Product Description:
1、 Instrument Overview:
The sanitary pressure transmitter series diffusion silicon pressure transmitter adopts a new generation of pressure detection principle, which has the advantages of technical reliability, easy installation, high sensitivity, small size, and vibration resistance compared to traditional products. It has become the most widely used pressure transmitter today. And convert it into a 4-20mADC signal. Cooperate with corresponding display instruments, recording instruments or regulators to achieve automatic detection and control of pressure parameters.
2、 Measurement principle:
A sanitary 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、 Applicable occasions:
The components and parts of the pressure transmitter are sourced from imported high-quality diffusion silicon and ceramic pressure sensors as sensitive components. They use dedicated integrated modules and undergo 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、 Performance characteristics:
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、 Technical 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～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 according to the nameplate and instructions, and connect the wires as required.
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, it is necessary to use a wrench to tighten the nut. The nut should not be tightened too tightly during installation, and it is strictly prohibited to clamp other parts for installation or disassembly to avoid damaging the 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.
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, it is necessary to use a wrench to tighten the nut. The nut should not be tightened too tightly during installation, and it is strictly prohibited to clamp other parts for installation or disassembly to avoid damaging the 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.
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