GML801-B High frequency High signal-to-noise ratio Shorter wavelengths 4-20mA 26GHZ Radar Level Meter

Product Overview

GML801-B radar level gauge series sensor is a 26GHz high-frequency radar-type level measuring instrument with a maximum measurement distance of 80 meters. The antenna is further optimized and processed, and a new type of fast microprocessor can perform higher-speed signal analysis and processing, so that the instrument can be used for some complex measurement conditions such as reactors and solid silos.

Working Principle

Radar level antennas emit narrower microwave pulses that are transmitted downward through the antenna. After the microwave contacts the surface of the measured medium, it is reflected back and received again by the antenna system. The signal is transmitted to the electronic circuit and automatically converted to the level signal. The time taken is almost instantaneous).

Measurement datum: Thread bottom surface or flange sealing surface.
Note: When using radar level timing, be sure to ensure that the highest material level cannot enter the measurement blind zone (the area shown by D in the figure).

Product Features

●The antenna size is small for easy installation; non-contact radar, no wear and no pollution.
●Hardly affected by corrosion and foam; hardly affected by atmospheric water vapor, temperature and pressure changes.
●The severe dust environment has little effect on the operation of the high-frequency level gauge.
●Shorter wavelengths give better reflection on inclined solid surfaces.
●The beam angle is small and the energy is concentrated, which enhances the echo capability and helps avoid interference.
●The measurement blind area is smaller, and it can also achieve good results for small tank measurement.
●High signal-to-noise ratio for better performance even in fluctuations.
●High frequency is the best choice for measuring solid and low dielectric constant media.

Dimensions

Technical Parameter

Protection Level

Installation Requirements

The radar level gauge is installed at 1/4 or 1/6 of the diameter. Note: The minimum distance from the tank wall should be ≥200mm.
Figure one: ① reference plane, ② container center or axis of symmetry.
The top surface of the conical tank can be installed in the middle of the tank top to ensure that the bottom of the cone is measured, as shown in Figure 2.
When there is a material stack, the antenna should be vertically aligned with the material surface. If the material surface is uneven, you must use universal flange to adjust the angle of the horn so that the horn is aligned with the material surface as much as possible, as shown in Figure 3.
Takeover height requirements: the antenna must be at least 10mm into the tank, as shown in Figure 4.

Electrical Connections

Power Supply

(4 ~ 20) mA / HART (two-wire system):

The power supply and the output current signal share a two-core shielded cable. See technical data for specific supply voltage range. For intrinsically safe type, a safety barrier must be added between the power supply and the instrument.

(4 ~ 20) mA / HART (four-wire system):

Separate the power supply and the current signal, and use a two-core shielded wire for each. See technical data for specific supply voltage range.

RS485/Modbus:

Separate the power supply and the Modbus signal, and use one-two two-core shielded wires respectively. See technical data for specific supply voltage range.

Instrument Commissioning

There are three ways to debug the meter, as follows:
Method 1: display / button;
The instrument is debugged through 4 keys on the display screen. (Figure 6)
① LCD display, ② key.
Method two: On-machine debugging;
Connected to the upper computer via HART (see Figure 7)
① RS232 interface or USB interface; ② radar level gauge; ③ HART adapter; ④ 2502 resistance.
Method three: HART handheld programmer programming;
HART handheld programmer (see Figure 8)
① RS232 interface or USB interface; ② Radar level gauge; ③ 250Ωresistance

Application

Power plants: coal piles, raw coal bunkers, fuel bunkers, cisterns, exhaust gas purification tanks, bunker pumps, steam drums, ash depots, fuel tanks, etc .;
Oil field: crude oil storage tank, refined oil storage tank, three-phase separator, sedimentation tank, sewage tank, oil-water interface, drilling mud tank, etc .;
Chemical industry: crude oil distillation tower, raw material silo, intermediate silo, reaction tank, ammonia water tank, solid silo, separator, asphalt storage tank, etc .;
Metallurgy: blast furnace, ore silo, ore crusher, raw material silo, auxiliary silo, alumina powder silo, electrolytic tank buffer tank, etc .;
Water conservancy: canals, reservoirs, farmland irrigation, river water level monitoring, flash flood warning, urban waterlogging, etc .;
Cement: stone silo, raw silo, cement silo, pulverized coal silo, slag storage silo, commercial boiler, etc .;
Food: Juice factory, milk factory, raw sugar storage tank, tomato sauce storage tank, brewery storage tank, etc .;
Pharmaceutical: Chinese medicine storage tanks, separators, fermentation tanks, etc .;
Water treatment: reservoirs, sewage tanks, water treatment tanks, sedimentation tanks, deep wells, drinking water networks, etc .;
Papermaking: raw material warehouse, storage tower, drying drum, chemical material storage warehouse, etc .;
Others: quarry, coal mine, environmental protection, shipbuilding and other industries.