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QC Sop Booklet-3

The document outlines procedures for weighing and disposing of grain at the depot, including the retention of sample slips after analysis. It details the instruments required for sampling and analysis of cereals, pulses, and milled products, referencing IS standards for proper usage. Key instruments mentioned include various types of samplers, sample dividers, and analysis tools such as physical balances and sieves.

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51 views1 page

QC Sop Booklet-3

The document outlines procedures for weighing and disposing of grain at the depot, including the retention of sample slips after analysis. It details the instruments required for sampling and analysis of cereals, pulses, and milled products, referencing IS standards for proper usage. Key instruments mentioned include various types of samplers, sample dividers, and analysis tools such as physical balances and sieves.

Uploaded by

ajaysalunke8482
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© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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This grain shall be weighed on receipt at the depot and taken on the ledger and

issued/disposed in accordance with disposal instructions.


4. Samples of Mandi purchase operations will also be disposed of after analysis, in the
normal manner.
5. Though sampled grain may be disposed of after analysis, sample slips will be retained
and destroyed only with orders from competent authority.

Instruments required for sampling & analysis: [IS 14818: 2000]


A. Instruments required for Sampling of cereals/ pulses/ milled products:
1. Instruments for sampling from static bulk, bins & rigid containers: There are various
types of instruments for sampling from static bulk, bins and rigid containers. For
details, please refer IS 14818: 2000.
2. Instruments for sampling from stacks and bags including bulk bags: These include:
a. Dynamic sack spears
b. Walking stick type (open handle or with compartment)
c. Conical samplers
d. Gravity spears
e. Screw augers

(For details, please refer IS 14818: 2000)


3. Sampling with ‘Parkhi’: [IS 2816: 1964 (R 1994)] In FCI, ‘Parkhi’ is commonly used
for sampling. Parkhi shall be inserted in the bag in a diagonal position and the
sample is collected by gentle turning and sample are taken out in a plate.
B. Instruments for division of samples: There are various types of instruments for
division of samples. For details, please refer IS 14818: 2000.
i. Coning and Quartering /Quartering iron
ii. Conical dividers (Boerner type)
iii. Multiple slot (Riffle or blade type)
iv. Centrifugal (Rotary divider)

In FCI, most commonly used sample divider is conical divider (Boerner type) and it
should be made available in all QC laboratories.
Conical Sample divider (Boerner type): [IS 4940: 1968]
Conical divider (Boerner type) is the instrument to divide the sample into two equal
half. The divider is calibrated to provide accuracy of 1 % between pans on a 1000 gm
sample. The grain is poured into the hopper and then released down in to the cone
which is directly under the center of the opening. Around the base of the cone are 38
openings or pockets. The grain falling down the sides of the cone is cut into 38
separate streams, rejoining into two streams, which empties into the two pans. Two
equal sub-samples are separated in the bottom receptacles. Sample from one
receptacle is used for duplicate sample. Pour the content of the second receptacle into
the hopper again. Repeat procedures as many times as necessary to obtain the
required weight of laboratory sample.
C. Instruments for analysis of samples:
i. Physical balance: sensitivity should be minimum 5 mg.
ii. Sieves: The following four IS sieves of round holes shall be used:
a. Top 4.00 mm.
b. Second from top 3.35 mm
c. Third from top 1.70 mm.
d. Fourth from top 1.00 mm.
e. A solid bottom pan at the bottom.

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