Input type liquid level transmitter

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Input type liquid level transmitter is a kind of measuring the pressure of liquid level sensor, base…

Products overview:

ZW - DB501 seriesInput type liquid level transmitterPart of the measured medium, directly into the transmitter can use flange or bracket, installation is very convenient.Solid state structure, no moving parts, high reliability, long service life from water and oil to high-precision measurements, larger paste viscosity can not be measured medium blister, deposition, the influence of the electrical characteristics of wide range of temperature compensation.With a power supply reverse polarity protection and overload current limit protection.Can be used in high temperature and high pressure, strong corrosion, easy to crystallization, prevent jams, prevent cold junction and under special conditions, such as solid powder, granular material level, material level or the level of continuous testing, are widely used in various industrial control in the process of detection.

Second, the working principle:

ZW series - DB501 investment 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 - DB501 input type liquid level transmitter can be applied to high pressure, strong corrosion, easy to crystallization, easy to jam, prevent the liquid level under special conditions such as cold junction of continuous testing, can be widely used in electric power, metallurgy, chemical industry, food, pharmaceutical and other industries and sewage treatment, boiler steam drum, pulverized coal level measurement of packages and other places.

Four, the main features:

1, directly into the internal measurement of medium level;

2, USES the high performance ion silicon piezoresistive sensor;

3, into cable and isolation diaphragm material can be chosen for convenience;

4, the built-in lightning resistance circuit, thunderstorm more convenient use;

5, all stainless steel argon arc welding technology to ensure watertight;

6, the real full isolation, isolation voltage sensor and the main circuit of 500 VRMS;

7, solid structure, no moving parts, high reliability, long service life;

8, out of the water and oil to the larger paste viscosity measurement can be performed;

9, from sparkling measured medium, deposition, the influence of the electrical characteristics of wide range of temperature compensation;

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

11, can be directly into the measured medium, install and use is very convenient.

Five, the technical parameters:

1, the measuring range: 0-0.1 m ~ 0 to 35 meters;

2, overload: 1.5 times less than length;

3, survey forms: balanced bell type;

4, precision grade: 0.5% F?S;

5, power supply voltage: 24 VDC;

6, load resistance: 500 Ω or less;

7, measuring medium: all kinds of liquid.

8, long term stability: plus or minus 0.2% F?S/year;

9, environment relative humidity: 0 ~ 95%;

10, compensation temperature: 0 ~ 70 ℃;

11, the working temperature: - 40 ~ 240 ℃ high temperature zui can do 350 degrees (customized);

12, shell: die casting aluminum alloy;

13, the main structure materials: 1 cr18ni9ti;

14, electrical interface: M20 x 1.5.

Six, measurement 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.Below are just 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.

Seven, the debugging methods:

Unscrewed the cap, you can see the zero and full range resistor, an external power supply and the current meter (0.2 or above), standard can be adjusted, the steps are as follows:

1, in the absence of liquid in the transmitter, adjust the zero resistor, make the output current of 4 ma;

2, add liquid to full scale in the transmitter, adjust full range resistor, make the output current of 20 ma;

3, the above steps two or three times repeatedly, until the signal is normal;

4, adjustment, tighten the protection cover.

Eight, to install:

1, the liquid level meter installed in the stillness of the deep well, sink, usually take around 45 mm diameter Φ steel pipe (different height to play several holes, so that the water flow into the tube) fixed in the water, then put type liquid level transmitter can be used in the steel pipe;

2, measuring flow, or have a mixing liquid level, usually take around 45 mm diameter Φ steel pipe (different heights on the opposite side of the liquid flow to play several holes, so that the water flow into the tube) fixed in the water, then put type liquid level transmitter can be used in the steel pipe;

3, the installation of the transmitter is in the vertical, the inputting type installation position should be far away from the liquid accesses and stirrer;

4, in the use of larger vibration occasions, can be on the transmitter winding wire, using steel wire suspension, so as to avoid tensile cables.

Nine, installation considerations:

1, due to the bottom of the tank or tank bottom easy deposition sludge, the content such as diesel, suggested leaving measuring probe tank (tank) at the end of a certain height, so as to avoid debris jam probe;

2, in the volatile medium, gas leading cable long, should be adopted to probe the sleeve should be fixed, in case the probe swings which might affect the accuracy of measurement;

3, when transmitter installation side, gas leading the bending radius should be more than 10 cm, to avoid excessive bending and will guide gas cable damage;

4, the inputting type liquid level transmitter earthing terminal shall be reliable grounding, power shielded wire should be connected with;

5, measuring, and explosive dangerous goods must be in strict accordance with the GB3836.1-83 "explosive environment with explosion-proof electrical equipment of general requirements and GB3836.4-83" intrinsically safe circuit and electric equipment "I", "the relevant provisions of the installation.

Ten, use notice:

1, use found abnormal, should turn off the power and stop using, for inspection or to the technology department;

2, connect the power supply shall be in strict accordance with the huaian three chang instrument manufacturing co., LTD., connecting wiring instructions;

3, liquid level transmitter should be restored the original packing, transportation, storage in a cool, dry and ventilated warehouse.

Eleven, selection of coding:

Twelve, design selection and ordering information:

1, model specifications: ZW - DB700 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.