# Advice 1: How to check the gauge

To gauge correctly measured pressure without distorting information, it should be checked regularly. To determine the correct readings at the appearance of this device is almost impossible. To do a background check, cross-check its readings with the gaugeω, which shows a known accurate readings, or calculate the pressure of the gas, and then measure it with a gaugeand check the readings.
You will need
• the reference pressure gauge and thermometer
Instruction
1
To check the pressure of the gas in the tank, install sensor, pressure gaugeand it. To do this, as a rule, there are special fittings. When the value is locked, remove the manometerand install it in place of the reference device. By comparing the readings simple and standard gauges, check the correctness of the readings. If the readings do not coincide with the reference pressure gaugeohms, adjust it to the same conditions gauges showed the same results.
2
To configure on the casing pressure gaugeas a rule, includes adjusting bolts. With electronic pressure gaugeω the algorithm of actions is the same, just keep in mind that this device has inertia, so the readings need to hold 8 to 10 seconds.
3
If no reference gaugeand air the correct readings of the pressure gaugeand the previously calculated pressure. To do this, take a vessel of known volume. The air in it is at atmospheric pressure, which can be measured using the barometer, and the temperature is room. Then, seal the container, and begin heating it by controlling the temperature and pressure, which is expected to increase. Calculate the pressure inside the container, dividing the end temperature in the initial. Then multiply the result by the value of atmospheric pressure. P2=T2•P1/T1.
4
If the readings of the manometerand at a given temperature does not coincide with the previously calculated, adjust it so that it showed as much as happened in the calculation. When making calculations, consider that the temperature is measured in degrees Kelvin, for which the Celsius add the number 273. Dial gauges as a rule, is graduated in kg/cm2, the calculation will be derived in Pascals, or millimeters of mercury, so you need to translate it the same unit and then compare.

# Advice 2 : How to choose a pressure gauge

On the market of measuring instruments is represented by a large number of different types and models of gauges. As devices for measuring the pressure of liquids and gases, pressure gauges are widely used in various technical systems. Not to be mistaken in the choice of device, you need to imagine for what purpose you need it.
Instruction
1
Determine the type of device that you require. To measure pressure are actually used pressure gauges, pressure-vacuum gage, vacuum gauges and low-pressure devices. Most of them are intended for measuring of excess pressure in special conditions. Devices of the same type are usually made on a common standard, therefore interchangeable.
2
Find out what range of pressure will operate the device. This will require data on the operating pressure in the system which will serve the manometer, and about the range of possible values. To operating pressure add 25-30% and you will get the desired characteristics, which must comply with the gauge you purchase.
3
Consider the nature and characteristics of the environment in which you must work the device. It can be air, water, steam, oxygen and its variants, acetylene. In such cases, you will need technical gauges.
4
Buying a device for measuring the pressure in the oxygen, be aware that the oxygen pressure is more capricious and require additional care and maintenance (degreasing). In some cases, the pressure measurement can be carried out in aggressive environments (ammonia, chlorine and so on); for such conditions will need special devices that are resistant to environmental conditions.
5
Determine the required diameter of the housing of the measuring device. If the conditions allow to get close to the gauge at a safe distance, install the pressure gauge medium in size. Relative inaccessibility is more convenient to take readings from a device having substantially larger diameter. The diameters of the devices range from 40 to 250 mm.
6
Each device for measuring the pressure also has the class of precision: from 0.15 to 4. The smaller this index, the more accurate the device. Choose the required accuracy, in accordance with the features of the system to be controlled. Does not make sense to acquire high-precision pressure gauge, if the pressure can vary quite widely. High accuracy, typically required when conducting some research work.
7
If you plan to use the pressure gauge on the specialized manufacturing (e.g. food industry), then you probably need a device with separators of environments. For precise selection, please contact for advice to professionals, specifying the type and characteristics of the environment in a particular industry.
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