HOBO Motor On/Off Data Logger

Part # U9-004
This product is discontinued.


The HOBO U9 Motor On/Off Data Logger records motor on and off status making it ideal for energy audits and equipment monitoring. The data logger monitors the AC field generated by the motor and is easily mounted on the motor housing.

Highlighted Features

  • Internal AC magnetic field sensor monitors motor on and off conditions
  • Records up to 43,000 state changes
  • Includes mounting kit with magnet, hook and loop tape, 3/8" double-sided tape

In what environment does this data logger operate?

This data logger operates in an indoor environment.

What measurements does this data logger support?

The U9-004 data logger supports the following measurement: Motor On/Off

The country of origin for this product is the United States. To see the full specifications for this product, please see our product manual found under the documentation tab if available.

AC field threshold: 750mGauss at 60Hz

Time accuracy: Approximately ± 1 minute per month at 25°C (77°F)

Operating temperature:
Logging: -20° to 70°C (-4° to 158°F)
Launch/readout: 0° to 50°C (32° to 122°F), per USB specification

Humidity range: 0 to 95% RH, non-condensing

Battery life: 1 year typical use

Memory 64K bytes (up to 43,000 state changes)

Weight: 29 g (1.0 oz)

Dimensions: 45 x 60 x 20 mm (1.8 x 2.38 x 0.77 inches)

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

Documentation for the U9-004