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Microseismic Data Loggers for Mine Monitoring
Features
- Monitors passive geophones, pressure transducers and closure meters.
- Preamplifier and balanced line driver located with sensor.
- Sensors can be located up to 3 km from the data logger (repeaters are available to extend distance to 7 km).
- 16-bit A/D converter running at 1000 Hz per channel, autoranging A/D at gains 1 and 10.
- Systems with 8 or 16 input channels.
- Uses standard PC and A/D hardware.
- Data Logger and Transmitters NEMA 3S rated (protected from dust and splashed water).
- Low Cost.
- Complete systems, including transmitters, data logger, and software.
System Description
Systems are available for monitoring either 8 or 16 channels of data (note: 8-channel systems can be upgraded to 16 channels). Any channel can be connected to a passive geophone, a closure meter, a 4-20 mA sensor such as a pressure transducer or to a voltage output sensor. A different type of transmitter is used for each of the different sensors. The Microseismic Data Logger (MDL) is normally located within the mine at a central location where power is available. A transmitter is located close to each of the sensors to be monitored and wires (2 twisted pair cable) connect each transmitter to the MDL. No power is required at the sensor since the transmitter is powered by the MDL.
The Microseismic Data Logger contains an PC-type computer, a data acquisition card, one or two 8-channel receivers, power supplies and a thermoelectric cooler. Terminal block connections on the front panel of the MDL allow easy connection of the sensor cables from the transmitters. Connections are also provided on the bottom panel for input power, telephone line or Ethernet, video monitor, keyboard, mouse and a serial port. Power to each transmitter can be controlled using switches on the MDL front panel. LED indicators are provided to show the power status of each transmitter.