Gravimetric Cassette and Filter Paper. TSI Quest Quest Environmental Monitor EVM Series, EVM-7

117 Gravimetric Cassette and Filter Paper

Impactors and When To Clean

Impactors and When To Clean

When the dust accumulates on top of impactor plate in a pyramid form (as displayed in the figure below), this signifies the impactor plate requires cleaning.

For example, in a dense, dusty manufacturing plant, this may require greasing and cleaning after each measurement or every 10 hours of measuring.

Apply a very thin-film of silicone grease before calibrating and measuring (on the appropriate impactor setting.)

When dust accumulates in a pyramid form on top of the impactor, this indicates cleaning is required.

Figure 7-9: When to clean impactors

Gravimetric Cassette and Filter Paper

A filter paper in the gravimetric cassette (also referred to as “gravimetric pump protection filter”) is userreplaceable and is included in your kit. It is suggested to replace the filter paper when the flow rate is not maintained. The instrument will display a warning message when it needs replacing.

 Replacing the filter paper in the gravimetric cassette

1.

Remove the cassette by opening the back door and gently remove the cassette from the housing.

2.

Open the gravimetric cassette by twisting the two pieces apart.

3.

Remove the filter paper and replace it with a new paper.

4.

Put the cassette back together and insert it back into the housing.

 NOTE: When installing the cassette, make sure the side labeled inlet is attached to optical engine. Also the filter paper should be on the bottom of the cassette.

Gravimetric cassette

 Pulls apart into two pieces

Replaceable filter paper

Figure 7-10: Gravimetric cassette and filter paper maintenance

EVM Series User Manual

118 Gravimetric Cassette and Filter Paper

Impactors and When To Clean

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EVM Series User Manual