Capacitive Absolute Pressure/Pressure Transmitter

I. Product Overview:

ZW1151AP series capacitive adiabatic/pressure transmitter is exquisitely designed with explosion-proof and all-weather structure. Installation, use and adjustment are convenient and simple. The terminal and amplifying circuit are placed in the upper airtight electric chamber and separated from each other. So the amplifier is still working in a sealed state when the field connection is made. The amplifying circuit has anti-polarity protection to prevent the transmitter from being damaged due to wrong connection. In order to adapt to the continuous improvement and development of domestic automation level, this series of products not only have compact and exquisite design, but also have the intelligent function of HART Fieldbus protocol.

II. Working Principle:

ZW 151AP series capacitive absolute pressure/pressure transmitter is used to measure two kinds of pressure of medium into high and low pressure chambers. It acts on the isolation diaphragm on both sides of the delta element (i.e. the sensitive element), and is transmitted to both sides of the measuring diaphragm through the isolator and the filling liquid in the element. A capacitor is formed by measuring the diaphragm and the electrodes on both sides of the insulating sheet. When the pressure on both sides is inconsistent, the displacement of the diaphragm is proportional to the pressure difference, so the capacitance on both sides is different, and the signal is converted into a signal proportional to the pressure through oscillation and demodulation. Like absolute working principle and differential pressure transmitter, the difference is that the pressure of low pressure chamber is atmospheric pressure or vacuum.

3. Application occasions:

One side of ZW1151AP series capacitive adiabatic/pressure transmitter receives the absolute pressure signal measured, the other side is closed into a high vacuum reference chamber, and then converts it into 4-20mA.DC signal output. It can measure absolute pressure of degassing system, distillation tower, evaporator and crystallizer.

Fourth, main characteristics:

1. Super measurement performance for pressure, differential pressure, liquid level and flow measurement;

2. Digital accuracy: +(-) 0.05%;

3. Stability: 0.25% for 60 months;

4. Range ratio: 100:1;

5. Measurement rate: 0.2S;

6. Miniaturized (2.4kg) stainless steel flange, easy to install;

7. Process connection is compatible with other products to realize measurement.

8. The only sensor in the world that uses H-alloy sheath (technology) achieves excellent cold and thermal stability.

9. Using 16-bit computer;

10. Standard 4-20mA, with HART-based digital signal, remote control supports upgrading to fieldbus and field control technology.

Technical parameters:

1. Targets: liquids, gases and vapors;

2. Measurement range: 0-1.6-10 Mpa;

3. Output signal: 4-20mA DC (special for four-wire system); 220V AC power supply, 0-10mA DC output;

4. Power supply: 12-45V DC, generally 24V DC;

5. Load characteristics: related to power supply, with load capacity at a certain power supply voltage; the relationship between load impedance RL and power supply voltage Vs is: RL < 50 (Vs-12);

6. Indicator table: pointer linear indicator 0-99% calibration and LCD liquid crystal display;

7. Explosion-proof grade: a: Exd II BT5 or Exd II CT6; b: intrinsically safe type (Exia II CT6 or Ex IB II CT6);

8. Range and Zero: External continuous adjustable;