1. summarize
2088 series diffused silicon pressure transmitter, using the world’s most advanced isolated diffused silicon pressure sensitive components and high quality integrated circuit assembly, it has the characteristics of high quality, low price, can adapt to various industrial applications, is the crystallization of diffused silicon precision machining + temperature compensation + analog signal processing technology, the main circuit process materials are advanced, The sealing and curing are completely isolated from the outside, which can meet the requirements of moisture-proof, waterproof, explosion-proof, anti-corrosion, dust-proof and other harsh conditions. The selection of different process connectors can accurately measure the strong corrosive media, high and low temperature media and viscous media.
2088 series pressure transmitters can be widely used in petroleum, chemical, steel, electric power, building materials, textile, pharmaceutical, food, gas, scientific experiments and military and other fields, to achieve the measurement, monitoring and control of pressure at each process point.
2088 series pressure transmitter, divided into ordinary and intelligent two types, the ordinary type provides standard DC 4-20mA signal output, intelligent in addition to optional HART communication, but also optional RS485 interface, it uses simple programming software to adjust the transmitter zero and range parameters.
2. How it works
The core of the 2088 series pressure transmitter is a diffused silicon sensor, which is ion implanted on the silicon substrate and modified by laser to make a Whiston bridge. The process pressure acts on the isolation diaphragm of the sensor to make the diaphragm displace, and is transferred to the silicon substrate through the silicone oil pressure in the membrane box. At the same time, the pressure at the reference end (atmospheric pressure, absolute pressure or sealed pressure) acts on the other measurement of the silicon wafer, so that a differential pressure is added to both sides of the silicon wafer, and the differential pressure creates a stress field on the silicon wafer, so that two of the four resistors of the Wheatstone bridge become smaller due to stretching, and the other two become larger due to compression, and the change is ΔR. The change in the resistance of the bridge arm throws the bridge off balance and produces a voltage output signal that is proportional to the pressure
Vout, Vout∝Vb× ΔR,
Since ΔR is proportional to the applied pressure, Vout=k×Vb×P+ V0 where Vout is the output voltage; k is the sensitivity coefficient; Vb is the bridge voltage; V0 is bridge zero output; P is the measured pressure Vout amplified by the output of differential normalized amplifier, and then converted into the corresponding current signal through the conversion of voltage and current. The current signal is compensated by the nonlinear correction loop, that is, the output of 4-20mA standard signal linearly corresponding to the input pressure is generated. Intelligent signal processing consists of a PIC14000 microprocessor and an input device capable of processing five signals at a signal conversion rate of at least 100 times per second.

3. Main features
a) Small size and light weight
Due to the use of American or Swiss sensor assembly with isolation diaphragm, and reliable
The modular processing circuit makes its volume only 1/3 of the capacitive pressure transmitter,
The weight is 1/5 of that of the capacitive pressure transmitter, which can be threaded directly without the need for mounting brackets.
B) High precision and good stability
Stable and reliable silicon piezoresistive chip, the highest accuracy can reach 0.2 or more, and through temperature correction, the temperature drift is within its highest accuracy range, long-term stability is good, thereby reducing the maintenance workload.
C) Reliable circuit, fast response speed
The advanced standard circuit of the United States is adopted, and the special material and process are cured into a special module, which can meet the use of various occasions (including: wet, dust, high temperature, vibration, explosive, corrosion and other occasions). The circuit has the reverse phase protection function, and the positive and negative electrodes will not be damaged.
D) Advanced diaphragm isolation technology
Advanced diaphragm/oil isolation technology is used to ensure a very small amount of oil to ensure a good pressure transfer function, improve the ability to resist the ultimate breaking pressure, but also improve the ability to prevent corrosion.
E) Intelligent interface, easy to expand
Intelligent type can be easily connected to a variety of intelligent display controller, inverter, PLC, DCS, PC, PDA and so on.
4. safe use precautions
(1) Handling and installing the transmitter should be careful to avoid collision and affect the performance of the circuit.
(2) There is an isolation diaphragm in the pressure inlet of the transmitter. Do not touch it with foreign bodies.
(3) The external thread of the transmitter must be sealed, otherwise it will cause the pressure to be unstable.
(4) The safety gate must obtain an explosion-proof certificate, and its installation should be carried out according to the requirements of its manual.
(5) If you encounter problems in the installation and use of the product, please contact our company. When the product is abnormal, please do not open it without authorization for repair, and contact the manufacturer in time.