The intelligent pressure transmitter is composed of two parts: a smart sensor and an intelligent electronic board. The smart sensor part includes: a capacitive sensor, a measuring diaphragm detecting circuit, a temperature sensor and a temperature compensation circuit; the intelligent electronic board part includes: a microcomputer controller And peripheral circuit composition, used to measure the pressure of liquid, gas or steam, and then convert the pressure signal into a 4 ~ 20mADC signal output. It can communicate with HART Communicator, set it, adjust pressure range, monitor or form on-site monitoring system with upper computer. HJ-3351GP intelligent pressure transmitter is widely used in industrial pipelines with weak corrosive liquids, gases, Steam measurement and control system.
Intelligent pressure transmitter selection rules:
1. Confirm the type of pressure to be measured.
The pressure forms mainly include gauge pressure, differential pressure and absolute pressure mode. When measuring the liquid level, the gauge pressure or differential pressure mode is selected according to the free atmospheric pressure or the sealing air pressure above the liquid level. For example, the liquid pressure measurement in the sealed pressure vessel should select the differential pressure mode.
2. Confirm the range of pressures that need to be measured.
The pressure value generally measured should be 60%-100% of the standard range of the selected pressure transmitter, usually 70%.
3. Confirm the required overload capacity.
The overload pressure that may occur in the system. It includes pressure peaks caused by abnormal conditions such as pulsation, vibration, and shock. The high peak pressure of the zui of the general system should not exceed the large overload of the product allowed by the product.
4. Confirm the measurement accuracy of the measurement, that is, the accuracy.
The accuracy provided is a comprehensive indicator with three indicators, namely linearity, repeatability, and hysteresis. There are generally four grades of 1.0, 0.5, 0.25 and 0.1. The accuracy level determination should be based on the large error of the zui assigned to the sensor by the measurement system. In practice, sometimes zero drift, additional errors introduced by the zero and sensitivity temperature systems should be considered.
5. Confirm the temperature range used.
The media temperature at the user application site should be within the compensation range of the pressure transmitter, which will ensure stability and accuracy during product application. The sensor can still work if the operating temperature exceeds the compensation range but is within the operating temperature range, but its measurement accuracy and service life will be greatly affected. For users with a wide temperature range and high accuracy, smart products are available.
6. Confirm whether the medium used in the place is corrosive.
Depending on the corrosive nature of the media used, the sensitive components and housing of the pressure transmitter will be made of different and media compatible materials, sometimes with special processing, which are closely related to the price and lead time of the product. It needs to be considered in advance and made at the time of ordering.
7. Confirm the pressure interface form.
The pressure transmitter products provided have standard interface forms. If the user needs special interface form, it can be specially customized to ensure smooth connection with the field interface.
8. Confirm the power supply form and output form.
The product is available in a standard power supply and is available in four output configurations: 4-20mADC, 0-10VDC, and the user needs to confirm that the selected model and field application requirements match.
9. Determine if there is interference or vibration at the installation site.
If yes, please submit it at the time of selection. Our company will carry out anti-interference treatment according to the specific conditions.
10. Determine whether there is pressure shock at the installation site.
The instantaneous pressure shock causes the fluid to move at a high speed to impact the pressure sensing diaphragm, and the excessive kinetic energy impacts the additional pressure to cause a large pressure overload. If there is a pressure shock phenomenon, please ask at the time of selection, our company will pressure buffer the product according to the specific conditions.
It can prevent some medicine or blood from splashing on the face, thus protecting the eyes. This kind of glasses is generally used in conjunction with masks and surgical caps to fully protect the doctor's head.
[Functions of medical eye masks]
1. Prevent blood, potion and other liquids that cause damage to the skin from causing unpredictable damage to the eyes.
2. It can prevent the impact of objects on the eyes during close surgery.
3. The inner space of the eye mask is large enough for doctors who wear myopia glasses.
4. The breathability must be good, generally there are vents
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