Pressure transmitters for electric combination units and intelligent pressure transmitters
Thread Content
I would like to ask everyone**: what is the difference between the pressure transmitters in electric combination units and intelligent pressure transmitters?
Automatic control instruments can be classified by generation as follows: Pneumatic instruments – air supply pressure of 0.14 MPa, signal transmission pressure of 0.02–0.1 MPa; DDZ Type I: uses vacuum tube components, powered by 220 V, with signal transmission at 0–10 mA; DDZ Type II: consists of discrete components, powered by 24 V, with signals transmitted at 4–20 mA； DDZ Type III: Integrated circuit, 24V power supply, 4-20mA ； Smart meters ； 24V power supply, digital communication signal ； Fieldbus instruments: Use fieldbus for signal transmission.
Simply put, smart meters are equipped with a CPU that enables digital communication; all digital meters can be connected via fiber optics, which makes things convenient and fast....
The electric combined unit instrument is a type of instrument manufactured by China’s older-generation instrument factories; four generations have been produced, namely DDZ-Ⅰ, DDZ-Ⅱ, DDZ-Ⅲ, and DDZ-S. The first three generations were analog instruments, while the DDZ-S is a hybrid digital-analog instrument; unfortunately, such instruments are no longer seen these days. Intelligent transmitters are mostly patented products from foreign companies; they use microprocessors, offer more functions (some of which may never be used in practice), are more expensive, and exhibit greater monopolistic tendencies.
Bro Pig, give your thoughts on the PDS pressure transmitter~~