Onset HOBO UX90 Motor On/Off Data Logger

The Onset HOBO UX90 motor on/off data logger records conditions within an AC magnetic field using an internal sensor, or mechanical dry contact closures from external sensing devices.

Features

  • Ideal for tracking usage and runtimes of motors, pumps and compressors.
  • Available in 128 KB and 512KB memory models
Your Price $139.00
Stock Check Availability  

Overview
The Onset HOBO UX90 motor on/off logger records motor on/off conditions within an AC magnetic field with its internal sensor, or mechanical dry contact closures from external sensing devices. Ideal for tracking the usage and runtimes of motors, pumps, compressors, and other equipment, this logger is available in a standard 128 KB memory model (UX90-004) capable of 84,650 measurements and an expanded 512KB memory version (UX90-004M) capable of over 346,795 measurements.

Internal Motor Sensor
AC Magnetic Field Threshold

>40 mGauss at 60 Hz

External Input
External Contact Input

Electronic solid state switch closure or logic driven voltage output

Range

0 to 3 V DC (USB powered), 0 to 2.5 V DC (battery powered)

Maximum State and Runtime Frequency

1 Hz

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

Logger
Resolution

Pulse: 1 pulse, Runtime: 1 second, State and Event: 1 State or Event

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

Power Source

One 3V CR2032 lithium battery and USB cable

Battery Life

1 year, typical with logging intervals greater than 1 minute and normally open contacts

Memory

UX90-004: 128 KB (84,650 measurements, maximum)

UX90-004M: 512 KB (346,795 measurements, maximum)

Download Type

USB 2.0 interface

Full Memory Download Time

10 seconds for 128 KB; 30 seconds for 512 KB

Logger Operating Range

Logging: -20° to 70°C (-4° to 158°F); 0 to 95% RH (non-condensing)

Launch/Readout: 0° to 50°C (32° to 122°F) per USB specification

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
3.66 x 8.48 x 1.52 cm (1.44 x 3.34 x 0.6 in.)
Weight
30 g (1.06 oz)
Environmental Rating

IP50

  • HOBO UX90-004x Motor On/Off Data Logger
  • Command strip
  • Double-sided tape
  • Hook & loop strap
Questions & Answers
No Questions
Did you find what you were looking for?

Select Options

  Products 0 Item Selected
Image
Part #
Description
Price
Stock
Quantity
Onset HOBO UX90 Motor On/Off Data Logger
UX90-004
HOBO UX90 motor on/off time-of-use logger (128K)
Your Price $139.00
Check Availability  
  Accessories 0 Item Selected
Notice: At least 1 product is not available to purchase online
×
Multiple Products

have been added to your cart

There are items in your cart.

Cart Subtotal: $xxx.xx

Go to Checkout

In The News

From Pans to Buoys: Advancing Reservoir Evaporation Rate Monitoring in Texas

In warmer climates like Texas, high reservoir evaporation rates can lead to declines in water level and water availability during droughts, making monitoring essential in order to ensure water security during times of scarcity. According to the Texas Water Development Board (TWDB), evaporation rates in Texas were previously based on data collected from a sparse network of Class A evaporation stations, dating back to the 1960s. These pans were stationed near reservoirs and still remain a widely accepted standardized approach to measuring evaporation rates on land. Monthly pan-to-lake coefficients were developed in the 1980s to connect the data collected from the pans to known lake conditions, extrapolating evaporation rates of the lakes using the pan data.

Read More

A Drop in the Ocean: Restoring London’s Tidal Thames

The United Kingdom has grappled with wastewater management problems for decades. Although sewage treatment in the 20th century allowed many rivers, including the tidal Thames, to have healthy fish populations, combined sewer overflows into rivers–most commonly during heavy rainfall–affected water quality and occasionally even killed fish. Problems reached a head in 2012 when multiple infractions of European urban wastewater treatment laws threatened costly fines, on top of the environmental cost of repeated sewage spills into British rivers. Fast forward to 2025, and after a decade of construction work, London’s Thames Tideway Tunnel , affectionately dubbed the “super sewer”, is now fully activated and ready for testing.

Read More

Have You Heard? AI Buoys Revolutionizing Marine Mammal Monitoring in Whangārei Harbor, New Zealand

In one history, Whangārei Harbor, nestled in the lush hills of New Zealand’s North Island, gets its name from the Māori, “waiting for the breastbone of the whale.” It seems fitting, then, that it’s now home to state-of-the-art acoustic monitoring buoys listening for marine mammals around the clock. In September 2024, a team from Auckland-based underwater acoustics firm Cetaware Ltd installed NexSens buoys in Northport, a major commercial port at the entrance to the Whangārei Harbor. The first buoys to be installed by Cetaware in a permanent setting running 24/7, they use real-time artificial intelligence (AI) models to passively sense Delphinidae–from common dolphins to orcas. Dr.

Read More