How many proweigh filters (pack of 100) are in 1 carton?

One box of this product will come with 100 filters.

Is the ProWeigh software required to use the scanner/barcodes? May we scan the barcodes and upload info into our own excel spreadsheet?

No special software is required to read the barcodes. The barcode contains the ID number and tare weight of the filter separated by a space. A standard scanner can read them and import them to spreadsheets.

Does it matter what side of the filter (grid or smooth side) is placed down on the vacuum pump apparatus while filtering?

The “gridded” side of the filter should be placed down. The “wrinkled” side should be facing up.

What is the pore size of these filters?

These filters have a nominal pore size of 1.5 microns.

Should the filters be placed in desiccators once the package is opened?

These filters are ready-to-use right out of the box. They do not have to be stored in the dessicator.

where do I find the certificate of analysis for a lot number

The only certification available for all of our ProWeigh Filter products is the balance certification. This is available at the following link - http://www.envexp.com/download/techsupport/Certificates%20of%20Analysis/Balance%20Certification%20for%20Proweighs/Current%20Year/Balance%20Certification%202014.pdf

are the pans weighed?

The pans are not weighed. According to the method the pans should only be used as support when drying the filters in the oven. Only the filter and residue should be weighed.

how can I find the certificate of analysis on the proweigh filters

There is no certificate of analysis for the ProWeigh filters. There is a balance certification that is available. Go to http://www.envexp.com/coa and choose \"Balance Certification for Proweighs\" You will be able to download copies of our balance certifications there. We typically have the certification done in May.

What is the nominal pore size of your F93447MM - ProWeigh Filters for TSS, 47mm, 100pk? Thank you, Greg

This filter has a nominal pore size of 1.5 microns.

What would you recommend for zooplankton (copepods) Doubleweigh or Volitile?

If all you need is a preweighed filter, the ProWeigh would be your best option. A representative sample of these filters are double checked for proper weights instead of every filter as with DoubleWeigh. The volatile filters are only for use if the filter and the material on it are to be burned to remove volatile components. All of these filters have a pore size of 1.5 microns.

Why are ProWeigh filters 1.5 um when Standard Methods recommends 2.0 um or smaller?

All of the filters that are recommended by name in the footnote for Standard Methods 2540C have a listed pore size of 1.5 um. The size is slightly smaller than the maximum called for because every type of filter will allow some particles of a larger size to pass through. 1.5 um is a good size to get as close as possible without allowing too many large particles to pass through.

Can the pan ID# and filter weight be put in separate fields on an Excel spreadsheet if read with an imaging scanner?

Yes--this is possible. Customers have been successful in separating the two into different fields on an Excel spreadsheet or in their LIMS system.

Is both the filter number and tare wt included in the bar code information?

Yes--the bar code contains both the filter weight and the pan ID #.

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