Our Products #5216478

PMD Scientific offers three extremely rugged pressurized high performance seismometer models for simplified installation
and reliable operation in small diameter boreholes:
A low noise very broad band 128 mm dia. BB603-BH
An economical broad band 83 mm dia. BB303-BH
A medium period 83 mm dia. MP403-BH.
Specifications subject to change without notice 0207
105-F West Dudleytown Road, Bloomfield, CT 06002 USA
Tel: 1-860-242-8177 Fax: 1-860-242-7812
e- mail:sales@pmdsci.com Web Site: www.pmdsci.com
Each instrument uses three identical proprietary electrochemical sensors1 mounted orthogonally
along the N, E, and Z-axes. These sensors have many advantages over traditional
electromechanical devices. In particular, they are extremely rugged and have much larger ground
motion-to-voltage conversion ratio that results in a uniquely shaped noise curve that starts bending
up at much longer periods and then raises more shallow than the traditional 1f curves. The
efficient electrodynamic force-balancing feedback provides for an extended dynamic range,
excellent stability and linearity across the entire passband.
All borehole seismometer models contain a microcontroller which maintains exceptionally accurate
parameter stability over the full operating temperature range and over the life of the instrument.
Optionally, the microcontroller can also generate internally calibrating sine or other waveform
signals. The calibration can be initiated by applying a logic level to the Calibration Enable input or
via an optional serial port. If the latter is provided, the user can also select and set the Generator
Constant value in the 350-20, 000 Vms range

The MP411 Series instruments are designed
as versatile, very rugged medium period
seismic sensors. Unlike traditional seismometers,
they are based on proprietary electrochemical
transducer technology1. These
instruments have many advantages over
conventional electromechanical sensors.
This truly convertible uniaxial seismometer, MP411, can be momentarily installed as either vertical
or horizontal sensor without requiring any readjustments. Also available is a three-channel
conventional instrument (MP413) with three identical sensors for its vertical and horizontal
components. The efficient electrodynamic force-balancing feedback provides for excellent
parameter stability and linearity.
The MP411 seismometer contains a microcontroller which maintains exceptionally accurate
parameter stability over the full operating temperature range and over the life of the instrument.
Optionally, the microcontroller can also generate internally calibrating sine or other waveform
signals. The calibration can be initiated by applying logic level to the Calibration Enable input or via
optional serial port. If the latter is provided, the user can also select and set the Generator
Constant value in the 350-20, 000 Vms range.

The PMD Scientific SD6503 Sensor
Digitizer is the essential minimum version
of the PMD 6500 family of data acquisition
products, in that it eliminates both the hard
disk and PC. When combined with a PMD,
or other seismometer, it becomes a high
resolution digital seismometer. The
digital data stream can be connected via an
RS-232 or RS-485 serial port and a digital
radio or cable link to a central data
collection computer. The large
SRAM buffer (up to 16MB) ensures reliable
data retrieval even in highly unreliable transmission conditions. The digitizer consumes
extremely low power without sacrificing its high resolution, deep antialiasing
filtering, and wide range of programmable parameters.

LNG203 is an economical high quality
tri-axial geophone aimed at a wide variety
of seismic and industrial
applications. The instrument has an
unlimited shelf life and is essentially
maintenance-free.
The geophone is exceptionally rugged.
Its output signals are velocity-flat; the
use of a dual-coil design minimizes
interference from external electromagnetic
fields.
Since the sensitivity on each primary
geophone sensor single-ended output
is very low (no better than 20Vms),
the instrument is equipped with
programmable gain low-noise
operational amplifiers that allow user to
select between 4 available sensitivities
and also convert the single-ended
output to differential thus drastically reducing
the common mode noise.
Also available are single-axis models
LNG201h and LNG201v.

This unit was designed to serve as an auxiliary device
providing user interface with the economical seismic Data Loggers Models DAS6501c and
DAS6102c. These models were introduced as economical alternatives to fully equipped seismic recorders,
DAS6501 and DAS6102 respectively. When used in seismic arrays of ten or more
autonomous stations, the c models offer significant savings since they do not contain VGA LCD
displays and weatherized keypads. Instead, the service personnel can employ a DKU6000 box that
plugs in directly into any c recorder. It takes power from the recorder and provides an effective and
convenient full PC-type user interface.
DKU6000 enclosure is a fully weatherized, rugged, unsinkable heavy duty ABS plastic box,
250x205 x124mm, with a weatherized circular connector on the back panel. It contains a compact
PC mini-keyboard and a large (25cm diagonally) LCD SVGA display. The unit weighs about 3kg.

This unique seismometer is indeed a true isotropic instrument:
it operates normally in any random orientation. It is a
member of the MP-400 Series family of instruments designed as
versatile, very rugged seismic sensors. Along with all other PMD
seismometers, these sensors are based on proprietary electrochemical
transducer technology that offers many advantages over
conventional electromechanical sensors.
Specifications subject to change without notice 0106
105-F West Dudleytown Road, Bloomfield, CT 06002 USA
Tel: 1-860-242-8177 Fax: 1-860-242-7812
e- mail:sales@pmdsci.com Web Site: www.pmdsci.com
SP400U3 is designed to work within a very wide range of supply
voltages, starting from 3Vdc. It is placed in a light high-pressure
housing made of a special aluminum alloy, submersible to
4000m.
The force-balancing feedback provides for excellent response
stability and linearity.
The latest SP400U3 seismometer contains an optional
microcontroller which maintains exceptionally accurate parameter stability over the full operating
temperature range and over the life of the instrument. Optionally, the microcontroller can generate
internally calibrating sine or other waveform signals. The calibration can be initiated by applying a logic
level to the Calibration Enable input or via an optional serial port. If the latter is provided, the user can also
select and set the Generator Constant value in the 350-20, 000 Vms range.

RSB20 is the next generation rotational
seismometer1 based on the proprietary
electrochemical transducer technology. All three
identical sensors are completely insensitive to
translational motion. In comparison with its
predecessors, this instrument is equipped with the
force-balancing magneto-hydrodynamic feedback
than not only significantly improves its linearity,
dynamic range and parameter stability but also
provides means for accurate calibration even in the
field conditions. The increase of the dynamic range
to 144dB with the simultaneous 18dB noise
reduction as compared to R-1 makes this instrument
equally suitable for scientific purposes as well as for structural monitoring; in other
words, the RSB20 picks up well both very weak and very strong rotational motions in
a much broader passband. RSB20 seismometer can be equipped with an optional
microcontroller to internally generate calibrating sine or other waveform signals. The
calibration can be initiated by applying a logic level to the Calibration Enable input or
via an optional serial port. If the latter is provided, the user can choose another option
that allows for selection the Generator Constant value in the 50-1, 000 Vrads range.
Still another option includes additional three axes of highly sensitive translational
force-balanced accelerometers providing 6 outputs covering all possible modes of
ground motion.

DAS6501 is a member of 6500 series of ultralow power, robust,
high-performance, extremely versatile 24-bit seismic
data recorders and digitizers.
Specifications subject to change without notice 0106
105-F West Dudleytown Road, Bloomfield, CT 06002 USA
Tel: 1-860-242-8177 Fax: 1-860-242-7812
e- mail:sales@pmdsci.com Web Site: www.pmdsci.com
The 6500 family of products includes: a rugged, autonomous
field system DAS6501, a strong motion data logger with builtin
(SMLA6501) or external (SML6501-xx) force-balanced accelerometers
(CLA100 or CLA200), a compact recorder for
ocean bottom applications (DAS6502), and a robust sensor
digitizer SD6503 stand-alone or built into one of the PMD
seismometers. The strength of the 6500 family lies in the efficient
combination of state-of-the art components:
A very low-power, high-performance DSP (Texas Instruments
TMS320VC5419) that controls the data acquisition,
real-time digitization and filtration, and stores the data
temporarily in the micro-power, large capacity (up to 16MB) CMOS static RAM.
A powerful, fully featured single-board PC that controls the data transfer to disk and communication
functions. It is active only when the SRAM is full, typically a few minutes every
several hours.
PMDs proprietary True Real Time system, controlled by the DSP that maintains extremely
accurate time with only occasional calls to the GPS receiver.

The CLA300 is an improved
triaxial (single-axis sensors are also available) force-balanced accelerometer that offers
low noise, high dynamic range, in a frequency band of DC to 50 Hz (optional to
500Hz). It is well suited for most strong motion monitoring applications. The CLA300
comes in three standard packaging:
An open-ended ball-bearing mounted metal plate that can be mounted internally
in the PMD SMLA6501 or SMLA6102 recorders.
A freestanding field package in NEMA4X aluminum or optional stainless steel
enclosure and MIL-spec circular connector.
A customized narrow down hole unit that includes optional digital magnetic compass:
CLA300BH package in hi-pressure stainless steel housing and underwater
marine connectors for installation in boreholes up to several hundred meters deep.
Each sensor element is housed in an epoxy sealed aluminum case. All units are extremely
rugged, and designed for long-term deployment in field or underground environments.
Unlike solid-state type accelerometers, the CLA300 does not exhibit significant
drifting with temperature changes. Options include a variety of full-scale "g" levels,
user selectable full-scale "g" ranges, and extended frequency bands.

The MP403 Series instruments
(former SP400) are designed as
versatile, very rugged broadband
seismic sensors; they are based on
proprietary electrochemical
transducer technology1. These
instruments have many advantages
over conventional electromechanical
sensors. This seismometer is
available as a three-channel
conventional instrument (MP403)
with three identical sensors for its
vertical and horizontal components
or as a convertible single-channel
instrument (MP401) which can be
momentarily installed as either
vertical or horizontal sensor. The
efficient electro-dynamic forcebalancing
feedback provides for
excellent parameter stability and
linearity.
The MP403 contains a microcontroller which maintains exceptionally accurate parameter stability over the full
operating temperature range and over the life of the instrument. The microcontroller can also generate
internally calibrating sine or other waveform signals. The calibration can be initiated by applying a logic level to
the Calibration Enable input or via an optional serial port. If the latter is provided, the user can also select and
set the Generator Constant value in the 350-20, 000 Vms range.

This extremely versatile high-resolution seismic data acquisition
system can be configured from 4 to 32 channels, all operating synchronously up to 2, 000
samples per second. The system is available in a variety of configurations:
A field version, DAS6102, with graphic VGA display and keypad, packaged in a portable, compact,
rugged, weatherproof heavy duty plastic box; mass medium: HDD or CFC.
An economical field version, DAS6102c, without display and keypad, packaged in a portable,
compact, rugged, weatherproof heavy duty plastic box; mass medium: HDD or CFC
An industrial version, SML6102, packaged in a weatherproof enclosure with or without display
and keypad.
A strong-motion accelerograph, SMLA6102, which includes internal force-balanced accelerometers
and an optional rotational seismometer to record up to all six degrees of freedom.
The system has a unique time management circuit which maintains accurate real time, and keeps
the programmable sampling rates precisely synchronous with the real time marks. Re-indexing
of data is never required. The time system does not require continuous or frequent references
to GPS to maintain accuracy. The typical GPS access interval is once every 12 - 24 hours.

This unique instrument has been developed for the US
Department of Energy for use as a wide passband
highly sensitive vibration sensor in the beam focusing
servo-system of linear super-colliders (very high energy
particle accelerators). As such this sensor has been
highly radiation hardened and designed to function
normally in extremely strong magnetic fields up to 6
Tesla.
PMD Scientific electrochemical seismic sensors are the
only among all known highly sensitive devices that can
perform adequately in such environment. The sensors
were successfully tested in high strength magnetic fields
at the Stanford Linear Accelerator Center (SLAC) and
demonstrated complete immunity to the field. Presently
several pilot seismometers are tested by the
International Linear Collider team in France where there are going to be used
when the construction of the accelerator is completed.
Each seismometer has a single component sensor which can work readily as
either horizontal or vertical with the sensitivity axis always looking along the
direction indicated by the arrow. Moreover, this sensor is essentially isotropic
i.e. it will perform equally well in any random orientation. Its extremely small
dimensions fully answer severe space limitations imposed by the linear colliders
focusing systems.

The BB603 represents the new generation of low
noise very broadband seismometers equally
suitable for vault, field and OBS (reduced power
version) applications. The sensors highly efficient
electrodynamic force-balancing feedback provides
for an extended dynamic range, excellent stability
and linearity across the entire passband.
The instrument uses three identical proprietary
electrochemical sensors1 mounted orthogonally
along the N, E, and Z-axes. These sensors have
many advantages over traditional
electromechanical devices. In particular, they
have much larger ground motion-to-voltage
conversion ratio that results in a uniquely shaped
noise curve that it starts bending up at much
longer periods and then raises more shallow than
the traditional 1f curves.
BB603 contains a microcontroller which maintains exceptionally accurate parameter
stability over the full operating temperature range and over the life of the instrument.
Optionally, the microcontroller can also generate internally calibrating sine or other
waveform signals. The calibration can be initiated by applying a logic level to the
Calibration Enable input or via an optional serial port. If the latter is provided, the
user can also select and set the Generator Constant value in the 350-20, 000 Vms
range
Similarly to other PMD seismometers, the BB603 is extremely rugged which makes
it ideal for field use. This seismometer does not require a mass lock, mass centering, or special installation
equipment or procedures. It has low power consumption, operates over a wide temperature range; it is waterproof
up to the one-meter depths, and stays operational within a wide range of installation tilts. It provides low cost of
ownership, requiring no maintenance over the life of the instrument. Three and five-year extended warranties are
available.

The BB313 instruments are designed as
extremely robust, versatile, compact, lightweight,
broadband seismic sensors. Unlike
traditional seismometers, they are based on
proprietary electrochemical technology1 that
provides many advantages over the
conventional electromechanical sensors.
Each of the three identical sensor elements in
BB313 is equipped with an efficient
electrodynamic force-balancing feedback.
BB313 is a more compact, lighter version of
our BB303 seismometer, the difference being
in a slightly higher noise at longer periods.
The instruments are offered in two
application-dependent versions. The standard
BB313-(LN) is the reduced noise version. The BB313-SM has a higher clip
level and is used for strong motion applications. Both versions have the same dynamic range, which is shifted up
by approximately 10db in the SM relatively to the standard LN version. The BB313 instruments have been
recently redesigned. Also available are a single component version BB313U, a very low power customized
lightweight, compact ocean-bottom seismometer (OBS) BB313-OBS (photo on the right above), and a narrow
(83mm diameter) borehole model BB313-BH

The MP483 seismometer is a variation of our popular MP413
family of extremely rugged, compact medium period
instruments. It is a smaller, lighter version of the MP473 model
differing from the latter only by a very slightly higher noise near
the low frequency cutoff. Similarly to all PMD seismometers,
these devices are based on proprietary electrochemical
transducer technology1 which affords them many advantages
over conventional electromechanical sensors.
This seismometer contains three identical sensors for its
vertical and horizontal components. The efficient
electrodynamic force-balancing feedback provides for excellent
parameter stability and linearity.
All MP483 seismometers contain microcontrollers which maintain exceptionally
accurate parameter stability over the full operating temperature range and over the life
of the instrument. Optionally, the microcontroller can also generate calibrating sine or
other waveform signals. The calibration can be initiated by applying a logic level to
the Calibration Enable input or via an optional serial port. If the latter is provided, the
user can also select and set the Generator Constant value in the 350-20, 000 Vms
range.

The MP413 Series instruments are designed as versatile, very rugged
broadband seismic sensors. Unlike traditional seismometers, they are
based on proprietary electrochemical transducer technology1. These
instruments have many advantages over conventional
electromechanical sensors. MP413 is a smaller, lighter version of out
popular medium period seismometers. They have characteristics almost
identical to those of the MP403 except for a very slightly higher noise
near the low frequency cutoff.
This seismometer is available as a three-channel conventional
instrument (MP413) with three identical sensors for its vertical and
horizontal components or as a convertible single-channel seismometer
(MP411) which can be momentarily installed as either vertical or
horizontal sensor. The efficient electrodynamic force-balancing
feedback provides for excellent parameter stability and linearity.
All MP413 seismometers contain microcontrollers which maintain exceptionally accurate parameter
stability over the full operating temperature range and over the life of the instruments. Optionally,
the microcontroller can also generate internally calibrating sine or other waveform signals. The
calibration can be initiated by applying a logic level to the Calibration Enable input or via an optional
serial port. If the latter is provided, the user can also select and set the Generator Constant value
in the 350-20, 000 Vms range.

The BB303 instruments are designed
as extremely robust, versatile,
broadband seismic sensors. Unlike
traditional seismometers, they are
based on proprietary electrochemical
technology1 that provides many
advantages over the conventional
electromechanical sensors. In particular,
BB303 noise curve is essentially flat
starting from about 1Hz to the low-f
cutoff. Each of the three identical
sensor elements in BB303 is equipped
with an efficient electrodynamic forcebalancing
feedback.
The instruments are offered in two
application-dependent versions. The standard BB303-(LN) is the reduced noise version. The BB303-SM has a
higher clip level and is used for strong motion applications. Both versions have the same dynamic range, which is
shifted up by approximately 10db in the SM relatively to the standard LN version. The BB303 instruments have
been recently redesigned. Also available are a single component version BB303U, a very low power customized
ocean-bottom seismometer (OBS) BB303-OBS (photo on the right above), and a narrow (83 to 128mm diameter)
borehole model BB303-BH BB313-BH.
BB303 contains a microcontroller which maintains exceptionally accurate parameter stability over the full operating
temperature range and over the life of the instrument. Optionally, the microcontroller can also generate internally
calibrating sine or other waveform signals. The calibration can be initiated by applying logic level to the Calibration
Enable input or via optional serial port. If the latter is provided, the user can also select and set the Generator
Constant value in the 350-20, 000 Vms range.