3. The Installation Requirements
There should be no obstacles between the bottom of the antenna and the surface of the measured medium, and the installation in the tank should be avoided as much as possible, such as: human ladders, limit switches, heating equipment, brackets, etc. Also note that the microwave beam must not intersect the material flow.
When installing, pay attention to the maximum liquid level not to enter the blind area of the measurement; the instrument must be kept a certain distance from the tank wall; the installation of the instrument should make the antenna emission direction perpendicular to the surface of the measured medium as much as possible.
Instruments installed in explosion-proof areas must comply with the national installation regulations for explosion-proof hazardous areas. Explosion-proof instruments can be installed in places with explosion-proof requirements, and the instruments must be connected to the ground. The shell of the explosion-proof instrument is made of cast aluminum.
Note: The minimum distance from the tank wall should be 200mm.
① datum ②The container center or axis of symmetry
Ø Conical tank
The instrument cannot be installed above the inlet.
Note: Sun-shading and rain-proof measures should be taken during outdoor installation..
①Correct ②Error rainproof measures
Ø The meter cannot be installed in the middle of the top of an arched or round tank. In addition to producing indirect echoes, it will also be affected by multiple echoes. Multiple echoes may be larger than the signal threshold of true echoes, because multiple echoes can be concentrated through the top, so they cannot be installed in the center.
Ø When there are obstacles in the tank that affect the measurement, it is necessary to install a reflector to measure normally.
Measurement with stirring:
When there is stirring in the measuring tank, please try to stay away from the stirring paddle. After the instrument is installed, it is necessary to perform "false echo learning" in the stirring state to eliminate the influence of false echoes generated by the stirring blade. If foam or waves are generated during the stirring process, the still-pipe installation method should be used.
Installation of guided wave tube:
Ø The instrument is equipped with guide wave tube (or bypass tube) for measurement, which can avoid the influence of obstacles and foam in the container on the measurement.
Ø Due to stirring or some process reactions, foam will be formed on the surface of the liquid, and the foam will attenuate the signal, so a stilling wave tube should be installed for measurement.
Ø Install guide wave tube during measurement, the minimum diameter of guide wave tube should be 50mm. When connecting still pipes, avoid large cracks and welds. If necessary, "false echo learning" is required.
Ø When measuring with adhesive medium, the guided wave tube should not be used.