PERMFILE107445

• Permit No: C1989074
• IBM Index Class Name: Permit File
• Doc Date: 12/11/2001
• Section_Exhibit Name: 4.08 Use of Explosives
• Media Type: D
• Archive: No

vibra-tech
EVERLERT II SPECIFICATIONS
additional EVERLERT II instruments, or simply plugged in and operated as a
stand-alone printer. In this way, events may be retrieved from disk and printed at
the operator's convenience to create "hard-copy" seismic reports as required.
Calibration is traceable to the National Bureau of Standards. Calibration
information is stored on the disk along with the event data, and time of instrument
switch on and switch off is also recorded, even if no events take place.
A "bare-bones" version of the EVERLERT 11 is available for those who are
confident that they will never need full computer analysis or permanent data
storage. This model does not have a disk drive, and therefore, with no memory
storage capability it must always be equipped with a printer. It will simply
provide immediate post-event analysis printouts.
The detailed specifications of the EVERLERT II are as follows:
Parameters: Orthogonal tri-axial velocity transducers, for particle
velocity measurements. Also derivable are values for
displacement and acceleration.
Measurement Units: Metric: Millimetres per second and Pa/dBL.
Imperial: Inches per second and PSI/dBL.
Sample Rate: 4096 samples per second. (1024 per second per channel)
Frequency Range: Ground: 2-200 Hz., Air: 5-200 Hz.
Dynamic Range: Ground: 0.01-8.0 ins/sec., or, metric, 0.25-203 mm/sec.
Air: 100-160 dBL.
Trigger Levels: Ground: 0.01, 0.02, 0.05, 0.1, 0.2, 0.5 8 1.0 ips.
or: 0.25, 0.51, 1.3, 2.5, 5.0, 13.0, 25.0 mm/s.
Air: None, 110, 115, 120, 125, 130 dBL.
Data Storage: 1.44 MB, 3.5" Micro-disk, stores 75-100 typical events.
(Disk drive provides capability of downloading computer
programs for other blast vibration analysis techniques)
Power: 12V DC internal rechargeable battery, together with
external power supply and charger unit for operation
from 115V AC.
Real-time clock: Nith calendar, date and time stored on each event data.
Weight: 301bs (13kg) w/o printer, 321bs (14 kg.) w/printer.
Dimensions: 17" x 15" x 8," (44cm. x 38cm, x 21 cm.)
For further information on the EVERLERT 11 digital blasting seismograph, and for
detailed price quotations and availability, please contact:
Vibra-Tech Engineers, Inc., Telephone:(Area Code:303)429-1996
Westminster, Colorado. FAX: [phone]
July 10, 1989. 3-3
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