Differential pressure transmitter, China-Technology (certification), differential pressure transmitter

 As the name suggests, the transmitter containing the "change" and "send" means. The so-called "change" refers to the various physical quantities from the sensors, converted into an electrical signal. For example: the use of a thermocouple, the temperature was converted to an electrical potential; the use of a current transformer, the large current into a small current. Since the electrical signal easiest to deal with the principle of differential pressure transmitter, the differential pressure transmitter, modern transmitter, all the physical signals into electrical signals. Therefore, we say transmitters, usually becomes a "power." The so-called "free" refers to a variety of signals has become, in order to facilitate other instruments or control devices to receive and transmit, and again through the electronic circuit, the sensor's electrical signal, unified (eg 4-20MA). The method is achieved by a plurality of operational amplifiers. This "change" + "send" on the formation of the modern most common transmitter. Three-wire and four-wire transmitter with the above advantages are not about to be replaced by two-wire transmitter can be seen from a smattering transmitter chip supply and demand dynamics and the amount of foreign trade, current transducer when used to field devices installed in the power line, and a microcontroller as the core of the monitoring system are located further away from the equipment at the scene of the control room, both generally tens to hundreds of meters away and beyond. Device-site environment is more severe, strong signal will produce a variety of electromagnetic interference, lightning sensor will produce a strong surge pulses, in this case, a thorny issue microcomputer application system encountered is how distant in harsh environments reliable transmission of small signals. Two-wire transmitter output current is 4 ~ 20mA, through precision resistor 250Ω into an analog voltage signal 1 ~ 5V or 2-10V The conversion to a digital signal has a variety of methods, if the system is in the environment is more severe Long-term use of the industrial site, and therefore need to consider the safety and reliability of the hardware system works. Input Module system adopts LM231 voltage to frequency conversion device converts the analog voltage signal into a frequency signal differential pressure transmitter selection photocoupler device TL117 were analog and digital isolation. While the analog signal processing circuits and digital signal processing circuits using two independent power Honeywell differential pressure transmitter, analog and digital separated from each other, which can improve the security of the system work. Use VFC LM231 device also has some anti-high-frequency interference. In many applications, microprocessor controlled, have to use the transmitter to the microcontroller can not directly measure the signal into a single chip can handle the electrical analog signals, such as current transmitter, pressure transmitter, temperature transmitters, flow rate change delivery and so on. Differential pressure transmitter, China-Technology (certification), differential pressure transmitter is provided by Jinan-Technology Limited. Jinan Huahui Technology Co., Ltd. (www.cnhuahui.com/) Shandong Jinan, pressure meters leaders, over the years, the company implementing the scientific management, innovation and development, the principle of honesty and trustworthiness, and satisfy customer needs. - Technology leader in China with the staff warmly welcome all inquiries negotiations to create Hua Hui Technology better future.