The Accelerometer Triaxial Mounting Block can be used to install uniaxial 50 g or 500 g high level accelerometers in a triaxial configuration.
The uniaxial accelerometers are mounted on the Triaxial Mounting Block in the transverse, vertical and longitudinal positions. Use an adaptor cable, the three accelerometers can then be connected to the geophone port on the Minimate Pro monitoring unit for synchronized readings of all three directions
The Wire Make/Break Trigger Cable can be used to remotely trigger a Minimate Pro unit or to synchronize the triggering of up to six units. At the end of the Wire Make/Break Trigger Cable there are two leads. A change in the state of these leads will cause the Minimate Pro unit to start monitoring. They can be connected to start and once that connection is broken, the unit will start to record, or they can be separated initially and when they make a connection the Minimate Pro will start to record. The External Trigger Cable connects to the auxiliary port on the Minimate Pro unit and comes complete with a 2 m (6.5 ft) cable.The External Trigger Cable can also be used with Instantel’s 30 m (100 ft) or 75 m (250 ft) extension cables.
- Twist the two leads together and use an energy source, such as a blast, to break the two leads apart, triggering the Minimate Pro unit to start recording. Typically, the two leads are tied together and then wrapped around a detonator or explosive before being lowered into a borehole. When the explosives detonate, the two leads on the external trigger cable will break apart and automatically trigger the unit to start recording. This will give you time 0 or when the blast started. As each hole in the blast design is detonated it will create a peak in the waveform. Using time 0, you can calculate the time between each peak and compare it to the time delays between each hole and row in your blast design. You can then use this data to help you design a more controlled and precise blast.
- Velocity propagation of the rock is a key part of blast design. Using the External Wire Trigger Cable you can measure accurate velocity propagation values from the rock you are blasting. The External Wire Trigger Cable can be used to synchronize event recordings on up to six Minimate Pro monitoring units. After connecting an External Trigger Cable to each unit and tying their leads together, when one Minimate Pro unit is triggered and begins recording, the other connected Minimate PRo units will also begin to record. The time it takes for the vibration to travel from one Minimate Pro unit to the next can be used to get an accurate velocity propagation value.
The Remote Alarm Controller is used to indicate when the Minimate Pro unit has exceeded the trigger levels you’ve configured. When you connect lights or sirens to the Remote Alarm controller, you can receive audible or visual alerts that your activities are near or have exceeded the trigger levels. Trigger levels on the Minimate Pro can be set based on your project’s requirements and can be different for each job. With an early warning system, you can manage vibration or noise inducing activities before concerns develop.
The Remote Alarm Controller connects to the auxiliary port on the Minimate Pro monitoring unit. The Remote Alarm Controller comes complete with a 2 m (6.5 ft) cable but it can also be used with Instantel’s 30 m (100 ft) or 75 m (250 ft) extension cables.