Does a radar level gauge require a sleeve?

It’s not needed under normal circumstances. However, if the liquid level in the medium fluctuates severely, a protective tube can be considered to secure the guided-wave level gauge

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It’s not necessary; a flange or threaded connection will suffice.

If the medium or operating conditions are special, you can contact the flow meter manufacturer to seek their advice

1Q035 When should a guide wave tube be used for radar level gauges? A: SH/T 3104-2013 Code for Installation and Design of Instrumentation in Petrochemical Industries, 8.12.2 Radar level gauges in the following locations shall be equipped with guide wave tubes, and their installation requirements are the same as those for the anti-interference tubes of servo level gauges. a) Measure the liquid level of the floating roof tank ； b) Severe fluctuations in the medium inside the equipment, with a large amount of foam on the surface of the medium ； c) The dielectric constant of the medium being measured is low ； d) The radar beam may be blocked. HG/T 20507-2014 Specifications for the Selection and Design of Automation Instruments 7.2.10.9 In cases where the liquid level to be measured is boiling or subject to significant disturbances, or where the dielectric constant of the medium being measured is low, guided wave tubes (stationary tubes) and other measures should be employed to ensure measurement accuracy. SH/T 3005-2016 Specification for the Selection and Design of Automation Instruments in Petrochemical Industries 8.2.6 f) In situations where there are large fluctuations in the level or interface of the medium being measured, many interference factors are present, or the dielectric constant is low (1.4–2.5), it is necessary to use guided wave tubes (interference-proof tubes) ； According to 6.5.9.1 of GBT50892, the level gauge should be installed at the top of the storage tank; the minimum distance from the tank wall must meet the requirements specified for the product, and it is necessary to avoid any contact with movable parts inside the equipment. When the medium inside the device experiences severe fluctuations, the guided wave rod should be fixed with through-hole protective devices. Additionally, the device has stirring functionality; considering the stress on rod-type radars as well as vortex effects, a waveguide should also be chosen.

For the E+H radar level gauges we use in our company’s light oil tanks, the manufacturer recommended level gauges that come with cables, sleeves, and alignment rings; they work quite well. There are large fluctuations when it’s not aligned with Central