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XL421 HT Instruments Data Logger


The XL421 is a Data Logger from HT Instruments. Data loggers, or data recorders, collect information over time for a variety of purposes. A data logger uses internal memory and sensors to gather and document information on a 24-hour basis. Receive an accurate and comprehensive picture of the environmental conditions you’re monitoring as the device logs this information around the clock. Use data logging to measure temperature, humidity, wind speed, solar radiation, soil moisture levels, road traffic, tank levels, and a number of other elements.

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Additional Features:

  • TRMS AC current measure up to 2500A
  • Recording with sampling programmable period
  • Manual activation of recording
  • Low battery indication
  • LED indication of any operation
  • RS-232 interface
  • Data maintaining without batteries
  • Programming with software

Standard Accessories:

  • HTFLEX33DL: Integrated flexible clamp 3000A AC, 1 pcs
  • TOPVIEW2004: Windows software + cable C2004
  • VELCRO: Adhesive velcro 50x70mm
  • BORSA2000: Carrying bag
  • Batteries
  • User manual


  • C2009 : RS-232/USB adapter
  • Standards:
  • EMC 2004/108/CE Directive
  • LVD 2006/95/CE Directive

The XL421 it’s a meter of a new Data Logger family, which also included XL422, XL423 and XL424 models, that performing measure and recording of TRMS AC current up to 2500A in a generic single phase system. Its can be very useful for various applications (i.e evaluation of load consumption, verification of nominal power of transformer, etc...). Instrument is contained in a safety and practice case with a built-in flexible clamp which permits to clamp-on wide dimensions cable or bar.

Thanks to a sophisticated memory algorithm the instruments are able to record for a very long time up to about 1 year. Use is very simply thanks presence of short indication on the case instrument also. With TOPVIEW2004 Windows software, supplied with the model, its possible to downloading and analyzing all recorded data directly on PC. The high protection degree (IP65) makes the instrument reliable and suitable also under extreme condition of use.

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