Since 2002, Hach has established itself as the premier provider of luminescent dissolved oxygen (LDO) technology, and only Hydrolab Series 5 sondes feature Hach LDO technology – designed, manufactured, and supported by Hach in Loveland, Colorado. Now in its second generation, the Hach LDO sensor for Hydrolab sondes is better than ever. 

• No membranes
• Calibrations that last
• Superior accuracy
• Compact housing allow complete integration into any sonde – DS5X, DS5, or even MS5
• No glue, exposed fasteners, metal, seams, or moving parts

• No membranes so concerns about air bubbles, 24-hour membrane relaxation, and the art of maintenance are a thing of the past
• Calibrations that last without drift means that deployments will last longer, reducing frequency of trips to the field for maintenance, saving you time and money
• Does not consume oxygen so passive fouling will not affect DO readings
• Best accuracy because solid, defendable data is the ultimate goal
• Designed, manufactured, and supported by Hach Hydromet, the experts in LDO technology
• Robust design for long-lasting performance

Range: 
0 - 60* mg/L
* Exceeds Maximum Natural Concentrations

Accuracy:
+/- 0.1 mg/L at <8 mg/L
+/- 0.2 mg/L at >8 mg/L
+/- 10% reading >20 mg/L

Resolution:
0.01 mg/L