The main structure of the working principle of hengaode instrument analytical pressure gauge
Pressure gauge (English name: pressure gauge) refers to an elastic element as a sensitive element that measures and indicates a pressure higher than the ambient pressure. It is extremely common in application and it is used in almost all industrial processes and scientific research fields. It can be seen everywhere in areas such as heat pipe networks, oil and gas transmission, water and gas supply systems, vehicle repair and maintenance plants and shops. Especially in the process of industrial process control and technical measurement, the mechanical pressure gauge is more and more widely used due to its high mechanical strength and convenient production due to the elastic sensitive element of the mechanical pressure gauge.
working principle
The pressure gauge passes the elastic deformation of the sensitive elements (Bourdon tube, bellows, bellows) in the table, and then the pressure conversion is transmitted to the pointer by the conversion mechanism of the movement in the table, causing the pointer to rotate to display the pressure.
Main structure
Overflow hole: In the event of an emergency when the Bourdon tube bursts,
The internal pressure will be released to the outside through the overflow hole to prevent the glass panel from bursting. Note: In order to maintain the normal performance of the overflow hole, a space of at least 10mm should be left behind the table, and the overflow hole cannot be modified or plugged.
Pointers: In addition to standard pointers, other pointers are also optional.
Glass panel: In addition to standard glass, other special materials such as tempered glass and non-reflective glass are also optional.
Performance classification: ordinary type (standard), steam type (M), heat-resistant type (H), vibration-resistant type (V), steam vibration-resistant type (MV) heat-resistant vibration-resistant type (HV).
Treatment method: Oil-free / water-free treatment removes water or oil remaining in the wetted part during manufacturing.
Designation of exterior: The color of the shell should be specified in addition to the standard color.
Throttle valve (optional): In order to reduce the pulsating pressure, the throttle valve is installed at the pressure inlet.
Use attention
1. The instrument must be vertical: use a 17mm wrench to tighten it during installation,
The watch case should not be twisted strongly; collision should be avoided during transportation;
2. The instrument should be used in the surrounding environment with a temperature of -25 ~ 55 ℃;
3. Use the working environment vibration frequency <25HZ, the amplitude is not greater than 1mm;
4. Because the ambient temperature is too high during use, the indicator value of the meter does not return to zero or the indication value is out of tolerance. The upper sealing rubber plug of the watch case can be cut to make the inner cavity of the meter open to the atmosphere;
5. The use range of the instrument should be between 1/3 ~ 2/3 of the upper limit;
6. In the measurement of corrosive media, media that may crystallize, and media with high viscosity, isolation devices should be added;
7. The instrument should be verified frequently (at least once every three months), if any fault is found, it should be repaired in time;
8. If the instrument is found to be invalid or damaged due to poor manufacturing quality within half a year from the date of delivery, the company is responsible for repair or replacement;
9. For instruments that measure corrosive media, the requirements should be indicated when ordering
Selection principles
The selection of the pressure gauge should be based on the production requirements of the process and make a specific analysis for the specific situation. Under the premise of meeting the process requirements, it should be considered comprehensively and comprehensively in accordance with the principle of economy. Generally, the following aspects should be considered:
1. Selection of type
The choice of instrument type must meet the requirements of process production. For example, do you need remote transmission,
Automatically record or alarm; whether the nature of the measured medium (such as the temperature of the measured medium, the size of the viscosity, the corrosiveness, the degree of dirt, whether it is flammable and explosive, etc.) has any special requirements for the instrument, and the on-site environmental conditions (such as humidity, humidity, Temperature, magnetic field strength, vibration, etc.) requirements for the type of instrument, etc. Therefore, the correct selection of the instrument type according to the process requirements is an important prerequisite for ensuring the normal operation of the instrument and safe production.
For example, the common pressure gauge spring tube mostly uses copper alloy (high pressure uses alloy steel), while the ammonia pressure gauge spring tube material uses carbon steel (or stainless steel), and copper alloy is not allowed. Because ammonia reacts with copper chemically and will explode, ordinary pressure gauges cannot be used for ammonia pressure measurement.
Oxygen pressure gauges can be identical to ordinary pressure gauges in structure and material, except that oxygen pressure gauges must be oil-free. Because oil entering human oxygen system is easy to cause explosion. When the oxygen pressure gauge used is calibrated, oil cannot be used as the working medium like an ordinary pressure gauge, and the oxygen pressure gauge should strictly avoid contact with oil pollution during storage. If you must use the existing oil gauge to measure the oxygen pressure, you must repeatedly clean with carbon tetrachloride before use, and carefully check until there is no oil pollution.
2. Determination of the measuring range
In order to ensure that the elastic element can work reliably within the safe range of elastic deformation, the pressure gauge is selected
During the process, there must be enough room according to the measured pressure and the speed of the pressure change. Therefore, the upper limit of the pressure gauge should be higher than the maximum possible pressure value in the process of production. According to the "Technical Regulations for Automatic Design of Chemical Industry", when measuring stable pressure, the maximum working pressure should not exceed 2/3 of the upper measurement limit; when measuring pulsating pressure, the maximum working pressure should not exceed 1/2 of the upper measurement limit; When measuring high pressure, the maximum working pressure should not exceed 3/5 of the upper measurement limit. Generally, the minimum value of the measured pressure should not be lower than 1/3 of the upper limit value of the instrument. In order to ensure the linear relationship between the output of the instrument and the input
After calculating the upper and lower limits of the instrument based on the maximum and minimum values ​​of the measured parameters, this value cannot be used directly as the measurement range of the instrument. When we choose the upper limit of the scale of the instrument, we should choose it from the standard series prescribed by the state. China's standard series of pressure gauge measurement ranges are: -0.1-0.06,0.15; 0-1,1.6,2.5,4,6,10X10 "MPa (where n is a natural integer. It can be positive or negative).
3. Selection of accuracy grade
According to the maximum absolute error allowed by process production and the selected maximum range of the instrument, calculate the maximum allowable error of the instrument, and determine the accuracy of the instrument in the accuracy level specified by the country. Generally speaking, the more precise the selected instrument, the more accurate and reliable the measurement result. However, the higher the accuracy of the selected instrument, the better, because the more precise instruments are generally more expensive, and the operation and maintenance are more troublesome.
The company's main stainless steel water collector, tank bottom welding vacuum detection box, reading instrument, eight-level air microbial sampler, dual-wavelength scanner, coating thickness gauge, soil grinder, tempered glass surface flatness tester ,,, Corrosion Rate Tester, Freezing Point Tester, Water Quality Tester, Coating Thickness Gauge, Coating Thickness Gauge, Soil Crusher, Digital Display Thermometer, Gas Sampling Pump, Ceramic Impact Tester, Automatic Crystallization Point tester, drug freezing point tester, reed switch tester, constant temperature water bath, gasoline root rotation, gas sampling pump, tempered glass tester, water quality tester, PM2.5 tester ,,, strain control triaxial instrument, Milk Somatic Cell Tester, Helium Concentration Tester, Soil Moisture Conductivity Tester, Field Strength Meter, Collection Box, Transmittance Tester, Capillary Water Absorption Time Tester, Redox Potentiometer Vibration Tester, Carbon Monoxide Carbon Dioxide Tester , CO2 analyzer, oscilloscope polarimeter, slime content tester, car power supply, automatic potentiometric titrator, portable thermometer, zirconia analyzer, dry reed test , Precision conductivity meter, TOC water quality analyzer, microcomputer plasticity tester, wind direction station, automatic sampler, soil redox potentiometer, digital thermometer, portable total phosphorus tester, corrosion rate meter, constant temperature water bath, Residual chlorine detector, free expansion rate meter, centrifugal cup, concrete saturated vapor pressure device, particle strength tester, Gauss meter, automatic film coating machine, weather station, kinesthetic azimuth meter, odor collector, rain gauge, four All-in-one gas analyzer, emulsifier concentration meter, dissolved oxygen meter, temperature meter, thin-layer plate spreader, temperature recorder, aging meter, noise detector, constant temperature and humidity box, split resistivity tester, initial viscosity and Holding viscosity tester, infrared carbon dioxide analyzer, hydrogen lamp, kinesthetic azimuth meter, cooling fan, oil acid value detector, viscosity number analyzer, colony counter, weather station, rain gauge, Kjeldahl nitrogen analyzer, fluorescent whitening Agent, beer foam tester, gas generating tester, low frequency signal generator, oil quality tester, counter, leakage current tester, strain simulator, standard dynamometer, Capillary water absorption time tester, sludge ratio tester, atmospheric sampler, flow meter, relay protection tester, volume resistivity tester, side light detector, illuminance meter, integrated distillation instrument, flue gas analyzer company The "customer first, forge ahead" business philosophy, adhere to the "customer first" principle to provide our clients with quality services. Welcome to patronize!
Lip Makeup,Liquid Lipgloss,Lip Gloss,Lipstick Or Lipgloss
Suzhou Yimeijia368 Biological Technology Co.,Ltd. , https://www.szymjbeauty.com