The RS485 pressure transmitter RS85 RS85 transmitter of the signal pressure transmitter 
 AXB-04 intelligent pressure transmitter with a fully digital microprocessor smart pressure measurement instruments, is a small data acquisition and processing system. It consists of high-precision inlet pressure sensor, the operational amplifier, AD converter circuit, the CPU microprocessor, the compensation temperature sensor, interface, power supply and protection circuits, etc.. 
 First, the works 
 AXB-04 intelligent pressure transmitter before leaving the factory, using a dedicated calibration software, and apply standard pressure transmitter full scale at various temperatures to an accurate calibration, the formation of the calibration data, then store the calibration data to the transmitter in situ measurements of memory, the transmitter, both collected pressure signals, but also collected the ambient temperature signal after AD conversion, according to the ambient temperature data and the uncorrected pressure data, and then through the complex pressure-temperature drift compensation algorithm to calculate the correct pressure to show value. 
 Second, the main features of 
 Other manufacturers of conventional pressure transmitter, temperature drift indicators are given 0.03% FS / ° C drift at room temperature 20 ° C minimum. Pressure range 100MPa pressure transmitter in the winter -15 ° C outdoor use, not the pressure measurement accuracy, temperature drift, only backward (15 +20) × 0.03 = 1.05MPa, the error is too large. If the lower outdoor temperature or higher temperature processes, will bring a greater temperature drift, and the higher the pressure error. The AXB-04 intelligent pressure transmitter, completely overcome the weaknesses of the conventional pressure transmitter, completely eliminated by high-performance tracking of components and intelligent temperature compensation, temperature drift compensation temperature range within any environment temperature, can ensure that the measurement accuracy of the transmitter (in winter without any increase in the electric incubator, without considering the heat at high temperatures). Particularly suitable for the oil field, petrochemical field and a larger temperature difference between the harsh environment of the site, more suitable for high precision measurement field use. 
 AXB-04 intelligent pressure transmitter signal output RS485 interface, can support parallel, can be paralleled up to 255 on a 485 bus, eliminating the need for like 4 ~ 20MA conventional transmitters each one must be a separate connection a number of trouble. The transmitter output signal without going through the AD converter, received a computer serial port can be used directly through the 485/232 conversion interface. Hardware and software temperature compensation, and completely eliminate the effects of drift on the measurement accuracy of the pressure transmitter pressure. Wide voltage power supply, low power consumption. With reliable explosion-proof performance, has II A, II B, II C-level T1 and T6 group burst. 
 Third, technical indicators 
 Use: Liquid, gas, steam. 
 The pressure measuring range: 0 ~ 150MPa (optional). 
 Pressure measurement accuracy: 0.05,0.1,0.25,0.5% FS (optional). 
 Ambient temperature: -25 ~ 50 ° C (intrinsically safe), -40 to 125 ° C (non-intrinsically safe type) is optional. 
 Medium temperature: -40 ~ 125 ° C (optional). 
 Compensated Temperature Range: -40 to 125 ° C (optional). 
 Overload: 120% FS. 
 The scope of supply: DC5 ~ 12V (intrinsically safe type), DC5 ~ 24V (nonessential security type). 
 Operating Current: <15mA. 
 Signal Output: RS485. 
 Communication baud rate: 1200 38 400 bps. 
 Mechanical connection: M20 × 1.5