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2.2 Safety Considerations
The MicroTrap™ VOD/Data Recorder is an easy and safe instrument to operate. However, one should be aware of the inherent risk
associated with explosives handling and familiar with working in blasting environments. For this reason, it is always recommended that
only knowledgeable personnel, experienced in handling explosives and familiar with blasting procedures, operate the MicroTrap™
VOD/Data Recorder when testing explosives. The standard rules of safety used with explosives should apply when monitoring VODs or
other explosive parameters.
When recording VODs, the MicroTrap™ VOD/Data Recorder outputs a low voltage (less than 8 V DC) and an extremely low current (less
than 50 mA) to the probes within the explosives from the VOD connector on the MicroTrap™ VOD/Data Recorder. This low excitation
signal ensures that the MicroTrap™ will not prematurely initiate explosives and/or detonators. With the optional MicroTrap™ Scope
Upgrade installed, the MicroTrap™’s Scope channels do not output any excitation voltage or signal.
Standard (and common sense) rules apply when it comes to the presence of electrical storms near the testing area. Due to the inherent
hazards associated with blasting during these storms, in addition to the possibility of electrical interference causing false trigger signals
to the MicroTrap™ VOD/Data Recorder, it is recommended to immediately suspend all blasting activities and evacuate the area. This is
standard policy at most blasting operations.
2.3 VOD Applications
When used as a VOD recorder, the main applications of the MicroTrap™ VOD/Data Recorder include:
2.3.1 Testing of Explosive Samples
• Test the performance of explosives against the quality control standards stated by the manufacturer.
• Measure the continuous VOD in any charge diameter under confined or unconfined conditions.
• Determine the critical diameter and critical density of an explosive charge.
• Determine the gap sensitivity of explosives.
• Measure the timing accuracy of detonators.
• Measure the continuous VOD of primers/boosters.
• Determine the minimum booster size for any explosive by measuring run-up velocities.
STOP
Persons not trained and/or authorized to handle explosives should not attempt to utilize the MicroTrap™ VOD/Data
Recorder for monitoring explosive properties.
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