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HOBO 4-Channel Pulse Data Logger


A highly versatile, 4-channel energy data logger that combines the functionality of four separate loggers into one compact unit; standard memory model.

Important Information

Requires HOBOware software and a USB cable. (Note: A USB cable is included w/HOBOware Pro CD or USB software purchase). See compatible items below.

Compatible with

Product upgrade options


HOBO State Data Logger

$139.00 USD
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A highly versatile, 4-channel energy data logger that combines the functionality of four separate loggers into one compact unit. Enables energy management professionals, from energy auditors to building commissioners, to easily track building energy consumption, equipment runtimes, and water and gas flow rates. This logger has a standard memory capable of 500,000 measurements, and is also available in an expanded memory version, the HOBO UX120-017M, capable of over 4,000,000 measurements.

  • Simultaneously measures and records pulse signals, events, state changes, and runtimes
  • Stores up to over 4 million measurements, enabling longer deployments with fewer site visits
  • Maximum pulse rate – 120 Hz
  • Pulse input range – 0 to 24VDC
  • Streamlines deployment via a range of start/stop options, logger status LEDs, and high-speed USB 2.0 data offload
  • Works with Onset's Energy & Power Meter to measure Power Factor (PF), Reactive Power (VAR), Watt Hours (Wh) and more. Learn how. The T-VER-E50B2 Energy and Power Meter outputs (3) sets of pulses which are logged by the UX120-017. These pulses represent Watt-hours, Amp-hours, and VAR-hours. HOBOware software uses these pulse values to calculate AC Current, AC Voltage, kW, Power Factor, VARs, and VA. The formulas used in these calculations can be found here:
  • Compatible with HOBOware and HOBOware Pro software for logger setup and graphing & analysis
External Contact Input: Electronic solid state switch closure or logic driven digital signals to 24 V
Maximum Pulse Frequency: 120 Hz
Maximum State, Event, Runtime Frequency: 1 Hz
Bits: 4–32 bits depending on pulse rate and logging interval
Maximum Pulses Per Interval: 7,863,960 (using maximum logging rate)
Driven Logic Signal: Input Low: ≤ 0.4 V; Input High: 3 to 24 V
Absolute Maximum Rating: Maximum Voltage: 25 V DC
Minimum Voltage: -0.3 V DC
Solid State Switch Closure: Input Low: < 10 KΩ; Input High: > 500 KΩ
Internal Weak Pull-Up: 100 KΩ
Input Impedance: Solid state switch closure: 100 KΩ pull up; Driven signal: 4.5 KΩ
Minimum Pulse Width: Contact closure duration: 500 uS; Driven logic signal: 100 uS
Lockout Time: 0 to 1 second in 100 ms steps
Edge Detection: Falling edge, Schmitt Trigger buffer
Preferred Switch State: Normally open or Logic "1" state
Resolution: Pulse: 1 pulse, Runtime: 1 second, State and Event: 1 State or Event
Logging Rate: 1 second to 18 hours, 12 minutes, 15 seconds
Time Accuracy: ± 1 minute per month at 25°C (77°F) (see Plot A on next page)
Battery Type: Two AA alkaline or lithium batteries
Battery Life: 1 year, typical with logging intervals greater than 1 minute and normally open contacts
Memory: UX120-017: 520,192 measurements (assumes 8-bit)
UX120-017M: 4,124,672 measurements (assumes 8-bit)
Download Type: USB 2.0 interface
Download Time: 30 seconds for UX120-017, 1.5 minutes for UX120-017M
Operating Range: Logging: -40° to 70°C (-40° to 158°F); 0 to 95% RH (non-condensing)
Launch/Readout: 0° to 50°C (32° to 122°F) per USB specification
Weight: 149 g (5.26 oz)
Size: 11.4 x 6.3 x 3.3 cm (4.5 x 2.5 x 1.3 inches)
Environmental Rating: IP50

The CE Marking identifies this product as complying with all relevant
directives in the European Union (EU).
Compatible items

Compliance Certificates

$30.00 USD

Communication Cables

$18.00 USD


$26.00 USD

Graphing & Analysis

$75.00 USD
$99.00 USD

Kilowatt Hours (kWh)

$355.00 USD
$129.00 USD
$79.00 USD
$79.00 USD
$54.00 USD
$54.00 USD
$47.00 USD
$47.00 USD
$69.00 USD
$69.00 USD
$85.00 USD

Motor On/Off

$115.00 USD

Water Flow

$245.00 USD
What's in the box
  • HOBO UX120-017 4-Channel Pulse Input Data Logger
  • 4 mounting screws
  • 2 magnets
  • Hook & loop tape
  • 4 terminal block connectors

HOBO 4-Channel Pulse Input Data Logger (UX120-017, UX120-017M) User's Manual

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Quick Start for the HOBO® U-Series Data Logger

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