Capacitive Diaphragm Pressure Transmitter

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I. Product Overview:

ZW3051LT series capacitive diaphragm pressure transmitter adopts advanced microprocessing technology and digital communication technology. In addition to all the functions of conventional intelligence, it also has a series of enhanced functions, such as automatic zero adjustment, remote in-situ control parameter viewing and password lock adjustment of control parameters, etc. At the same time, through field bus HART protocol, remote parameter setting, remote control, self-diagnosis and other functions are carried out. Fieldbus is a bidirectional digital communication system, an innovative technology for configuring instrumentation control system, and also a promising replacement product. It is used to replace the standard 4-20mA analog communication widely used in field instruments.

II. Working Principle:

The principle of ZW3051LT series capacitive diaphragm pressure transmitter is that a capacitor is composed of the measuring diaphragm and the electrodes on both sides of the insulating diaphragm. 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. Through oscillation and demodulation, the diaphragm is converted into a signal proportional to the pressure, and then transformed into a standard electrical signal through temperature compensation and linear correction.

3. Application occasions:

The main structure of ZW3051LT series capacitive diaphragm pressure transmitter is the same as that of pressure transmitter. In order to meet the different installation requirements, this series of transmitter has many kinds of remote transmission devices for users to choose. This product is widely used in petroleum, chemical, power, food, paper, municipal engineering and other industries.

1. Viscous media at high temperature;

2. Easy to crystallize medium;

3. Precipitable media with solid particles or suspended solids;

4. Strong corrosive or highly toxic media;

It can eliminate the leakage of the guide pipe and pollute the surrounding environment, and avoid the tedious work of supplementing the isolation fluid frequently because of the instability of the measurement signal when using the isolation fluid.

5. Continuous and accurate measurement of interface and density;

The remote transmission device can avoid the mixing of different instantaneous media, so that the measured results can truly reflect the actual situation of process changes.

6. occasions with high requirements for hygiene and cleanliness;

For example, in the production of food, beverage and medicine industry, it is not only required that the contact media parts of transmitters meet the hygienic standards, but also should be easy to rinse to prevent cross-contamination of different batches of media.

Fourth, main characteristics:

1. The direction of the new indicator, intuitive reading, eye-catching and observation indicator can be changed according to the user's needs.

2. Simple structure: no movable or elastic components, so it has high reliability and little maintenance.

3. Easy to install: The built-in structure shows this characteristic, and no special tools are needed.

4. Easy to adjust: Zero and range potentiometers can move zero or change range arbitrarily within the effective range of liquid level detection, and the two adjustments do not affect each other.

5. It is widely used in liquid level measurement of medium such as high temperature, high pressure and strong corrosion.

6. The measurement range is large and is not limited by the height of the storage tank.

7. The indicating mechanism is completely isolated from the measured medium, with good sealing, high reliability and safe operation.

8. It has intrinsically safe explosion-proof and isolation explosion-proof capability and can be used in various dangerous places.

9. The liquid level of pasty media can be measured by anti-blocking design.

10. Fine and unique zero point, full range, non-linear compensation to ensure the accuracy of the instrument within the use conditions, long-term stability is good.