Radar level gauge, radar liquid level gauge, and radar level gauge introduction:

Features and advantages:
No blind spots, high precision
Two wire or four wire technology is an excellent alternative to differential pressure instruments, magnetostrictive instruments, radio frequency admittance instruments, and magnetic flap instruments.
Not affected by pressure changes, vacuum, temperature changes, inert gases, smoke, steam and other environmental factors
Easy to install, sturdy and durable, maintenance free
HART or PROFIBUS-PA communication protocol and Foundation fieldbus protocol, easy to calibrate and achieve on-site calibration operation through digital LCD display. Simple configuration settings and programming are achieved through software GDPF
Sensitive measurement and fast refresh rate.
Suitable for high temperature conditions, with a process temperature of up to 200 ℃. When using a high-temperature extension antenna, it can reach up to 350 ℃
measuring principle
The radar level gauge antenna emits microwave pulses, which reflect off the surface of the measured material and are received by the radar system.

input
The antenna receives the reflected microwave pulse and transmits it to the electronic circuit. The microprocessor processes this signal and identifies the echo generated by the microwave pulse on the surface of the material. The correct recognition of echo signals is completed by intelligent software, with an accuracy of up to millimeter level. The distance D from the surface of the material is proportional to the time travel T of the pulse:
D=C×T/2
Where C is the speed of light
Since the distance E of the empty tank is known, the level L is:
L=E-D
output
By inputting the empty tank height E (=zero), full tank height F (=full range), and some application parameters to set, the application parameters will automatically adapt the instrument to the measurement environment. Corresponding to 4-20mA output.
Measuring blind spots
Blind spot (BD) is the minimum distance from the measurement reference point to the highest object level on the surface of the medium.
Measurement conditions
precautions
The measurement range starts from the point where the beam touches the lower part of the tank, but in special cases, if the tank is concave or conical, measurement cannot be carried out when the level is below this point.
If the medium has a low dielectric constant and is visible at a low liquid level, it is recommended to set the zero point at a low height of C to ensure measurement accuracy.
In theory, it is possible to measure the position reaching the tip of the antenna, but considering the effects of corrosion and adhesion, the final value of the measurement range should be at least 50mm away from the tip of the antenna.
For overflow protection, a safe distance can be defined to be added to the blind spot.
The minimum measurement range is related to the antenna.
With different concentrations, foam can both absorb microwave and reflect it, but it can be measured under certain conditions.
Actions beyond the measurement range
When the measurement range exceeds, the instrument outputs a current of 22mA.
Electrical connection
two-wire
Minimum load for HART communication: 250 Ω
Cable entrance: M20 × 1.5
Equipped with polarity reversal, RF interference, and peak overvoltage protection circuits.
debugging
GDPULS can be debugged in three ways:
By displaying the adjustment module GPM
Debugging software GDPFSOFT
On site programming module (GPM) via HART handheld programmer
The GPM programmer consists of 6 buttons and a LCD screen, which can display adjustment menus and parameter settings. Its function is equivalent to an analytical processing instrument.
Debugging through GDPF software
Regardless of the signal output, 4... 20mA/HART, Profibus PA, Radar sensors can be debugged through software. Using GDPF software for debugging, GDPULS requires an instrument CONNECTCAT driver. The software and CONNECTCAT driver can be ordered as accessories.

When debugging software, power up the radar instrument with 24VDC and add a 250 ohm resistor to the front end of the HART adapter. If the power supply instrument is equipped with an integrated HART resistor (internal resistance of 250 ohms), no external resistor is required, and the HART adapter can be connected in parallel with the 4... 20mA line.