Weight per Gallon Cups

Transcription

1 Measure what you see. Weight per Gallon Cups Operating Instructions A member of Additives & Instruments

2 Weight per Gallon Cups Operating Instructions English PV-9654 PV-9664 PV-9659 PV-9655 PV-9658 BYK - Gardner USA 9104 Guilfd Road Columbia, MD USA Phone Fax BYK-Gardner GmbH Lausitzer Str. 8 D Geretsried Germany Tel gardner ( ) Fax

3 Description Description The BYK-Gardner Weight Per Gallon Cup is a simplified fm of pycnometer specially designed to measure the density of a fluid at a standard temperature of 77 F (25 C). The net weight of the air-free sample is determined to the nearest 0.1 gram, and converted by simple facts to either density (pounds per gallon) specific gravity (density relative to water). These crosion resistant stainless steel cups are available in 3 sizes: Regular, Midget and Imperial. 2

4 Operation Operation 1. Mix the material thoughly befe pouring a representative sample into the cup. Fill the cup until the liquid level is just below the rim at 25 C other agreed upon temperature. Avoid trapping air bubbles in the sample. 2. Place the perfated lid on top of the cup and seal it with a careful twisting motion. An excess of the liquid should ooze (not squirt) put of the small hole on top of the snugly fitting lid. Wipe off this excess material, using a soft cloth tissue paper. 3. Weigh the properly filled cup, (usually to the nearest 0.1 gram), on an appropriate labaty balance. A tare weight is available with the 3 sizes of cups. It can be used as a counterpoise to determine rapidly the net weight of the sample when an evenarm trip balance is used. The weight of the tare equals the exact weight of the empty cup and its lid. 4. Using the net weight, compute the pounds-pergallon density the specific gravity of the sample by the following methods. Calculations: The Regular Cup contains 83.2 grams of water at 25 C. The net weight in grams of the fluid sample is divided by 10 to obtain the weight in pounds per U. S. Standard Gallon. This weight per gallon is multiplied by 0.12 to obtain a specific gravity the net weight of the cup can be divided by 83.2 f a direct conversion to specific gravity. The Midget Cup has a capacity of 8.32 grams of water at 25 C. The net weight of the fluid sample in grams equals the sample s density in pounds per U. S. gallon. To obtain specific gravity, multiply pounds per gallon by 0.12 divide the net weight of the cup by

5 Operation Determination of Density and Specific Gravity The larger Imperial Cup contains grams of water at 25 C; the net weight in grams of the fluid sample is divided by 10 to obtain the weight in pounds per British Imperial Gallon. This weight in pounds is multiplied by 0.10 to obtain the specific gravity the net weight of the cup is divided by 100 to obtain this figure directly. Density (lbs./gal.) Specific Gravity (relative to water) Regular U.S. Cups g of sample x 0.1 lbs./gal. x 0.12 g of sample + 10 g of sample x Midget Cups g of sample lbs./gal. x 0.12 g pf sample x 0.12 Regular Imperial Cups g of sample x 0.1 Ibs./gal x 0.10 g of sample + 10 g of sample x 0.01 Imptance of Temperature Control: All weight per gallon cups are calibrated with distilled water at the facty befe shipment so that the crect net weight of water is retained in the cup at the prescribed temperature of 77 F (25 C). This same standard temperature is recommended when using these calibrated cups. Volume expansion contraction of both the cup and sample will cause errs if the temperature is not kept under control. In determining an absolute density value both the cup and its contents must be brought to the standard calibration temperature of 77 F 4

6 Operation 25 C. However, in determining the relative density values between different samples, all that is necessary is that the cups and its contents be brought to the same temperature befe weighing. NOTE: F additional infmation regarding density measurements, refer to ASTM D 1475, Density of Paint, Varnish, Lacquer and Relative Products. 5

7

8 EDFIS 0408 Europe