion, and return the sampled grain back to the discharge of the dryer.
The Moisture Sensor is an electronic device that measures the grain moisture indirectly by measuring the capacitance of the field of grain and correlating it to a voltage. Additionally, there is a small thermistor, which also produces an analog output voltage, mounted on the face of the sensor to measure the grain's temperature to compensate the moisture reading and to provide a real-time indication of the grain's temperatures. These voltages are input to the PLC and when calibrated, will display the discharge grain moisture as well as the temperature on the HMI touchscreens.
The Discharge Limit Switch is a spring-loaded lever that maintains a normally open contact which is held closed. The purpose of this switch is to detect a discharge grain overload condition that may be a result of a failed discharge auger or takeaway equipment. Once an overload condition exists, the top door on the discharge auger will lift up and the switch will return to its normally open position; in doing so, the safety circuit is opened and the dryer is shutdown.
The Moisture Sampler Auger Motor is a small fractional HP motor that slowly augers a sample of grain past the moisture sensor and returns the sampled grain back to the primary discharge of the dryer.
