High temperature guided wave radar level gauge

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High temperature guided wave radar level gauge has a low maintenance, high performance, high precisi…

Products overview:

ZWRD704 seriesHigh temperature guided wave radar level gaugeLow transmission power extremely short of microwave by transmitting and receiving antenna system.Radar wave are running at the speed of light.Running time can be transformed into material level signal by electronic parts.A special type of time extension method can guarantee the stability of a very short period of time and accurate measurement.Even if there are false reflection, micro processing technology and software can accurately analyze level echo.By entering the container size, distance above the value can be converted into is proportional to the level of the signal.The instrument can short positions debugging.In the measurement of the solid application can use K - frequency high frequency sensors.

Second, the working principle:

ZWRD704 series high temperature guided wave radar level meter is the measuring instrument based on the principle of time travel, very low energy is emitted by a very short microwave pulse by transmitting and receiving antenna system.Radar wave are running at the speed of light.Running time can be transformed into material level signal by electronic parts.Probe a high-frequency pulse and probe the conduction along the cable type or rod type, when the pulse in the material surface reflected by the receiver inside the instrument, and the distance signal is transformed into material level signal.A special type of time extension method can guarantee the stability of a very short period of time and accurate measurement.Even if the condition is relatively complex, false echo, with a new micro processing technology and debug software can accurately analyze the level of the echo.

1, the input:

Reflection of the pulse signal along the cable type or bar type probe to the instrument electronic circuit part, microprocessor to signal processing, identify the microwave pulse produced by the echo in the material surface.Correct echo signal recognition by intelligent software to complete, distance material on the surface of the distance D is proportional to the pulse of time travel T: D = C * T / 2 where C is the speed of light because of the distance of the empty cans E known, the level of L: L = E - D;

2, the output:

By entering empty cans height E (= zero), full tank height F (= full scale) and some applications to set parameters, application parameters will be automatically adapt instrument to measure the environment.Corresponding to the four...20 ma output;

3, measuring range:

F - measurement range;E - empty cans distance;B - the top blind area;H - probe zui small distance to the tank wall at the top of the blind area refers to the material of high material surface and the small distance between measuring reference point.At the bottom of the blind area is located near the bottom of the cable can't accurate measurement of the distance.At the top of the blind area and at the bottom of the blind area is effective measuring distance between;

4, note: only the material between the top blind area and at the bottom of the blind area, to guarantee the reliable tank level measurement.

Applications:

ZWRD704 series of guided wave radar level gauge is suitable for high temperature (350 ℃), high pressure, high vacuum, steam, dust and bad environment such as volatile gas.For continuous measurement of different materials.The instrument main technical indicators meet or exceed similar products at home and abroad, and convenient installation and debugging, can use a single, also can use network, can be widely used in metallurgy, building materials, energy, petrochemical, water conservancy, food and other industries.

Four, the main features:

1, no blind area, high precision.

2, two wire system technology, it is the differential pressure instruments, magnetostriction, rf admittance, magnetic flap instrument of good alternatives.

3, is not subject to pressure, temperature changes, inert gas, vacuum, dust, steam and other environmental impacts.

4, installation is simple, durable and maintenance free.

5, HART and PROFIBUS - PA communication protocol and the foundation fieldbus, calibration is simple, through digital LCD easy calibration operation, through software GDPF simple configuration Settings and programming.

6, measurement sensitivity, fast refresh.

7, suitable for high temperature working condition, process temperature up to 200 ℃, when high temperature to extend the antenna is used up to 300 ℃.

Five, the technical parameters:

1, the range: line: 30 m/rod: 6 m;

2, wire/rod diameter: 6 mm / ￠￠10 mm;

3, process temperature: 200 ~ 400 ℃;

4, the process pressure: vacuum ~ 400 bar;

5, working frequency: 100 MHZ - 1.8 GHz;

6, repeatability, plus or minus 3 mm;

7, resolution: 1 mm;

8, sampling: echo sampling 54 times/s;

9, the response speed: > 0.2 S (according to the specific use of the case may be);

10, precision: < 0.1%;

11, the output current signal: 4-20 ma;

12, communication interface: HART communication protocol;

13, process connection: G1-1/2, G3/4 flange: (, DN80, DN100, 6;

14, power: 24 VDC (+ / - 10%)

15, ripple voltage: 1 VPP;

16, shell protection grade: IP68;Level of explosion-proof: EXiaIICT6.

Six, installation guide:

The following installation instructions applicable to bar type probe and cable type, tubular type probe measurement has nothing to do with the installation.

1, the installation location:

A, distance of tank wall advice 1/6 - a quarter of the tank diameter (at least 300 mm, concrete tank at least 400 mm).

B, do not install in the middle of the metal cans;

C, don't put in the mouth;

D, when choosing the length of the probe, pay attention to the bottom of the probe from the tank bottom is about more than 30 mm;Pay attention to the medium temperature.

2, tank obstacles:

Pay attention to when installation probe at least 200 mm away from the obstacle.

3, remove interference:

, clutter echo suppression: a software which can realize the interference echo suppression, so as to achieve the ideal measurement effect;

B, the by-pass pipe and guided wave tube (only applicable to liquid) for viscosity don't play in the 500 CST, can adopt by-pass pipe, guided wave tube or pipe to avoid interference.

4, liquid standard installation:

For 500 CST or less and not easy to produce the adhesive medium viscosity, tubular probe is an ideal scheme, its characteristics are as follows:

A,, excellent reliability.

B, can be used in any medium, dielectric constant is greater than or equal to 1.4 measurement has nothing to do with the conductivity of medium;

C, tank obstacles and short tube size does not affect the measurement;

D, than bar type probe can withstand the lateral pressure is high;

E, for the high viscosity of the medium, it is recommended to use lever probe.

5, lie the tank and the installation of vertical tank:

A, tube type probe and bar type probe can be more than 6 meters to 6 meters for measuring distance of tank, can choose 8 mm cable type probe;

B, installed and fixed mode with solid powder storehouse measurement;

C, to the distance away from the tank wall unlimited, as long as avoiding probe contact tank wall;

D, if the tank obstacles more or too close to the ground rod, please choose tube type probe.

6, corrosive medium measurement:

If the corrosive medium, can choose lever probe measure set of a plastic casing.

Seven, measurement requirements:

1, measurement range from the beam hitting a can of low starting point, but under special circumstances, if the tank is low for concave type or conical, when the level below this point cannot be measured.

2, if the medium to low dielectric constant when it is in low level, low visibility, at this time in order to ensure the accuracy of measurement, the recommendations will be zero at low altitude to the position of the C.

3, theory, measurement to achieve the position of the antenna tip is possible, but considering the corrosion and the influence of the adhesive, the final value of measuring range should be at least 100 mm distance from the tip of the antenna.

4, the overflow protection, additional on the blind spot can define a safe distance.

5, zui small measuring range related to the antenna.

6, with different concentration, foam can absorb microwaves, and it can be reflected, but under certain conditions can be measured.

7, measurement is beyond the scope of action when the measuring range beyond, instrument of 22 ma current output.

Eight, can debug through three ways:

1, by displaying the adjustment module PM;

2, through debugging software SOFT;

3, handheld programmer by HART.

Nine, through SOFT software debugging:

No matter the signal output, 4...20 ma/HART, radar sensor can through the software debugging.Is instrument with the SOFT software debugging, need a meter CONNECTCAT drives.

Using software debugging, for the radar instrument 24 VDC power up, at the same time connect HART adapter front end with a resistance of 250 ohms.If the one-piece HART resistance (250 ohm internal resistance) of electricity meter, there is no need for additional external resistance, HART adapter can and 4...20 ma line in parallel.

Ten, daily check the maintenance:

1, daily inspection maintenance mainly to check the power supply voltage and output current is normal.About 30 ~ 60 min after electrify, instrument can work normally.If there is no output parameter meter, should check whether the power supply is connected to real, and check whether the fuse is burnt.

2, when using is become an organic whole repeatedly and equipment, the whole system radar level meter is sealed, so at ordinary times should also check the sealing condition of joints of different parts are in good condition.

3, radar, head of the use of the internal temperature of 65 ℃.General use cases not more than the temperature, but if the temperature