The ultrasonic level switch is a device that uses an inaudible high-frequency acoustic wave (ultrasonic wave) to detect the presence of liquid at a specified point. The device is composed of electronic control unit and a sensor. The ultrasonic level switch uses the characteristics of sound wave transmission in steam and liquid to detect the liquid level.
Additional information
Description
The ultrasonic level switch is a device that uses an inaudible high-frequency acoustic wave (ultrasonic wave) to detect the presence of liquid at a specified point. The device is composed of electronic control unit and a sensor. The ultrasonic level switch uses the characteristics of sound wave transmission in steam and liquid to detect the liquid level.
The two core functions of Marine liquid level switches:
1. Bottom water level alarm
As a bottom water level alarm device, it can be used for monitoring and alarming the water level in various ship compartments, providing timely warnings of leakage or water accumulation risks.
2. Linked equipment start/stop
It drives other equipment to operate. For example, it can link with water pumps: when the water level reaches the set height, the water pump will automatically start to pump water, achieving automatic drainage control.
Technical parameters
- Power supply24 VDC
- Standby current4…5 mA
- Output current16±1 mA
- Sensitivity5 mm
- Delay0.5 s
- Mounting3/4 NPT
- Stem materialTitanium Alloy
- Temperature-30℃ to 80℃ / -22°F – 176°F
- Protection gradeIP67
- Weight200g/0.44lbs
Factor 1 must be considered before selecting the switch
Only for liquid media-The measured medium must be liquid. The ultrasonic level switch cannot distinguish the interface between two different liquids. Factor 2 must be considered before selecting the switch
Clean liquids only –liquids with too much solid content do not transmit sound waves well enough to be detected. Typically 5% suspended solids is the maximum allowed.
Factor 3 must be considered before selecting the switch
The fluid has to flow — if the fluid is too viscous to flow through the 1.9cm or so gap, the device won’t function properly.
Principle
2.The transmitting crystal continuously emits high-frequency ultrasonic pulses, which pass through the gap and reach the receiving crystal.
3.When the gap is filled with gas (not submerged by liquid), the sound waves significantly attenuate in the gas, and the receiving crystal hardly receives any signal.
4.When the liquid level rises and the gap is filled with liquid, the sound waves can efficiently conduct through the liquid, and the receiving crystal receives clear signals.
5.The electronic control unit determines the “with liquid/without liquid” status based on the presence or strength of the signal, and outputs the corresponding switch signal to drive the alarm or interlock equipment.
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Ultrasonic Marine Liquid Level Switch – point level ultrasonic for liquid
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