Application
It is used for continuous high-precision measurement of the level of liquid products in large storage tanks during accounting, calculation and technological operations.
It is used on liquid media of low viscosity in the absence of suspended solids.
It is operated at the facilities of the chemical, pharmaceutical, food, oil and gas, fuel and energy industries, mechanical engineering.
It can be installed in open areas under the influence of atmospheric precipitation and solar radiation in explosive areas of premises and outdoor installations.
Peculiarities
- anti-vandal housing made of aluminum alloy or stainless steel
- high resolution
- measuring range up to 15 m
- ambient temperature -50 to +100 °C
- a large selection of devices for fastening cable sheaths (metal hoses, armored cables, pipes)
- the level of explosion protection is extra-explosion-proof.
Description
Inside the shell formed by the body of the level gauge and the guide, there is an electronic module consisting of a probe located inside the guide and a signal processing unit. The probe contains a sound guide made of a magnetostrictive material. The sound duct is inserted into a fluoroplastic tube, on which a winding is wound along the entire length. A signal processing unit with a terminal clamp for connecting external circuits is installed inside the level gauge housing. The level gauge has internal and external ground clamps.
The principle of operation is based on the phenomenon of magnetostriction.
The float with a magnet slides freely along the surface of the guide, taking a position relative to the probe, depending on the level of the controlled medium. A current pulse is passed through the probe winding, as a result of which a magnetic field pulse is created along the entire length of the sound duct. At the location of the float with a permanent magnet, under the influence of the effect of magnetostriction, an elastic deformation pulse arises, which propagates along the sound duct. The impulse reaches the end of the sound duct and is fixed by the signal processing unit with the help of a piezoelectric element. The unit measures the time intervals from the moment the current pulse is formed in the probe winding to the moment the elastic deformation pulse is received from the float. Since the propagation velocity of the elastic deformation impulse in the sound duct is constant, this allows determining the distance to the float location, determined by the position of the level of the controlled medium.
The signal processing unit generates 4-20 mA output signals in accordance with the measured level, and also provides operation according to the HART protocol.
