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English 30 Public

grade 12

Study Slideshow

What will the understanding of samples involved tell you?

1- You can assemble the appropriate equipment. 2- Understand OHS considerations. 3- Ensure that you know what you are going to do and how you are going to do it

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You may be issued with work sheets that detail what is to be measured and for recording of the results. The sheets will normally show:

▪ Samples required ▪ Sites for the collection of the samples ▪ Instructions relating to the samples ▪ Specific safety instructions regarding things like lockout

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Priority: sometimes you will be given a list of different site samples for the day. These may include Why are you taking the sample?

false /Purpose:

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Sampling is an important part of the company’s quality control program. Before you begin you must be able to answer questions such as:

• When do I take a sample? • How much sample is required? • Which products/batches are being sampled? • What equipment do I need? • How will I take the sample?

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Sampling plans Sampling plans are written to meet:

• The demands of site geography • Government and industry regulations • Your company’s requirements.

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A good sampling plan covers:

• How often to sample • The size of the sample • How the sample is to be taken • How you choose items to sample.

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Selecting items to sample We can sample:

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Randomly ?

The sample is simply selected at random. If bags of sand are being tested, one bag is chosen off the stack and some of the sand removed. Many sampling programs

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By Judgement

Personal knowledge and judgement are used to choose the sample.

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• By Cluster

Divide what is being sampled into areas (or clusters), then choose one of the clusters at random. This is useful in storage areas such as the cold room where th

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Systematically

Samples are taken at regular intervals. This can be done by number such as every tenth production item, or by time, such as a sample taken every two hours. In a

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The containers used to capture gases can be:

1. Flexible bladders similar to plastic and foil wine cask liners 2. Rigid walled containers made of plastic, metal or glass. These may contain absorbent materi

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example of pure liquids:

such as water, liquid oxygen or molten iron

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example of mixtures of liquids,

such as petrol, paint or salad dressing

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example of liquids with dissolved matter,

such as sea water or urine

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example of liquids with suspended matter,

such as blood, milk or sewage

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