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uDL2 corTalk data logger

The uDL2 is a high accuracy, two channel data logger designed for use with CP coupons.


The uDL2 is a high accuracy, two channel data logger designed for use with CP coupons. An integral current detector with interruption relay allow direct measurement of coupon AC current density and coupon DC current. A reference cell input provides DC potential, AC voltage and Instant-disconnect DC potential measurements. A large LCD can be used to locally verify the readings. Measurement storage capacity of 2,000,000 readings and rechargeable battery allow the device to capture readings for over 4 months. An internal GPS receiver provides an accurate time reference and site geo-location coordinates.

uDL2 Micro Data Logger for CP Coupons – Two channel data logger with internal GPS, 2,000,000 measurement memory, internal current shunt and interruption relay. Includes USB cable, analog cable with banana jacks & alligator clips, USB drive with PC software, fabric carrying case and 1 year factory warranty. 

Positioned inside a CP test station

Data Preview Graph


  • Operation in -20 to +60°C (-4 to +140°F)
  • High measurement accuracy over -20 to +60°C (-4 to +140°F)
  • Can measure AC and DC simultaneously
  • Integral rechargeable battery provides over 4 months or 2,000,000 readings per charge
  • Water resistant (non-submersible) enclosure for harsh environments
  • Lightning and surge protected
  • Measures AC current density, coupon DC current, coupon DC potential, coupon AC voltage, instant-disconnect DC potential and depolarized coupon DC potential
  • Very small size 89mm x 40mm x 18mm (3.5" x 1.6" x 0.72") allows for use with most standard CP test stations
  • Water-resistant (non-submersible) enclosure for harsh environments
  • Wide operating temperature range -20°C to +60°C (-4°F to +140°F)
  • Integral rechargeable battery provides over 4 months or 2,000,000 readings per charge
  • 3½ digital wide-temperature LCD for local voltage monitoring
  • Automatically powers on when measurement cable is connected
  • Two bi-polar analog inputs connect to a coupon and reference cell
  • Coupon DC current measurement ranges ±60mA & ±300mA
  • Coupon AC current measurement rages 40mA & 200mA True RMS
  • Automatic shunt disconnect when overcurrent is detected
  • >20MOhms P/S input for for direct connection to a reference cell
  • Reference cell measurement ±22VDC & 15VAC True RMS
  • Can measure AC and DC simultaneously
  • DC measurements have >65dB of 50/60Hz AC rejection for stable and accurate readings
  • High measurement accuracy over -20°C to +60°C (-4°F to +140°F)
  • Lightning and surge protected
  • Configurable instant-disconnect measurement delay
  • Configurable coupon depolarization time
  • Can measure and log internal temperature
  • Non-volatile 2,000,000 measurement storage memory
  • All measurements are time and date stamped
  • User configurable sample rate from 1 per second to 1 per 12 hours
  • USB conenction to PC laptop for configuration, data uploading and battery charging
  • Easy device configuration and data uploading through a PC-based graphical user interface
  • PC chart graphical preview of logged data
  • Comma Separated Value (CSV) data file export
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