HOBO Plug Load Data Logger
Professional-grade HOBO Plug Load Logger measures power and energy consumption of 120V office equipment plug loads to identify savings opportunities.

HOBO UX120 Plug Load Data Logger - UX120-018

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IMPORTANT: This HOBO data logger requires HOBOware software and a communications device. See compatible items below.

Onset's HOBO Plug Load Data Logger is a high-accuracy, easy-to-deploy data logger that measures and records the power and energy consumption of 120V plug loads from office equipment, vending machines, and other devices.

Accurate and Rugged

The UL certified logger provides 0.5% measurement accuracy with a measurement resolution of 1 watt, making it an ideal choice for building audits where detailed energy use data is required. The rugged housing is designed to withstand the rigors of real-world handling, providing reliable performance despite bumps, drops, and use under desks.

Key Advantages

  • 0.5% measurement accuracy enables more reliable plug load energy data
  • "Meter Mode" provides instant viewing of real-time plug load variables
  • Provides time-stamped and totalized load data for detailed energy analysis
  • Large memory enables faster logging intervals for more comprehensive plug load profiles
  • Battery back-up ensures logged data remains intact in the event of a power outage or load failure
  • Full-featured LCD display provides visual diagnostics for easy deployment
  • Compatible with HOBOware and HOBOware Pro software for logger setup, graphing and analysis

The UX120-018 Data Logger is for use in Indoor environments

The UX120-018 Data Logger supports the following measurements (some sensors sold separately):

AC Current, AC Voltage, Amps (A), Kilowatt Hours (kWh), Power Factor (PF), Volt-Amps (VA) See more

Onset # UX120-018
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UX120-018 Data Logger Product Video

Note: The UX120-018 logger is intended for use on 15 AMP circuits (NEMA 5-15P) with a working voltage of 120V AC ±10% at 50/60Hz and a max power of 1800W.

  • Indoor use only
  • Insulation category 2

RMS Voltage Accuracy 0.5% up to 14 Amp continuous; up to 1.0% over 14 Amp when equipment being monitored is at 100% duty cycle
RMS Current Accuracy 0.5% up to 14 Amp continuous; up to 1.0% over 14 Amp when equipment being monitored is at 100% duty cycle
Active Power Accuracy 0.5% up to 14 Amp continuous; up to 1.0% over 14 Amp when equipment being monitored is at 100% duty cycle
Active Energy Accuracy 0.5% up to 14 Amp continuous; up to 1.0% over 14 Amp when equipment being monitored is at 100% duty cycle
Power Factor Accuracy ±0.02
Drift Up to 0.5% typical within 1 year
Volts, rms 10mV
Amps, rms 0.1mA
Active Power 10mW down to 1 watt loads @ 120VAC
Apparent Power 10mVA
Power Factor 0.01 PF
Operating Environment Logging: 5° to 40°C (41° to 104°F); 0 to 95% RH (non-condensing), up to 2,000 m (6,562 ft) altitude
Operating Modes Meter or logging when launched with HOBOware
Logging Rate 1 second to 18 hours, 12 minutes, 15 seconds
Statistics Sampling Rate 60 Hz or 16.67 mS single-cycle
Memory Modes Wrap when full or stop when full
Start Modes Immediate, push button, date & time, or next interval
Stop Modes When memory full, push button, or date & time
Restart Mode Push button
Time Accuracy ±1 minute per month at 25°C (77°F), see Plot A
Power Source Line-powered with 0.92 m (3 ft) AC power cord or two AAA 1.5 V alkaline batteries, user replaceable
Battery Life 2 years with line power; 6 months battery only (no line power) with logging rate of 1 minute or greater operating at 25°C (77°F)
Memory 4 MB (1.4 million measurements, maximum)
Download Type USB 2.0 interface
Full Memory Download Time Approximately 1.5 minutes
LCD LCD is visible from 0° to 50°C (32° to 122°F); the LCD may react slowly or go blank in temperatures outside this range
Size 13.97 x 7.62 x 4.75 cm (5.5 x 3 x 1.87 in.)
Weight 230.8 g (8.14 oz)
Ratings IP50;
UL Logo UL Listed; UL Listed to Canadian safety standards
Calibration This device has been calibrated using equipment that has been tested in accordance with ANSI C12.20 0.5%. To maintain maximum accuracy, recalibration should be performed after 1 year of use to remove the accumulated drift, which could be as much as 0.5%. After initial 1-year calibration, calibration should be performed every 3 years. Contact Onset Technical Support at loggerhelp@onsetcomp.com when recalibration is required.
  Time Accuracy
Part Number
HOBOware Pro Mac/Win (USB cable included)
HOBOware Pro - Mac/Win Data Logger Software - Download Only
Part Number
Connection Cables
USB Cable
Part Number
Carrying Case
Pelican Case
Documentation for the UX120-018

17838-A-MAN-UX120-018 logo
UX120-018 Plug Load Logger Manual