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HOBO® State Data Logger (UX90-001x) Manual 

15430-A MAN-UX90-001 

The HOBO State/Pulse/Event/Runtime data logger records state changes, electronic pulses and 
mechanical or electrical contact closures from external sensing devices. Using HOBOware®, you 
can easily configure the internal magnetic reed switch or the external sensor to monitor and 
record data in a wide variety of applications, such as energy consumption, mechanical  
equipment operation, and water and gas flow. This compact data logger also has a built-in LCD 
screen to monitor logging status, battery use, and memory consumption. There are two models  
of the HOBO state logger: the UX90-001 has 128 KB of memory while the UX90-001M has 512 KB. 

Specifications 

Internal Sensor 

 

Maximum State, Event, 
Runtime Frequency 

1 Hz 

Preferred Switch State 

No magnet present (normally open) 

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 Pulse Frequency 

50 Hz 

Maximum State, Event, 
Runtime Frequency 

1 Hz 

Pulse, Event Lockout Time 

0 to 1 second in 100 ms steps 

Solid State Switch Closure 

Input Low: < 10 K

; Input High: > 500 K

 

Internal Weak Pull-Up 

100 K

 

Input Impedance 

Solid state switch closure: 100 K

 pull up 

Logger 

 

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) 

Battery Life 

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

Memory 

UX90-001: 128 KB (84,650 measurements, maximum) 
UX90-001M: 512 KB (346,795 measurements, maximum) 

Download Type 

USB 2.0 interface 

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). 

 

 

 

HOBO State Data Logger 

Models: UX90-001 

UX90-001M 

Included Items: 

2.5 mm input cable 

Command™ strip 

Double-sided tape 

Hook & loop strap 

Magnet with 2 screws 

Required Items: 

HOBOware 3.3 or later 

USB cable (included with 
software) 

Accessories: 

Wattnode kWh transducers 

Power & Energy Meter  
(T-VER-E50B2) 

Water Flow Meter Sensor 
(T-MINOL-130) 

U-Shuttle (U-DT-1) 

Additional sensors and 
accessories available at 
www.onsetcomp.com. 

 

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