Flange level transmitter

Flange level transmitter of the measured medium two kinds of pressure ventilation with high and low pressure chamber, role in the delta components (i.e., sensitive element) on either side of the segregation on the diaphragm, through spacer and components on both sides of the filling liquid to measure the diaphragm.Flange level transmitter is by measuring diaphragm and on both sides of the insulation on the electrodes of a capacitor.When we have different pressure on both sides, to cause measuring diaphragm displacement, the displacement and stress is directly proportional to the difference, so both sides capacitance range, through the link of oscillation and demodulation, is converted into is proportional to the pressure signal.The working principle of pressure transmitter and absolute pressure transmitter and differential pressure transmitter is the same, the difference is low pressure chamber pressure is atmospheric pressure or vacuum.

A/D converter to modem current is converted into digital signal, its value is the microprocessor is used to determine the input pressure value.

The microprocessor control transmitter.In addition, it is sensor is linear.Reset the measurement range.Engineering unit conversion, damping, prescribing, and sensors fine-tuning operations, as well as diagnosis and digital communication.

The microprocessor 16 bytes of RAM, and there are three 16-bit counter, one of them to perform A/D conversion.

D/A converter to the microprocessor and the correction of fine-tuning data, digital signal transmitter software to modify the data available.Within the block data is stored in EEPROM, even power is intact.

Provides a digital communication lines for transmitter and an external device (such as 205 type intelligent communication or control system using HART protocol) connection interface.The superposition of line detection in 4-20 ma signal of digital signal, and through the loop transfer the required information.The type of communication for the frequency shift keying FSK technology and on the basis of BeII202 standard.