Clamp diaphragm pressure transmitter

Transmitter Series>>ZW1151W Clamp Sanitary TypeDiaphragm pressure transmitter：

1、 Instrument Overview:
Clamp diaphragm pressure transmitterUsing high-performance pressure-sensitive chips, combined with * circuit processing and temperature compensation technology, pressure changes are converted into linear current or voltage signals. The product has HATR communication, communication and self diagnostic functions. Users can use handheld terminals or fieldbus systems to remotely transmit, read, display and input all working information and additional information of the transmitter. It can be used to measure gauge pressure, negative pressure, and absolute pressure.

2、 Measurement principle:
Clamp diaphragm pressure transmitterThe principle is that a capacitor is composed of a measuring film and electrodes on both sides of the insulating film. When the pressure on both sides is not equal, it causes displacement of the measuring diaphragm, and the displacement is proportional to the pressure difference. Therefore, the capacitance on both sides is unequal. Through oscillation and demodulation, it is converted into a signal proportional to the pressure, and then converted into a standard electrical signal through temperature compensation and linear correction.
3、 Applicable signals:
The main structure of the pressure transmitter is the same as that of the pressure transmitter. In order to meet different installation requirements, this series of transmitters has multiple forms of remote transmission devices for users to choose from. This product is widely used in industries such as petroleum, chemical, power, food, papermaking, and municipal engineering.
1. Viscous media at high temperatures;
2. Medium that is prone to crystallization;
3. Settling media with solid particles or suspended solids;
4. Strong corrosive or highly toxic media;
Can eliminate the occurrence of pressure pipe leakage and pollution of the surrounding environment; It can avoid the tedious work of frequently replenishing isolation fluid due to the instability of measurement signals when using isolation fluid.
5. Continuous measurement of interface and density;
The remote transmission device can avoid the mixing of different instantaneous media, thus enabling the measurement results to truly reflect the actual situation of process changes.
6. Places with high hygiene and cleanliness requirements;
In the production of food, beverage, and pharmaceutical industries, not only is it required that the contact area of the transmitter with the medium meet hygiene standards, but it should also be easy to rinse to prevent cross contamination of different batches of media.
4、 Performance characteristics:
1. The indication is novel, the reading is intuitive, eye-catching, and the direction of the observation indicator can be changed according to the user's needs.
2. Simple structure: without any movable or elastic components, therefore reliable and requires minimal maintenance.
3. Easy installation: The built-in structure particularly demonstrates this feature, requiring no tools.
4. Easy adjustment: The zero position and range potentiometers can be used to freely shift the zero position or change the range within the effective range of liquid level detection, and the two adjustments do not affect each other.
5. Widely applicable; Suitable for liquid level measurement in media with high temperature, high pressure, strong corrosion, etc.
6. The measurement range is large and not limited by the height of the storage tank.
7. The indicator mechanism is isolated from the tested medium, with good sealing, high reliability, and safe use.
8. Equipped with intrinsic safety explosion-proof and isolation explosion-proof capabilities, it can be applied to various hazardous locations.
9. It has an anti blocking design that can measure the liquid level of paste like media.
10. Fine zero point, full range, and nonlinear compensation ensure the accuracy within the range of instrument usage conditions and good long-term stability.
5、 Technical indicators:
1. Output signal: 4-20mA DC two-wire system (analog) Two wire system 4-20mA DC signal is superimposed with a digital signal, and the user selects linear or square root output. (Intelligent type)
2. Power supply: 12-45V.DC.
3. Load characteristics:
Power supply impact:<0.005% output range/V;
Load impact: When the power supply is stable, there is no load impact;
Measurement accuracy: ± 0.1% of the calibration range, ± 0.2. The standard accuracy is ± 0.2%. If other accuracies are selected, please indicate them when ordering and selecting;
Range ratio: 10:1 or 100:1;
Damping: usually adjustable between 0.1 and 16 seconds, the time constant increases when filled with inert fluid or with a remote transmission device;
Start time:<2 seconds, no preheating required.
4. Working environment: ambient temperature -29~93 ℃ (analog amplifier);
-29~75 ℃ (digital/intelligent amplifier);
-29-65 ℃ (with display header);
The environmental humidity is 0-95%.
5. Protection features: IP65 protection capability;
6. Explosion proof type: Explosion proof Exd II BT4-6;
Intrinsically safe Exia II CT5.
7. Static pressure influence: Zero position error: ± 0.5% maximum range limit, corrected by zeroing for 32MPa under pipeline pressure.
8. Electromagnetic radiation impact: 0.05% maximum range value, accepted radiation frequency of 27-500MHz, test field strength of 3V/m.
9. Indicator (%): LCD digital display accuracy ± 0.2%.
10. Vibration effect: ± 0.05%/g when vibrating at 200Hz in any direction.
11. Installation position: The diaphragm is not installed vertically, which may result in a zero point error of less than 0.24KPa, but it can be corrected by adjusting the zero point.
12. Weight: 3.9Kg (excluding accessories).
6、 Attention to application process matters:
1. When measuring liquid pressure, the installation position of the flange level transmitter should avoid the impact of the liquid (i.e. water hammer phenomenon) to prevent damage to the sensor due to overpressure.
2. When a single flange liquid level transmitter freezes in winter, anti freezing measures must be taken for outdoor transmitters to prevent the liquid in the pressure inlet from expanding due to freezing and causing damage to the sensor.
3. When wiring, thread the cable through the waterproof joint (accessory) or flexible tube and tighten the sealing nut to prevent rainwater and other substances from leaking into the transmitter housing through the cable.
4. When measuring liquid pressure, the pressure tap should be opened on the side of the process pipeline to avoid sedimentation and slag accumulation.
5. To prevent the flange liquid transmitter from coming into contact with corrosive or overheated media, and to prevent slag from depositing in the conduit;
6. When measuring gas pressure, the pressure tap should be opened at the top of the process pipeline, and the flange level transmitter should also be installed at the upper part of the process pipeline to allow the deposited liquid to be quickly injected into the process pipeline.
7. Attention should be paid to installing the pressure tube of the sensor in a location with minimal temperature fluctuations;
8. When measuring steam or other high-temperature media, a condenser such as a buffer tube (coil) should be connected, and the operating temperature of the transmitter should not exceed the limit.
7、 Selection List:

8、 Ordering Notice:
1. The transmitter model can be determined according to the selection specification table as needed.
2. The numbers and symbols in the selection specification table must be filled in clearly and accurately.
3. If there is positive or negative migration, the migration amount value must be indicated.
4. If a differential pressure transmitter needs to be equipped with a three valve group, it needs to be specified separately.
5. When selecting a remote transmitter, it should also be determined according to different remote flange selection tables as needed.
6. If the remote transmitter is to be used in vacuum and high temperature environments, it should be specially marked when ordering.
7. The materials for contact medium O-ring seals include rubber and fluororubber.
8. Unless otherwise specified, the filling fluid at the factory is silicone oil.

After-sales service
1. The instrument series products sold by Zhongwei ensure the sale of products and spare parts at the same price within two years, and provide corresponding free of charge according to the requirements of the demand.
2. If there are any quality problems with the products provided by our company within one year (excluding vulnerable parts or accessories), we will be responsible for free repairs and provide free skill training for the employees of the demand side.
3. Due to quality issues with the products provided by our company, after verification by our technical department, we will dispatch professional technicians to the site to handle the problem until customer satisfaction is achieved.
4. Outside the warranty period, the product will be returned to the company for repair or sent to the user for repair.
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