Explosion-proof type radar liquid level gauge

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Explosion-proof type of radar level gauge low extremely short microwave pulse energy is emitted by t…

Products overview:

ZWRD803 seriesExplosion-proof type radar liquid level gaugeAdopts world advanced large scale integrated circuit, the use of radar principle, digital signal processing technology and fast Fourier transform (FFT) technique.Can adopt continuous dynamic measurement, the measurement of liquid and solid material level (block, powder), has a far distance (35 meters), high precision, etc.With the capacitor, heavy hammer contact instrument, such as has the incomparable superiority.Has a low maintenance, high performance, high precision, high reliability, long life and other advantages.With the capacitor, heavy hammer contact instrument, such as has the incomparable superiority.

Second, the working principle:

ZWRD803 series explosion-proof type 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:

ZWRD803 series explosion-proof type 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 substitute products;

3, shall be subjected to pressure, vacuum, temperature changes, inert gas, dust, steam and other environmental impact;

4, installation is simple, durable, free maintenance;

5, the output signal is 4 ma ~ 20 ma/HART protocol, calibration is simple, through digital LCD easy calibration operation, by setting up and programming software to realize simple configuration;

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 350 ℃.

Five, 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).

Six, 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.

Seven, 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.

Eight, 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, measurement 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.

Nine, use notice:

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, parameter table:

Product category	ZWRD801	ZWRD802	ZWRD803
Product pictures
Range of application	Simple process conditions, corrosive liquid, paste, solid  Such as:  The water tank Acid and alkali storage tank  Slurry storage tank  Solid particles Small storage tanks	Storage container or process corrosive liquid, paste, solid  Such as:  The water tank Acid and alkali storage tank  Slurry storage tank  Solid particles Small storage tanks	To adapt to all kinds of storage container, liquid, paste, solid  Such as:  Crude oil, light oil tank Raw coal, pulverized coal positions Volatile liquid storage tanks Coke material level  Slurry storage tank  Solid particles
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）

Twelve, selection of coding: