Hf radar level gauge
Hf radar liquidometer antennas and microwave narrow pulse, the pulse in the space at the speed of li…
Description：
Products overview:
ZWRD900 seriesHf radar level gaugeBy microwave pulse measurement method, and can be within the scope of industrial frequency band is normal, low beam energy, can be installed on a variety of metals, non-metallic, container or the pipe for liquid, paste, and granular material level for non-contact continuous measurement.Applicable to the dust, change of temperature, pressure, and presence of inert gas and steam.Radar liquid level gauge and environment are no harm to human body, but also has not influenced by the proportion of medium, not affected by dielectric constant change, do not need to live the advantages of school adjustment, both for industrial needs, or the consideration of economic material benefit to customers, is a good choice.
Second, the working principle:
ZWRD900 series high frequency radar liquid level gauge by transmitting and receiving antenna system, radar wave 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 the condition is more complex cases, false echo, with zui new microprocessor technology and debug software can accurately identify 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:
ZWRD900 series high frequency radar level gauge is suitable for liquid, paste, and granular material a non-contact continuous measurement, and the change of temperature, pressure, and presence of inert gas and volatile situations.Using microwave pulse measurement method, and can be within the scope of industrial frequency band to work normally.Beam energy is low, can be installed in all kinds of metal, non-metallic vessel or pipe, no damage to the human body and the environment.
Four, the main features:
1, the beam Angle is small, the energy concentration, for radar installation location has more flexibility.Have stronger anti-interference ability, greatly improve the measurement precision and stability.
2, small antenna size, convenient for radar installation, at the same time for small tanks and tanks special measurement has a better adaptability.
3, the measuring blind area small, big z limit increases the radar measurement range.
4, shorter wavelength for powder, granular materials such as measure effect is better.
5, launch the pulse signal, transmission power radar level meter is extremely low, can be installed in all kinds of metal and nonmetal container, no harm to human body and environment.
Five, the technical parameters:
1, application: solid storage containers, containers or strong dust easily crystallized, condensation occasions;
2, measuring range: 70 m;
3, measuring accuracy: + / - 15 mm;
4: (- 40 ~ 80 ℃), process temperature (40 ~ 130 ℃ (60 ~ 250 ℃) (60 ~ 400 ℃).
5, frequency: 26 GHZ;
6, the signal output (4 ~ 20 ma), HART, Modbus;
Two wire system, power supply, 24 v, 24 v / 220 v; four wire
8, field showed that the standard;
9, shell, selection;
10, process connection: thread/flange;
11, antenna: the horn (316 l stainless steel).
Six, can debug through three ways:
1, by displaying the adjustment module PM;
2, through debugging software SOFT;
3, handheld programmer by HART.
Seven, through SOFT software debugging:
Regardless of 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.
Eight, 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.
Nine, measurement considerations:
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.
Ten, use notice:
1, the meter used in outdoor, zui good awning installation 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, parameter table:
Table 1:
Product category | ZWRD901 | ZWRD902 | ZWRD903 |
Product pictures |  |  |  |
Range of application | Simple process conditions, corrosion resistance Liquid, sewage, etc | To adapt to all kinds of storage container, liquid Body, the paste | To adapt to all kinds of storage container, liquid Dust, paste, block material, solid |
measuring The amount van wai | 20m | 30m | 70m |
pass cheng evenPick up | Thread, flange | Thread, flange | Thread, flange |
pass cheng wenThe degree of | - 40-120℃ | - 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 | 26GHz | 26GHz | 26GHz |
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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