What is a pressure transmitter?
Digital pressure transmitters used quartz crystal frequency-output sensors to measure parameters along with integrated microprocessor capability to provide intelligent pressure transmitters. These transmitters, which operate in the field, can provide comparable performance to basic standards.
Placing information in the transmitter simplifies the settings for the user and allows the transmission of data to the control system and the host via two wires.
Quartz electric pressure sensors :
Quartz pressure sensors provide high accuracy in digital pressure transmitters.
Dynamic pressure measurements can be made using quartz sensors in which applied force generates an electric charge across the crystal.
Applying force in the direction of one of the neutral axes Y establishes an electric charge at right angles to it on the surfaces of the polar axis.
The size of this load depends on the dimensions of the quartz crystal, and by choosing the right shape, high load performance with good linearity and low temperature sensitivity can be guaranteed.
Digital pressure transmitter architecture :
The electronic architecture of the smart digital pressure transmitter is shown in the following figure:
The digital interface display includes a counter, microprocessor, RS-232 serial port, RS-485 serial port, and EPROM and EEPROM memory to store operating program and calibration coefficients.
The microprocessor controls the input commands. The microprocessor selects the appropriate frequency signal source when receiving the sampling command and uses a high-frequency integration time and user-specified integration time to measure the period.
The parameter measurement is transmitted from the microprocessor via the RS-232/485 bus. The RS-232 / RS485 interface controls all transmitter operations, including resolution, sample speed, integration time, baud speed, pressure mixer and pressure multiplier.