Minimate Pro Sensors

Minimate Accelerometers

Each Accelerometer measures vibration in one plane. The Accelerometer can be oriented to measure either transverse, vertical or longitudinal vibrations. Accelerometers are small and can be used in applications where a geophone cannot be mounted. Instantel Accelerometers have even been mounted on museum exhibits and historical artifacts to ensure that the construction outside the building does not negatively impact the items inside the building. There are three Accelerometers for the Minimate Pro monitoring unit. Each Accelerometer has a unique amplitude range varying from 0.5g to 500g.

The 0.5g Accelerometer measures low frequencies and accelerations for sensitive monitoring applications including computer rooms, integrated circuit manufacturing, optical balances or electron microscopes. The 50g and 500g high frequency Accelerometers measure acceleration up to 50g or 500g for near field blasting applications.

When you need to record acceleration in three planes, the Accelerometer Mounting Block can be used to connect up to three uniaxial accelerometers in a triaxial configuration. The Accelerometer Mounting Block provides flexibility for installation configurations. With the Accelerometer Mounting Block, you can mount one, two or three accelerometers depending on what planes you need to monitor. The Accelerometer Mounting Block can be bolted directly to the structure you need to monitor.

THOR’s advanced analysis features are required to program the Minimate Pro monitoring unit for use with Accelerometers.

Product Name 0.5g Accelerometer 50g Accelerometer 500g Accelerometer
Frequency Range 0.5 to 500 Hz 1 to 3000 Hz t to 300 Hz
Measurement Range 0.5G 50G 500G
Maximum Shock Limit 10g 2000g 2000g
Minimate Hydrophones

The Hydrophone for the Minimate Pro measures overpressure activity underwater. Overpressure, typically produced by blasting activities, can damage underwater structures and ecosystems. They can also cause behavioural or physiological changes in fish and other marine mammals. Potential effects can negatively impact their health and reproduction. To ensure that you are within environmental regulations the Hydrophone can measure pressure changes up to 47 psi. Four hydrophones can be connected to the Minimate Pro4 and up to six on the Minimate Pro6.

Installation is easy – just connect the Hydrophone to a Minimate Pro monitoring unit and then drop it into the water. Whether you are in calm or turbid water, the Hydrophone will take an ambient pressure reading and then record any changes to that pressure. With sensors encased in a high impact polyurethane, the Hydrophone is designed to handle maximum depths of 250 feet.

Since overpressure can be higher in frequency but short in duration, Instantel recommends the sampling rate for the hydrophone be set to 65,536 Hz on the Minimate Pro unit. THOR’s advanced features are required to program the 65 kHz.

Click here for more information on Instantel’s underwater monitoring solutions.

Product Name Hydrophone
Frequency Range 8 to 500 Hz
Amplitude Range Up to 47 psi (324 kPa)
Minimate Microphones

There are three microphones designed for the Minimate Pro monitoring unit, so you can synchronize the recording of vibration with air overpressure or sound/noise.

The Linear Microphone is designed to measure air overpressure typically produced from blasting activities. Air pressure changes produced by blasting or demolition can be damaging to nearby structures. When levels are high enough, air overpressure can break windows, damage electronic equipment and set off car alarms. Understandably, when a home or building owner hears their windows rattle, they believe that their property is being damaged. The Minimate Pro Linear Microphone is designed to monitor these changes on a linear scale so you can be sure you are within industry guidelines. Recording of air overpressure can also be a best practice for construction companies, mines and quarries to protect against complaints or liability claims.

Similar to the Linear Microphone, the High Pressure Microphone measures air overpressure levels. Blasting in confined spaces, like mines or tunnels, can amplify the effects of the air overpressure. Extreme levels of air overpressure can even blow the doors off shafts. The High Pressure Microphone can record high air overpressure levels at up to 69 kPa (10 psi) on a frequency range from 5 to 1000 Hz. Recording with the High Pressure Microphone ensures that you measure all of the require frequencies.

The Sound Level Microphone for the Minimate Pro, also called a noise microphone, can perform unattended monitoring of noise in applications such as construction, traffic and quarries or open pit mining operations. Safe guidelines have been developed which provide limits on the level of noise that can be induced in urban environments or to protect the safety of nearby workers. The Sound Level Microphone meets the requirements for IEC 61672 Class 1 specifications, which include A and C weighted specifications. When combined with THOR’s advance analysis tools, the Minimate Pro can be configured to record at samples rates up to 65 kHZ. Recording at 65 kHZ, the Minimate Pro can play back sound clips recorded with the Sound Level Microphone.

The microphones for the Micromate connect directly to the color-coded microphone port on the monitoring unit. Each microphone comes with metal microphone stand for mounting and a 2m or 5m cable. Custom cable lengths of up to 75 m are available upon request.

Product Name Linear Microphone Sound Level Microphone High Pressure Microphone*
Description Measures air overpressure on a linear scale. Measures noise or sound levels. Meausres air overpressure from close in or confined blastiing activities.
Compliance Standard ISEE 2011 Edition IEC 61672 Class 1 ISEE 2011 Edition
Frquency Range 2 to 250 Hz 10 Hz to 20 kHz 5 to 1000 Hz
Measurement Range 100 to 148 dB (0.00029 to 0.0725 psi) 30 to 140 dB Up to 69 kPa (10 psi)
Minimate Borehole Geophones

The triaxial Borehole Geophone is lowered into a borehole to measure ground vibration in three planes: vertical, transverse and longitudinal. Vibrations from construction activities, blasting and other applications can travel through the ground and cause damage to underground structures. The Borehole Geophone can be lowered into a hole to monitor the effects of the vibration directly next to the structure without the need for regression analysis. Monitoring vibrations with an Instantel geophone can prevent any damage done to underground sewers, tunnels, gas lines or other structures.

The High Frequency Borehole Geophone for the Minimate Pro monitor is designed to be lowered into a borehole and measure frequency ranges from 30 to 1000 Hz. Vibration levels dissipate as they travel farther away from the blast. As you get closer to the vibration source, the frequencies increase. When monitoring vibrations in a tunnel or mine, blasting, digging and other activities can take place in close proximity to other tunnels. Using a High Frequency Borehole Geophone, you can measure directly beside a tunnel or structure that is close to the vibration source. Recording the vibration with a High Frequency Borehole Geophone ensures that you capture all of the required frequencies.

The Minimate Pro Borehole Geophones are rugged and water resistant. The internal sensors are mounted in an aluminum case which is filled with epoxy to protect against contaminants commonly found in boreholes, like water, dust or dirt. The Micromate Borehole Geophone comes in two standard cable lengths: 100 feet and 250 feet. The Borehole Geophone can also be custom built with up to 1000 meters of cable. It is compatible with any Micromate monitoring unit and can be calibrated to meet industry standards like the International Society of Explosive Engineers (ISEE) and DIN.

The Minimate Pro Borehole Geophones come in two cable lengths, 100 feet and 250 feet.

Product Name ISEE Borehole Geophone DIN Borehole Geophone High Frequency Borehole Geophone*
Compliance Standard ISEE 2011 Edition DIN 45669-1 Class 1 N/A
Frequency Range 2 to 250 Hz 1 to 315 Hz 30 to 1000 Hz
Measurement Range Up to 10 in/s Up to 10 in/s Up to 100 in/s
Minimate Geophones

The Minimate Pro triaxial Geophones measure ground vibration in three planes: vertical, transverse and longitudinal. There are four geophones compatible with the Minimate Pro monitoring unit. Each geophone measures a unique frequency range conforming to standards such as the ISEE and DIN specifications. For easy identification, the geophone lids are color coded by standard.

The ISEE and DIN geophones are used to measure ground vibrations induced by construction, blasting, mining, quarry and other operations. Since these vibrations can cause damage to property and structures, local, state and federal regulations govern the levels of vibration these activities can create. Monitoring the vibration levels with an Instantel geophone can help you adjust your vibration inducing activities before these limits are reached and concerns develop. It can also serve as a record that to protect you against future claims and liability.

The High Frequency Geophone for the Minimate Pro monitor is designed to measure frequency ranges from 30 to 1000 Hz. Vibration levels dissipate as they travel farther away from the blast. When measuring vibrations for blast design, you need a geophone that can measure closer to the blast. As you get closer to the vibration source, the frequencies increase. Recording the vibration with a High Frequency Geophone ensures that you capture all of the required frequencies.

The Vibration Dose Value (VDV) Geophone from Instantel measure vibrations between 1 and 80 Hz. It conforms to industry standards for human exposure to vibration. When vibration levels are high enough, they can have adverse health effects on human beings such as chronic fatigue, numbness or joint pain. Repeated exposure to vibrations can have similar effects. The VDV Geophone provides more resolution in your data and ensures that your VDV calculations are within limits. For construction companies or transit authorities, it can serve as proof that your activities were not adversely impacting neighbor building occupants.

Each Instantel geophone is designed with an aluminum housing that stands up to the toughest conditions, they are designed to withstand long-term installations. The geophone can be bolted directly to hard surfaces or it can be spiked into a soft surfaces. The geophone connects directly to the color-coded geophone port on the Micromate monitoring unit and comes in cable lengths of 2m or 5m. While these cable lengths are standard, Instantel also offers custom cable lengths up to 1000 meters.

Product Name ISEE Geophone DIN Geophone Vibration Dose Value Geophone High Frequency Geophone*
Compliance Standard ISEE 2011 Edition DIN 45669-1 Class 1 DIN 45669-1 Class 1 N/A
Frequency Range 2 to 250 Hz 1 to 315 Hz 1 to 80 Hz 30 to 1000 Hz
Measurement Range Up to 10 in/s Up to 10 in/s Up to 10 in/s Up to 100 in/s