Radar level gauge radar level gauge radar level gauge Description:
Features and Benefits:
No blind spots, precision
Two-wire or four-wire technology, differential pressure meter, magnetostrictive, RF Admittance, magnetic flap meter excellent alternative.
Affected by ambient pressure changes, vacuum, temperature, inert gases, smoke, steam and other
Installation is simple, durable, maintenance-free
HART or PROFIBUS-PA and Foundation Fieldbus communication protocol agreement, calibration is simple, through the digital LCD for easy field calibration operation, through software configuration GDPF simple setup and programming
Measurement sensitivity, refresh speed.
Suitable for high temperature conditions up to 200 ℃ process temperature up to 350 ℃ high temperature when using extended antenna
The measuring principle
Radar level meter antennas emit microwave pulses, the measured material surface reflection, and was received by the radar system.
Antenna receives the reflected microwave pulses and transmits it to the electronic circuit, microprocessor processes this signal, identify the microwave pulse echo generated in the material surface Correct echo signal recognition by the intelligent software to complete, the accuracy can be achieved . millimeter distance D and the pulse travel time distance T is proportional to the surface of the material:
D = C * T / 2
Where C is the speed of light
Because the empty distance E is known, the level L as follows:
L = E-D
By entering the empty height of E (= zero), full tank height F (= span) and some applications to set the parameters, application parameters so that the instrument will automatically adjust to the measurement environment. Correspond to 4-20mA output.
Blind (BD) is the minimum distance from the surface of the medium measurement reference point to the highest level when.
Measuring range from low beam to touch tank that point began to calculate, but in exceptional circumstances, if the tank as low as concave or tapered, when the level falls below this point can not be measured.
If the medium is a low dielectric constant when it is low level, the tank low visibility, this time in order to ensure accuracy, we recommend the zero set at a low height of C position.
Theoretically measuring tip reaches the antenna position is possible, but taking into account the impact of corrosion and adhesion, the final value of the measuring range should be from the tip of the antenna at least 50mm.
For overflow protection, define a safe distance attached to the blind spot.
Minimum measuring range and antenna related.
With different concentrations, the foam can either absorb microwaves, and can be reflected, but under certain conditions can be measured.
Measuring range exceeded action
When the measuring range is exceeded, the instrument output current is 22mA.
HART communication minimum load: 250Ω
Cable entry: M20 * 1.5
Equipped with reverse polarity, RFI, and peak overvoltage protection circuit.
GDPULS three ways debugging:
Through the display adjustment module GPM
By commissioning software GDPFSOFTWARE
By HART handheld programmer site field programming module (GPM)
GPM program consists of six buttons and an LCD screen that can display menus and adjust the parameter settings. Its function is equivalent to an analytical process instrumentation.
By GDPF software debugging
No matter the kind of signal output, 4.20mA / HART, Profibus PA, radar sensors can be carried out by software debugging software debugging using GDPF, GDPULS need an instrument CONNECTCAT drive software and CONNECTCAT drive can be ordered as an accessory.
Use the software debugging time, to the radar instrument is powered 24VDC, while the front end is connected HART adapter plus a 250 ohm resistor. If the integrated HART resistance (internal resistance of 250 ohms) power meter, you do not need additional external resistor, this time HART adapter can 4.20mA parallel lines.