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Simplified Mine Instruments (SMI) is a Family and Veteran owned company dedicated to enhancing underground mine safety and efficiency through innovative ground monitoring solutions. SMI designs simple, reliable instruments that provide precise insights into ground stability, empowering mining professionals to prevent hazards and optimize operations.
SMI’s mission is to empower underground mining operations with simple, reliable tools that deliver precise and actionable insights into ground stability. We are dedicated to enhancing safety and operational efficiency by providing user-friendly instruments that offer detailed monitoring of roof and ground movements, enabling miners to make informed decisions to prevent hazards.
SMI specializes in ground monitoring instruments tailored for underground mining. Our products focus on detecting roof sag and rock strata movements, offering visual and data- driven insights through robust, easy-to-use tools. These solutions integrate with data loggers or other communication systems for detailed analysis, supporting comprehensive ground control and safety strategies.
SMI is committed to customer success, offering dedicated support through installation guidance, technical assistance, and detailed documentation. Contact us at sales@minershelpers.com for inquiries or support.
Visit www.minershelpers.com for information on SMI’s solutions, specifications, and downloadable resources. To request quotes or place orders, email sales@minershelpers.com.
The SMI Sag Flag is a robust, easy-to-use roof monitor designed for mining operations. It provides continuous visual indication of roof movement, especially roof separation.
The Sag Flag measures rock movements in mine roofs, from a few feet to over 50 feet deep. It uses a reflectorized flag and a scale on the plunger to visually indicate the extent of roof sag or movement, alerting miners to potential hazards.
• Robust Design: Built with stainless steel to withstand harsh mining environments
• Simple Mechanics: Easy to install and monitor without complex equipment.
• Continuous Visual Indication: Uses a reflectorized flag and scale to show movement.
• Versatile Measurement: Capable of detecting roof movements from a few feet to 50+ feet.
The Sag Flag is ideal for mining companies, safety managers, and ground control teams looking to enhance safety by monitoring roof stability and preventing collapses in underground mines.
Installation is straightforward:
• Drill a hole in the mine roof (minimum hole diameter specified in product documentation).
• Insert the Sag Flag unit into the hole.
• Secure the device and ensure the reflectorized flag and plunger scale are visible for monitoring.
• For detailed instructions, download the Installation/Specifications guide or contact
sales@minershelpers.com.
Online sales are currently unavailable. For pricing details, please request a quote by emailing sales@minershelpers.com
Yes, the Sag Flag is designed to complement existing ground control management systems. Adapters can be used to connect to most underground mine monitoring and communication systems, providing a reliable visual early warning tool. For integration details, contact SMI at sales@minershelpers.com.
The Sag Flag can measure rock movements in 25MM increments. Once maxed out, it can be readjusted to continue monitoring.
To locate a distributor please email sales@minershelpers.com.
The Sag Flag’s simplistic mechanics make it user-friendly, requiring minimal training. However, SMI provides support and guidance for proper use—contact sales@minershelpers.com for assistance.
Yes, the Sag Flag pairs well with other SMI ground movement monitoring devices and data loggers.
The Sag Flag is designed as a critical tool for ground control management, helping meet safety requirements by providing early warnings of roof movement. Check with your local regulations and consult SMI for compliance details.
The SMI Miner’s Helper Extensometer is a single-point extensometer designed for underground mining to measure rock strata separations or roof sag. It uses a reflectorized rod that activates when a user-defined amount of movement occurs, providing a visual indication of ground movement.
The extensometer is installed in a borehole in the mine roof or wall. When rock movement exceeds a user-specified threshold, the reflectorized rod activates, visually indicating the extent of movement. This helps miners monitor ground stability and prevent collapses.
• Single-Point Monitoring: Measures rock strata separations or roof sag at a specific point.
• Visual Indication: Uses a reflectorized rod for clear, user-defined movement alerts.
• Robust Design: Built to withstand harsh underground mining conditions.
• Simple Mechanics: Easy to install and monitor without complex equipment.
It is ideal for mining companies, safety managers, and ground control teams who need a reliable, simple tool to monitor roof sag or rock movement in underground mines to enhance safety and prevent collapses.
• Drilling a borehole with a minimum diameter of 1-5/8 inches.
• Inserting the extensometer into the borehole and securing it in place.
• Ensuring the reflectorized rod is visible for monitoring. For detailed installation instructions, download the Extensometer Installation/Specifications guide from www.minershelpers.com or contact sales@minershelpers.com.
Online sales are currently unavailable. For pricing details, please request a quote by emailing sales@minershelpers.com
The MHL selects the amount of movement before the unit trips. This is also resettable and can be adjusted for a total of 2 inches before it needs to be replaced.
Yes, the MHL is designed to complement existing ground control management systems. Adapters can be used to connect to most underground mine monitoring and communication systems, providing a reliable visual early warning tool. For integration details, contact SMI at sales@minershelpers.com.
It is constructed from ACETAL COPOLYMER and non-corrosive metal, ensuring durability in harsh mining environments.
To locate a distributor please email sales@minershelpers.com.
It’s simple mechanics make it user-friendly with minimal training needed. SMI provides support and documentation to ensure proper use. Contact sales@minershelpers.com for assistance or training resources.
It is designed to enhance safety by providing early warnings of ground movement, supporting compliance with mining safety standards. Verify with local regulations and consult SMI for specific compliance details.
While designed for mining, it may be adaptable for other geotechnical monitoring needs, such as tunneling or structural monitoring. Contact SMI at sales@minershelpers.com to discuss specific applications.
The SMI MHR3 is a robust, user-friendly 3-point extensometer designed for underground mining. It monitors rock movement at three distinct points within a borehole, providing precise and comprehensive data on strata separation and roof sag to enhance ground stability analysis and mine safety.
The MHR3 is installed in a borehole with three anchors positioned at user-specified depths. Each anchor is connected to a rod that moves relative to a reference head at the collar of the hole. As rock strata shifts, the MHR3 measures changes in distance between anchors.
• 3-Point Monitoring: Tracks movement at three distinct points in a borehole for detailed ground stability insights.
• Robust Design: Built with durable materials (e.g., Delrin and non-corrosive metal) to withstand harsh mining environments.
• User-Friendly Mechanics: Simple installation, and low maintenance.
• Data Logger Compatibility: Supports remote-readable configurations for precise data collection with devices like the Onset HOBO MX1105.
The MHR3 is ideal for mining companies, safety managers, and ground control teams who need reliable, multi-point monitoring to assess roof and wall stability in underground mines, enabling proactive safety measures and informed operational decisions.
The anchors can be located to monitor specific geologic features such as clay seams. Accurate bolt length can be determined if you know where the rock is separating. By monitoring movement at three points within a borehole, the MHR3 provides comprehensive data on rock strata behavior, detecting potential roof sag or separation early. This allows miners to take preventive actions, reducing the risk of collapses and enhancing safety.
• Drill a borehole (minimum diameter typically 1-5/8 inches, or as specified). Insert the
• Assemble the rod sets and insert into the borehole leaving about 6” sticking out. The rods are color coded to match the numbers on the collar device. Make sure the right color matches with the corresponding number on the collar device.
• Install the collar device over the rods and insert it into the hole then set the anchors of the collar by inserting the Allen wrench in the middle hole and tightening clockwise.
• With the collar device tightened, take readings of each rod using a digital depth gage.
• Detailed installation guides are available at www.minershelpers.com or by emailing sales@minershelpers.com.
The MHR3 can monitor rock movements from a few feet to over 50 feet, depending on borehole depth and anchor placement. The three-point design provides detailed insights across multiple strata layers. Contact SMI at sales@minershelpers.com for specific range and configuration details.
Yes, the MHR3 supports remote-readable configurations, pairing with data loggers like the Onset HOBO MX1105. Displacement sensors convert movement into voltage signals (0–2.5 V DC), which are logged and scaled to linear movement (e.g., millimeters) using software like HOBOconnect or HOBOware for precise, multi-point analysis.
The MHR3 is constructed with robust materials, such as Delrin and non-corrosive metal, ensuring reliability in harsh mining conditions, including dust, moisture, and physical stress, for consistent performance and long-term use.
The MHR3 monitors three points within a borehole for a more comprehensive stability profile, while the Miner’s Helper Extensometer is a single-point device. The MHR3 is ideal for complex strata where multi-point data provides deeper insights into ground behavior.
Yes, the MHR3 complements other SMI instruments, like the Sag Flag, for visual monitoring and can integrate with broader ground control systems via data loggers. Contact sales@minershelpers.com for compatibility and integration details.
The MHR3 is designed to enhance ground control and safety, supporting compliance with mining standards by providing detailed, multi-point monitoring of ground instability. Verify specific regulatory requirements with local authorities and consult SMI for compliance details.
The MHR3 is not available for online purchase. To request a quote or place an order, email sales@minershelpers.com. It is also available through distributors like Carroll Technologies (606-573-1000, www.carrolltechnologiesgroup.com).
The MHR3 requires minimal maintenance due to its robust design. Regularly inspect for physical damage or debris in harsh environments and ensure sensor connections are secure for remote-readable setups. Refer to product documentation or contact SMI for guidance.
SMI offers dedicated support, including installation guidance, technical assistance, and documentation. Contact sales@minershelpers.com for help. If purchased through Carroll Technologies, access MinerCare 24/7 for round-the-clock technical support and spare parts.
The HOBO MX1105 is a Bluetooth-enabled, wireless data logger with four analog input channels that measure voltage (0–2.5 V DC) and transmit data to a mobile device or Windows computer. When used with the SMI Sag Flag or Miner’s Helper Extensometer (MHL), it logs voltage outputs from sensors attached to these instruments, which are then scaled to measure linear movement (e.g., roof sag or rock strata separation) in mining environments.
The Sag Flag or MHL is paired with a sensor that works well with the data logger. The MX1105 logs this voltage, and you can use Onset’s free HOBOconnect app or HOBOware software to scale the voltage readings to linear movement (e.g., millimeters or inches) based on the sensor’s calibration curve. Each sensor is scaled before being shipped by SMI.
• Four Analog Inputs: Connect up to four Sag Flag or MHL sensors to monitor multiple points simultaneously.
• Voltage Range: Measures 0–2.5 V DC with ±0.3 mV ±0.3% accuracy, suitable for most displacement sensors.
• Bluetooth Connectivity: Wirelessly configure and download data using the HOBOconnect app within a 100-foot range.
• LCD Alarms: Audible and visual alarms alert if a sensor disconnects or movement exceeds set thresholds.
The MX1105 supports sensors with 0–30 V DC output, such as linear displacement transducers or potentiometers that convert the mechanical movement of the Sag Flag or MHL into voltage. Ensure the sensor’s cable has integrated strain relief for secure connection. Contact sales@minershelpers.com for recommended sensors.
Connect the Sensor: Attach the displacement sensor’s output cable to one of the MX1105’s analog input channels.
• Configure via HOBOconnect: Use the free HOBOconnect app on a mobile device or
Windows computer to set the logging interval (1 second to 18 hours), select voltage measurement, and enable alarms for movement thresholds.
• Scale Voltage to Movement: In HOBOconnect or HOBOware, input the sensor’s calibration curve (e.g., voltage-to-distance ratio) to convert voltage readings to linear movement (e.g., mm or inches).
• Deploy the Logger: Place the MX1105 in a protected, non-submerged location within the mine (IP50 rating).
• Refer to the MX1105 manual or Getting Started guide at www.onsetcomp.com for detailed instructions.
The MX1105 measures voltage with an accuracy of ±0.3 mV ±0.3% of the reading. The accuracy of the linear movement depends on the sensor’s calibration and linearity. For example, a sensor with a 0–2.5 V output for 0–25 mm movement provides high-resolution data when scaled correctly. Verify sensor specifications for total system accuracy.
Yes, with an MX Gateway and an MX Data Plan, the MX1105 can automatically transmit data to the HOBOlink cloud platform via Wi-Fi or Ethernet, allowing remote monitoring of Sag Flag or MHL movement. Data refreshes every 10–20 minutes, with alarms sent every 1–15 minutes. Ensure the gateway is within 100 feet (line-of-sight) of the logger. Note that the MX1105 is not suitable for submerged environments.
• Memory: The MX1105 has 128 KB of memory, storing up to 84,650 measurements (e.g., ~21,162 measurements per channel with four sensors). At a 1-hour logging interval, this supports over 2 years of data.
• Battery Life: Typically 1 year at a 1-minute logging interval with Bluetooth Always On. Faster logging, burst mode, or continuous app connection reduces battery life. Use replaceable AAA batteries for extended deployments. Manufacturer suggests replacing batteries once a year.
Within 100 feet of the logger, use the HOBOconnect app to:
• Download data (takes ~60 seconds for full memory).
• View graphs of voltage or scaled movement data.
• Export data as CSV files for analysis in Excel or other software.
• Alternatively, use HOBOware Pro for advanced analysis, including scaling and statistical calculations (e.g., minimum, maximum, average movement).
In the HOBOconnect app:
• Configure alarm thresholds for each analog channel based on scaled movement (e.g., alert if movement exceeds 20 mm).
• Enable audible and visual LCD alarms to notify if a sensor disconnects or movement exceeds the threshold.
• With an MX Gateway, receive remote alarm notifications via HOBOlink.
The MX1105 has an IP50 rating, suitable for indoor, non-submerged environments. In mines, protect it from moisture and physical damage by placing it in a shielded enclosure or safe area. Its operating range is -20° to 70°C (-4° to 158°F), compatible with most underground conditions.
The MX1105’s LCD and audible alarms will alert you if a sensor becomes unplugged. If the issue persists, inspect the sensor or contact SMI at sales@minershelpers.com for troubleshooting.
The MX1105 is user-friendly with the HOBOconnect app, requiring minimal training. Familiarity with the Sag Flag/MHL sensor’s calibration is needed for accurate scaling. Onset provides a Getting Started guide, and SMI offers support at sales@minershelpers.com.
For Sag Flag/MHL integration support, contact SMI at sales@minershelpers.com. Onset offers unlimited free technical support at 1-800-LOGGERS.
• Replace the two AAA batteries annually or when the LCD indicates low battery.
• Ensure sensor cables are secure and undamaged.
• Periodically check the logger for dust or debris in mining environments.
• No calibration is needed for the MX1105 itself, but calibrate the displacement sensor per the manufacturer’s guidelines.
Simplified Mine Instruments designs and manufactures rugged monitoring systems that help mining professionals detect ground movement and ensure underground safety.
