7MF Siemens pressure change delivery product introduction

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