TL;DR
Moisture overshoot over-dries grain and wastes fuel. Check the moisture sensor calibration, reduce the discharge speed, and verify the temperature setpoint against the incoming grain moisture.
What you might see
- discharge grain moisture below the target by more than 1%
- energy consumption per tonne increasing
- grain cracking or stress fractures increasing
- discharge temperature rising above setpoint
Likely causes
Moisture sensor calibration drift causing the dryer to see a higher discharge moisture than actual
Incoming grain moisture lower than the setpoint basis, requiring less drying time
Discharge speed too slow relative to the current grain moisture removal rate
Dryer temperature set higher than needed for the incoming moisture and ambient conditions
Required tools
- Calibrated portable grain moisture meter
- Dryer control panel access
Safety first
- Grain dryers operate with open flame or electric heat elements. Follow all fire safety and lockout procedures before opening any burner or heat element access.
- Grain dust near dryer exhaust points is a fire hazard. Maintain clear separation between grain dust and ignition sources.
Procedure
- 1
Collect a grain sample at the dryer discharge and measure moisture with a calibrated portable moisture meter. Compare to the dryer's onboard sensor reading.[1]
- 2
If the portable meter reads lower than the dryer sensor, the sensor is reading high. Offset the sensor calibration per the dryer control manual.
- 3
Check the incoming grain moisture at the dryer inlet. If incoming moisture is lower than the recipe basis, the dryer is removing more moisture per unit time than needed.[1]
- 4
Increase discharge speed by 5% increments and resample discharge moisture after each change. Allow at least 10 minutes to stabilize before sampling.
- 5
Reduce dryer temperature if the incoming moisture is consistently lower than the design basis for the current setting.
- 6
Verify the ambient temperature and humidity. Cold dry conditions dry grain faster than warm humid conditions at the same temperature setpoint.
- 7
Log incoming moisture, discharge moisture, temperature, and discharge speed for the run to refine the recipe for future batches of similar grain.
Sources
GSI (AGCO) GSI X-Stream / Topdry Grain Dryer general technical documentation, GSI (AGCO)
Grain dryer moisture control and sensor calibration, general grain drying practice (general)
More guides for GSI (AGCO) GSI X-Stream / Topdry
How to diagnose a burner that will not ignite on a GSI X-Stream Grain Dryer
Burner ignition failure stops drying. Check the gas supply pressure, igniter spark, and flame sensor before calling for service.
How to respond to high plenum temperature on a GSI X-Stream Grain Dryer
High plenum temperature risks grain scorching and bin fire. Immediately reduce burner output, increase airflow, and check for obstructed airflow paths before resuming normal operation.
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