Mini-Seis Vibration Monitor | Lee Hung Scientific Pte Ltd
  • Features


The Mini-Seis™ is the very definition of a great blast monitoring seismograph for an affordable cost.  It is ideal for all kinds of blast vibration monitoring and for most continuous vibration monitoring in bargraph mode.  Rugged, reliable and very easy to use, the Mini-Seis™ sets the standard for value in a seismograph.



The Mini-Seis is ideal for monitoring vibrations from the following sources:

  • all types of commercial blasting
  • building implosions
  • seismic exploration
  • pile driving
  • hoe ramming
  • heavy equipment
  • ordinance destruction



  • Lightweight ans easy to use
  • Includes convenient carrying case. Economical
  • Costs much less than comparable seismographs
  • Maintenance and calibration costs are also less
  • Rugged and shielded against RF inteference
  • Keypad and display for easy field setup and data review
  • External seismic and acoustic recording range, seismic and acoustic trigger level, sample rate and record duration
  • Excellent power management 
  • Rechargeable internal battery
  • Can use either AC or DC power for long term monitoring
  • Wave form (self-trigger and manual-trigger) and continuous bar graph (histogram) modes
  • Sophistocated, non-loss data compression results in small record sizes and fast data transfer





Transducer Sensitivity

The standard transducer sensitivity is termed a 2G. Recording levels can range from 0.005 ips (0.127 mmps) to 10.24 ips (260 mmps). We also offer X1, X4 and X8 geophone gains, which modifity the standard X2 gain proportionally. These are standard options. We can also do custom gains based on specific needs.


Microphone Sensitivity

The standard microphone is limited to 148 dB. We also offer a standard option 160 dB microphone. If necessary, we can supply microphones capable of recording up to 5 or even 10 psi (185 to 190 dB).


Downhole Sensor

We offer a downhole sensor package for special needs. The package is sealed and is designed to fit inside a standard PVC pipe for easy installation. The electronics are kept in a separate container.





Data Recorded                                     One (1) acoustic and three (3) seismic channels. 

Frequency Response                         Mini-Seis: 2 to 500 Hz. (-3 dB. points) at 2048 samples per second. 
                                                                  Lower sample rates reduce the high frequency response
                                                                 Mini-Seis II: 2 to 250 Hz. (-3 dB points) at 1024 samples per second. 
Seismic Sensors                                 Three component mounted velocity geophones or accelerometers,
                                                                 depending on the ordered recording ranges. 
Microphone                                           Ceramic element rated to at least 160 dB. 
Memory                                                 Solid state with all summary, setup, and recorded data retained
                                                                 with power off.
                                                                 A lithium backup battery retains data if primary power fails. 
Clock                                                      A 24 hour clock maintains the date and time accurate to within
                                                                 1 minute per month, even if primary power fails. 
Timer Mode                                           Allows an instrument to be active only during selected hours
                                                                 on a daily basis. 
Display                                                  The high contrast LCD has two lines of 40 characters to facilitate
                                                                the instrument's setup. It also allows the operator to view operating 
                                                                parameters and summary data. 
Optional Keypad                                 Contains 6 keys for entering setup data and operating commands. 
Power on Log                                       A log of the last 64 on/off cycles is kept in memory to indicate the
                                                                active monitoring periods.
                                                                If the timer is used, the log is updated each time it activates. 
Battery                                                   Internal 6 volt rechargeable. 
Operating Time                                    With a fully charged battery all models will operate from 7 to 10
                                                                 days at 1024 samples per sec. Longer times may be obtained
                                                                 using the timer mode or external power from a small solar cell 
                                                                 or automobile battery. 
External Battery Life                           A standard automobile battery will keep the internal battery at full
                                                                  charge for several months at moderate temperatures. If the external
                                                                  battery fails, the unit will continue to operate on its internal battery.
Charging                                                 An internal charging circuit allows charging with the supplied plug-in
                                                                  wall mount charger or any 10 to 15 volt DC supply.
                                                                  Power supplies for international use are available. 
Operating Temperature                      0 to 130 degrees F (-18 to 54 degrees C) 
Case                                                        Heavy gauge aluminum for effective electrical shielding and
                                                                  rugged protection. A stainless steel case is optional.
                                                                  The case is sealed allowing shallow burial. 
Size                                                          Approximately 7.5 in. x 4.5 in. x 2.5 in. 
Weight - Aluminum Case                    Approximately 3.5 lbs. (1.6 Kg.) without accessories. 
Weight - Stainless Steel                     Adds 2 lbs. (.9 Kg.) above the aluminum case weight. 
Weight - Accessories                         Approximately 6 lbs. (2.7 Kg.) including the storage case. 
Waveform Data                                    Mini-Seis: The full waveform signature is stored in solid state
                                                                  memory for up to 340 events. 
                                                                 Mini-Seis II 1/8M: Approximately 10 to 20 typical blast events. 
                                                                 Mini-Seis II 1/4M: Approximately 50 to 100 typical blast events. 
                                                                 Mini-Seis II 1/2M: Approximately 150 to 250 typical blast events. 
Summary Data                                     Summarized data include the event time, date, battery voltage,
                                                                 peak measurements, unit serial number and frequencies.
                                                                 The summarized data are stored in solid state memory
                                                                 for the last 341 events. 
Sample Rate                                         Mini-Seis: From 2048 samples per second per channel down to
                                                                 32 samples per second per channel. 
                                                                Mini-Seis II: 1024 or 512 samples per second per channel. 
Recording Units                                  English (U.S.) or metric. 
Seismic Recording Ranges             Standard (x2) 
                                                                 0.005 IPS to 2.5 IPS (0.125 to 64 MMPS) 
                                                                 0.01 IPS to 5.0 IPS (0.25 to 127 MMPS) 
                                                                 0.02 IPS to 10.0 IPS (0.50 to 254 MMPS) 
                                                                Optional (x1 - accelerometers) 
                                                                 0.01 IPS to 5.0 IPS (0.25 to 127 MMPS) 
                                                                 0.02 IPS to 10.0 IPS (0.50 to 254 MMPS) 
                                                                 0.04 IPS to 20.0 IPS (1.00 to 508 MMPS) 
                                                               Optional (x4) 
                                                                0.0025 IPS to 1.2 IPS (0.063 to 30.5 MMPS) 
                                                                0.005 IPS to 2.5 IPS (0.125 to 64 MMPS) 
                                                                0.01 IPS to 5.0 IPS (0.25 to 127 MMPS) 
                                                               Optional (x8) 
                                                                0.0013 IPS to 0.6 IPS (0.033 to 15.2 MMPS)
                                                                0.0025 IPS to 1.2 IPS (0.063 to 30.5 MMPS) 
                                                                0.005 IPS to 2.5 IPS (0.125 to 64 MMPS) 
Acoustic Ranges                                0.02 to 2.56 millibars (100 to 142 dB) 
                                                                0.04 to 5.12 millibars (106 to 148 dB). 
Trigger Levels                                    Seismic 
                                                               2.5 IPS Range - 0.01 to 0.57 IPS (0.25 to 14.5 MMPS). 
                                                               5.0 IPS Range - 0.02 to 1.14 IPS (0.5 to 29 MMPS). 
                                                              10.0 IPS Range - 0.04 to 2.28 IPS (1.0 to 58 MMPS). 
                                                              Seismic trigger sensitivities are proportionally modified by optional 
                                                              Acoustic - 106 to 142 dB or 112 to 148 dB. 
Manual Trigger                                 Allows triggering from the keyboard or by an external input. One unit 
                                                             may be used to trigger additional instruments. 
Record Duration                              Mini-Seis: From 1 to 6 seconds at a sample rate of 2048 samples 
                                                             per second.
                                                             At lower sample rates, the duration is automatically increased
                                                             proportional to the amount of decrease in the sample rate. 
                                                             Mini-Seis II: From 1 to 9 seconds at 1024 samples per second. 
Cycle Time                                         Mini-Seis: At 1024 samples per second, up to 12 seconds of data 
                                                               can be taken with only 50 milliseconds between events.
                                                              After 12 seconds of data are stored, another event cannot be
                                                              taken until the previous data have been processed.
                                                              Processing requires about 3 seconds per second of recording time. 
                                                              Mini-Seis II: Maximum continuous data time is 9 seconds. 
Records Stored                                 Up to 341 typical coal mine or quarry blast events. 
Calibration Test (Seismic)              A dynamic transducer test is performed automatically after each 
                                                               event or manually on command. The test is stored in the summarized
                                                               data and may be downloaded as an event. 
Calibration Test (Acoustic)            An electronic test of the microphone is performed with the seismic test
                                                              and is stored in memory along with the seismic test. 
84 Hour Cal Test                               In a remote installation, an automatic calibration test occurs if no event
                                                               has been recorded for 84 hours. 
RS232 Serial Port                             Data can be downloaded and setup commands can be uploaded
                                                               directly by computer or remotely by modem. 
Baud Rate                                           From 1200 to 38.4K.