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One of the requirements for determination of the proper amount of air flow in ASTM D892-01 foam testing is performed with the use of a volume measuring device.
The current specification calls for "the total volume of air leaving the foam test apparatus shall be measured by a volume measuring device capable of accurately measuring gas volumes of about 470 mL."
In most cases it is assumed that there are no air leaks at the connections of the components that make up the "foaming test apparatus".As an optional apparatus, Lawler is offering two "totalizer" models to monitor this specification.
These models are available in either a one channel, FM-21-1 or two channel, FM-21-2, pictured. The dimensions of either of these models are approximately 11"x 8"x 8" deep. They are designed to be either a wall mounted or free standing remote units that are powered by it's own line cord.
These models digitally indicate the "total air volume" flowing through the test assembly used in ASTM D892.
A 1/4" ID flexible tube from the air-outlet tube is all that is needed to connect to the hose barb of the totalizer. As the air flows through the test assembly the "total" volume is digitally displayed. On completion of the test a reset button is manually actuated and clears the totalizer reading and it is ready for the next test.
This "totalizer" will ensure that there were no leaks and that the volume of 470 mL of air required to flow through the foaming test apparatus was completed.
Totalizers are also available for new apparatus and incorporated into the main cabinet.
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