Flange Differential Pressure Transmitter

I. Product Overview:

ZW3051LTC series flange differential pressure transmitter can measure the accuracy of liquid level and density of various containers. It is suitable for measuring high viscosity medium or suspended liquid. Installation flange standard according to ANSI, flange has 3 "ａnd 4" specifications, flange grade is 150 LB (2.5 MPa) and 300 LB (5.0 MPa). If user adopts GB9116-88 standard, DN = 80, 100, PN = 2 MPa, please specify. Because the isolation diaphragm is very thin, it is the weak link of corrosion resistance, so the liquid-contacting diaphragm material has 316L, Harrington C-276, Monel, Tantalum and so on. It can be applied to different anti-corrosion requirements, and can be reasonably selected according to the measured medium concentration, humidity, pressure and other parameters, which are suitable for the appendix to give the reference table of corrosion resistance. If corrosiveness is strong, anti-corrosive structure transmitter can be selected. When the user does not specify, the product is supplied with 3 "150LB installation flange and 316L liquid-contacting diaphragm material.

II. Working Principle:

The working principle of ZW3051LTC series flange differential pressure transmitter is a capacitor composed of measuring diaphragm and electrodes on both sides of 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. 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 ZW3051LTC series flanged differential pressure transmitter is the same as that of pressure transmitter. In order to meet different installation requirements, this series of transmitter has a variety 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.

Technical parameters:

1. Output signal: 4-20MA.DC two-wire system (analog) two-wire system 4-20mA DC signal is superimposed with digital signal, and the user chooses linear or square output. (Intelligent)

2. Power supply: 12-45V.DC.

3. Load characteristics:

Power supply effect: <0.005% output range/V;

Load effect: When the power supply is stable, there is no load effect.

Measurement accuracy: Adjust the range of measurement (+0.1%) and (+0.2) the standard accuracy is (+0.2)%. If you choose other accuracy, please specify when ordering.

Range ratio: 10:1 or 100:1;

Damping: Usually it can be adjusted between 0.1 and 16 seconds. When inert liquid is filled or remote transmission device is used, the time constant will increase.

Start-up time: <2 seconds, no preheating.

4. Working environment: ambient temperature - 29-93 C (analog amplifier);

- 29-75 C (digital/intelligent amplifier);

- 29-65 C (with display head);

The ambient humidity is 0-95%.

5. Protection characteristics: protection capability IP65;

6. Explosion-proof type: Exd II BT4-6;

Intrinsically safe Exia II CT5.

7. Static pressure effect: Zero error: +0.5% Zui large range limit, for 32 MPa under pipeline pressure through zero correction.

8. Electromagnetic radiation effect: 0.05% Zui large range value, receiving radiation frequency 27-500 MHz, test field strength 3V/m.

9. Indicator (%): LCD digital display accuracy (+0.2%).

10. Vibration effect: 200 Hz vibration in any direction, +0.05%/g.

11. Installation position: The diaphragm is not installed vertically, which may cause zero error less than 0.24KPa, but can be corrected by zero adjustment.

12. Weight: 3.9Kg (excluding accessories).

6. The difference between pressure transmitter and flange transmitter is as follows: