![]() We work to lower costs and increase productivity for all of our clients, offering competitive pricing for OEM designs and applications. Need help choosing the right solution for your application? Let SMD Fluid Controls help. There are no moving parts and the option works well because it can measure the presence or absence of many different types of liquid. With optical switches, measurement is done using a laser wave or forward light scattering and a probe. The best option for high viscosity liquids is to opt for non-contact options like optical or ultrasonic level sensors for accurately measuring liquid levels.Īcoustic waves emitted by ultrasonic liquid level sensors and the measuring of the echo returned, make it possible to know liquid levels without ever having to physically touch the matter – eliminating the risks mentioned earlier. The Solution: Optical or Ultrasonic Level Sensors Keep in mind too that temperature conditions can change viscosity levels so be sure you’re selecting a solution that is most compatible with your specific application. Problems including the float getting stuck or even damaging the pressure ports are all possible. When trying to get an accurate measurement you cannot use the same float switches or liquid levels in every situation. To give you a better idea of different viscosity levels or centipoise (cP) measures, water measures at 0.894 cP, castor oil at 650 cP and ketchup at 50,000 – 100,000 cP.Īs you can see the “thickness” plays a major role in how freely these different fluids can flow. Viscosity is used to describe how thick a substance is and defines its ability to change shape under stress or tension. ![]() Is it corrosive? Thick? Hot? These elements can affect how measurements are taken.įor this post, we’ll be focusing on viscosity and how highly viscous (thick) liquids (think oil, paint, molasses) present a unique challenge for measuring. There are, however, some factors to take into account when selecting the proper level sensor or float switch – one of the most important being the type of liquid being measured. Regardless of the application, their ability to measure and identify the presence or absence of a liquid in a vessel is critical. As a rule of thumb, multiply the specific gravity of a liquid by 8.34 to find the weight of a gallon of that liquid.Measuring fluids, and doing so with precision is exactly what float switches and level sensors were created to do. Temperature also changes the viscosity of honey, and heat is often used to make the honey easier to process. If the concentration of water is increased, honey becomes less viscous. In our table below, we have given various liquids' characteristics with the temperature modified to one of more of a real world value. Honey’s viscosity depends upon the amount of water and the type and amount of sugar it contains. You can observe the little balls floating in the tube. ![]() Another version will determine the concentration of anti-freeze in an automobile radiator. This is the same instrument that we use to tell if your automobile battery is fully charged. The float is calibrated to float on fresh water so if the fluid you are testing has a higher specific gravity, the float will raise in the liquid and at a lower specific gravity it will sink lower in the liquid. It consist of a glass cylinder with a rubber bulb on top, and a float positioned inside the glass tube. We measure specific gravity with a hydrometer. The really important thing to keep in mind is that there is no correlation between viscosity and specific gravity. Like specific gravity, viscosity can be altered by a change in temperature, but unlike specific gravity it can also be altered by agitation. Thick liquids are said to have a high viscosity and thin liquids a low viscosity. It is important that you do not confuse specific gravity with viscosity which is a measurement of a fluids resistance to pouring, though there is often what is perceived to be an obvious relationship. As you have already guessed fresh water at 4☌ (39° F) has been assigned a value of one (1). If it sinks into the fresh water the specific gravity is more than one. If the liquid you are comparing will float on this water it has a specific gravity of less than one (1). In relationship to liquids, the term specific gravity is used to describe the weight or density of a liquid compared to an equal volume of fresh water at 4☌ (39° F). Its density is 7.85 grams per cubic centimeter, or 7.85 kilograms per liter, or 7.85 metric tons per cubic meter. If something is 7.85 times as heavy as an equal volume of water (such as iron is) its specific gravity is 7.85. In the metric system specific gravity is the same as in the English system. Specific gravity is the heaviness of a substance compared to that of water, and it is expressed without units. Specific Gravity And Viscosity Of Liquids
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