DCVG/CIPS检测仪，可实现DCVG、CIPS、DCVG+CIPS、datelogger功能，具有GPS同步，中断电流器可选，便携易于操作

      To undertake an accurate close interval potential surveys requires modern state of the art equipment such as the CATH-TECH HEXCORDER Graphica or Millennium and CATH-TECH CI series of GPS synchronized current interrupters.  All rectifiers influencing the area of the pipeline to be surveyed must be synchronously interrupted to allow the accurate measurement of the rectifier ON and Instant OFF potentials.  CATH-TECH manufactures GPS current interrupters covering a range of 10 amps to 200 amps.  The current interrupters can be installed in either the AC supply to the rectifier or the DC output of the rectifier.  A sufficient number must be installed such that all rectifiers that could influence the potential of the pipeline in the area to be surveyed must be interrupted synchronously.

      In some areas, the potential of the pipeline may be affected or influenced by telluric or dynamic stray currents.  CATH-TECH has developed a GPS synchronized data logger called the "Smart Logger" which is installed in the survey area to record the rectifier ON and Instant OFF potential at each rectifier interruption cycle.  If any external source of interference is affecting the potential of the pipeline the Smart Logger will record the affect and time stamp the data the data recorded by the Smart Logger can then be used to correct the close interval survey results.  There have been several papers presented at NACE International on stray and telluric current correction of CIPS data by using GPS synchronized data loggers such as the CATH-TECH Smart logger.

      With GPS synchronized current interrupters such as the CATH-TECH CI series of current interrupters installed in all of the rectifiers influencing the survey are and with CATH-TECH Smart logger installed at the start, end and at 5 Km intervals through out the survey area, you can be assured of obtaining accurate rectifier ON and Instant OFF potentials using either the CATH-TECH HEXCORDER Graphica or Millennium. 

      Both the HEXCORDER Graphica and Millennium are equipped with GPS engines for accurate timing of the measurement of the rectifier ON and Instant OFF potentials.  Both units can also measure the distance traversed (chainage) and can display and record the Universal Co-ordinated Time as well as the latitude and longitude and elevation of each measurement location.

      Since each recorded reading is time stamped with the Universal Co-ordinated Time and if one or more smart Loggers where reinstalled in the survey area, if the data is influenced by dynamic stray or telluric currents the data from the stationary Smart Loggers can be used to correct the data recorded by the HEXCORDER's during the close interval survey.

      1、Combined CIPS and DCVG Surveys for Improved Data Correlation.zip

      2、Correcting CIPS Surveys for Stray and Telluric Current Interference.zip