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1, choice of sort

Selection of instrument kind should meet the needs of production method. One example is, do you will need remote,

Automatic recording or alarm side nature from the medium (if measured temperature, viscosity in the medium size, the degree of corrosion, dirt, flammable, and so forth) are specific demands on the instrument, environmental situations (which include humidity, temperature, magnetic field, vibration, etc) requirements for meter form, and so on. Correct collection of instrument variety based on course of action specifications is always to make sure the instrument performs and an essential prerequisite for safety.

For example the Basic stress gauges with Bourdon tube created of copper alloy (higher alloy steels), while ammonia pressure gauges with Bourdon tube material is carbon steel (or stainless steel), copper alloys are not allowed. Due to the fact ammonia reacts with copper, that explodes, so ordinary pressure gauge cannot be utilized for pressure measurement of ammonia.

Vibration proof diaphragm pressure gauge

Oxygen stress gauge and stress gauge in structure and material could be specifically precisely the same, just oxygen pressure gauge has to be banned oil. Mainly because the oil in to the oxygen method is easy to lead to an explosion. When the oxygen stress gauge in calibration, not as ordinary stress gauge that uses oil as a medium, and stored in oxygen stress gauge must strictly keep away from speak to with oil. If existing oil pressure gauge have to be utilized when measuring the oxygen stress, before use with repeated cleaning of carbon tetrachloride, overview it meticulously till the oil-free so far.

two, the determination of measurement variety

So as to assure the security of elastic deformation of elastic components can reliably operating about, in the option of pressure gauge

When the approach have to be depending on the measured stress from the size and speed of pressure adjust, leave sufficient room for and, hence, pressure gauge upper limit worth really should be higher than the feasible maximum pressure value within the approach. Below the "design technique of chemical control regulations" in the measurement of steady stress, maximum functioning stress should not exceed the upper limit value measurement two-thirds; measuring pulse pressure, maximum operating pressure must not exceed the upper limit worth measurement one-second; measuring pressure, maximum functioning pressure should not exceed the upper limit worth measurement of three-fifths. Basic test pressure shall be not less than the minimum values instrument measuring ceiling values of one-third. So as to make sure that instruments of linear connection involving output and input

Standard diaphragm pressure gauge

Based on the maximum and minimum values on the measured parameters to calculate upper and lower limits with the instrument, not only numerical straight immediately after, as the measurement selection of the instrument. When we have been inside the instrument's ruler decision limits values need to be selected within the series of standards prescribed by the State. China pressure gauge measuring range typical series are: -0.1-0.06,0.15;0-1,1.six,two.five,four,six,10X10 "MPa (exactly where n could be the organic integer. for constructive and negative values).

3, precision grade choice

According to the technology to generate the maximum absolute error and permitted chosen instrument drive, to calculate the instrument allows the maximum referral error, identified within the national delivers the accuracy level meter accuracy. Generally speaking, the instrument chosen by the a lot more sophisticated, the additional precise and trustworthy measurement final results. But chosen instrument precision cannot be regarded as the larger the far better, for the reason that the extra precise instrument is usually more highly-priced, operation and upkeep of extra difficulty.

Chosen examples:

Flange type diaphragm pressure gauge

1, applied for measuring viscous or special media which include acids and bases, and must use a diaphragm pressure gauges, stainless steel

Bourdon tube, movement, stainless steel case stainless steel, or bakelite case.

According to the media measurement, colour-coded around the pressure gauges must be supplied, and indicate the name of the unique media and oxygen form should be marked having a red "no oil" words, hydrogen line by way of his dark green color, ammonia low line in yellow colour, and so on.

2, against the wall when installed, need to opt for the side pressure gauge when installed straight on a pipe ought to be chosen without having stress on the edge in the table; when made use of for direct measurement of gas need to be applied behind the casing pressure gauge with security holes. For stress measurement place and convenient to observe management considerations, case diameter size should really be chosen.