Ankom Delta, Руководство оператора

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Operator’s Manual
Rev 4/24/20
pg. 25
Crude Fiber Analysis
Crude Fiber Calculation
Crude Fiber contained within a food or feed sample can be calculated using the following formula:
% Crude Fiber = 100 x (W
3
– (W
1
x C
1
))
W
2
Where: W
1
= Bag tare weight
W
2
= Sample weight
W
3
= Weight of Organic Matter (loss of weight on ignition of bag and fiber)
C
1
= Ash corrected blank bag factor (running average of loss of weight on
ignition of blank bag / original blank bag)
Crude Fiber Sample Preparation Procedure
To prepare samples for fiber analysis, follow the procedure detailed below.
IMPORTANT:
When using the ANKOM
DELTA
Automated Fiber Analyzer for Crude Fiber
analysis, at least one blank filter bag should be included with the sample set
as an indicator of particle loss. A running average of the blank bag weights is
used in the fiber calculation as the C
1
correction factor. A C
1
value larger than
1.0000 indicates that sample particles were lost from filter bags and deposited
on the blank bag. Any fiber particle loss from the filter bags will generate
erroneous results. If particle loss is observed, the grinding method for the
specific sample should be evaluated.
1. Using a Solvent Resistant Marker, number all of the filter bags you will use during
the fiber analysis.
2. Weigh and record the weight of each empty filter bag (W
1
).
3. Set the Heat Sealer dial to between 4 and 5. (The setting may vary from sealer to
sealer.)
4. Seal at least one empty filter bag (to be used as a blank) within
4mm of its open end. Keep the sealer arm down for 2 – 3
seconds after the red sealer light turns off (to cool the seal). The
seal can be seen as a solid melted stripe along the top edge of
the filter bag (as shown to the right). If the seal is not strong, re-
seal the bag.
5. Place an empty filter bag in the Bag Weigh Holder in an open position.
6. Tare the weight of the empty filter bag and the holder together.
7. Add 0.95 – 1.00g of sample to the filter bag. Keep all particles away from the sealing
area of the filter bag.
8. Record the weight of the sample (W
2
).
Seal