ELL UItrasonic Non-contact Level Switch

ELL Ultrasonic Non-contact Level Switch is a redun-dant vibration Level switch operates with“frequency ultrasonic" technology. With measurement attaches on outer wall of containers, it will not contact with medium,thus is suitable for level measurement of various medi-ums.

Sensor of the product will generate ultrasonic wave and detect redundant vibration signals inside container wall. When liquid level is higher than sensor, the ampli-tude of redundant vibration will decrease. The product will then detect this change and get a switch signal  output.

（Schematic diagram of measurement principle）

Frequency ultrasonic

 “Frequency ultrasonic" technology is a world leading  signal-change detection technology invented by DHE.

Sonar external liquid level instrument selection manual download

Application

-First choice of level measurement for tanks-Best solution for technical transformation projects

Over-height level or evacuation is easy to lead safety accident and economic loss. According to safety regulations, there shall be level switch installed on tanks thus when liquid level reach to a set upper or lower limitation, an alarm will work to prevent accident.

Since our product is with good performances on aspect of reliable, stable and easy to install and maintenance, Ultrasonic Non-contact Level Switch is widely used in different felds.
 

Upper and lower level limitation detection is the ideal application of ELL-SA series Ultrasonic Non-contact Level Switch. Normally liquid stored in spherical tanks are explosive, flammable, toxic, or with strong corrosive property, thus spherical tanks are taken as key safety management devices. Installation of Ultrasonic Non-contact Level Switch requires no diling, no tank cleaning, no flame operations; measurement process will not contact medium and gas，hence could eliminate all possibility of leakage and ensure safety.

As an important raw material storage tank, horizontal tank is widely used in industries for storing liquid mediums that corrosive, toxic, easy to volatile and form explosive mixture with air such as liquid ammonia and LPG. Hence it is always with high chemical accident ratio. In China, some industries like light industry, power or metallurgy are with low automation level. Normally the only on site level equipment is glass tube or magnetic float level meter. In this case, failure of the main level equipment will easily cause danger. The best solution for level equipment is to install an independent upper limitation alarm switch as spare switch for level equipment already installed.
 

Ultrasonic Non-contact Level Switch could be installed and adjusted quickly, hence cost of preparation and maintenance will be.
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Industry case

The main problem of traditional ultrasonic level switch is interference from attachments on container walls. This interference will affect ultrasonic waves and produce drift according to temperature and time, then change amplitude of  redundant vibration, and result error finally. DHE's patented“Frequency ultrason-ic technology" could effectively eliminate interference and drift, detect signal change accurately; the product could be used for various harsh conditions and operating stably for long term.

The product is manufactured with DHE's“Micro vibration analysis"non-con-tact sonar signal processing technology and world leading manufacture process,hence reliability and durability of the product could be ensured.

Upper and lower level limitation alarm for spherical tank

Upper level limitation alarm for horizontal tank

Upper limitation alarm for vertical tank

In order to avoid over-height level accident,there shall be devices for detection and alarm for tanks. According to safety regulations, there shall be upper limitation alarm devices mount on oil tanks. Since oil tanks are with characteristics of large volume, flammable,explosive, some of tanks are not allow driling,and oil could not contact with air, the tradition-
al float type, immerge type, pressure type,capacitance type or Tuning Fork Type Level Switch will not meet the requirement.However, Ultrasonic Non-contact Level Switch is very suitable for these conditions.

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Equipment protection/ Limitation detection

Pump or equipment damage caused by idling operation will probably increase management cost of the plant or security risk.Our Ultrasonic Non-contact Level Switch could detect the lower level limitation and help to avoid equipment damage.


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