How To Selecting A Pressure Gauge
Adequate safety results from intelligent planning, careful selection and installation of gauges into a pressure system. The user should inform the supplier of all conditions pertinent to the application and environment so the supplier can recommend the most suitable pressure gauge.
The pressure sensing element in most pressure gauges is subjected to high internal stress, and applications exist where the possibility of catastrophic failure is present. Pressure regulators, chemical seals, pulsation dampeners or snubbers, siphons, manifolds and other similar items are available for usage in these potentially hazardous systems.
The potential hazard increases at higher operating pressure.
Introduction of Tire Pressure Gauge
Properly inflated tires can help to save gas and ensure better handling from your automobile, so it is important to keep the pressure of the tire at the optimal amount. The tire-pressure gauge is a primary tool used to check and measure the pressure in pneumatic wheel or tire, so that you can keep your tire pressure in the right situation. When the tire gauge measures the air pressure, the results are usually read in PSI(Pounds per Square Inch). Automobile tires have recommended PSI levels imprinted on the tire itself and included on a chart inside the driver's side door panel. After a tire gauge is read, the PSI number is compared to the tire manufacturers' recommended PSI and compressed air may be added until that ideal pressure has been reached. Underinflated tires can cause poor fuel efficiency and an increased chance of tire failure. Overinflated tires can lead to dangerous blowouts and a noticeable loss of handling.
A commercial tire gauge comes in different forms. One of the most popular types resembles a ballpoint pen, complete with a clip for shirt pockets. On one end of the tire gauge there is a rounded tip with a small opening and a post in the center. This tip fits snugly over the inflation valve of a standard tire. As the user depresses the tire gauge over the valve, some air might escape from the tire. This shouldn't affect the actual reading much, but a good airtight seal is important. On the other end of the pen-style tire gauge is a square opening which houses a plastic tube. On the side of this tube are calibration marks which denote pounds of air pressure. The air escaping from the tire valve forces the plastic tube out of the housing at a predetermined rate. Once the tube has stopped moving, the user can look at the last visible calibration mark to determine the tire's current PSI level.
Another type of tire gauge is attached to a commercial air compressor at service stations. Customers can check each tire's PSI readings for free by connecting the compressor hose to each valve stem. A metal tube performs the same measurements as the plastic version, with a spring to return it to the housing between readings. If a tire is found to be low in pressure, the customer can activate the coin-operated compressor and add more air. The attached tire gauge can be used at any time to measure the process.
When you use them to measure your tire's pressure, you can follow these simple steps:
1.Make sure the tires are cool, meaning they are not hot from driving even a mile.
2.Remove the cap from the valve on one tire, then firmly press the tire gauge onto the valve and measure the pressure.
3.Add enough air to reach the recommended air pressure.
4.Replace the valve cap.
5.Repeat this procedure for each tire, including the spare.
6.Visually inspect the tires to make sure there are no nails or other objects embedded that could poke a hole in the tire and cause an air leak.
7.Check the sidewalls to make sure there are no gouges, cuts or bulges.
Keeping tires properly inflated is something every driver must learn to do. It is especially important to check your tires before long trips and during extremely hot weather. Periodically check your spare tire's air pressure and any other vehicle which uses pneumatic tires. The tire pressure gauge will let you know your tires’ pressure after you have the tire pressure gauge connected with the tire valve. This will also inform you whether the tires still need more air or not. In case more air is still needed, do again the procedure, this time carefully, so that air limit will not pass. In case tire pressure is correct, simply disconnect the air pressure gauge from it and screw the valve cap back in its place.
The Working Principal of Tire Gauges
There is a myriad of shapes, sizes, and costs to consider when shopping for a gauge, however, they all boil down to 3 basic types. The dial, digital, and stick. The gauges may look different, and display results differently, but all use the same principal. When the gauge is pressed onto the stem of a wheel, the air pressure in the tire pushes against some type of plunger which in turn actuates the readout section of the gauge assembly. Here are some similarities and differences of this three types.
The first and most common gauge is the stick type, also known as the pen type. It consists of a metal or plastic casing, a pocket clip and a deep set chuck, usually with a pressure release bump on the opposite side. On the air input end is a ball or tube shaped body that presses onto the wheel stem. Inside the opening of this ball is a centered pin. This pin pushes against the pin in the valve stem to open the valve, letting air into the gauge. The gauge’s pin is surrounded by rubber to seal the gauge to the valve stem. The gauges long metal tube is lubricated with light oil, and contains a rubber piston that is forced away from the air input end when the gauge is pressed onto the valve stem. The piston is pushed in direct relation to the air pressure coming from the tire. The piston is pushed against a spring that is calibrated in such a way that a certain amount of air will compress it a certain amount. The spring is wound around a stick or rod with gradations printed on it. When the piston pushes the spring and the rod, the rod is pushed out the end of the gauge by a calibrated amount. The user then simply reads the number on the rod. The rod is not connected to the spring or the piston, so when the gauge is removed from the valve stem, the spring returns the piston to its starting point, but the rod stays where it is until the user pushes it back into the body of the gauge. The rod is larger in diameter inside the gauge, so as not to be shot out the end of the tube.
The second type of gauge is the dial type. It consists of a protective casing around a dial indicator with a pressure scale on the dial background. An air chuck is attached to the dial either rigidly or with a section of flexible tubing. These gauges are easier to read, but more expensive and less robust than the stick variety. In this gauge, air from the tire enters a C-shaped tube inside the gauge. The air forced into the tube causes it to uncoil, much like a party noisemaker. The end of the tube is connected to an indicator needle by a series of levers and springs. When the tube straightens out, the needle deflects accordingly. Almost all dial gauges have an air bleeder valve; if the air pressure is too great in the tire, hold down the button and air will be released until the desired pressure is achieved.
The third type is the digital tire gauge. It consists of a protective casing around some form of digital readout with the necessary electronics to drive the readout. An air chuck is attached to the casing either rigidly or with a section of flexible tubing. These gauges are the easiest to use, they have a direct LCD readout, and some even talk! These gauges use an electronic component known as a strain gauge. Air from the tire goes into the body of the gauge, where it pushes against the strain gauge. The resultant flexing of the strain gauge changes its resistance. This resistance change is input to a microprocessor where the resistance change is converted to a binary signal used to drive LCD readout. These gauges come in a variety of shapes and sizes, are very accurate and very durable.
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Rising Instrument Co., Ltd.
Add: #4-8, Shijilongteng Bldg, No.269 Zhongxing Road, Ningbo, 315040 P.R.China
Tel: +86-574-87787718/87787728 Fax: +86-574-87787708
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