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HOW TO USE A SALOMETER A salometer is a hydrometer that measures the density of a sodium chloride brine using a scale marked for percent of saturation, 0S to 100S. A 70S brine, for example, is 70% of fully saturated brine, which at 60F would contain 1.75 lbs. of NaCl/gallon with a specific gravity of 1.139. There are different types of salometer scales. Some are based on a different saturation point, with 100S representing 25% NaCl rather than 26.4%. Most are calibrated at 60F but some are intended for cooler temperatures such as 38F. Proper procedure for taking a salometer reading are: 1. Start with a clean, straight-walled glass cylinder with a diameter at least twice that of the salometer bulb with sufficient height to allow for complete immersion of the salometer scale. The cylinder should be tall enough to allow the salometer to float at a 0S reading. 2. Place the cylinder on a level surface and fill with a sufficient volume of brine to raise the liquid level near the top of the cylinder after the salometer is immersed. 3. Record the brine temperature. If significantly different than 60F, a temperature correction to the reading will be necessary (see chart). 4. Carefully immerse a clean, dry salometer in the brine. Assure that the salometer is floating and not touching the cylinder walls. After the salometer has stabilized, take a reading at the brine surface at eye level at the bottom of the meniscus, the concavity formed on the cylinder walls at the brine surface (see appendix B for diagram). 5. Check new salometers by first placing them in clear water, where the reading should be nearly 0S at 60F. Empty the cylinder, rinse it with saturated salt solution and then refill BRINE TABLES with saturated brine at 60F. The reading should be near 100S and not less than 98S. When sodium chloride brines are tested at temperatures other than 60F (15.5C), the recorded correc- tions in the chart below should be applied to readings before entering the salometer chart (opposite page). Extrapolate correction values for intermediate salometer readings and temperatures. Salometer Correction (0S)* Variation of Solubility Temperature of Brine NaCI Saturation Brine 00 F 200 F 400 F 600 F 800 F 1000 F Temp % Wt. Salometer 0 0 0 0 0 0 0 0 g/L Water -18 C -7 C 4 C 15.5 C 27 C 38 C F ( C) Brine Reading 1000 - 7.2 - 4.8 - 2.4 0 + 2.7 + 5.4 0 (-18) 313 23.83 800 - 6.7 - 4.5 - 2.2 0 + 2.6 + 5.1 21 (0) 356 26.30 600 - - 4.1 - 2.0 0 + 2.4 + 4.7 40 (4) 357 26.33 400 - - 3.5 - 1.7 0 + 2.1 + 4.1 60 (15.5) 359 26.40 200 - - 2.6 - 1.3 0 + 1.6 + 3.3 80 (27) 361 26.67 00 - - + 1.0 0 + 1.2 + 2.4 100 (38) 364 26.68 0 *Below 60 F, subtract correction from salometer reading. Above 600 F, add correction to salometer reading. Orders or questions? Call (800) 241-7951 or (706) 864-3773 | www.polyportables.com ;