HOBO Dissolved Oxygen Data Logger U26-001

Includes:

• U26-001 data logger
• DO sensor cap
• Protective Guard
• Calibration Boot with sponge

Our HOBO U26 Dissolved Oxygen logger has been part of a multi-year evaluation of DO loggers and sensors by the Alliance for Coastal Technologies (ACT), and the results have been published online. This provides an un-biased report of how our U26 performs in lab and field conditions. Note that our response letter with our added recommendations is attached at the end of this report on pages 58 and 59.

Highlighted Features

• Affordable, high performance dissolved oxygen (DO) monitoring with 0.2 mg/L accuracy
• Optical DO sensor technology for long-lasting calibration with less maintenance
• HOBOware Pro’s Dissolved Oxygen Assistant software corrects for measurement drift from fouling; provides salinity-adjusted DO concentrations and percent saturation
• Optical USB interface for high-speed, reliable data offload
• Easy-to-replace DO sensor cap lasts six months

Dissolved Oxygen
	Sensor Type:	Optical
	Measurement Range:	0 to 30 mg/L
	Calibrated Range:	0 to 20 mg/L; 0 to 35°C (32 to 95°F)
	Accuracy:	± 0.2 mg/L up to 8 mg/L; ± 0.5 mg/L from 8 to 20 mg/L
	Resolution:	0.02 mg/L
	Response Time:	To 90% in less than 2 minutes
	DO Sensor Cap Life:	6 months, cap expires 7 months after initialization
Temperature
	Temperature Measurement/Operating Range:	-5 to 40°C (23 to 104°F); non-Freezing
	Temperature Accuracy:	0.2°C (0.36°F)
	Temperature Resolution:	0.02°C (0.04°F)
	Response Time:	To 90% in less than 30 minutes
Logger
	Memory:	21,700 sets of DO and temperature measurements (64 KB total memory)
	Logging Rate:	1 minute to 18 hours
	Time Accuracy:	±1 minute per month at 0 to 50°C (32 to 122°F)
	Battery:	3.6 V lithium battery; factory replaceable
	Battery Life:	3 years (at 5 minute logging)
	Download Type:	Optical
	Depth Rating:	100 m (328 ft)
	Wetted Materials:	Black Delrin®, PVC, EPDM o-rings, silicone bronze screws; rated for saltwater use
	Size:	39.6 mm diameter x 266.7 mm length (1.56 x 10.5 inches)
	Weight:	464 g (16.37 oz)
	Environmental Rating:	IP68
		The CE Marking identifies this product as complying with all relevant directives in the European Union (EU).