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| add time： | 2016-01-15 10:51:58 |
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Negative pressure transmitter is two kinds of pressure of the medium to be measured to pass into the low and high pressure chamber, the role of the delta components (i.e. responsive element) on both sides of the isolation diaphragm, isolation and the element by filling liquid is transferred to a measurement on both sides of the membrane. The negative pressure transmitter is a capacitor which is composed of a measuring diaphragm and an electrode on both sides of the insulating sheet. When both sides of the pressure is not consistent, resulting in the measurement of the diaphragm displacement, the displacement and pressure difference is proportional to the two sides of the capacitance range, through the oscillation and demodulation process, and the pressure is converted into a signal. The working principle of the negative pressure transmitter and the pressure transmitter is the same as that of the differential pressure transmitter.
The A/D converter converts the current of the demodulator into a digital signal, and the value is used by the microprocessor to determine the input pressure value. Microprocessor control transmitter. In addition, it makes sensor linearization. Reset measurement range. Engineering unit conversion, damping, prescribing, fine-tuning operations, sensors, and diagnostic and digital communication.
This microprocessor has 16 byte program RAM, one of which performs /D A conversion.
The D/A converter converts the microprocessor to the corrected digital signal to fine tune the data, and the data can be modified by the transmitter software. Data is stored in the EEPROM, even when the power is off.
Digital communication lines for the transmitter to provide the interface of a with external devices (such as 205 intelligent communicator or with HART protocol control system). The circuit detects the digital signal superimposed on the 4-20mA signal, and transmits the required information through the loop. Type of communication for frequency shift keying FSK technology and based on BeII202 standard. Negative pressure transmitter can be used to measure negative pressure 100KPa, which is mainly used to measure the pressure in the vacuum state.
Performance characteristics
Simulated type
High - precision
Zero - range, external adjustable
- good stability
Up to 500%, up to 600% - positive transfer negative transfer
- wire system
The adjustable damping resistance, overvoltage
The design of solid state sensors
No mechanical moving parts, less maintenance
The light weight (2.4kg)
The full range of unified structure, strong interchangeability
The small (166mm high)
Optional - contact medium diaphragm material
Anti - unilateral pressure
The low pressure casting Aluminum Alloy shell
intelligent
For the super - performance measurement, pressure, differential pressure, liquid level, flow measurement
The digital accuracy: + (- 0.05%)
The simulation accuracy: + (-) 0.75%+ (-) 0.1%F.S
- Performance: + (-) 0.25F.S
Stability: 0.25% - 60 months
- range: 100:1
The measurement rate: 0.2S
The miniature (2.4kg) stainless steel flange, easy to install
The process of connecting the compatibility with other products, to achieve the best measurement
The world's only using H alloy sheathed sensor (patent technology), achieved excellent cold and thermal stability
Adopt 16 bit computer intelligent transmitter
The standard of 4-20mA, a digital signal based on HART protocol, remote control
- support to the field bus and based on field control technology upgrades.
