The straight rod type liquid level transmitter

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Straight rod type liquid level transmitter is diffused silicon or ceramic piezoresistive effect of s…

Products overview:

ZW - DB502 seriesThe straight rod type liquid level transmitter(hereinafter referred to as the transmitter) is the use of advanced electronic ceramic technology, dry without mediation fluid pressure measurement technology, has introduced its key-module international advanced level sensor diaphragm, it compared with currently used diffusion silicon type liquid level transmitter, there are two significant differences, different technology is measuring element with a new ceramic materials;One is there is no intermediary liquid in measuring element and is completely solid, and 500 series of products with excellent technical performance, the other generic products on the technical performance is difficult to meet our standards.

Second, the working principle:

ZW series - DB502 rods measured with static pressure type fluid shift delivering principle;When the liquid level transmitter into the liquid to be tested in a certain depth, the sensor to meet the pressure on liquid surface formula is: Ρ = rho. We + Po type:

P: the pressure on the transmitter into liquid level

Rho: the measured liquid density

G: the local acceleration of gravity

Po: atmospheric pressure on the surface of liquid

H: transmitter into the depth of the liquid

At the same time, through the gas leading stainless steel will be introduced to the liquid pressure sensor of positive pressure cavity, and atmospheric pressure on the surface of the liquid Po and sensors connected to the negative pressure cavity, to offset the Po on the reverse of the sensor, the sensor measured pressure is: rho. We, obviously, through the acquisition of pressure P, can get the depth of the liquid level.

Applications:

ZW series - DB502 straight rod type liquid level transmitter is the extension and development of technology of pressure transmitter.According to the different proportion of liquid in a linear relationship with different produced by high pressure principle, the implementation of the volume of water, oil and paste zhuang, accurate measurement and transmission of liquid height, weight.Widely used in electric power, petroleum, chemical industry, metallurgy, water conservancy, water, food and other industries

Four, the main features:

1, solid structure, no moving parts, high reliability, long service life.

2, from the water to the sewage from oil to viscosity larger liquid can be high precision measurement, not affected by blister, deposition of medium;

3, with multi-purpose mounting bracket, installation is convenient to use;

4, good anti-jamming, lightning-proof ability;

5, has the power supply reverse polarity protection and overload current limiting protection;

6, the new material is not easy to fatigue wear, vibration and impact resistance, strong overload capacity.

7, simple structure, easy to maintenance.

Five, the technical parameters:

1, the measuring range: stainless steel extension rod type 0 ~ 5 m;Guide gas cable type 0 ~ 100 m;

2, the system precision level: 0.2 magnitude 0.5 on the Richter scale;

3, using the environment humidity: - 20 ℃ ~ + 70 ℃;

4, relative humidity: 10% ~ 90%;

5, medium temperature: - 20 ℃ ~ + 80 ℃;

6, long term stability: better than 0.1% FS/year;

7, temperature stability: + 0.2% / 10 ℃;

8, power supply: : 24 VDC;

9, the signal output: two line 4 ~ 20 ma output.

Sixth, other parameters:

1, medium density range: 0.5 g/cm3 ~ 2.0 g/cm3.

2, overload ability: as 5 times as the standard range.

3, transmitter protection grade: IP65.

4, sensors, protection grade: IP68.

5, explosion-proof marks: iaIICT4 intrinsically safe;

6, transmitter shell material: membrane die-casting aluminum;

7, sensor material: type: stainless steel;Anti-corrosion type: ptfe;

8, fitting size: flange (PN2.5 (JB81-59);Thread M56 x 2.

Seven, installation and debugging methods:

1, cable type and lever type liquid level transmitter has many installation fixed way, so as to adapt to different site conditions.When the site will not be able to provide M20 x 1.5 in the process facilities such as thread or the flange, can choose wall installation type, horizontal pipe frame and vertical posture, such as three optional installation way, make you comfortable when installation.

2, when measuring liquidity larger medium, to prevent violent oscillation sensor, the user can choose counterweight attachment, to have the effect of stable sensors, add weight must to put weight objects in the bottom of the container, in order to avoid pull bad sensing wires.

In the field environment is bad, the user should choose sensor shield to protect sensor, to avoid the foreign body damage or affect the accuracy of measurement.

3, when using the lever type liquid level transmitter, if not metal containers, you need to put the transmitter of the shell with a wire access the bottom of the container, otherwise not accurate measurement.

This product in the factory has a calibration, if need on-site adjustment can adopt the following methods:

1, using intelligent circuit debugging methods:

The zero -- -- -- -- -- - when the liquid level position is low, at the same time hold down the "Z" key and "S" key 8 seconds after release at the same time, then "Z" key press, the output current automatically adjusts to 4 ma.

Field adjustable full -- -- -- -- -- - when the liquid level high, at the same time hold down the "Z" key and "S" key 8 seconds after release at the same time, then the "S" key press, automatic adjustment to 20 ma output current.

2, USES the method of analog circuit debugging:

When the liquid level in the next period, use the screwdriver slowly rotating "Z" potentiometer, observe the ammeter reading close to 4 ma.

When the liquid level in the limited time, use a screwdriver slow rotation "S" potentiometer, observe 20 ma current meter reading is close.

So above 2 to 3 times repeatedly, until zero and range are accurate 20 ma ma and 4, respectively.

After adjust, should tighten the lid of the transmitter.

Eight, measuring system:

Measurement system for this type.

This safety type pressure, differential pressure transmitter adopts the intrinsically safe circuit, suitable for explosion-proof grade ExiallCT4 - CT6 explosion danger area.

Shielding signal cable must be used in the system circuit, and reliable grounding.With only 4-20 ma output signal and the measurement system of 0 to 10 ma, for example the wiring diagram,

Liquid level transmitter has reliable operation, stable performance, small volume, light weight, low cost, refined design, a variety of structural form, easy installation, without stents.Circuit board USES the microprocessor based electronic technology, can automatically eliminate the influence of temperature change on the sensor precision.

This series of products can be equipped with LCD liquid crystal display (LCD), to facilitate the local operation.

Intelligent output with HART communication function at the same time.

Nine, note:

1, who supply products with instruction manual and the certificate of approval, including product number, technical parameters, production date, etc., please check carefully, lest use wrong.

2, connect the power supply shall be in strict accordance with my company connection wiring instructions.

Found in 3, the use of exception, should turn off the power and stop using, check, or directly to our technical department.

4 should be restored the original packaging, transportation, storage, stored in a cool, dry and ventilated warehouse.

Ten, selection of details:

1, indicate the measuring range (level of), for some special medium, indicate the density of the medium.

2, type selection, attention should be paid to contact with the product of the measured medium material compatibility, for special medium, can be customized.

More than 3, the product installation in the thunderstorm area, the order should be marked "lightning", recommend that users install against lightning protection device at the scene, and make sure products and power grounding.

4, about the selection of gas leading cable length: general than the actual level of 1 ~ 2 meters long.

Eleven, selection of coding:

Selection of code:

Twelve, design selection and ordering information:

1, model specifications: ZW - DB500 series;

2, the name of the measured medium, medium density;

3, instrument measuring range: can also be referred to as the nominal length;

4, work pressure, work under pressure;

5, working temperature: measuring the temperature of the liquid;

6, material requirements: liquid material;

7, whether matching supply flange, bolts, nuts, valves, fittings, such as sealing washer;

8, flange standard: nominal size of the flange, 3/4 ", DN25, (, DN80, DN100, etc;

9, special requirements: before ordering, please indicate in detail.

After-sales service commitment:

1, our company sold by liquid level transmitter series products within twelve months appear quality problem, is responsible for free maintenance.

2, the warranty period, any quality problems such as the products of our company, my company is responsible for free repair or replacement.

3, the warranty period, such as user improper use, damaged products, my company is responsible for the maintenance, charge damage parts cost.

4, after the warranty period appear quality problem, my company is responsible for the maintenance, charge damage parts cost.

5, such as user need to my company site services, to users in the province I company service personnel to reach the site within 12 hours, fujian association of foreign languages and user reach the site within 48 hours.