In the field of industrial automation, intelligent micro differential pressure transmitters are widely used as important sensor devices for pressure measurement and transmission of various liquids, gases, steam and other media. This article will provide a detailed introduction to the characteristics and usage of intelligent micro differential pressure transmitters, in order to help readers better understand and choose this product.
1、 Characteristics of intelligent micro differential pressure transmitter
1. High precision and high stability
The intelligent micro differential pressure transmitter uses diffusion silicon or ceramic pressure sensors as sensitive components, and after fine temperature, zero point, full range, and nonlinear compensation, ensures the accuracy and stability of measurement results. The high precision and stability characteristics of this product make it perform well in industrial automation control systems and meet various demanding measurement requirements.
2. Small size and light weight
The intelligent micro differential pressure transmitter has the characteristics of small size and light weight, which enables it to be flexibly installed in narrow spaces and adapt to various complex industrial environments. Meanwhile, its compact structure also reduces production costs and improves the cost-effectiveness of the product.
3. sturdy and durable
The shell of this product is made of aluminum alloy die-casting, with three end isolation and electrostatic spray protection layer, which can effectively resist harsh industrial environments such as high temperature, high humidity, corrosion, etc. In addition, the contact medium connecting piece is made of stainless steel material, and the O-ring is made of nitrile rubber, further enhancing the durability and reliability of the product.
4. Strong anti-interference ability
The intelligent differential pressure transmitter adopts a 4-20mA DC two-wire signal transmission system, which has strong anti-interference ability and can maintain signal stability and accuracy during long-distance transmission. This feature makes the product more reliable in industrial field applications, reducing measurement errors caused by signal interference.
5. Multiple indicator headers
This product is equipped with three types of indicator heads: LED, LCD, and pointer, making on-site reading very convenient. Users can choose the appropriate indication method according to their actual needs, which improves the convenience and readability of measurement.
2、 The use of intelligent micro differential pressure transmitter
Intelligent differential pressure transmitters are widely used in various industrial automation control systems, such as petroleum, chemical, power, metallurgy and other industries. It can be used to measure viscous, crystalline, and corrosive media, and is suitable for pressure measurement of various liquids, gases, and vapors.
During use, users need to choose the appropriate model and specifications according to their actual needs, and install and debug them correctly according to the product manual. At the same time, regular maintenance and overhaul of the product are also key to ensuring its long-term stable operation.
Precautions for maintenance and calibration of intelligent differential pressure transmitters during use
1. Regular zero point inspection/calibration:
Zero drift is the main source of error in micro differential pressure measurement. Regularly (e.g. monthly/quarterly, depending on operating conditions) conduct online or offline zero point checks/calibrations.
Use a balance valve (three valve group) for online zero calibration (recommended): Close the high and low pressure isolation valves, open the balance valve (theoretically, the high and low pressure ends should be connected with equal pressure), and check that the output should be 4mA (or 0% of the corresponding analog value) or the set point (digital type). If there is any deviation, perform Zero Trim calibration.
2. Zero point calibration operation:
It must be carried out in a static (no process fluctuations) and constant temperature environment (the transmitter should be preheated for at least 30 minutes after being powered on).
Confirm that the pressure at both ends has been balanced (through the balancing valve).
Perform zero position adjustment on the transmitter LCD, handheld device, or upper computer software. Do not force zero through mechanical knobs (most smart models do not have this knob).
3. Prevent instrument overvoltage:
Although the static pressure resistance of the micro differential pressure transmitter is high, operational errors (such as unilateral pressurization, rapid valve closure, or opening the valve too quickly) can easily lead to excessive differential pressure and damage to the core sensor.
Before disassembly/maintenance, it is necessary to release pressure: close the high and low pressure isolation valves, open the balance valve (and drain valve, if any), release the pressure in the high and low pressure chambers of the transmitter before operation.
4. Avoid condensation/freezing:
When measuring wet gases, ensure the correct slope of the pressure pipe and use heat tracing/insulation to prevent liquid accumulation from freezing. Accumulation of fluid can lead to unstable or incorrect measurements.
5. Regular inspection: Check whether the appearance, electrical connections, and grounding are intact, and whether the pressure conduit is leaking or blocked.
In summary, intelligent differential pressure transmitters play an important role in industrial automation control systems due to their high precision, high stability, small size, light weight, durability, and strong anti-interference ability. Users should choose the appropriate model and specifications according to their actual needs during use, and strictly follow the product manual for operation and maintenance to ensure the long-term stable operation and measurement accuracy of the product.