ZRN1151DP capacitive differential pressure transmitter
1151 series of intelligent capacitive transmitter (hereinafter referred to as smart transmitters) is a microprocessor core pressure gauge, it increases the communications and other on the structure of a conventional capacitive transmitter 1151. With 268,275 Communicator other hosts or using HART protocol can control room, transmitter site or in any place in the same control loop with its two-way communication (read, write data and diagnostics).

1, the main features

1151 series of intelligent capacitive transmitter in addition to the inherent characteristics of the general capacitive transducer, but also has the following characteristics:
Intelligent electronic components consisting of only one
· Turndown ratio 15: 1 or 10: 1
· 0-0.6-0-42000KPa
· Place by span and zero adjustments
• You can update an existing TY-1151 (including 1151) a variety of analog transmitter smart meter
· Comply with HART protocol, HART Communicator can be used with this intelligent table 268 275 two-way communication without interruption output signal
• The HART protocol uses decentralized control system for two-way communication with the host
· With self-diagnosis and remote diagnostic functions
* With EEPROM, not afraid of power loss data
2, the working principle

Two pressure measured media through the high and low two pressure chambers, acting on the δ element (sensor) of both sides of the diaphragm, is transferred to the measurement on both sides of the diaphragm and filling liquid through the spacer element within. electrode measuring diaphragm on both sides of the insulating sheet each form a capacitor. When both sides of the pressure is inconsistent, resulting measuring diaphragm displacement, displacement, and proportional to the difference in pressure, it will not wait electrical capacity on both sides, by shaking and demodulation links, converted into a signal proportional to the pressure is the same as the pressure transmitter and absolute pressure transmitters and differential pressure transmitter works, except that the low-pressure chamber pressure is atmospheric pressure or vacuum. converter solution adjusting the current is converted into a digital signal, its value is used to determine the input pressure value microprocessor Microprocessor control efforts transmitter. In addition, it carried out the sensor linearization Reset measuring range. engineering unit conversion, damping, prescribing, sensor fine-tuning operations, as well as diagnostics and digital communications.
The microprocessor has 16 bytes of program of RAM, and has three 16-bit counter, which perform one A / D converter. Converter of the microprocessor and a digital signal by the corrected trimming data, which data is available Transmitter software modification data stored in the EEPROM, even if the power has preserved digital communication line to provide a transmitter with an external device (such as 275 intelligent communications device or a control system with HART protocol) connection interface. This line detection superimposed digital signal 4-20mA signal and transmit the required information via the loop. type of communication technology for the shift frequency control FS and based BeII202 standards.
In the differential capacitance detection principle composition capacitance transmitter, input pressures of 0 ~ 40KPa.
0 ~ 250KPa, etc. using the object: liquid, gas and vapor.