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Help CenterVmi Electromagnetic Flowmeter Sensor, Constant Pressure Sensor, Oil Pressure and Air Pressure Sensor, Diffused Silicon Core
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Overview
This pressure transmitter selects high-precision pressure sensor components from international companies. Through a highly reliable amplifier circuit and precise temperature compensation, it converts the pressure of the measured medium into standard electrical signals such as 4 - 20mADC, 0 - 5VDC, 0 - 10VDC, and 1 - 5VDC. High-quality sensors, excellent packaging technology, and perfect assembly processes ensure the excellent quality and performance of this product. This product has a variety of interface forms and lead - out methods, which can meet the needs of customers to the greatest extent and is suitable for supporting various measurement and control equipment.
Working Principle
When the pressure signal acts on the sensor, the pressure sensor converts the pressure signal into an electrical signal. After differential amplification and output by the amplifier, and finally through V/A voltage - current conversion, it outputs a 4 - 20mA standard current signal that has a linear correspondence with the liquid level pressure of the measured medium (liquid).
Features:
Small volume, high stability, high sensitivity
0 - -0.1MPa to 0 - 250MPa
Strain - gauge sensors, diffused silicon sensors, and ceramic piezoresistive sensors are optional
Stainless - steel structure
Multiple range selections, convenient for users to debug
Optional parts with adjustable zero/full scale
Pressure types: gauge pressure, absolute pressure, vacuum
Accuracy: Class 1.0, Class 0.5, Class 0.25, Class 0.1
Small integrated liquid - crystal display and gauge heads with switching - value output can be selected
Laser marking can be used to ensure the traceability of the product
Applications:
Hydraulic and pneumatic control systems
Liquid level measurement and control
Petrochemicals, environmental protection, air compression
Power plant operation inspections, locomotive braking systems
Thermal power units
Light industry, machinery, metallurgy
Building automation, constant - pressure water supply
Other automatic control and detection systems
Industrial process detection and control
Laboratory pressure calibration
Technical Parameters:
Measuring medium: Various liquids, gases, or vapors compatible with 304/316 stainless steel
Measuring range: Gauge pressure 0 - 0.01MPa to 0 - 250MPa; absolute pressure 0 - 0.1MPa to 0 - 250MPa; vacuum 0 - -0.1MPa
Overload pressure: 2 times the full scale or 300MPa (take the smaller value)
Output signal: 4 - 20mADC (two - wire system), 0 - 10VDC, 0 - 5VDC, 1 - 5VDC, 1 - 10VDC (three - wire system)
Supply voltage: 9 - 36VDC (two - wire system), 24±5VDC (three - wire system)
Medium temperature: -30～+85℃
Ambient temperature: -20～+85℃
Storage temperature: -40～+90℃
Relative humidity: ≤ 95％(40℃)
Rise time: ≤5 milliseconds to reach 90％FS
Accuracy: Class 1.0, Class 0.5, Class 0.25 (comprehensive error including non - linearity, repeatability and hysteresis)
Zero adjustment: ±8％ of the output range
Range adjustment: ±20％ of the output range
Temperature drift: ≤±0.05％FS／℃ (temperature range -20～85℃, including the temperature influence on zero and range)
Temperature compensation range: 0～70℃
Stability: Typical: ±0.1％FS／year; Maximum: ±0.2％FS／year
Medium contact material: 316 stainless steel/304 stainless steel
Shell material: 304 or 316 stainless steel
Installation method: Threaded installation
Pressure connection: M20×1.5, M12×l, G1／4, G1／2 male threads, etc.
Electrical connection: Four - core shielded cable (protection class IP65), aviation plug, DIN connector
Installation and use
Before installing and using the pressure transmitter, you should read the product sample and instruction manual in detail. During installation, the pressure interface must not leak, and ensure that the range and wiring are correct. The shells of pressure sensors and transmitters generally need to be grounded. Signal cables should not be laid together 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.
On - site fault inspection: Most of the faults occurring at the construction site are caused by improper use and installation methods of pressure sensors. Summarized as follows: 1. The primary elements (such as orifice plates and remote - transmission measuring joints) are blocked or installed in the wrong form, and the pressure - taking points are unreasonable. 2. The impulse tube leaks or is blocked. There are residual gases in the liquid - filled tube or residual liquids in the gas - filled tube. There are sediments in the process flange of the transmitter, forming a measurement dead zone. 3. The transmitter is wired incorrectly. The power supply voltage is too high or too low. The connection between the indicator head and the instrument terminal is poor. 4. The installation does not strictly follow the technical requirements, and the installation method and on - site environment do not meet the technical requirements.
The above - mentioned faults of pressure sensors and transmitters will cause abnormal output or inaccurate measurement of the transmitter. However, through careful inspection, strict compliance with technical requirements for use and installation, and timely adoption of effective measures, all problems can be solved. For faults that cannot be handled, the transmitter should be sent to the laboratory or the manufacturer for further inspection.
Installation of additional devices
(1) To ensure that the instrument is not affected by the erosion, high viscosity or crystallization of the measured medium, an isolation device should be installed;
(2) To ensure that the instrument is not affected by the sudden change or pulsating pressure of the measured medium, install a buffer. Especially during sudden pressure increases and drops, it is most likely to damage or render the pressure instrument useless. Even the spring tube may burst, resulting in leakage.
(3) To ensure that the instrument is not affected by vibration, vibration damping devices and fixing devices should be installed on the pressure instrument.
(4) To ensure that the instrument is not affected by the high temperature of the measured medium, a bent tube device filled with liquid should be installed.
(5) Special-purpose instruments are strictly prohibited from being used for other purposes. It is also strictly prohibited to conduct measurements without special and reliable devices. Moreover, it is strictly prohibited to use general pressure gauges to measure the pressure of special media.
(6) For newly purchased pressure detection instruments, before installation and use, a metrological verification must be carried out to prevent the accuracy from being damaged due to vibration, damage or other factors during transportation of the pressure instrument.
Daily Maintenance
1. Check the size of the installation hole.
2. Keep the installation hole clean.
3. Select an appropriate location.
4. Clean carefully.
5. Keep it dry.
6. Avoid low-temperature interference.
7. Prevent pressure overload.
8. The pressure transmitter needs to be checked once a week and inspected once a month. The main tasks are to remove the dust inside the instrument, carefully check the electrical components, and frequently calibrate the output current value. Since the inside of the pressure transmitter is a weak current circuit, it must be separated from the external strong current.
Solutions for Errors
1) Make the impulse tube as short as possible.
2) When measuring liquids or steam, connect the impulse tube to the process pipeline in an upward flow direction, and its slope should be no less than 1/12.
3) When measuring gases, connect the impulse tube to the process pipeline in a downward direction, and its slope should be no less than 1/12.
4) When laying the liquid impulse pipeline, avoid high points in the middle. When laying the gas impulse tube, avoid low points in the middle.
5) Keep the same temperature between the two impulse tubes.
6) To avoid the influence of friction, the diameter of the impulse tube should be large enough.
7) There should be no gas in the impulse tube filled with liquid.
8) When using isolation liquid, the liquid in the two impulse tubes on both sides should be the same.
9) When using a cleaning agent, the connection point of the cleaning agent should be close to the pressure tapping point of the process pipeline. The length and diameter of the pipeline through which the cleaning agent passes should be the same, and the cleaning agent should be prevented from passing through the transmitter.
Selection Steps
The selection of a pressure transmitter is very important. Based on my work experience, the following is about the selection of pressure transmitters.
1. The operating environment of the transmitter.
2. Range. (Refer to the parameters - range of the pressure transmitter for details.)
3. Overload pressure. (Generally, differential pressure also requires a parameter for static pressure.)
4. Accuracy.
5. Pressure medium.
6. Supply voltage.
7. Output signal.
8. Shock and vibration.
9. Pressure response.
10. Pressure interface.
11. Electrical interface.
12. Safety certification.
That's mainly all. However, there may be different accessories for different transmitters. Please pay attention when selecting models.
After-sales service
I. Quality assurance service
(1) The product quality is guaranteed by three - guarantees policy
The product warranty period starts from the date of delivery and lasts for one year. During the warranty period, if there are quality problems with the product itself, Xi'an Shenghongchuang Instrument & Meter Co., Ltd. will provide free repair, replacement and return services.
1. If the general parts of the product fail and can be restored to the required operating state after replacement, we are responsible for free and timely repair;
2. If the main parts of the product fail and cannot be repaired on schedule, a qualified product of the same model and specification will be replaced;
(2) Exemption scope
During the warranty period, product failures caused by the following human and force majeure factors are not within the scope of free repair, replacement and return services:
1. The usage occasion is inconsistent with the parameters in the purchase contract;
2. Product failures caused by improper use by the customer;
3. Self - repair and modification of the product by the customer;
4. The product appearance is severely damaged and deformed, the product logo is lost, and the product source cannot be identified;
5. Product damage caused by natural disasters such as earthquakes, floods, fires, etc.;
6. Human factors.
II. Lifetime maintenance service for products
For faulty products that have exceeded the warranty period or fall within the exemption scope, Xi'an Shenghongchuang Instrument & Meter Co., Ltd. will provide lifetime maintenance for your products, only charging maintenance cost and product transportation cost.
Xi'an Shenghongchuang Instrument & Meter Co., Ltd. specializes in the production of pressure transmitters!
Since its establishment, Xi'an Shenghongchuang Instrument & Meter Co., Ltd. has been mainly engaged in the R & D and production of pressure, liquid level, temperature, differential pressure, digital display, weighing and flow meters. The main products include Swiss metallux ceramic piezoresistive sensors and self - developed ceramic capacitive pressure sensors. Diffused silicon, ceramic piezoresistive, strain gauge, metal capacitive, ceramic capacitive pressure transmitters, remote pressure transmitters, high - temperature pressure transmitters, flat - membrane pressure transmitters, anti - corrosion pressure transmitters, integrated/separate liquid level transmitters, anti - corrosion liquid level transmitters, lightning - proof liquid level transmitters, high - temperature pressure - guiding liquid level transmitters, straight - rod liquid level transmitters, flange liquid level transmitters, wind pressure transmitters, metal capacitive differential pressure transmitters, diffused silicon differential pressure transmitters, pressure controllers, thermocouples/resistors, temperature transmitters, ultrasonic liquid level gauges
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