Explosion-proof type rf admittance level switches

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Explosion-proof type radio frequency admittance level switch is the replacement of the capacitive ma…

A, instrument overview:

ZW - L2000C seriesExplosion-proof type rf admittance level switchesIs a kind of developed from the condenser, hanging applicability broader, more reliable, more accurate, a new type of material level control technology, is the capacitive material level technology upgrade.So-called rf admittance, the meaning of the admittance to the reciprocal of electrical impedance in, its element by resistive, capacitive component, the perceptual component integrated, and radio frequency or high frequency radio spectrum, so the radio frequency admittance can be understood as admittance is measured with a high frequency radio waves.Instrument, instrument of the sensor and the tank wall and forming admittance values measured medium, level changes, admittance values change accordingly, circuit unit convert measurement admittance values into material level signal output, to achieve material level measurement.

Second, the working principle:

ZW - L2000C series explosion-proof type radio frequency admittance level switch consists of a sensor unit and electronic unit.Sensor unit mainly includes three parts: measuring extremely extremely, shielding and grounding terminal, the height of the material reflects for agent and the change of the container wall between admittance, when material arrived in switch, electronic unit to respond, drive the action of the relay, switch signal output.Shaded pole can prevent the misoperation arising from electrode has a hanging signal, only when the material reaches the set point, real output relay on-off signals.

Three, the application object:

ZW - L2000C series explosion-proof type rf admittance level switches are widely used, several typical situations are as follows: chemical plastic film;Feed/grain rubber drugs;Liquid waste sand;Food mud cement;Powdered coal body paint/coatings;Granular solid oil pulp, etc.

Three, the application of medium:

1, power plants, coal, raw coal, fuel storage, reservoir, exhaust gas purification tank, pump, ash library, tank, etc.;

2, oil fields, crude oil or refined oil storage tanks, three-phase separator, sedimentation tank, sewage tank, oil-water interface and drilling mud tank, etc.

3, chemical: crude distillation tower, raw materials and intermediate bunker tank, reaction tank, ammonia, solid bin, separator, etc.;

4, metallurgy, ore bin, ore mill, raw material warehouse, accessories warehouse, blast furnace, alumina powder storehouse, electrolytic cell buffer tank, etc.;

5, cement, stone warehouse, pulverized coal bunker, cement warehouse, warehouse, slag storage warehouse, etc.;

6, water treatment, water, sewage pool, cans, sedimentation tank, deep well water treatment, drinking water network, etc.;

7, paper making, raw material warehouse, towers, drum drying, chemical storage materials storage warehouse, etc.;

8, other: quarry, food, pharmaceutical, environmental protection, shipbuilding and other industries.

Four, the main features:

1, strong commonality: measuring liquid level and material level, can satisfy the measurement requirements of different temperature, pressure, medium, zui high temperature is 800 ℃, zui up to 5 mpa pressure, and can be applied to negative situations, such as corrosion, impact.

2, prevent hanging: unique circuit design and the sensor structure, can make its measurement is not affected by sensor hanging, without regular cleaning, avoid measurement by mistake.

3, avoid d n: measurement process is no moving parts, no mechanical parts damaged problems, do not need to maintain.

4, dry anti-disturbance: non-contact measurement, anti-interference ability is strong, can overcome the steam, foam and mixing effect on the measurement.

5, accurate and reliable: measuring amount of diversification, makes the measurement more accurate, measurement is not affected by climate change, high stability, long service life.

Five, the technical parameters:

1, power supply: 220 vac - 50 vac 50/60 hz (standard);

110 vac + 25 vac 50/60 hz (standard).24 vac + / - 5 vac (optional);

2, output: DPDT relay (double pole double throw);

3, the output capacity: 220 vac 5 a;

4, the environment temperature: - 40 ℃ ~ 70 ℃;

5, medium temperature: 100 ℃ ~ 800 ℃;

6, in distinguishing rate: < 0.5 PF;

7, after sex: < 1 mm (conductive medium);< 10 mm (dielectric);

8, response time: < 0.5 s;

9, when delay: 1 ~ 50 s;

10, high and low alarm: the scene can be set up for the HLFS (high alarm way) or produce (low alarm) spark protection (of sensor) : built-in spark protection circuit;

11, electrical interface: M20 * 1.5;

12, the electric cable: split type electronic unit dedicated connections between the sensor and cable standard 5 m, zui 50 m long;

13, process connection: the NPT thread installation (standard);Flange installation (optional);

14, shell protection: IP66;

15, explosion proof: Exd iallct4 [1].

Six, installation requirements:

1, radio frequency admittance switch can be installed vertical and horizontal.

2, when installation, must guarantee that the center of the sensor sheath maerial and shielding layer and vessel wall (or installation) each other contact, good insulation, install the threaded connection is firm, with the walls and electrical connection is good, and probe the shield will enter inside the container.

3, with stirring, probe need to support or anchor fixation (fixed end to probe insulation), horizontal instrument service entrance must be down, and the vertical line explosion-proof pipe installation must't bottom line port of mouth, in case of explosion-proof pipe water endanger instrument electronic unit.

4, according to the requirements of explosion-proof instrument installation, wiring of each connected with explosion-proof enclosure must be equipped with a certified seal of stuffing box or explosion-proof steel tube seal joint.

5, certification of seal stuffing box or explosion-proof pipe seal joint product please consult our company and the agent.Instrument installation area requires the lightning protection device, in case of a lightning strike.

6, 24 VDC power supply ripple shall not be greater than 200 mv.

7, power supply ground wire to meet the standard or standard instrument, do not pick up on the floor in power.

Seven, notable matters of installation:

1, the installation location not being too close to the mouth, otherwise, when the material easy to receive fake echo.

3, for the original coal cylindrical, shall be installed in the cylinder radius in half, the sensor should be aimed at discharging port.

3, connection

Level switches required for different voltage grade are different according to the model, in order to ensure the personal safety and equipment in good condition, should be in the case of power wiring.

Connection mode is divided into two wire system and four wire system,

We collected is 4-20 ma current signal, to prevent electromagnetic interference on site, ensure the accuracy of signal, should use shielded cable, shielding grounding cable end.

Eight,Selection of code:

Nine, sensor selection table:

Note: 1, PTFE teflon;More than 2, as the standard length, according to the users can switch the length of the production.

Ten, design selection and ordering information:

1, liquid level control device specifications;

2, measurement range;

3, working pressure, and temperature;

4, control device for material;

5, special requirements;

6, whether level device matching supply vessel flange, bolts, nuts, valves and fittings such as sealing washer, so that the correct selection.

After-sales service commitment:

1, my company the liquid level switch series of products are sold within 12 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.