SRi32Ηbit Digitizer

The SRi32H with the S400 fracturing sensor

LandTech introduces its new ultra high resolution digitizer/recorder unit which has been designed with the cooperation of GEObit. The technology is based on the SRi32 digitizer/recorder, initially designed for micro-cracking monitoring from the surface. Since Landtech is focusing in both PST and Fracturing Monitoring applications, the instrument has been re-designed, in order to comply with all the requirements and be able to operate with multiple ways. Special characteristics such as ultra high resolution, miniature size, ultra low power consumption (the unit can operate for one week with a small 12V/9Ah battery) combine to make the instrument the most competitive in today’s market. Our latest innovation in technology keeps LandTech several steps ahead today’s competition.

Benefits of the new instrument are:

Ultra high resolution digitizer, with effective resolution greater than 138dB@250sps and 129dB@1000sps. Up to 32 bit performance at lower sampling rates.
Fully differential variable gain analog front end which allows the connection from any simple geophone sensor up to any broad band sensor. Four control lines are provided for the seismometer’s control signals as well as for analog low resolution analog lines for the seismometer state of health monitoring.
Force balance sensor electronics for bandwidth and sensitivity extension of a 4.5Hz geophone sensor. Using this technique, provides our C100 sensor (made by ION-SM6 geophones) with a wide bandwidth range from 0.2Hz to 98Hz and ultra high sensitivity 2000V/m/sec. In parallel, the Sensor body dimensions are miniature, only 50mm diameter and 180mm length. This type of sensor has been widely used in our PST projects for years, giving excellent performance.
Selectable Sampling rate steps of 50, 100, 200, 250, 400, 500, 1000 samples per second increases flexibility.
Ability for connection of a second 3 channels digitizer, providing a compact 6-channels digitizer/recorder.
Internal Timing unit, GPS synchronized, using Digital PLL (DPLL) - TCXO - RTC unit with ultra low drift, less than 17.3usec between one hour GPS cycles. 96% of operation time, the GPS is switched off.
Miniature LCD that informs the user about instrument’s operation, with alternative messages.
Very powerful ARM type processor, running custom embedded DOS/LINUX compatible OS. Data are stored into a removable microSD Card up to 64GBytes. Semi-compressed CORE32 format, allowing data storage for months.
Ultra low total power consumption, 0.7W, and miniature size 168 X 106 X 68 mm, easily be hidden underground.
Ethernet port and communication plug-in (Seiscomp/SEEDLINK compatible) for real time telemetry applications.


The ARM processor and the microSD card	The SRi32H recorder with the C100 passive sensor


32bit digitizer noise spectrum @ 250sps	32bit digitizer signal histogram

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