An ultrasonic level transmitter is a non-contact instrument for continuous level measurement of liquids and bulk solids in tanks, vessels, pits and open channels. It provides local display and output signals for monitoring and control.

The sensor emits high-frequency sound pulses toward the surface of the medium. The sound reflects from the surface back to the sensor, and the transmitter measures the round-trip time. The distance is calculated as the speed of sound multiplied by the travel time, divided by 2 (for the out-and-back path). The level is then calculated from the tank height minus this distance.

Yes. Ultrasonic level transmitters are used for most liquid and solid surface measurements. For solids, the surface angle, dust and particle size affect the echo, so please send us your material details for confirmation.

• MIK-MP: versatile transmitter with ranges of 0–5, 10, 15, 20 or 30 m, 0.35 m blind zone, ±0.5% FS accuracy (±0.2% optional), LCD display, and 4–20 mA, RS485 and relay outputs
• MIK-ZP: universal, fully digital ultrasonic level transmitter with level monitoring, data transmission and man-machine communication
• MIK-ULS-B and MIK-MP-C: non-contact, cost-effective transmitters for most liquid and solid level applications
• MIK-ZPM: microprocessor-controlled digital ultrasonic level meter
• MIK-JFC: ultrasonic mud (sludge interface) level transmitter for measuring sludge thickness under water

If you are unsure, send us your application details and our engineers will recommend a model.

The blind zone is the short distance directly below the sensor where the level cannot be measured, because the sensor is still ringing after transmitting. The maximum level must stay below this zone. For example, the MIK-MP has a blind zone of 0.35 m.

Accuracy depends on the model. For example, the MIK-MP offers ±0.5% FS, with ±0.2% FS optional. Actual accuracy also depends on installation and process conditions.

Outputs depend on the model. For example, the MIK-MP offers optional 4–20 mA (load <500 Ω), RS485 and 2 relays, with a freely adjustable analog output range and custom serial data format.

Power supply depends on the model. For example, the MIK-MP is powered by 14–28 VDC, with 85–305 VAC (50/60 Hz, 5 W max) optional, and its power consumption is below 1.5 W.

Yes. The MIK-MP can measure level or distance, and offers optional increment/difference distance measurement to measure air space or liquid level.

Use the MIK-JFC ultrasonic mud level transmitter. Also known as an ultrasonic sludge interface meter, it transmits ultrasonic waves through the liquid to detect the mud level under water and measure sludge thickness in fixed containers.

Yes. Thick foam can absorb the sound signal, and heavy vapor, dust or strong turbulence can weaken or scatter the echo. The MIK-MP allows the transmitted pulse intensity to be set from 1 to 15 to suit working conditions. For difficult conditions, a radar level transmitter may be more suitable.

Yes. The speed of sound changes with air temperature, so ultrasonic transmitters generally use temperature compensation to correct the distance calculation. Large temperature gradients in the vapor space can still affect accuracy.

The measuring ranges of the MIK-MP are specified for non-explosive fluids. If your application is in a hazardous area, please tell us the area classification so we can confirm a suitable solution.

• Ultrasonic: non-contact and cost-effective for most liquids and solids in open or vented vessels; affected by foam, vapor and dust.
• Radar: non-contact and less affected by vapor, temperature and pressure; suitable for more demanding process conditions.
• Hydrostatic: submersible or contact measurement based on liquid pressure; not affected by foam or surface conditions.

• Mount the sensor perpendicular to the medium surface.
• Keep the maximum level below the blind zone.
• Avoid inlets, agitators, ladders and other obstacles in the sound path.
• Keep a suitable distance from the tank wall.
• Avoid direct sunlight and strong vibration where possible.

Please follow the installation manual of the selected model.

For example, the MIK-MP has IP65 protection as standard, with other ratings optional. Please check each product page or tell us your installation environment.

They are widely used in chemical, mining, aggregate, power generation, pulp and paper, iron and steel, wastewater, food and beverage, and quarry applications.

To help us select the correct model, please provide:

• Medium (liquid or solid) and its properties
• Measuring range and tank or pit dimensions
• Process conditions (foam, vapor, dust, temperature, pressure)
• Installation method and mounting connection
• Output requirements (4–20 mA, RS485, relays)
• Power supply (DC or AC)
• Hazardous area requirements (if any) and quantity

Send your requirements to info@asmik.com or contact us via WhatsApp at +86 13325716921.