Onset UX120-018 Operating Manual

HOBO® Plug Load Logger (UX120-018) Manual

The HOBO Plug Load logger is designed to monitor energy consumption of AC-powered plug in
loads. This compact device can be used as a power meter with its built-in LCD for real-time
energy monitoring or as a data logger that can record up to 1.4 million measurements for
analysis. With the ability to view or log true RMS voltage (V), true RMS current (A), active
power (W), active energy (Wh), apparent power (VA), and power factor (PF), the HOBO Plug
Load logger provides you with an accurate log of your energy consumption of plug loads. Using
HOBOware®, you can also easily configure the logger to calculate minimum, maximum, and
average statistics during logging at a fixed sampling rate of 16.67 mS.

Specifications

HOBO Plug Load Logger

UX120-018

Included Item:

• AC power cord

Required Items:

• HOBOware 3.7 or later

• USB cable (included with

software)

RMS Voltage Accuracy 0.5% up to 14 Amp continuous; up to 1.0% over 14 Amp when equipment

Resolution 10 mV

RMS Current Accuracy 0.5% up to 14 Amp continuous; up to 1.0% over 14 Amp when equipment

Resolution 0.1 mA

Active Power Accuracy 0.5% up to 14 Amp continuous; up to 1.0% over 14 Amp when equipment

Resolution 10 mW down to 1 Watt loads at 120 V AC

Active Energy Accuracy 0.5% up to 14 Amp continuous; up to 1.0% over 14 Amp when equipment

Resolution 10 mVA

Power Factor Accuracy ±0.02

Resolution 0.01 PF

Drift Up to 0.5% typical within 1 year

Operating Environment Logging: 5° to 40°C (41° to 104°F); 0 to 95% RH (non-condensing), up to

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

Battery Life 2 years with line power; 6 months battery only (no line power) with logging

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

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 Listed; UL Listed to Canadian safety standards

Calibration This device has been calibrated using equipment that has been tested in

being monitored is at 100% duty cycle

being monitored is at 100% duty cycle

being monitored is at 100% duty cycle

being monitored is at 100% duty cycle

2,000 m (6,562 ft) altitude

batteries, user replaceable

rate of 1 minute or greater operating at 25°C (77°F)

blank in temperatures outside this range

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 [e-mail]
when recalibration is required.

17838-C MAN-UX120-018

HOBO Plug Load Logger (UX120-018) Manual

Specifications (continued)

Plot A: Time Accuracy

Logger Components and Operation

Socket

Start/Stop Button: When in logging mode, press this button for
3 seconds to start or stop logging data, or to resume logging at
the next even interval. This requires configuring the logger in
HOBOware with a push button start or stop, and with “Resume
logging on next button push” selected (see Setting up the
Logger to Record Data). You can also press this button for
1 second to record an internal event during logging (see
Recording Internal Logger Events) or to turn the LCD screen on
if the option to turn off the LCD has been enabled (see Setting
up the Logger to Record Data).

Next/Clear Button: When in meter mode, press this button for
1 second to switch between screens to view the current power
draw and a cumulative count of watt-hours (see Using the
Logger as a Power Meter). You can also press and hold this
button for 3 seconds to reset the watt-hours counter. When in
logging mode, press this button for 1 second to see current
values on all configured channels and cycle through any
enabled statistics or press and hold this button for 3 seconds to
reset the statistics on the LCD screen only (see Statistics
Logging).

AC Power Connector: Plug the AC power adapter into this
connector and then plug the logger into an outlet.

USB Port: Use this port to connect the logger to the computer
via USB cable for launching and reading out (see Setting up the
Logger to Record Data and Reading Out the Logger).

LCD Screen

USB Port

Start/Stop Button

AC Power

Connector

Next/Clear
Button

Socket: Plug the power cord for the load you want to monitor
into the socket on the left side of the logger (not visible in the
diagram).

LCD Screen: The logger is equipped with an LCD screen that can
be used in both meter and logging mode. This example shows
all symbols illuminated on the LCD screen followed by
definitions of each symbol in the table.

LCD Symbol Description

The battery indicator shows the approximate
battery power remaining.

The logger is waiting to be launched. Press and
hold the Start/Stop button for 3 seconds to launch
the logger.

The logger has been launched with push button
stop enabled; press and hold the Start/Stop
button for 3 seconds to stop the logger. Note: If
you also launched the logger with a push button
start, this symbol will not appear on the display for
30 seconds.

A device is connected to the AC line.

This shows which button to press to switch to the
next screen when in meter mode or to cycle
through the enabled channels and statistics when
in logging mode.

When the logger is in meter mode, press and hold
this button for 3 seconds to reset the watt-hour
counter (see Using the Logger as a Power Meter).
The watt-hour counter cannot be cleared when
the logger is in logging mode. When the logger is
in logging mode, press and hold this button for 3
seconds to reset the statistics shown on the LCD
screen only (see Statistics Logging).

The logger has been configured to stop logging
when memory fills. The memory bar indicates the
approximate space remaining in the logger to
record data. When first launched, all five segments
in the bar will be empty. In this example, the
logger memory is almost full (only one segment in
the memory bar is empty).

The logger has been configured to never stop
logging (wrapping). The logger will continue
recording data indefinitely, with newest data
overwriting the oldest data. When first launched,
all five segments in the memory bar will be empty.
In this example, the memory is full (all five
segments are filled in) and new data is now
overwriting the oldest data. This will continue until
the logger is stopped or the battery runs out.

This shows which screen is currently in view on the
logger; in this example, the first screen is
displayed. RMS voltage, RMS current, active
power, and active energy are displayed on the first
screen while apparent power and power factor are
shown on the second screen (all measurements

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