Within the measurement range, determined not to come into contact with the cable or rod internal obstacles, Therefore, the installation should be avoided as far as possible the tank facilities, such as: human ladder, limit switches, heating devices, stand etc. Also note that the cable or rod may not intersect with the material during feeding.
Highest Level measurement can not enter into the blind; Must be maintained between the instrument and the tank wall a certain distance; When the meter is installed, try to stick with cable or perpendicular to the surface of the measured medium. Meter installation in hazardous areas must comply with state regulations explosion hazardous installation area. Intrinsically safe instrument requires the use of shell with aluminum. Intrinsically safe instrument can be installed in explosion-proof requirements of the occasion, the instrument must be connected to the earth.
Ø Reasonable meter installation to ensure long-term reliable and accurate measurement
Guided wave radar level meter adopts thread and flange connection and can be installed on short pipe. The smaller the diameter of the installation pipe, the shorter the pipe length, and the more stable the measurement. When the diameter of the installation short pipe is 2" to 6", the height of the installation short pipe should be ≤200mm. If the short tube is long, it is best to shorten the short tube or lengthen the sensor shielding section.
Ø Installation in short pipe of DN200 or DN250:
When the guided wave radar is installed on a short tube with a diameter greater than 200mm, the inner wall of the short tube will generate echoes, which may easily cause measurement errors due to the low dielectric constant of the medium. Therefore, for a short pipe with a diameter of 200mm or 250mm, a special flange with a "horn interface" needs to be selected.
Ø Installation Notes on plastic containers:
Whether cable or rod type, if you want to guided wave radar is working properly, the process of connecting to the metal surface should be. When the guided wave radar mounted on a plastic pot, If the tank top is plastic or other non-conductive material, the instrument needs with metal flanges, the use of threaded connections, to be equipped with a metal plate.
The rod probe can be up to 6 meters long. For storage tanks with a measuring distance of more than 6 meters, cable probes are used.
If there are many obstacles in the tank or the probe is easily approached to the sensor, the guided wave-pipe device can be added for measurement.
Pull down force on the rope
When feeding and discharging, the medium produces a pull-down force on the cable probe. The pull-down force depends on the following factors:
A. The length of the rope B. The density of the material
C. The diameter of the storage bin D. The diameter of the rope
Optimization of interference
Interference echo suppression: Programming and debugging software can realize the suppression of interference echo, so as to achieve the ideal measurement effect.
For media with a viscosity not greater than 500cst (only for liquids), bypass pipes or guided wave-pipe can be used to avoid interference.
Installation of low dielectric constant liquid
For media with dielectric constant greater than 1.3, viscosity ≤ 500cst and not easy to produce adhesion, the guided wave-pipe can be installed for measurement, and the following effects can be achieved:Installation and fixation with the same measurement of solid powder compartment.
Excellent reliability, high precision
It can be used for any medium with a dielectric constant ≥1.3, and the measurement has nothing to do with the conductivity of the medium
Obstacles in the tank and the size of the short pipe do not affect the measurement
Corrosive medium measurement:
If measuring corrosive media, you can use rod or cable probe sleeve PTFE, PFA sleeve for measurement.
Ø For guided wave radars with too long cables in field use, it is necessary to cut off the excess cables, and the cables cannot be knotted, entangled or attached to other objects.
Ø When cutting the cable, first cut off the power of the instrument, remove the cable, remove the screws, cut from the bottom of the cable, and install the weight after the cut is completed, and then the power can be switched on and the parameters can be reset.
Ø For cable guided wave radar with protective sleeve, when the cable is too long, it must not be intercepted by itself, and it must be returned to the original factory for cutting.
Ø For the instrument installed in the still-pipe, the radar probe must be fixed with an insulating bracket to ensure that the radar probe (rod/cable) and the still-pipe are concentric, otherwise the measurement will be affected by vibration or false echo.
Installation of right and wrong