⎝⎛星力捕鱼⎞⎠

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Flow meter series
Temperature instrument series
Pressure instrument series
Calibration instrument series
Level instrument series
Digital display instrument series
Transmitter instrument series
Wire and cable series
Bridge instrument cabinet series
Pipe fitting valve series

Address: Xiongyi, Jinhe Road, Jinhu County, Jiangsu Province
Lunan
Phone: 0517-86900901
0517-86900921
0517-86900920
Fax: 0517-86900902
Postcode: 211600
http://zzyfwh.com
Email: chinadongxiang@163.com
Transmitter instrument
Capacitive transmitter

Capacitive transmitter
Capacitive transmitters are widely used in industry. For example, they are widely used in petroleum, chemical and other industries. Capacitive transmitters are used in conjunction with other products.
Capacitive transmitter working principle


The two pressures of the measured medium pass into the high and low pressure chambers, and act on the isolation diaphragms on both sides of the delta element (ie, the sensitive element), and are transmitted to both sides of the measurement diaphragm through the spacer and the filling liquid in the element. Capacitive transmitters are composed of a measuring diaphragm and electrodes on both sides of the insulating sheet. When the pressure on the two sides is inconsistent, the measurement diaphragm is displaced. The displacement is proportional to the pressure difference, so the capacitance on both sides is not the same. Through the oscillation and demodulation links, it is converted into a signal proportional to the pressure. Capacitive pressure transmitters and capacitive absolute pressure transmitters work the same as differential pressure transmitters, except that the pressure in the low-pressure chamber is atmospheric or vacuum. The A / D converter of the capacitive transmitter converts the current of the demodulator into a digital signal, and its value is used by the microprocessor to determine the input pressure value. In addition, it performs operations such as sensor linearization, resetting the measurement range, engineering unit conversion, damping, rooting, and sensor trimming, as well as diagnostics and digital communications.
Analog characteristics
1. High accuracy Analog accuracy: + (-) 0.75% + (-) 0.1% FS
2.The range and zero are continuously adjustable externally
3. Good stability
4, positive migration can reach 500%, negative migration can reach 600%
5. Second-line system
6, adjustable damping, resistance to over-voltage
7.Solid sensor design
8, no mechanical moving parts, less maintenance
9. Light weight (2.4kg)
10.The entire series has a unified structure and strong interchangeability
11, miniaturization (166mm total height)
12.The material of the diaphragm that contacts the medium is optional
13, unilateral anti-overpressure
14. Intelligent features of low-pressure cast aluminum alloy shell:
1. Super measurement performance for pressure, differential pressure, liquid level and flow measurement
2. Digital accuracy: + (-) 0.05% Full performance: + (-) 0.25FS
3. Stability: 0.25% for 60 months
4. Range ratio: 100: 1
5. Measurement rate: 0.2S
6. Miniaturized (2.4kg) all stainless steel flange, easy to install
7. The process connection is compatible with other products to achieve the best measurement
8. The only sensor (patented technology) with H alloy sheath in the world, which achieves excellent cold and heat stability
9.Smart transmitter using 16-bit computer
10. Standard 4-20mA, with digital signal based on HART protocol, remote control
11. Support the upgrade to fieldbus and field control-based technology.