Explosion-proof high static pressure differential pressure transmitter

I. Product Overview:

ZW3351HP series explosion-proof high static pressure differential pressure transmitter is used to measure liquid level, density and pressure of liquid, gas or steam under high working pressure environment, and then converted to 4-20 mA DC signal output. 3051HP can communicate with HART handheld devices, through which setting, monitoring and so on can be carried out. It chooses high static pressure diaphragm box. The so-called static pressure means that when the pressure on both sides of the pressure transmitter is the same, its output current should be 4 mA. But when the pressure on both sides of the ordinary differential pressure transmitter increases to 25 MPA at the same time, its output can not be guaranteed at 4 mA.

II. Working Principle:

ZW3351HP series explosion-proof high static pressure differential pressure transmitter measures two kinds of pressure of medium into high and low pressure chamber, which acts on the isolation diaphragm on both sides of the delta element (i.e. the sensitive element), and transmits them 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.

3. Application occasions:

ZW3351HP series explosion-proof high static pressure differential pressure transmitter can measure differential pressure under working pressure of 32 Mpa. Because of the 32 Mpa anti-working pressure and overload protection, it ensures that the transmitter can be used reliably in high static pressure system. Differential pressure transmitter is mainly used to measure the differential pressure, pressure, liquid level and density of liquid, gas or vapor, and then convert it into 4-20 mA.DC signal output.

Fourth, main characteristics:

1. High accuracy, good stability, two-wire system input (special four-wire system);

2. Solid components, plug-in printed circuit boards; small, light weight, strong anti-vibration;

3. Range, external zero point can be adjusted continuously, positive migration can reach 500%, negative migration can reach 600%.

4. Damping can be too adjustable and unidirectional overload protection has good characteristics.

5. No mechanical movable parts, less maintenance workload; a unified structure of the whole series, strong parts interchangeability;

6. The diaphragm material of contact medium can be selected; (316L, TAN, HAS-C, MONEL and other corrosion-resistant materials);

7. Explosion-proof structure, all-weather use; Intelligent HART Fieldbus protocol.

Technical parameters:

Performance Specifications: (Zero benchmark calibration range, reference conditions, silicone oil filling, 316L stainless steel isolation diaphragm.)

1. Reference accuracy:

(1) Digital and intelligent: +0.1% check full range.

(2) Simulated and linear: +0.2% calibration range.

2. Stability:

Number and Intelligence: 6 months, +0.1% URL.

(2) Simulated and linear: 6 months, +0.2% URL.

3. Environmental temperature effects:

Number and Intelligence: Zero Error: +0.2% URL/56 C, Total Error: +0.2% URL+0.18% Check Range) / 56 C.

(2) Simulation and linearity: Zero error: +0.5% URL/56 C, total error: +0.5% URL+0.5% check range) / 56 C.

4. Vibration effect: On any axis, the vibration effect at 200 Hz is +0.05% URL/g.

5. Power supply effect: less than +0.005% output range/volt.

6. Load effect: There is no load effect unless the supply voltage changes.

7. Electromagnetic Interference/Radio Frequency Interference (EMI/RFI): When the field intensity reaches 30V/M from 20 to 1000MHz, the output drift is less than (+0.1%).

8. Impact of installation location:

Under static pressure of 3 1027 kPa, it is + 0.2% URL. Zero error can be corrected online by zero adjustment. It can be corrected to <0.25% output reading/6895 kPa.

Functional specifications:

1. Measurement range:

Differential pressure: 0-1.3-6890KPa.

Static pressure: 25, 32 MPa.

2. Zero Point and Range:

(1) Digital and intelligent: can be adjusted by local range and zero button, or remote adjustment by HART hａnd manipulator;

(2) Simulation and linearity: range and zero point can be adjusted continuously.

3. Zero positive and negative migration: When zero negative migration occurs, the lower limit of range must be greater than or equal to - URL; when zero positive migration occurs, the upper limit of range must be less than or equal to + URL. The calibration range must be greater than or equal to the Zui small range.

4. Output:

Digital and Intelligent: 4-20mA DC, users can choose linear or square root output. The digital process variables are superimposed on 4-20 mA signals, which can be used by the host computer using HART protocol.

(2) Simulation and linearity: 4-20 mA DC, linearity with process pressure.

6. Installation requirements and precautions:

1. Before installation, please read the product instructions carefully and check the relevant information of the product.

2. Transmitters should be installed in ventilated, dry, non-corrosive and shady places. If installed in the open air, protective shields should be added to avoid sunshine and rain, and to avoid performance degradation or failure of transducers.

3. Transmitter is a precise instrument. When installed, avoid strong impact and smash.

4. Connect correctly according to wiring diagram.

5. Attention should be paid to protecting the lead-out cable of the transmitter. It is suggested to use metal pipe to protect or overhead when using in industrial field. Do not loosen the sealing nut of the cable lead-out end to avoid moisture entering.