High voltage guided wave radar level meter

Productoverview:

ZWRD706 series There are a variety of forms and a variety of installation method, suitable for almost all liquid (circles) surface measurement, but also can be applied to the measurement of dust, sand, flour and granular material, can completely replace the buoy, such as the use of magnetic liquid; it has many advantages, such as the measurement process, which is not affected by the change of medium density and the temperature and pressure measurement accuracy; and has simple installation and debugging methods, only need to input the configuration data can be used, it is a kind of advanced level instrument.

Two, work principle:

ZWRD706 series high voltage guided wave radar level meter is based on the principle of the travel time measuring instrument, low emission energy short microwave pulse by transmitting and receiving antenna system.The radar waves travel at the speed of light. The running time can be converted into a signal by electronic components.A probe and high-frequency pulse along the cable or rod probe conduction, when the pulse encounters material surface reflected back by the receiver within the meter receiving, and the distance signal into the signal level. A special time extension method can ensure the measurement in short time, stable and accurate. Even if the condition is complex, the existence of false echo, using new micro processing technology and debugging software can accurately analyze the echo level.

1, input:

Pulse signal reflection along the cable or rod type probe instrument conduction to the electronic circuit, the microprocessor in signal processing, identify the microwave pulses generated in the material surface echo. The echo signal is completed by intelligent recognition software, from the material surface distance between D and T is proportional to the pulse travel time: D=C * T/2 where C is the speed of light due to known distance E cans, the object L is: L=E-D;

2, output:

By entering the empty tank height E (= zero), full height (F = full-scale) and some applications to set parameters, the instrument will automatically adapt to the application of parameter measurement environment. Corresponding to the 4... The output of 20mA;

3, measuring range:

The measurement range of F-; E- empty distance; B- top blind; small blind H- probe to distance from the top of tank wall is a small distance between the material surface and high measurement reference point. The bottom area refers to the cable near the bottom of a long distance can not be measured accurately. Between the top and bottom blind blind is effective in measuring the distance;

Note: only 4, between the top and bottom of the material in the blind blind area, in order to ensure the reliable measurement of tank level.

Three, application:

ZWRD706 series high voltage guided wave radar level meter is suitable for high temperature (350 DEG C), high pressure, vacuum, steam, high dust and volatile gases and other harsh environment. Continuous measurement of different material. The main technical index of the instrument to or better than the similar products at home and abroad, and convenient installation and debugging, you can use a single, can also use the network, can be widely used in metallurgy, building materials, energy, petrochemical, water, food and other industries.

Four, main features:

1, no blind spots, high precision.

2, two wire technology, is an excellent alternative products, a differential pressure meter of magnetostriction, RF admittance, magnetic instrument.

3, without pressure, temperature, vacuum, inert gas, dust, steam and other environmental impact.

4, easy to install, durable, maintenance free.

5, HART or PROFIBUS-PA communication protocol and foundation fieldbus protocol, the calibration is simple, easy to realize liquid crystal display through the digital calibration operation is implemented through software programming and simple configuration of GDPF.

6, sensitive measurement, fast refresh.

7, suitable for high temperature, high temperature of 200 DEG C, when using high temperature to extend the antenna can reach 300 deg..

Five, technical parameters:

1 range: Cable: 30m/ rod: 6m;

2, wire / rod diameter: Phi 6mm/ phi 10mm;

3, the process of temperature: -200 to 400 DEG c;

4, the process of vacuum pressure: 400bar;

5, working frequency: 100MHz-1.8GHz;

6, repeat: + 3mm;

7, resolution: 1mm;

8, sampling: echo sampling 54 /s;

0.2S（根据具体使用情况而定）；">9, the response speed of >0.2S (according to the specific circumstances);

10, accuracy: <0.1%;

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

12, communication interface: HART communication protocol;

13, process connection: G1-1/2, DN50, DN80, G3/4 flange: DN100, DN150;

14, power: 24VDC (+ 10%)

15, ripple voltage: 1Vpp;

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

Six, through the three ways of debugging:

1, through the display adjustment module PM;

2, through debugging software SOFT;

3, through the HART handheld programmer.

Seven, through the SOFT software debugging:

No matter what kind of signal output, 4-20mA/HART, radar sensors can be adjusted through the software. Instrument debugging using SOFT software, the need for a CONNECTCAT instrument driver.

When using the software debugging, to the radar instrument plus electric 24VDC, while the resistor connected HART adapter is add a 250 ohm. If one HART resistor (250 ohm internal resistance) power supply instrument, do not need additional external resistor, HART adapter and 4... 20mA parallel line.

Eighth, installation guide:

The installation guide for rod type and cable type probe, independent tube probe measurements and installation method.

Installation position:

The distance of 1, distance of tank wall for tank diameter 1/6 1/4 (at least 300mm, concrete tank at least 400mm);

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

3, do not install in the feeding opening;

4, choose the length of the probe, the probe from the bottom of the tank bottom note about more than 30mm;

5, pay attention to the medium temperature.

Tank obstacle:

1, pay attention to the distance of the probe obstacles at least 200mm.

Get rid of the interference:

1, interference echo suppression: software can realize the suppression of interference echo, so as to achieve the ideal effect measurement;

2, the bypass pipe and the wave guide tube (only for liquid viscosity) for play on the 500cst, can be used to bypass pipe, wave guide pipe or tube to avoid interference.

Liquid standard installation:

The viscosity of less than 500cst and not easy to produce adhesion medium, tube type probe is an ideal scheme, its features are as follows:

Superior reliability;

1, can be used in any medium dielectric constant greater than or equal to 1.4, and is independent of the medium conductivity measurement;

The obstacle and tube size 2, the tank does not affect the measurement;

The transverse pressure 3, stroke type probe can withstａnd high;

4, for the high viscosity of the medium, recommend the use of bar type probe.

Horizontal tank and vertical tank installation:

1, tube type probe and rod type probe Zui length to 6 meters for measuring distance more than 6 meters of the tank, can be used 8mm cable type probe;

2, installation and fixation with solid powder storage measurement;

3, the distance from tank wall without restrictions, as long as the probe to avoid contact tank wall;

4, if the tank obstacles more or too close to the probe, please use the tube type probe.

Nine, the daily check and maintenance:

1, daily maintenance is mainly to see whether the power supply voltage and the output current is normal. After the power is about 30~60min meter to work properly. If the instrument is put into operation after the output, it should check whether the power really connected, and check whether the fuse is burned out.

2, when used and equipment as a whole, the whole system of radar level meter is sealed, so the seal usually should also check all parts of the joint is good.

3, head of the internal radar using a temperature of 65. General usage will not exceed this temperature, but if the temperature of the measured medium is very high, the internal temperature may exceed the radar head 65 C. At this time, you can use a small amount of wind, the 6X1 diameter copper tube from rain cap into the radar head, to the internal temperature down, do not water or other liquid cooling machine.

4, easy to volatile organic compounds will crystallize in the radar level meter or horn antenna, to regular inspection and cleaning.

10, note:

1, the measurement range from a low beam to touch the pot start calculation, but in special circumstances, if the tank is low concave or conical, when the level below this point cannot measure.

2, if the medium to low dielectric constant when it is at a low level, low visible at the tank, in order to ensure the measuring precision, should be zero at low altitude is C.

3, the theory on measurement of the position of the tip of the antenna is possible, but considering the effect of corrosion and adhesion, the measuring range of the final value should be the point of the antenna distance of at least 100mm.

4, for overflow protection can define a safe distance and dead area.

Eleven, the use of requirements:

1, the installation location

The installation position of radar level meter is ideal from the tank wall radius of 1 / 2 to 1 / 3, far away from the inlet outlet. If not up to the installation position of the ideal selection of radar level meter when try to choose the installation location of loose requirement of radar.

2, media characteristics

The first is a solid, liquid, and medium dielectric constants (medium dielectric constant measurement radar measurement more better). Corrosive, viscosity.

3, the tank environment

A (good) tank obstacles at work environment);

B) (not a stirring heating coil and other obstacles when there is a crystallization of steam, etc.).

Twelve, data comparison table:

Thirteen, the selection of encoding: