Installation
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(green light glows on the panel) and is ready for measuring moisture content of a
new portion of grain.
fig 30. Installation in the output bunker
Not all grain dryer allow installing A315 sensors in the described manner. In
case grain is unloaded from the bunker in small portions, the most accurate meas-
urements can be demonstrated when using small flexible spiral screw conveyor
mounted below moisture sensor (fig. 31).
fig 31. Instation with a sampling conveyor
Part of grain flow from the unloading conveyor passes through DN60 (60 mm)
pipe to the measurement channel. Spiral screw with the same diameter (DN60) is
mounted below the sensor. The screw is driven be electric motor reducer rotating at
the speed of 1-2 RPS (60-120 RPM) and slowly conveying grain passing through the
moisture content and returning it to the main flow. When this method of installation is
used, the grain flow through the sensors should be interrupted for 20-30 seconds
every 30 minutes in order to initiate automatic calibration of sensor. After interruption
of grain flow the sensor shall read zero moisture value and green light shall glow
on the panel indicating its readiness for the new portion of grain.
