Industrial grade pressure transmitter

Pressure gauge>>ZW308Industrial grade pressure (sensor) transmitter：

1、 Instrument Introduction:
Industrial grade pressure transmitterThe series diffused silicon pressure transmitter adopts a new generation of pressure detection principle. Compared with traditional products, it has the advantages of advanced technology, reliable performance, convenient installation, high accuracy, small size, vibration resistance, etc. It has become the most widely used pressure transmitter today. Suitable for pressure detection of gas, liquid, and steam media in fields such as chemical, petroleum, power plants, metallurgy, building materials, medicine, food, and water supply and drainage, and converting them into 4-20mADC signals. Cooperate with corresponding display instruments, recording instruments or regulators to achieve automatic detection and control of pressure parameters.
2、 Working principle:
A pressure transmitter is a device that produces a linearized output signal proportional to the applied pressure when the resistance value changes when pressure is applied to the diaphragm. Adding a DC power supply will generate an output of a DC voltage signal. After a secondary conversion circuit, achieve a two-wire system with 4-20mA output.

3、 Application scope:
Industrial grade pressure transmitterThe components and parts are all sourced from imported high-quality diffusion silicon and ceramic pressure sensors as sensitive components, using integrated modules and fine temperature drift, zero point, and nonlinear compensation to achieve accurate measurement and transmission of pressure changes in liquids, gases, steam, and other media.

4、 Advantages:
1. Good stability, with a long-term stability of 0.2% FS/year at full and zero positions. Within the compensation temperature range of 0-70 ℃, the temperature drift is less than 0.2% FS, and within the entire allowable operating temperature range, it is less than 0.5% FS.
2. Equipped with reverse protection and current limiting protection circuits, the transmitter will not be damaged if the positive and negative poles are reversed during installation. In case of abnormalities, the transmitter will automatically limit the current to within 35MA.
3. Solid state structure, no movable parts, high reliability, long service life.
4. From wind pressure to water and oil, high-precision measurements can be made without being affected by the mass of the measured medium.
5. Easy to install, simple structure, economical and durable.

5、 Performance indicators:
1. Power supply: 24VDC output 4-20mA two-wire system;
2. Zero position adjustable range: ± 5% F · S;
3. Range adjustment ratio: above 3:1;
4. Range: -100kPa to 0-60MPa;
5. Load characteristics: The load maintains a constant current output within 0-600 Ω (24VDC power supply);
6. Explosion proof type: d Ⅱ BT4, intrinsic safety type: ia Ⅱ CT5;
7. Overpressure limit: 2 times the upper limit pressure;
8. Temperature range: Process: -20~60 ℃;
9. Accuracy level: ± 0.5%;
10. Stability: ± 0.2% F · S;
11. Weight: Approximately 1kg.
6、 When ordering explosion-proof transmitters, there are several points to note:
1. There are two types of explosion-proof products for transmitters: explosion-proof and intrinsic safety;
2. Clarify the composition and location of flammable and explosive media in hazardous areas on site;
3. It is necessary to choose a transmitter with an explosion-proof rating higher than or the same as the flammable medium level and humidity group.
4. The allowable operating temperature for explosion-proof products is -20 ℃ to+70 ℃.
5. When ordering an intrinsic safety transmitter, it is necessary to purchase the corresponding safety barrier and connect the wires as required according to the nameplate and instructions.

7、 Common troubleshooting:
1. During installation, the axial direction of the pressure sensitive part of the transmitter shall be perpendicular to the gravity direction. If the installation conditions are limited, the zero position of the transmitter shall be adjusted to the standard value after installation and fixation.
2. The residual pressure cannot be released, so the zero position of the sensor cannot be lowered. The ideal way to eliminate this cause is to remove the sensor and directly check if the zero position is normal. If the zero position is normal, replace the sealing ring and try again.
3. The output of the pressure transmitter does not change, and if the output of the pressure transmitter suddenly changes, the zero position of the pressure relief transmitter cannot return. The most likely cause of this phenomenon is the sealing ring of the pressure sensor.
4. Whether it meets the power supply requirements; Is there any wiring error between the power supply, transmitter, and load equipment. If there is no voltage or the polarity is reversed on the wiring terminals of the transmitter, it can cause the transmitter to output no voltage signal.
5. The casing of pressure sensors and transmitters generally needs to be grounded, and signal cables should not be mixed with power cables. Strong electromagnetic interference should be avoided around sensors and transmitters. Sensors and transmitters should be periodically calibrated according to industry regulations during use.
6. When selecting pressure sensors and transmitters, users should fully understand the working conditions of the pressure measurement system, make reasonable choices according to their needs, so that the system can work in an ideal state and reduce project costs.
7. Transfer the filling liquid inside the isolation sheet and component to both sides of the measuring membrane. Measure the electrodes on both sides of the diaphragm and insulating film to form a capacitor.
8. The pressure transmitter is required to be inspected once a week and once a month, mainly to remove dust from the instrument, carefully check the electrical components, and regularly calibrate the output current value. The pressure transmitter has weak electricity inside and must be isolated from external strong electricity.

8、 Installation and usage precautions:
1. Carefully read the product manual that comes with the packaging. Connect the circuit correctly according to the diagram. Pay special attention to ensure that transmitter products do not have wiring errors.
2. When installing and disassembling products with threaded connections, the nut must be tightened with a wrench, and cannot be tightened too tightly during installation. It is strictly prohibited to clamp other parts for installation or disassembly to avoid damaging related connecting components. There should be no sharp or hard objects inserted into the pressure hole end to avoid damaging the sensitive membrane or isolation membrane. It is strictly prohibited to knock, impact, or drop.
3. The product manual, packing list, and certificate of conformity should be properly stored, as they are the basis for implementing the three guarantees.
4. The product appearance and joint threads must not be processed or modified arbitrarily, otherwise the responsibility for quality problems shall be borne by oneself.
5. Overloading beyond the limit is prohibited. Damage to sensitive membranes caused by overloading beyond the limit is not covered by the warranty.
Attention should be paid to the following usage scenarios:
a、 Instantaneously experiencing significant overload pressure in the pressure system.
b、 During pressure testing, pressurized equipment such as water pumps with excessive head and strong pressure can cause high-speed movement of the liquid level to impact the sensitive membrane, resulting in overload caused by large momentum impact and additional pressure.
C、 When calibrating with a piston pressure gauge, the piston malfunction was not detected, resulting in high overload and impact on the sensitive membrane when the pressure was released.
6. Due to the self compensation function of the constant current power supply for the diffusion silicon sensor, it is recommended to use a constant current source for power supply. Our company can also provide integrated products for constant current sensing. If the temperature coefficient measurement requirements are not high and conditions do not allow, a constant voltage source can also be used.
7. The zero position output of diffused silicon sensors cannot be directly eliminated using the single arm resistor method. Software zeroing, differential input trimming, T-shaped resistor network correction, and other methods can be used.
8. It is strictly prohibited to use sharp objects, screwdrivers, or fingers to directly press the wax plate for pressure testing. This can easily cause irreparable damage. Any product zero position increase or failure caused by damage to the silicon film or isolation film (which can only be caused by direct pressing or excessive pressure overload) is not covered by the warranty.

9、 Selection spectrum:

Selection Tips:
1. The temperature range of the product can be sorted into five items, and users can determine the temperature range according to their industrial and mining requirements, making their product selection more economical.
2. Select the additional function code "i" for intrinsically safe explosion-proof EXdIICT6, which must be powered by a safety barrier.
3. Please consult with our company for any other special requirements and indicate them in the order.
10、 Ordering Notice:
1. Sensor materials;
2. Used in explosion-proof environments;
3. Materials and connection methods of connectors;
4. Sealing material;
5. Accuracy;
6. Range of measurement;
7. Is there any additional option available.
After-sales service
1. From the date of contract signing, Zhongwei Company will provide free maintenance and upkeep services for the products we provide, and promise lifelong repair services;
2. Jiangsu Zhongwei Measurement and Control Instrument Co., Ltd. will regularly communicate with customers to understand the usage of the product and solve any problems that may arise during customer use, and provide free of charge;
3. During the warranty period, if there is any man-made damage, our company is responsible for repairing it and collecting the repair costs incurred;
4. If there are quality problems or dissatisfaction with the product, users can choose to return or exchange it unconditionally. Zhongwei Measurement and Control does not charge any handling fees. If there are quality problems, they will bear the round-trip shipping costs.