External liquid level switch with Alam Monitoring Function, the probe attached outside of tank (Model: HS-ULC)

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Product Details

Product Description

The Ultrasonic Liquid Level Control is a new type for liquid level monitoring and alarming, which probes are installed outside of the tank wall, without holing on the tank make it easier to measure. It is applied for pharmaceutical industry, oil industry, chemical industry, power industry and other fields, it's very suitable for strong toxic, corrosion and dangerous liquid level measurement.

The high frequency ultrasonic pulse produced by the probe can pass through tank wall and transmit between the tank wall and liquid, and then be reflected back. By detecting and calculating the reflective behavior, the level switch can identify whether there is liquid at the monitored position. The liquid level switch can send relay signal to succeeding device or other equipment at the mean time, which can realize the function of simultaneous monitoring or controlling.

Technical Parameters

Repeatability error


Measurable tank wall thickness

Max 70mm

Ambient temperature

-50℃~+60℃ (-58 °F ~ 140 °F)

Ambient humidity

15% ~ 100%RH


DC 24V(18 ~ 36V)  0.05A

Output signal

Relay output (1 unit single-pole, double-throw control contact is passive nodes)

Relay capacity

DC 30V 6A / AC 250V 6A

Electrical interface

Different types available for different operating condition

Diameter of threading hole

Φ8mm ( adaptive cable diameter Φ6~8mm)


1. A wide range of application: it can be used for measuring the strong toxic, highly corrosive, high pressure liquids, and various liquids in kinds of complex conditions or under the explosive gas atmospheres;

2. High precision, fast reaction, high stability;

3. Anti-interference ability;

4. Easy to install and maintenance, no fire, no holing, no stopping the production;

5. Easy to operate, long life time, and does't need user to maintain.

Structure Schematic

   Probe and Cable Component.jpg

                       Contrl meter structure                                               Probe and Cable Component

Installation Diagram

  spherical tank installation.jpg

                            Vertical tank                                                                        Spherical tank

tank installation.jpg

Application Fields

1. Measurable Tank Material: The probe installation area on tank wall should be hard material with good conductivity such as carbon steel, stainless steel, various hard metal, fiber glass, epikote, rigid plastic, ceramics, glass, rigid rubber and other composite material. The internal and external surface of installing position should be smooth. If there are multipal layers in tank wall, the layers should compact without foam or air gap such as sulfide rigid rubber lining, epikote lining, stainless steel lining, and titanium.

2. Tank wall thickness: 2-70mm

3. Measurable tank type: Horizontal tank, spherical tank, vertical tank and so on. 

4. Medium: The measurement result is not interfered by density, permittivity, temperature, pressure, purity, viscosity of medium

  level control.jpg

  level controller for alarming.jpg

  level control for monitoring.jpg

Selection Guide

Explosion proof Mark: Ex d II CT6 GB


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Smagall is a leading innovator, manufacturer and distributor of sensors and sensor-based systems, specializing in providing instrumentation with measurement and control for continuous liquid level and magnetic field measurement for various industries. Since 2001, our reputation is built on high standards of dependability and product quality backed by responsive customer service and competent technical support. We are selling our solutions and products to the main markets globally including the USA, Pan-Europe and Asia-pacific countries and having great selling record and long-term cooperation with local partners. Moreover, we are honored to be the official vendor for many world-known enterprises and institutes.