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We offer a complete product range of HIGH PERFORMANCE RUGGED BOREHOLE SEISMOMETERS, ROBUST MEDIUM PERIOD UNIAXIAL CONVERTIBLE SEISMOMETERS, PMD Scientific SD6503 Sensor Digitizer, LOW NOISE TRIAXIAL GEOPHONE and COMPACT EXTERNAL DISPLAY KEYBOARD UNIT

HIGH PERFORMANCE RUGGED BOREHOLE SEISMOMETERS

  • SERIES BB603-BH
  • diameter 128 mm

PMD Scientific offers three extremely rugged pressurized high performance seismometer models for simplified installation and reliable operation in small diameter boreholes: ƒ A low noise very broad band 128 mm dia. BB603-BH ƒ An economical broad band 83 mm dia. BB303-BH ƒ 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

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ROBUST MEDIUM PERIOD UNIAXIAL CONVERTIBLE SEISMOMETERS

  • SERIES MP411
  • Dimensions 330x100x110 mm

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.

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PMD Scientific SD6503 Sensor Digitizer

  • SERIES SD6503

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.

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LOW NOISE TRIAXIAL GEOPHONE

  • SERIES LNG203
  • diameter 110 х 150

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.

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COMPACT EXTERNAL DISPLAY KEYBOARD UNIT

  • SERIES DKU6000
  • DIMENSSION 250x205 x124mm

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.

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ISOTROPIC TRIAXIAL ROBUST FORCE-BALANCED SEISMOMETERS

  • SERIES SP400U3
  • Temperature range -12 to + 55 ° C

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.

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ROTATIONAL FORCEBALANCED BROADBAND LOW-NOISE SEISMOMETER

  • SERIES RSB20
  • Dimensions 160x160x160 mm

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.

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ULTRALOW POWER ROBUST 24-BIT FIELD SEISMIC DATA LOGGER

  • SERIES DAS6501

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 Instrument’s 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. • PMD’s proprietary True Real Time™ system, controlled by the DSP that maintains extremely accurate time with only occasional calls to the GPS receiver.

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Triaxial Force Balanced Accelerometers

  • SERIES CLA300

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.

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ROBUST MEDIUM PERIOD SEISMOMETERS

  • SERIES MP403
  • diameter 200 mm
  • Dynamic Range 142 dB

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.

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high-resolution seismic data acquisition system

  • SERIES DAS6102
  • Temperatures: +5 to + 60

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.

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PMD Scientific electrochemical seismic sensors

  • SERIES LC501
  • Dimensions 50 x 100 x 150 mm

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.

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HIGH PERFORMANCE BROAD BAND SEISMOMETERS

  • SERIES BB603
  • diameter 200 mm

The BB603 represents the new generation of low noise very broadband seismometers equally suitable for vault, field and OBS (reduced power version) applications. The sensor’s 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.

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ROBUST COMPACT ECONOMICAL BROADBAND SEISMOMETERS

  • SERIES BB313
  • diameter 155 mm

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

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COMPACT ROBUST MEDIUM PERIOD REDUCED NOISE SEISMOMETERS

  • SERIES MP483
  • diameter 155 mm

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.

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COMPACT ROBUST MEDIUM PERIOD SEISMOMETERS

  • Series MP413
  • Dynamic Range 142 dB
  • diameter 155 mm

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.

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ROBUST ECONOMICAL BROADBAND SEISMOMETERS

  • SERIES BB303
  • diameter 200 mm

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.

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