pressure differential monitor

Accurate and timely measurement of multiphase flow production in oil wells has important guiding significance for mastering the production performance, working conditions, and formulating production optimization measures. The multiphase flow meter is widely used in the domestic petroleum industry, but it usually generates a certain additional pressure drop and increases the backpressure of the wellhead. And it will increase energy consumption and affect the production of oil wells. The intelligent low differential pressure online metering system for oil wells has the advantages of less pressure loss, more functions, high accuracy, and a high degree of automation, etc.

The oilfield intelligent low differential pressure sensor metering system can get the wellhead temperature, pressure, differential pressure, instantaneous flow, time production, cumulative production, and average production of oil wells in a timely and accurate manner, by wireless remote data transmission, software analysis, and calculation.

Ⅰ. Features of the low differential pressure sensor

1. Multi-functional monitoring of differential pressure, static pressure and temperature.

2. Direct measurement for liquid, gas and steam without the oil and gas separation.

3. Easy installation, Convenient operation, explosion-proof design and safety.

4. Wireless output

Ⅱ. Advantages of the low differential pressure sensor

1. With the help of low differential pressure snsor for throttle pressure difference measurement, pressure loss is less and will not increase the wellhead pressure and affect the production.

2. Throttle forward and backward pressure, differential pressure values are in a same measurement system by using the low differential pressure sensor, avoiding the problems of pressure reversal and zero shift.

3. As the multiphase fluid passing through the differential pressure measuring device, the effect of fluid Reynolds number on the fluid outflow coefficient and the expansion coefficient is considered, so the outflow coefficient and the expansion coefficient are corrected accurately. The metrological model has a solid physical theoretical foundation, and its application scope is basically unlimited.

4. The method considers the influence of different water cuts and different gas-oil ratios on production measurement, which is suitable for liquid production measurement under different water cuts and different gas-oil ratios, and can reflect the change trend of liquid production in time.

5. More accurate calculation of the multiphase fluid mixing density and other physical parameters and accurately correct the multiphase fluid physical parameters through online temperature compensation, pressure compensation, so as to further improve the measurement accuracy of liquid production.

6. The calculation error of the oil well can be guaranteed within 5%, and the calculation accuracy can be further improved through calibration.

pressure differential monitor

Sensors will continue to be a “game changer” in many industries, both now and in the future. As the popularity of the Internet of Things (IoT) expands, our demand for sensors is growing. Four different types of sensors are currently the most popular in four industries: manufacturing, healthcare, aviation and agriculture.

1. Pressure sensors 

We all know that pressure sensors are capable of sensing the pressure of liquids and gases and then converting it into electrical signal output. With the help of the differential pressure sensor, companies can adopt Internet of Things (IoT) systems to implement real-time monitoring systems. Pressure sensors can also be used to measure fluid/gas flow, velocity, water level and height, etc. For example, in the automotive industry, pressure sensors are used in engines to monitor oil and coolant pressure, as well as in vehicle anti-lock braking systems (ABS), fluid pressure monitoring such as hydraulic pressure, pipeline pressure monitoring, etc. In addition, pressure sensors are also used in aviation, marine, industrial, biomedical instrumentation and other industries.

2. Temperature sensors   

As a regular industrial pressure sensor, the temperature sensor is used to measure the temperature or heat energy of a given source by electrical signals.

With the Internet of Things (IoT) systems, temperature sensors can be used in manufacturing, agriculture and health industries. Applications in the manufacturing industry are: plastic extruders, chemical fiber drawing equipment, plastic and rubber manufacturing equipment can simultaneously monitor the pressure and temperature. It is also important to place the machine or equipment in a suitable environment to ensure that the system always maintains a constant temperature.  Sensors can solve this problem by providing data that helps track the temperature of a given space.

3. Chemical sensors

As the name suggests, chemical sensors are used to collect information about different parts, such as composition, presence of specific elements or ions, chemical activity, partial pressure, etc.

As an industrial pressure sensor, chemical sensor is used in industrial environments for monitoring and process control to detect hazardous, explosive, or radioactive chemicals, as well as in laboratories and pharmaceutical recycling processes. Various types of chemical sensors include electrochemical gas sensors, chemical field effect transistors, pH glass electrodes, zinc oxide nanorod sensors and chemical resistors.

4. Infrared sensors

Infrared sensor can be defined as electronic devices that are sensitive to certain aspects of the surrounding environment. Infrared sensors can measure the heat of an object and detect motion.

Infrared sensors can be used in healthcare, home appliances, wearable electronics, contactless temperature measurements and other fields. Infrared sensors can also be used for environmental inspections, as it can detect many types of chemicals and heat leaks.

With sensors increasing industrial efficiency and productivity, and the adoption of Industry 4.0 in developing countries, the sensor market is expected to see significant growth in the near future.

low price pressure sensor

The pressure indicator refers to instruments used to measure gas and liquid pressure, usually divided into mechanical pressure indicator, electronic pressure indicator and mechatronic pressure indicator.

1. Electronic pressure indicator

The basic component of the electronic pressure indicator is the pressure sensor, which can convert the pressure measurement parameters into electronic signals. The advantages of the electronic pressure indicators are their excellent dynamic performance and low material stress, resulting in high load impedance and excellent long-term stability, as well as compact structure and compact shape.

2. Mechatronic pressure indicator

Mechatronic pressure indicator usually refers to a mechanical pressure indicator integrated with electronic components or parts. This kind of instrument can not only display the measured pressure on the machine, but also provide electrical signal or contain electrical switch function. Even if the power supply is cut off or the measurement signal is interfered, the measurement value can still be read on site.

By combining the mechanical pressure indicator with different signals and switches, a variety of mechatronic pressure indicator products can be obtained. In addition, the sensor does not have any mechanical contact during operation, good wear resistance, and will not have any impact on the pressure indicator. Therefore, the pressure indicator manufacturer prefers to produce this kind of indicator.

3. Mechanical pressure indicator

This type of pressure indicator is not only sturdy and durable, but also easy to operate, with a wide range of applications. The elastic pressure element of the indicator deforms when subjected to pressure. The measurement system consists of a diaphragm box, diaphragm seal or Bourdon tube and is available in copper alloys, alloy steels, and special materials suitable for special measuring condictions.

4. Diaphragm seal

Diaphragm seals can meet the pressure measurement application requirements under severe environmental conditions. As the pressure indicator manufacturer, Alpha Instruments can also provide customers with the most suitable solutions such as corrosive, high viscosity or fibrous media, super high temperature, hard to hit a measurement point, measurements with high sanitation requirements as well as toxic or polluting media, etc.

cost effective pressure sensor

Ⅰ. Structures of the capacitive pressure sensor

The capacitive pressure sensors are based on silicon materials, using capacitance changes to convert pressure into capacitance changes, and are made by MEMS technology.

Ⅱ. Main problems of the capacitive pressure sensor

Because its detection principle is to use capacitive pole pitch variation, however is itself nonlinear. In order to improve the nonlinearity, develop a more complex core structure, such as contact, variable area in series with variable pole pitch, and other structures. Another problem that needs to be solved for displacement sensors is the detection of weak capacitive signals.

Ⅲ. Performance&characteristics of the capacitive pressure sensor

1. Capacitive pressure sensors are low-cost, which are suitable for mass production

The capacitive pressure sensor is made by MEMS technology, and the chip size is 3mm×3mm. A 4-inch silicon wafer can produce hundreds of components. The product has good manufacturability, consistent performance, suitable for mass production and low-cost operation. The preparation process is compatible with the IC process, and the process equipment is no need to be as expensive & complicated as the process equipment of the silicon resonant sensor, nor no need to be made in a single piece like the metal diaphragm capacitive sensor, which ensures that the silicon capacitive sensor has a high cost-performance.

2. Good stability

A capacitive pressure sensor is a structural sensor, and it also is an industrial pressure sensor. In terms of the detection principle, the stability of the pressure sensor is better than that of the physical sensor. From the perspective of the structure design, the stability of this type of sensor is ensured The structural process adopts a fully hard-sealed solid-state process, silicon-glass-metal pressure tube adopts electrostatic sealing, which reduces the stress, hysteresis, and deterioration caused by rubber sealing; the capacitor is not sensitive to temperature, the temperature additional error is not big, and it does not need to complicate temperature compensation like a silicon piezoresistive device. Good stability is one of the main reasons why silicon capacitive sensors are more popular.

3. Advanced parameters

The capacitive pressure sensor itself has the characteristics of low power, high impedance, small electrostatic attraction, and small heating effect, and can be used for non-contact measurement. The comprehensive performance index of silicon capacitive sensors such as nonlinearity, overload, static pressure, reliability, etc. are better than silicon piezoresistive sensors, ceramic capacitive sensors, and metal diaphragm capacitive sensors. The performance is equivalent to the silicon resonant sensor, especially refer to the non-linear index pursued by the user. Generally, the non-linearity of the silicon capacitive sensor is better than 0.05% FS, and the yield is more than 60%.

high accuracy pressure transducer

Pressure transmitters have been widely used in various working environments. Maybe everyone knows how to choose a pressure transmitter and how to use a pressure transmitter, but do you know how to maintain a pressure transmitter? What are the methods for daily maintenance of the pressure transmitter?

1. Itinerant inspection of pressure transmitter

Check the indication of the pressure transmitter, whether there is any abnormality, and see if it fluctuates within the specified range; for the pressure transmitter without on-site display, go to the control room to see its secondary indication. Whether there is debris around the meter or whether there is dust on the surface of the meter, it should be removed and cleaned in time.

2. Regular inspection of pressure transmitter

For some instruments that do not need to be checked every day, check regularly at intervals. Regular zero check. For the pressure transmitter used in the control system, no matter how short the inspection time is, it is still necessary to change the automatic control to manual control, so as not to affect the operation of the controlled equipment.

Alpha Instruments was established in 2005 in Massachusetts, USA. We specialize in the development and manufacture of low differential pressure sensors, which have been used in HVAC, critical environment, medical industry, semiconductor equipment and other fields.

Through our own R&D center, we can carry out basic research and can also use our unique technology to develop sensors. The design of our products is based on decades of experience applied to new ideas. Compared with other capacitive sensors, our extensively designed patented products can provide better long-term stability, higher sensitivity and higher pressure capacity. If you have any need, please feel free to consult.

cost effective pressure sensor

The pressure sensor is a device that can sense the pressure signal and convert the pressure signal into a usable output electrical signal according to a certain rule. It is usually composed of pressure sensitive components and signal processing unit. According to different test pressure types, pressure sensors can be divided into gauge pressure sensors, low differential pressure sensors and absolute pressure sensors. However, there will be some errors in the use of sensors in measurement. Among them, there will be errors in the use of low differential pressure sensors. If there are errors, they will affect the measurement results, so we must reduce these errors when using the sensors. Here’s how to reduce the error when installing low differential pressure sensors.

When in use, the liquid pressure tube should avoid high points, and the gas pressure tube should avoid low points. This is the preparation work to be done in the layout, so that the error can be reduced.

To reduce the error, the two pressure guiding tubes should be kept at the same temperature. At the same time, the caliber should be as large as possible, and the pressure guiding tube should be as short as possible.

There must be no gas in the liquid guide tubes, and the level of the two guide tubes should be the same when the spacer is used.

When the pressure pipe is connected to the process pipeline upward, its slope cannot exceed 1/12. And it’s time to measure liquid vapor on it.

Finally, when the low differential pressure sensor is measuring gas, the pressure guide pipe we refer to shall be connected downward to the process pipeline, in which the required slope shall not be less than 1/12.

Therefore, there are many benefits to the correct installation of the low differential pressure sensor, which is also a skill that every worker must master. The installation is of vital importance to the staff, and it is also necessary to master the wiring method of the sensor. Now let’s talk about how the sensors are wired.

In fact, the wiring methods of various sensors are basically the same. Pressure sensors generally have a two-wire system, a three-wire system, a four-wire system, and some have a five-wire system.

The two-wire system of the pressure sensor is relatively simple. Generally, customers know how to connect it. One wire is connected to the positive pole of the power supply, and the other is the signal wire connected to the negative pole of the power supply through the instrument, which is the simplest method.

The three-wire system of the pressure sensor is based on the two-wire system with a line that is directly connected to the negative pole of the power supply, which is a bit more troublesome than the two-wire system.

The four-wire pressure sensor must be two power input terminals, and the other two are signal output terminals. Most of the four-wire system is voltage output instead of 4-20mA output. The 4-20mA one is called pressure transmitter, and most of them are made into two-wire system. The signal output of some pressure sensors is not amplified, and the full-scale output is only tens of millivolts, while some pressure sensors have an internal amplifier circuit, and the full-scale output is 0~2V. As for how to connect to the display instrument, it depends on the range of the instrument. If there is a gear suitable for the output signal, it can be measured directly, otherwise a signal adjustment circuit must be added.

The five-wire pressure sensor is not much different from the four-wire system, and there are fewer five-wire sensors on the market.

variable capacitance pressure sensor

Many people don’t know how to choose a low differential pressure sensor that is suitable for their needs. Today, the precautions when choosing a low differential pressure sensor will be shared with you .   1. How much accuracy does the low differential pressure sensor need The accuracy is determined by the effects of nonlinearity, […]

low pressure differential pressure transducer

Alpha Instruments Inc. is a professional differential pressure sensor supplier integrating R&D, production and sales. It has unique core technologies in core materials, structural design, processing technology, etc., and can provide various standardized and customized differential pressure sensor products. The performance of Alpha’s differential pressure sensor products is industry-leading. Its smallest measurement range can reach 0-10Pa; the highest measurement accuracy can reach 0.25-1; the highest overload resistance can reach 15Psi (100kPa). The company’s various performance indicators, product consistency, and long-term stability are all at the leading level in the industry. After years of development, Alpha’s products have been extensively verified in the market and enjoyed high market visibility and brand reputation.

According to reports, the micro-differential pressure sensor is mainly used to measure the small pressure difference and monitor the small pressure difference between the internal and external spaces. The smaller the pressure difference is, the more difficult it is to measure accurately, and the higher the accuracy requirements of the sensor will be. The sensor also has strict requirements on its anti-overload ability and long-term stability, which is a typical high-end industrial sensor. The downstream application fields of differential pressure sensors are relatively wide, including HVAC, environmental pollution control, semiconductor manufacturing, biopharmaceuticals, modern aquaculture, textile machinery, medical instruments and equipment, oven pressurization and furnace air pressure control, natural gas, gas pipe network monitoring, underground ventilation and power plant wind pressure monitoring and other fields. Due to the high technical threshold of products, the differential pressure sensor supplier is still dominated by foreign brands.

Alpha Instruments Inc. is positioned in the subdivision field of pressure sensors, which belongs to the differential pressure sensors. The company masters the core technology, uses the unique variable capacitor structure and manufactures high-end pressure sensors with excellent performance, corrosion resistance and long-term stability, in order to achieve long-term accurate and effective measurement of small differential pressure.

electrical pressure transducer

The pressure is one of the important parameters in industrial production. To ensure the normal operation of production, pressure must be monitored and controlled. The following are the terms commonly used in the model selection of the low differential pressure sensor:

1. Standard pressure

It refers to the magnitude expressed by taking the atmospheric pressure as the standard, the pressure greater than the atmospheric pressure is called positive pressure, while the pressure less than the atmospheric pressure is called negative pressure.

2. Absolute pressure

It refers to the magnitude of pressure expressed by taking the absolute vacuum as the standard.

3. Relative pressure

The magnitude of the pressure for the comparison object (standard pressure).

4. Atmospheric pressure

It refers to the atmospheric pressure. The standard atmospheric pressure (1atm) is equivalent to the pressure of a mercury column with a height of 760mm.

5. Vacuum

It refers to the pressure state below atmospheric pressure. 1Torr=1/760 atmospheric pressure (atm).

6. Detection pressure range

It refers to the adaptive pressure range of the low differential pressure sensor.

7. The pressure that can withstand

When the low differential pressure sensor returns to the detection pressure, its performance does not degrade under the pressure that can withstand.

8. Round-trip precision

At a certain temperature (23°C), when the pressure is increased or decreased, the pressure variation value at the operating point is obtained by dividing the pressure value of output reversal with the full-scale value of the detection pressure.

9. Precision

At a certain temperature (23°C), when zero pressure and rated pressure are applied, the value is obtained by dividing the deviation from the specified value of the output current (4mA, 20mA) with the full-scale value, the unit is expressed by %FS.

10. Linearity

The output of the simulated low differential pressure sensor varies linearly with the detection pressure, but it has a deviation compared with the ideal straight line. The value of this deviation expressed as a percentage of the full-scale value is called linearity.

11. Hysteresis

Use zero voltage and rated voltage to draw an ideal straight line between the output current (or voltage) value, find the difference between the current (or voltage) value and the ideal current (or voltage) value as the error, and then find the error value when the pressure rises and when it falls. The value obtained by dividing the maximum value of the absolute value of the above difference with the full-scale current (or voltage) value is the hysteresis. The unit is expressed by %FS.

capacitive pressure sensor

A brief introduction of capacitive pressure sensor

The ceramic capacitive pressure sensor uses a ceramic diaphragm as a pressure-sensitive element. The ceramic diaphragm and the ceramic substrate are respectively made into the two poles of the capacitor. When external pressure acts on the ceramic diaphragm, the ceramic diaphragm is deformed and the distance between the two poles changes, resulting in a change in capacitance, and then through a specific ASIC conditioning chip to output a standard voltage signal.

The structrue of the Capacitive pressure sensor

Ceramic capacitive pressure sensor mainly consists of two parts: ceramic substrate and ceramic diaphragm in structure. The ceramic diaphragm and ceramic substrate are sintered together with high-temperature molten glass to play a sealing role. Electrode patterns are printed on the inside of the ceramic substrate and the ceramic diaphragm to form a variable capacitor. When the measured external pressure is transmitted to the ceramic diaphragm through a special channel, the capacitance between the ceramic substrate and the ceramic diaphragm will change with the pressure, and then specific ASIC conditioning chip converts the measured capacitance signal into a voltage signal through a set conversion equation.

Ceramic capacitor technology has the advantages of moderate cost, good corrosion resistance, and strong media compatibility. Pressure sensors using ceramic capacitors as pressure-sensitive components are widely used in pressure detection of water, gas, and liquid media. It is especially suitable for the harsh working environment of automobile systems, for air-conditioning pressure, air brake pressure, oil pressure, exhaust back pressure and transmission pressure.