LDO Dissolved oxygen probe

Principle of Operation:

The LDO® II dissolved oxygen sensor is based on the principle of fluorescence quenching. Blue light is directed onto a fluorescent material, exciting it to emit red light. Because oxygen molecules can carry away energy, the time and intensity of the excited red light are inversely proportional to the concentration of oxygen molecules. The dissolved oxygen meter measures the phase difference between the excited red light and a reference light, and compares it with an internal calibration value to calculate the oxygen molecule concentration.

Typical Applications:

The LDO® II dissolved oxygen sensor is suitable for dissolved oxygen measurement in municipal wastewater, industrial water, drinking water, and other industries.

Features and Benefits:

• No calibration required

•  The LDO® II dissolved oxygen sensor is calibrated at the factory and is ready to use out of the box with no calibration required. The fluorescence cap has a service life of up to two years.

• No membrane replacement required

• Featuring HACH's breakthrough fluorescence technology, this dissolved oxygen sensor requires virtually no maintenance, as there is no need to replace membranes, replenish electrolyte solution, or polish and clean the anode and cathode.

• No missed service

• This dissolved oxygen sensor features a customizable cleaning service reminder function that automatically triggers a service reminder message when due during dissolved oxygen measurement, alerting the user to clean the dissolved oxygen sensor and ensuring no cleaning cycle is missed.

• No drift

• The groundbreaking 3D calibration technology ensures that the LDO® II dissolved oxygen sensor is accurately calibrated at the factory, making dissolved oxygen measurement more accurate than ever before!

• More rugged

• The LDO® II dissolved oxygen sensor housing uses new materials while incorporating dual O-ring and ultrasonic sealing, providing corrosion resistance and water ingress protection for improved durability. The probe size has also been reduced, making dissolved oxygen measurement simpler and more suitable for harsh environments such as municipal wastewater and industrial wastewater.

Specifications

• Measuring range                           0 ~ 20.00 ppm

•                                         0 ~ 20.0 mg/L

•                                         0 ~200% saturation

• Sensor immersion depth                Pressure limit: 34 m, 345 kPa (112 ft), 345 kPa (50 psi);

• Measuring accuracy                          ±0.1 ppm below 5 ppm

•                                         ±0.2 ppm above 5 ppm

•                                         Temperature: ±0.2°C

• Transmission distance                          Up to 1000 m (3280 ft) with junction box

• Response time                          At 20ºC:

•                                        95% within approximately 60 seconds

•                                        90% within approximately 40 seconds

• Cable length                         10 m

• Resolution                            0.01 ppm (mg/L) / 0.1% saturation

• Wetted materials                        Fluorescence cap: acrylic resin. Probe body: CPVC, polyurethane, Viton, Noryl, 316 stainless steel

• Repeatability                           ±0.1 ppm (mg/L)

• Dimensions                              Diameter x length: 49.53 x 255.27 mm (1.95 x 10.05 in)

• Operating temperature                      0 to 50°C (32 to 122°F)

• Weight                            1 kg (2.2 lb)

• Flow rate                            Not required

Ordering Guide

• 9020000SLU                            LDO® II probe, 10 m cable

• 9020000-UPGRADE                LDO® II probe with conversion adapter

• 9020000-SC200                      LDO® II probe with conversion adapter, dual-channel SC200 controller

Source: Public information from the HACH Water Quality website