Using the Grass Compression Gland with corn


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The Grass Compression Gland can be used to seal corn or “maiz” leaves also. When testing young corn leaves they might pass through without any effort or modification of the leaf. The leaf cannot exceed 3/4” wide.

As the leaf matures and becomes too wide to sample the whole leaf it is best to switch to this method as described below.

Using the Grass Compression Gland with Corn PMS Instruments

Select a fully shaded leaf that is in the best condition (least amount of bug holes or any kind of disease).

Using the Grass Compression Gland with Corn PMS Instruments

Slide a plastic bag over the leaf as far as you can get it down in the bag. It can be slightly rolled at the bottom of the bag.

Using the Grass Compression Gland with Corn PMS Instruments

Use a knife or scissors to make a straight and clean cut across the leaf.

Using the Grass Compression Gland with Corn PMS Instruments

The sample should look like this now.

Using the Grass Compression Gland with Corn PMS Instruments

Pull down each side of the corn leaf so that the center rib is isolated and does not exceed the maximum width of the seal.

Using the Grass Compression Gland with Corn PMS Instruments

The sample should look something like this.

Using the Grass Compression Gland with Corn PMS Instruments

Push the end of the leaf through the grass seal so that it just passes through the lid.

Using the Grass Compression Gland with Corn PMS Instruments

Twist the Compression Ring to seal the sample into the lid.

Using the Grass Compression Gland with Corn PMS Instruments

Put the leaf and bag all together into the chamber.

Be sure the leaf is all the way in the bag and that the bag does not get caught on the chamber O-Ring.

If the bag or leaf is caught on the O-ring it will leak during the pressurization of the chamber.

Using the Grass Compression Gland with Corn PMS Instruments

Begin to pressurize the sample at a rate of about 1 bar every 2 seconds.

Using the Grass Compression Gland with Corn PMS Instruments

Watch for the end-point. You will see water come out across the whole width of the cut sample.