Efficient material handling is essential in mining operations. Ore bins and hoppers act as critical buffer points between crushing, conveying, and processing stages. Maintaining proper material levels inside these storage points helps ensure a steady feed to downstream equipment and prevents costly production interruptions.
Level monitoring systems allow operators to track the amount of material stored in bins and hoppers in real time. Non-contact ultrasonic sensors provide a reliable method for measuring bulk material levels without being exposed to abrasive materials or mechanical wear.
Common Challenges in Bin Level Monitoring
Mining environments present several challenges for reliable level measurement.
Dust and Debris
Crushing and handling bulk materials generates heavy dust. Dust clouds inside bins and hoppers can interfere with many traditional sensing technologies.
Abrasive Materials
Materials such as crushed ore, gravel, and coal are highly abrasive. Mechanical contact sensors can wear out quickly when exposed directly to these materials.
Irregular Material Surfaces
Bulk solids rarely form a perfectly flat surface. Material piles inside bins often create uneven surfaces or shifting angles as the bin fills or empties.
Level sensors must be able to detect these surfaces reliably to provide accurate measurements.
Bridging and Material Build-Up
Some materials can form arches or bridges inside bins, preventing proper discharge. Monitoring bin levels helps operators identify these conditions early and prevent process interruptions.
Using Ultrasonic Sensors for Bin Level Measurement
Ultrasonic sensors provide a practical solution for monitoring bulk material levels in mining bins and hoppers.
These sensors operate by emitting high-frequency sound pulses toward the material surface. The sound pulse reflects off the surface and returns to the sensor. By measuring the time required for the echo to return, the sensor calculates the distance to the material surface.
When mounted at the top of a bin or hopper, the sensor continuously measures the distance to the stored material. As the bin fills or empties, the measured distance changes accordingly.
This information can be transmitted to plant control systems to display real-time material levels or trigger alarms when preset limits are reached.
Typical Mining Applications for Bin Level Monitoring
Ultrasonic sensors can be used in several mining material handling systems.
Surge Bins
Surge bins store material between crushing and conveying stages. Level monitoring prevents overfilling and ensures consistent feed to downstream equipment.
Crusher Feed Hoppers
Maintaining proper material levels in crusher feed hoppers helps regulate feed rates and prevent crusher overload.
Transfer Chutes and Intermediate Storage
Intermediate storage hoppers are used throughout mining plants to balance material flow between different processing stages.
Bulk Storage Bins
Large storage bins used for ore, coal, or aggregates can benefit from continuous level monitoring to improve inventory control.
Integration with Plant Automation Systems
Ultrasonic sensors can be integrated into mining control systems using analog outputs that connect directly to PLCs, digital panel meters, or plant monitoring software.
These signals allow operators to:
- monitor material levels continuously
- set high and low level alarms
- automate feeder control
- regulate conveyor feed rates
This integration helps maintain stable production while reducing manual inspection requirements.
Intrinsically Safe Level Monitoring for Underground Mines
In underground mining environments, instrumentation may need to meet hazardous location requirements due to the presence of combustible gases or dust.
Intrinsically safe systems prevent ignition by limiting electrical energy in hazardous areas to levels that cannot ignite explosive atmospheres.
A typical intrinsically safe level monitoring system includes:
- an intrinsically safe ultrasonic sensor installed in the hazardous area
- a safety barrier installed in the safe area
- Control device or display
This configuration allows reliable level monitoring while maintaining compliance with hazardous location standards.
Improving Material Flow with Reliable Level Monitoring
Accurate level monitoring in ore bins and hoppers plays an important role in maintaining stable mining operations. By providing real-time insight into material levels, operators can regulate feed rates, prevent overfilling, and maintain continuous plant operation.
Non-contact ultrasonic sensors offer a durable and low-maintenance solution for these applications. Their ability to measure bulk materials without direct contact makes them well suited for the demanding conditions found in mining environments.
Request Engineering Assistance
Selecting the right ultrasonic sensor depends on sensing range, output requirements, and hazardous area approvals like: MSHA, ANZEx, ATEX and IECEx. Migatron offers the RPS-409A-MSHA intrinsically safe ultrasonic sensor, designed for use in underground mining environments.
Our engineering team can support the design of MSHA systems and machines with the integration of our sensor for non-contact level detection.
Contact Us for more information.