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HOBO® Light On/Off Data Logger (UX90-002x) Manual 

The HOBO Light On/Off data logger monitors indoor light changes with an internal sensor. 
Using HOBOware®, you can easily configure the logger to record light on and off conditions 
making it ideal for building energy audits and light usage analysis. This compact data logger has 
a built-in LCD screen for checking status, remaining battery level, and memory consumption. 
You can also use the LCD screen to quickly calibrate the logger to the light level in your building 
or you can set calibration to preset sensitivity thresholds with HOBOware. There are two 
models of the HOBO Light On/Off data logger: the UX90-002 has 128 KB of memory while the

 

UX90-002M has 512 KB. 

 

Specifications 

Light Threshold 

> 65 lux 

Light Type 

LED, CFL, fluorescent, HID, incandescent, natural 

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 

Time Accuracy 

±1 minute per month at 25°C (77°F) (see Plot A) 

Power Source 

One 3V CR2032 lithium battery and USB cable 

Battery Life 

1 year typical use 

Memory 

UX90-002: 128 KB (84,650 measurements, maximum) 
UX90-002M: 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 5.94 x 1.52 cm (1.44 x 2.34 x 0.6 in.) 

Weight 

23 g (0.81 oz) 

Environmental Rating 

IP50 

 

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

 

 

Plot A: Time Accuracy 

 

 

HOBO Light On/Off 
Data Logger 

Models: UX90-002 

UX90-002M 

Included Items: 

 

Command™ strip 

 

Double-sided tape 

 

Hook & loop strap 

Required Items: 

 

HOBOware 3.3 or later 

 

USB cable (included with 
software) 

Accessories: 

 

Light pipe (UX90-LIGHT-
PIPE-1) 

 

U-Shuttle (U-DT-1) 

 

 

 

Office: Jl. Radin Inten II No. 62 Duren Sawit, Jakarta 13440 - Indonesia
Workshop: Jl. Pahlawan Revolusi No. 22B, Jakarta 13430 - Indonesia
Phone: 021-8690 6777 (Hunting)

Fax: 021-8690 6777

Mobile: +62 816 1740 8925

Fax: 021-8690 6771

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