7MF Siemens pressure transmitter is a commonly used pressure transmitter product type, with the advantages of flexible use, stable performance, high reliability, good accuracy, fast response frequency, and high precision. The user needs a certain understanding of the 7MF Siemens pressure transmitter product knowledge, the following Xiaobian to introduce the specific, hope to help users better application products
7MF Siemens Pressure Transmitter Operating Principle
The process pressure is measured by passing through the isolation diaphragms on both sides or on one side and the filling liquid to the center of the δ chamber to measure the diaphragm. The central diaphragm is a tensioned elastic element that produces a correspondingly deformed displacement of the pressure difference acting on it, and it is filled with oil that flows into the central measuring diaphragm. In addition to the AP type absolute pressure transmitter, the other side of the measuring diaphragm is absolutely not the atmospheric pressure, or the differential pressure of the measured differential pressure, on the other side of the diaphragm is absolute vacuum reference point (see the figure below). side. Measure diaphragm is a kind of elastic tensioning element. The displacement is proportional to the pressure of the measured medium. The maximum displacement is only 0.10mm. The position of the diaphragm is detected by the capacitor fixing plates on both sides. The differential capacitance of the two capacitively-fixed plates of the measuring diaphragm is linearly converted by the amplifier circuit into a 4 to 20 m DC two-wire current signal.
7MF Siemens pressure transmitter function parameters
Use object: liquid, gas and steam
Measuring range: 0 to 0.1kPa, 0 to 40MPa
Output signal: 4 ~ 20mA DC (Specially available for 4-wire 220V power supply 0-10mA DC output)
Supply voltage: 12 to 36V DC standard value 24VDC
Load characteristics: related to the power supply, with the load capacity at a certain supply voltage, see the figure above, the relationship between the load impedance RL and the supply voltage Vs is: RL ≤ 50 (Vs-12)
Indicator: pointer linear indication 0 to 100% divided scale or LCD liquid crystal, LED digital display.
Explosion-proof: a. Flameproof type dIIBT4
The Thrust Roller Bearing is used to bear axial and radial joint loads as the main axial load, but the radial load should not exceed 55% of the axial load. Compared with other thrust roller bearings, this kind of bearing has a lower friction factor, higher speed and a heart regulating performance.
The rod of the 29000 type bearing is an asymmetrical spherical roller, which can reduce the relative slipping of roller and raceway in operation, and has many advantages such as long roller diameter, large diameter, large number of rollers and high load capacity. Usually, oil lubrication is used, and grease can be lubricated at some low speed. In the design and selection, it should be selected first.
The 80000 type thrust Cylindrical Roller Bearing, the 90000 type thrust cone Roller Bearing and the AXK type thrust roller Needle Bearing can withstand the uniaxial axial load, which is much larger than the thrust ball bearing's axial load capacity, and has large rigidity and occupies small axial space.
Thrust cylindrical roller bearing and thrust cone roller bearing are suitable for low rotational speed, and thrust cone roller bearing speed is slightly higher than that of thrust cylindrical roller bearing. The thrust cylindrical roller bearing is a separable bearing. It can only withstand one-way axial load and slight impact, and can restrict the axial displacement of the shaft (or shell) in one direction, so it can be used for unidirectional axial positioning. But its bearing capacity is far greater than that of the thrust ball bearing. When roller is rolling, the roller will inevitably slide on the raceway because of the different speed of the two ends of the roller. Therefore, the limit speed of this kind of bearing is lower than that of the thrust ball bearing, which is usually suitable for low speed operation.
The standard design of thrust cylindrical roller bearing adopts a metal solid cage. According to the requirements of the user, other types or materials can be used. The thrust Tapered Roller Bearing can only bear one direction axial load, which can limit the unidirectional axial displacement of the bearing, so it can be used as a one-way axial orientation. Compared with the thrust cylindrical roller bearing, the bearing capacity is large and the relative sliding is small, but the limit speed is low.
Thrust Roller Bearing
Thrust Roller Bearing,Small Thrust Bearing,Mini Thrust Ball Bearing,Thrust Needle Roller Bearing
LUOYANG AUTO BEARING CO.,LTD , http://www.ballbearing.nl