Regardless of where and for what purpose the pressure measuring instrument is used, it must meet certain performance requirements to ensure the required accuracy of measurements and to be resistant to the effects of the external environment. Specialists say that 66% of the time for the instrument maintenance, consumes her fault to find out the cause.
The pressure is generally one of the major physical parameters of the technological process. In order to ensure process quality, accuracy, control, stability and security in the pressure constant can be measured in the chemical, petroleum, food, wood processing and other branches of industry, transport, thermal and nuclear power industry, automation of technological processes, hydraulics. In practice it is carried out in absolute (in a fully), excess (gauge) and vacuum pressure measurements. SI pressure is measured in Pascals (1 Pa = 1 N/m2). Often the pressure is measured in other units, eg., Technical atmosphere (1 atm), bar (1 bar) of the liquid column height.
German company Ashcroft Instruments GmbH (representative of Lithuania UAB Automation Systems Engineering “) are made of pressure gauges, thermometers, relays, pressure and temperature transmitters, sensors, instrument control and calibration of the centuries occupies a leading place in the market among the industrial measurement and monitoring systems for . The proposed company Ashcroft’s products are of very high quality, operates reliably in all industrial units according to the specified characteristics and are popular and in great demand not only in Europe but throughout the world.
Mass-produced “Ashcroft” brand pressure gauge can measure pressure in various industrial systems with high accuracy over a wide range. These, made from stainless steel, pressure gauge has a long service life while working under the most unfavorable conditions. Manometers implement technical solutions ensure good abrasion resistance of individual components and measuring the speed, offset by the impact of vibration measuring instruments work.
Measuring instruments, gauges
To measure the pressure measuring instrument is different for its intended purpose, method of measurement, design characteristics and can be classified according to many signs. According to the nature of the measured pressure gauges are divided into barometers, manometers, vacuum gauge, traukommetrus, differential and absolute pressure gauge. Barometers measure atmospheric pressure manometers – excess (gauge) pressure vacuum gauge – vacuum pressure, differential pressure gauges – differential pressure, absolute pressure gauges – total (complete) pressure. If one and the same device is intended to gauge vacuum and pressure measurements, it is called vakuummanometru. According to the principle of pressure measurement devices are divided into the liquefaction, mechanical, electrical and combined. Such devices are generally described interval value, absolute accuracy and precision class.
A pressure gauge (from the Greek word mana – loose, uncompressed, rare) – the total of all of the instruments, which allows to control the pressure in the system, the installation site name. Regardless of the structure, all the gauges are analog devices, electronic can only be displayed. According to metrological purpose gauges are divided into technical, control and sample. Technical gauges produced 1.5; 2.5; 4.0 accuracy class control – 0.6; 1.0; Sample – 0.15; 0.25; 0.4. The most common are the technical gauges used in non-aggressive liquids, steam and gas excess pressure of 0.06 MPa to 1000 measurements. It should also be noted that the gauges are divided not only by the principle of operation and use of the area, but also in response to environmental changes of parameters of accuracy, the maximum working pressure, suitability combined with the regulation and control devices, as well as the material from which they are made.
The main structural manometer is a sensing element – the primary pressure transducer. It transforms the pressure on the more convenient to measure the size (shift, turn, strength) or from the pressure change in the primary converter resistance, capacity, inductance, voltage, power oscillation frequency and so on. According to the principle of operation of the sensing element gauges are liquid filled, deformation (mechanical) piston and others.
High-pressure technique measured deformation (mechanical) visual deduction gauges that come with spring and membrane. This type of touchscreen devices element can be a membrane, the spring and bellows. For example, a mechanical spring pressure gauge comprising a body inside which there is a bent hollow tube-spring (Bourdon tube), as illustrated in Figure 1. They closed end over the levers and gears system coupled with an arrow. After connecting the open end of the tube to the point where the measured pressure p, tube-spring deforms (straightens) and rotates counterclockwise, which graduated scale indicates the corresponding pressure. Such devices copper tube without converter functions, performs a kind of a damper role. Over time, the progressive spring element elastic properties change, appears in the device display swings, permanent deformation, wear of the transmission mechanism. Therefore, equipment must be periodically inspected and, if necessary, calibrated.
Liquid-filled gauges used in aqueous medium, has hermetic casing and filled with glycerine, which suppresses vibrosmūgius and reduces the vibrations of the arrow.
In the mentioned fall into many types of gauges used in special cases.
Gauge “Ashcroft T5500 Plus – increased reliability, efficiency and security
So far, environments where high vibration and pressure pulsation used or conventional gauges with hard-determined index position and limited life expectancy, or expensive liquid filled pressure gauges, which also has many disadvantages.
Ashcroft® PLUS! TM technology – it’s dry, but acting as a liquid filled gauges. How is this done? Patented Ashcroft® PLUS! TM technology uses unique cartridge (Fig. 2, EDM), bucket-pinion with retardant material to dynamically suppress arrow fibrillation, and filled with dry gauge acts as a fluid-filled.
Dry anti-vibration gauge Aschcroft T5500 Plus – technology designed to solve the vibration problems. Ashcroft® PLUS! TM technology improves safety and saves money, dry Ashcroft® PLUS! TM manometers easier to standardize, in fact they act as a fluid-filled pressure gauge. This technology allows you to save 20-30% of the funds each year, reducing the use of incorrect gauges also reduces leaks, equipment damage or risk of damage.
Pressure gauge with Ashcroft® PLUS! TM technology, fields of application and advantages over conventional manometers shown in Table 1.
Recommendations gauges selection
And the pressure gauge installed in the boiler house apartment, and gauge the nuclear power plant, has a flawless work and be accurate: even a small error can lead to serious consequences, eg., A fire or explosion.
Buy a pressure gauge is not a problem if the buyer knows exactly what purpose it will be used, what pressure will need to measure the range of what must be a measuring device operating characteristics. Pressure gauges, as well as any other precision instruments, must be purchased in specialized stores, giving priority to those sellers who won the construction, repair and maintenance organizations in the trust.
In order not chosen wrong, there is no need to delve into the technical details, it is sufficient to know the gauge measuring range, the shell diameter, accuracy class, connections thread and location, if there is corrosion of a likelihood of whether a vibration, hammering, overloading under pressure, the process and the environment and its temperature changes.
Already today it is possible to acquire reliable and durable manometers, requiring special care.
If you are not sure what will work best for you gauge – contact us UAB Automation Systems Engineering. To get acquainted with the available models and their differences, will advise you to choose the best.