One-piece ultrasonic level meter

Products overview:

ZWS - 200 kl seriesIs controlled by microprocessor digital level instrument.In the measurement of pulse ultrasonic made by sensor (transducer), the sound waves reflected an object's surface by the same sensor after receiving, converted to electrical signals.And by sound waves between transmitting and receiving time to calculate the sensor to the distance of the object to be tested.Due to adopting noncontact measurement, almost unlimited measured medium, can be widely used in all kinds of liquid and solid material height measurement.

Second, the working principle:

ZWS series - 200 kl one-piece working principle of ultrasonic liquid level meter is made by ultrasonic transducer (probe) high frequency pulse waves meet level (materials) on the surface to be tested is reflected back to the echo are converted to electrical signals received by transducer. Acoustic travel time and sound waves to object is directly proportional to the distance from the surface. And sound transmission distance S available formula for the relation of the sound velocity and acoustic transmission time T C said: S = C * T / 2. Emit ultrasonic probe part, and then by liquid surface reflection, probe part again receive, probe into the liquid on the surface of the (content) is proportional to the distance and ultrasonic through time:

Hb = ct2 namely

Distance [m] = time / 2 x sound [m]

The temperature of the sound velocity compensation formula:

Sound velocity = 331.5 + 0.6 x temperature environment

Applications:

ZWS - 200 kl series of one-piece ultrasonic level meter used in petroleum chemical industry, metallurgy, electric power, pharmaceutical, water supply and drainage, environmental protection system and industry such as all kinds of medium level measurement.Exquisite structure, simple adjustment and flexible installation convenience is provided for the user to easily use.4 ~ 20 ma, 0 ~ 5 v, 0 ~ 10 ma and standard signal output by the user choose according to need.

1, water and sewage treatment, pump room, collecting well, biochemical reaction tank, tank, etc.;

2, electric power, mining, mortar, coal slurry pool, pool water treatment, etc.

Four, the main features:

1, is featured by strong anti-interference.Nodes can be arbitrary set upper and lower limits for the output and online, with the scene, according to the optional analog and switch quantity output and RS485, convenient interface and related facilities.

2, using polypropylene waterproof shell.Shell is small and very strong, it has excellent chemical resistance, for inorganic compounds, regardless of acid, alkali, salt solution, in addition to the strong oxidizing materials, almost all of its no damage, for almost all the solvent at room temperature are insoluble, general alkanes, hydrocarbons, alcohol, phenol, aldehyde, ketone, etc all can use.

3, light weight, no scaling, no pollution medium.

4, non-toxic.Can be used in the food industry equipment installation, maintenance is very convenient.

Five, the site conditions:

1, the ambient temperature: - 10 ~ + 60 ℃ (low temperature situation need special instructions);

2, watchcase protection grade: IP65 is suitable for outdoor installation;

3, suitable measurement medium: applicable to most of the liquid and powder granular solid, weak acid, weak alkali, alkali, acid less than 40%.If in strong acid applications, please contact with our company, you should use anti-corrosion probe;

4, container pressure: 0.7 ~ 3 bar.

5, in the following any kind of situation, should pay attention to:

(1) has a bubble liquid, solid;

(2) surrounded by strong voltage, strong current, strong electromagnetic interference, try to avoid high voltage, high current and strong electromagnetic interference;

(3) the wind and the sun to be basked in straight;

(4) strong vibrations.

Six, the technical parameters:

1, working voltage: DC12V / 300 ma, + 10% (the default), optional DC24V;

2, detection range: 1,2,3,5,6,8,10,15,20,30,50;

3, display resolution: d = 1 mm / 1 cm calibration Settings;

Section 4, show: four eight of 0.39 inch LED digital tube or LCD display more information;

5, limit value: 2-4 set of limit TTL level control or NPN open collector output, can be directly driven solid state relay;

6, data output: basic 4 ~ 20 ma analog output, the choose and buy is 0 ~ 5 v, 1 ~ 5 v or serial data output;

7, key plate: three waterproof light touch key, can be set on the floor, TTL level control output mode (choose);

8, working frequency: 20 ~ 300 KHZ (because of type and different);

9, working temperature: 0 ~ 50 ℃, - 10 ~ 60 ℃, and 30 ~ 80 ℃ is optional;Storage temperature: - 40 ℃ ~ 85 ℃;

10, detection methods: continuous 1 ~ 100 hz (due to the range and condition is different, the default 1 hz);

11, appearance size: 120 * 120 * 180 (because of type and different), 4-20 ma analog output.

Seven, container installation conditions:

1, airtight container:

A, to 8 m below range, vessel to have more than DN65 flange, length without requirement of the flange to take over.

B, to 10 m, 12 m range, vessel to have more than DN80 flange, the flange of the over length is less than 150 mm.

C, to 15 m range, vessel to have more than 6 flange, the flange of the over length is less than 150 mm.

D, to 20 m, 30 m and 40 m range, vessel to have more than DN200 flange, the flange of the over length is less than 200 mm.

2, open container:

A, to 8 m below the range, the container should have a diameter of 65 mm above the installation.

B, to 10 m, 12 m range, the container should have a diameter of 80 mm or more installation, installation of mouth thickness is less than 150 mm.

C, to 15 m range, the container should have a diameter of 150 mm above the installation, installation of mouth thickness is less than 150 mm.

D, to 20 m, 30 m and 40 m range, the container should have a diameter of 200 mm above the installation, the installation mouth thickness is less than 200 mm.

3, open the pool: requires mounting bracket.

Eight, the choice of the form of connection:

1, two wire system: two wire ultrasonic level meter its power supply (DC24V only) and the signal output (D - 20 ma) share a loop, using only two lines, as the standard form of transmitter.

2, three-wire system: three wire ultrasonic level meter, in fact, as the four wire system, its power supply (DC24V only) and the signal output (D - 20 ma) circuit separation, the use of two lines, when they were connected to negative side, usually use three lines.Its advantage is transmitted power is larger.

Three and four wire system: power supply (DC24V or AC220V) and signal output loop separation (D - 20 ma), use two lines, its advantage is transmitted power is larger, at the same time provides the high and low relay output, increased the new function.

4, measuring range:

A, according to the actual range to choose corresponding model of ultrasonic level meter.

B, if measured volatile liquid, please select a large range level model.

C, solid of effective range of the measurement of liquid level range of 1/2 to 2/3.

5, power supply form:

DC24V power supply:

A, give two wire series power supply current capacity shall be not less than 30 ma.

B, to provide three wire series power supply current capacity should not be less than 60 ma.

C, offers four wire series power supply current capacity shall be not less than 80 ma.

AC220V power supply:

Can only choose four wire series products, power supply current capacity shall be not less than 50 ma.

Nine, installation considerations:

When installation, pay attention to the following:

1, the distance between the sensor and the high level should be greater than blind area (ullage is equal to the high level + blind area) at the same time to ensure that the sensor axis should be perpendicular to the surface to be tested.

2, blind area and a small distance sensor to measure liquid, instrument can not work normally, within the range of the average value (range < 20 m) between 30 cm to 60 cm, (20 m) range > set between 60-100 cm.

3, in the midst of a fixed can add rubber gasket when necessary, at the same time, far from noise sources as possible.

4, because of the existence of firing Angle sensor in the sensor and the wall when installation should keep a certain distance.Measurement of solid material level sensor should avoid the feed opening.

5, don't be easy to cause disturbance signal in the measurement range of obstacles, such as a ladder, beams, access channels, etc.

6, the measurement of solid materials, if necessary, can use phase conversion connector, through it to adjust the Angle measurement of sensor, the sensor z to receive the echo signal, and find the ideal points, realize the accurate measurement of material level.

Ten, parameter table:

Eleven, selection of coding:

Note: if measured volatile liquid, please choose a big level model, solid level of effective range of the measurement is 1/2 to 2/3.