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NIR Moisture Gauging provides Energy Savings & Increased Production Volume for Potato Dehydrators  

Ideally potatoes chosen for processing should have a high specific gravity/ percent solids as this will minimize the volume of water that needs evaporating, but the reality is that these potatoes are frequently selected for the production of chips and French fries leaving a mixed feed stock for the dried potato manufacturers to work with. Dryers are typically set up to ensure that the wettest of product is dried sufficiently for shipment, but this results in over drying the bulk of the product costing the processor twice; in terms of unnecessary energy usage and in lost sales volume.

Dehydrating Process
Potatoes are cleaned, skinned, sliced, blanched, cooled, washed and steam cooked for 15 minutes to an hour depending on the % solids, prior to drum drying(dehydration).

Measurement Location & Gauge Installation
The MCT NIR gauge is typically located above the collection conveyor for the potato flakes that peel off the drum. NIR is a surface biased measurement. In order to obtain representative gauge readings, the gauge should be viewing a minimum bed depth of 0.5” of well mixed product.

Measurement Performance
Measurement Location Target % Typical Accuracy%
Moisture in potato powder/ flakes Exit of drum dryer 5.5% +/- 0.3%

Measurement Justification
Owing to the large variance in the % solids of the incoming potatoes, a moisture swing of +/- 3% in product exiting the dryers is not uncommon if the dryers aren’t automated. With Process Sensors NIR meters, moisture can be continually measured and the information used in a feedback loop to control the drum speed of the dryer. The uncontrolled +/- 3% swing can be reduced to +/- 0.5% . With moisture variation minimized, the moisture set point can be raised resulting in increased production volume and reduced energy costs.

Application Photos
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Moisture Transmitter
Tobacco Moisture Transmitter
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Process Sensors Corp.
113 Cedar Street
Milford, MA 01757 USA
Tel: (508) 473-9901
Fax: (508) 473-0715
Process Sensors Europe
Unit 4, Adelaide House
Corbygate Business Park
Corby, Northants NN17 5JG
United Kingdom
Tel: 01536-408066
Fax: 01536-407813
Process Sensors Polska
Ul. Modlinska 310/312 lokal 216
03-152 Warszawa
Tel: (48) 22 6739526
Fax: (48) 22 6739527
Gsm: (48) 509 202759
Process Sensors Asia
PT 3852 Taman Binaraya 3
Off Jalan Pasir Puteh
Limbat, 16150 Kota Bharu Kelantan, Malaysia
Tel: 00-609-765-1352
Fax: 011 60 6601 4588
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  Process Sensors Moisture Transmitters

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