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Hach LDO® Dissolved Oxygen Sensor

Since 2002, Hach has established itself as the premier provider of luminescent dissolved oxygen (LDO) technology.  Only Hydrolab multiparameter 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.

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  • Hach LDO technology with significant advantage over Clark cell DO sensors
  • No membranes, so concerns about air bubbles, 24-hour membrane relaxation, and the art of maintenance are a thing of the past
  • Calibrations with low drift, means that deployments will last longer, reducing frequency of trips to the field for maintenance
  • Does not consume oxygen so passive fouling will not affect DO readings
HACH LDO² SENSOR Firmware Update How to - Hydras3 LT
HACH LDO² SENSOR VERSION 2.70
HACH LDO² SENSOR VERSION 2.80
HACH LDO² SENSOR VERSION 2.90
HACH LDO² SENSOR VERSION 2.92
HACH LDO² SENSOR VERSION 2.93
HACH LDO² SENSOR VERSION 2.94
HACH LDO² SENSOR VERSION 2.95
HACH LDO² SENSOR VERSION 2.96
HACH LDO² SENSOR VERSION 2.97
HACH LDO² SENSOR VERSION 2.98
HACH LDO² SENSOR VERSION 2.99
HACH LDO² SENSOR VERSION 3.00
HACH LDO² SENSOR VERSION 3.01
HACH LDO² SENSOR VERSION 3.02
HACH LDO² SENSOR VERSION 3.03
HACH LDO² SENSOR VERSION 3.04
HACH LDO² SENSOR VERSION 3.05
HACH LDO² SENSOR VERSION 3.06
HACH LDO² SENSOR VERSION 3.07
HACH LDO² SENSOR VERSION 3.08
HACH LDO² SENSOR VERSION 3.09
HACH LDO² SENSOR VERSION 3.10
HACH LDO² SENSOR VERSION 3.11
HACH LDO² SENSOR VERSION 3.12
HACH LDO² SENSOR VERSION 3.13
HACH LDO² SENSOR VERSION 3.14
HACH LDO² SENSOR VERSION 3.15
HACH LDO² SENSOR VERSION 3.16
HACH LDO² SENSOR VERSION 3.17
HACH LDO² SENSOR VERSION 3.18
HACH LDO² SENSOR VERSION 3.19
HACH LDO² SENSOR VERSION 3.20
HACH LDO² SENSOR VERSION 3.21
HACH LDO² SENSOR VERSION 3.22
HACH LDO² SENSOR VERSION 3.23
HACH LDO² SENSOR VERSION 3.24
HACH LDO² SENSOR VERSION 3.25
HACH LDO² SENSOR VERSION 3.26
HACH LDO² SENSOR VERSION 3.27
LDO White Paper
Video - LDO Sensor Calibration - EN
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Hach LDO Sensor
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
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Question 1

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