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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 amplifier amplification, and finally through V/A voltage - to - current conversion, it outputs a 4 - 20mA standard current signal that has a linear corresponding relationship with the liquid level pressure of the measured medium (liquid).
Features:
Small size, high stability, high sensitivity
0～-0.1MPa to 0～250MPa
Strain - gauge sensors, diffused silicon sensors, and ceramic piezoresistive sensors are available
Stainless - steel structure
Multiple range selections, convenient for users to debug
Optional accessories with adjustable zero/full - scale
Pressure types: gauge pressure, absolute pressure, vacuum
Accuracy: 1.0 grade, 0.5 grade, 0.25 grade, 0.1 grade
Small integrated liquid - crystal display and meter 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
Petrochemical, environmental protection, air compression
Power station operation inspection, locomotive braking system
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 range or 300MPa (whichever is smaller)
Output signal: 4～20mADC (two - wire system), 0～10VDC, 0～5VDC, l～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 ms 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, M12×1, G1/4, G1/2 male thread, 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 the pressure sensor and transmitter generally need to be grounded. The signal cable should not be laid together with the power cable. Strong electromagnetic interference around the sensor and transmitter should be avoided. The sensor and transmitter 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 the pressure sensor. Summarized as follows: 1. The primary element (orifice plate, remote - transmission measuring joint, etc.) is blocked or the installation form is incorrect, and the pressure - taking point is unreasonable. 2. The pressure - guiding pipe leaks or is blocked. There is residual gas in the liquid - filled pipe or residual liquid in the gas - filled pipe. 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, and the connection between the indicating meter head and the instrument wiring 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 the pressure sensor and transmitter 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) In order to ensure that the instrument is not affected by the erosion, too 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, a buffer should be installed. Especially when the pressure increases sharply or drops suddenly, it is most likely to damage and render the pressure instrument useless. Even the spring tube may burst, causing leakage.
(3) To ensure that the instrument is not affected by vibration, a vibration damping device and a fixing device should be installed for 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 measure without a special and reliable device. Moreover, it is strictly prohibited to use a general pressure gauge to measure the pressure of special media.
(6) For newly purchased pressure detection instruments, metrological verification must be carried out before installation and use 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 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 isolated from the external strong current.
Solutions to errors
1) Make the pressure guiding tube as short as possible.
2) When measuring liquid or steam, connect the pressure guiding tube to the process pipeline in an upward flow direction, and its slope should be no less than 1/12.
3) When measuring gas, connect the pressure guiding tube to the process pipeline in a downward direction, and its slope should be no less than 1/12.
4) The layout of the liquid pressure guiding pipeline should avoid high points in the middle, and the layout of the gas pressure guiding tube should avoid low points in the middle.
5) The temperature between the two pressure guiding tubes should be the same.
6) To avoid the influence of friction, the diameter of the pressure guiding tube should be large enough.
7) There should be no gas in the pressure guiding tube filled with liquid.
8) When using isolation liquid, the liquid in the pressure guiding tubes on both sides should be the same.
9) When using a cleaning agent, the connection 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 a pressure transmitter.
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.
These are the main points. However, different transmitters may come with different accessories. Please pay attention when selecting models.
After-sales service
I. Quality assurance service
(I) The products are guaranteed with three - package service
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 components of the product fail and can be restored to normal use after replacement, we will be responsible for free and timely repair.
2. If the main components of the product fail and cannot be repaired on schedule, we will replace it with a qualified product of the same model and specification.
(II) 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 are caused by improper use by the customer.
3. The customer repairs or modifies the product by themselves.
4. The product appearance is severely damaged and deformed, and the product label is lost, making it impossible to identify the product source.
5. Product damage is caused by natural disasters such as earthquakes, floods, and fires.
6. Human factors.
II. Lifetime product repair service
For faulty products that are out of the warranty period or within the exemption scope, Xi'an Shenghongchuang Instrument & Meter Co., Ltd. will provide lifetime repair services for your products, only charging the repair 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 - diaphragm 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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