Radar level gauge
Radar level gauge has a low maintenance, high performance, high precision, high reliability, long li…
Description：
Products overview:
ZWRD800 seriesRadar level gaugeIs very low will launch energy extremely 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.A special type of time extension method can guarantee the stability of a very short period of time and accurate measurement.Material level meter even in the working condition is more complex, the presence of false echo, with its new zui micro processing technology and debug software can accurately analyze the level of the echo.The product is suitable for high temperature and high pressure, high vacuum, steam, dust and bad environment such as volatile gas.For continuous measurement of different materials.
Second, the working principle:
ZWRD800 series of 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.
The input
Antenna receiving the reflected microwave pulse and sending them to the electronic circuit, microprocessor to signal processing, identify the micro pulse produced by the echo in the material surface.Correct echo signal recognition completed by intelligence software, precision can reach millimeter level.Distance on the surface of the material distance D is proportional to the pulse travel time T:
D=C×T/2
Where C is the speed of light
E known due to empty cans of distance, the level of L as follows:
L=E-D
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 4-20 ma output.
Applications:
ZWRD800 series of 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 application of medium:
Electricity plant, coal, raw coal, fuel storage, reservoir, exhaust gas purification tank, pump, ash library, tank, etc.;
Oil fields: crude oil or refined petroleum products storage tanks, three-phase separator, sedimentation tank, sewage tank, oil-water interface and drilling mud tank, etc.
Work: the crude distillation tower, raw material and intermediate bunker tank, reaction tank, ammonia, solid bin, separator, etc.;
Kim: smelting ore bin, ore mill, raw material warehouse, accessories warehouse, blast furnace, alumina powder storehouse, electrolytic cell buffer tank, etc.;
The water mud, stone warehouse, pulverized coal bunker, cement warehouse, warehouse, slag storage warehouse, etc.;
Water treatment: reservoirs, sewage pool, cans, sedimentation tank, deep well water treatment, drinking water network, etc.;
Made of paper: raw materials warehouse, towers, drum drying, chemical storage materials storage warehouse, etc.;
He: its quarry, food, pharmaceutical, environmental protection, shipbuilding and other industries.
Five, 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 ℃.
Six, the technical parameters:
1, the working frequency: 6.8 GHz;
2, measuring range: cable type: 0-35 m pole type, coaxial type: 0-6 m;
3, repeatability, plus or minus 3 mm;
4, resolution: 1 mm;
5, sample: echo sampling/s 54 times;
6, the response speed: > 0.2 S (according to the specific use of the case may be);
7, precision: < 0.1%;
8, the output current signal: 4-20 ma;
9, communication interface: HART communication protocol;
10, process connection: G1-1/2, G3/4 flange: (, DN80, DN100, 6;
11, the process pressure: 1 ~ 60 bar;
12, power: 24 VDC ripple voltage (+ / - 10%) : 1 VPP;
13, power consumption: max22.5 mA;
14, environmental conditions: temperature: - 40 ℃ ~ + 250 ℃;
15, shell protection grade: IP68;
16, explosion-proof level: EXiaIICT6;
17, two wire connection: instrument power supply and signal output sharing two core cable;
18, cable entry: M20 x 1.5 (cable diameter 5 ~ 9 mm).
Seven, 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 zui to 6 meters long for tank measuring distance of more than 6 m, 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.
Eight, the debugging method:
A, can through debugging in three ways:
1, by displaying the adjustment module PM;
2, through debugging software SOFT;
3, handheld programmer by HART.
B, through SOFT software debugging:
No matter the signal output, 4-20 ma/HART, radar sensors can be 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.
Nine, 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 of the measured medium is very high, is the temperature inside the radar head could exceed 65 ℃.At this time, can use a small amount of wind, by the phi 6 x1 copper tube rain hat head blow in radar, to internal temperature down, never to do mechanical cooling water or other liquid.
4, volatile organic compounds in crystallization or antenna, radar level gauge trumpet to timely inspection and cleaning.
Ten, use requirements:
1, the meter used in outdoor, install the awning or protect box, lest time grew, LCD aging by sunlight.If used in the corrosive gas environment, need to install anti-corrosion coat, and outer casing and tighten the instrument into the outlet terminals.Where corrosive gas or liquid is used, or at the beach, sea use, need to choose anti-corrosion type.
2, wire, cable protection tube, pay attention to the seal to prevent water, to prevent rodent bite by rats, etc.
3, instrument, although itself with lightning protection device, instrument when used in dore region, Suggestions on the instrument into the outlet end of the other special installation of lightning protection devices.
4, instrument used in special hot and cold place, namely the ambient temperature may exceed the instrument work requirements, proposed around the liquid level meter high resistance, low temperature device.
5, radar and measured the level of vertical, the launch of the cone in radar electromagnetic wave must be within the scope of other obstacles.
6, if the < - 20 ℃ or > + 60 ℃ temperature for use, please in advance the company's technical service department.
7, using the environment with dust, vapor, mist, liquid level bubble, floats, liquid mixing, waves, and so on and so forth, please our company in advance technical service department, need to discriminate.
Eleven, matters needing attention:
1, the meter used in outdoor, install the awning or protect box, lest time grew, LCD aging by sunlight.If used in the corrosive gas environment, need to install anti-corrosion coat, and outer casing and tighten the instrument into the outlet terminals.Where corrosive gas or liquid is used, or at the beach, sea use, need to choose anti-corrosion type.
2, wire, cable protection tube, pay attention to the seal to prevent water, to prevent rodent bite by rats, etc.
3, instrument, although itself with lightning protection device, instrument when used in dore region, Suggestions on the instrument into the outlet end of the other special installation of lightning protection devices.
4, instrument used in special hot and cold place, namely the ambient temperature may exceed the instrument work requirements, proposed around the liquid level meter high resistance, low temperature device.
5, radar and measured the level of vertical, the launch of the cone in radar electromagnetic wave must be within the scope of other obstacles.
6, if the < - 20 ℃ or > + 60 ℃ temperature for use, please in advance the company's technical service department.
7, using the environment with dust, vapor, mist, liquid level bubble, floats, liquid mixing, waves, and so on and so forth, please our company in advance technical service department, need to discriminate.
Twelve, environmental impact factors are:
1, the influence of the obstacles.
If the launch of the electromagnetic wave instrument comes into contact with the barrier, then you'll get a jamming waveform.If you can't choose other ideal installation location, choose the small beam Angle instrument or using guided wave tube and by-pass pipe installations can be solve the problem.
2, the influence of the transmission medium
(1) the temperature;
(2) pressure;
(3) the transmission medium corrosion resistance;
(4) whether the transmission medium contains steam or dust, etc.;
(5) the volatiles in the environment with crystallization or dust adhesion problems.
To solve the above problem, then we will guarantee, electromagnetic waves or ultrasonic arrived in material surface under test, no big attenuation.Measured on the surface of the material through reflection, get a echo signal.The strength of the echo signal and the measured material surface under state.
1, the dielectric constant of the measured substance or hardness.
The strength of the dielectric constant influence the electromagnetic wave reflection.The echo of the dielectric constant, the greater the stronger.While the hardness is reflection of sound waves.The greater the hardness, the stronger the sound wave reflection.
2, on the surface of the material being tested pile Angle;
3, on the surface of the material being tested stability;
4, particle degree of the measured object and loose;
The analyte 5, moist degree.
13, parameter table:
Table 1:
Product category | ZWRD801 | ZWRD802 | ZWRD803 |
Product pictures |  |  |  |
Range of application | Simple process conditions, corrosive liquid, paste, solid | Storage container or process corrosive liquid, paste, solid | To adapt to all kinds of storage container, liquid, paste, solid |
measuring The amount van wai | 20m | 20m | 30m |
pass cheng evenPick up | G11/2or11/2NPTThe screw thread | The flange | The flange |
pass cheng wenThe degree of | - 40-130℃ | - 40-150℃ | - 40-250℃ |
pass chengpressure force | -1.0-3bar | -1.0-20bar | -1.0-40bar |
heavy after sex | ± 3mm | ± 3mm | ± 3mm |
fine The degree of | < 0.1% | < 0.1% | < 0.1% |
frequency The rate of van wai | 6.8GHz | 6.8GHz | 6.8GHz |
explosion-proof/Protection grade | EXiaIICT6/IP68 | EXiaIICT6/IP68 | EXiaIICT6/IP68 |
The letter No.Lose, Out of the | 4…20mA/HART（The two lines） | 4…20mA/HARTTwo lines) | 4…20mA/HART（The two lines） |
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