Sampling method <Environmental odor>
Since the environmental odor is detected instantaneously and the intensity is fluxional, samples should be collected within 6 to 30-seconds. The equipment used for collecting samples include a handy pump, suction bottle, and vacuum bottle. Let's take a look at sampling methods using these 3 types of equipment.
The equipment most widely used is a handy pump. On some sample collecting sites, this kind of simple equipment can be used. The handy pump is with a replaceable cartridge cast where the gas goes through. With this device we can collect as many samples as we want. In addition, this pump is battery-powered and easy to handle.
Sampling bags made of an odorless material such as polyester are used.Samples should be collected when the odor is most intense; the sampling amount is approximately 10 liters.
Environmental samples are collected at the downwind side on the boundary line. Locate the suction opening at the height of your nose, and wait until you sense the odor. When you detect the target odor intense, open the suction opening and collect the sample.
Sampling Method <Exhaust Port Sample>
There are two types of sampling methods for collecting an exhaust port sample. The first method is called the "direct sampling method," The sample passes directly through the pump. The second method is the "indirect sampling method," The sample does not pass through the inside of the pump.Exhaust port samples differ from environmental samples. The major difference is that the Exhaust post samples have little fluctuation in the concentration of odor; sampling is conducted in1 to 3 minutes.
If you are collecting a sample directly from the exhaust port, make the following preparation. First, insert the sampling tube into the opening.
If you are collecting a sample from an exhaust outlet port, make sure that the sampling tube set near the center of the exhaust pipe. Use the tube and pump, and extract the sample into the sampling bag.
If you are conducting indirect sampling, connect a suction case with a vacuum pump. Use the pump to depressurize the inside of the suction case for sampling. This causes the sampling bag to expand and enables you to collect a sample.next