Features and advantages:
One year without calibration required
Low cleaning frequency and simple maintenance
Accuracy can reach 99%
The response time of the full range is less than 30 seconds
No polarization effect time (no electrode)
Not contaminated by hydrogen sulfide, heavy metals, oil, and other chemical substances in water
One year warranty for sensors

Working principle
The sensor cover at the forefront of the measuring probe is covered with a layer of fluorescent material, which emits blue light from the LED light source
When projected onto a fluorescent substance, the fluorescent substance is excited and emits red light; A photovoltaic cell detects the time required for a fluorescent substance to return to its ground state from emitting red light. This time is only related to the emission time of blue light and the amount of oxygen. The probe also has an LED light source that emits red light while emitting blue light, serving as a reference for the emission time of blue light. The more oxygen around the sensor, the shorter the time for the fluorescent substance to emit red light. Therefore, calculate the concentration of dissolved oxygen.

TECHNICAL INDEX
Technical indicators of sensors
Measurement range: 0.00-20.00ppm,
Reproducibility: 0.05ppm
Accuracy:< ± 0.1ppm at 1ppm ± 0.2ppm at 1ppm
Sensitivity: ± 0.05% of full scale
Response time: 90% ＜ 60 seconds; 95% ＜ 90 seconds, at 20 ℃
Probe material: Noryl and 316 SS stainless steel
Sensor cap material: polybutylene synthetic rubber
Temperature range: 0.0~50 ℃
Temperature compensation: NTC 30K Ohm resistor; automatic temperature compensation
Sensor cable: standard length of 10m, with a quick disconnect plug. The additional sensor length can be increased by using junction boxes and extra cable length
Maximum distance from analyzer to sensor: 300m
Interference: Not affected by the following substances: H2S，pH，K+ ，Na+ ，Mg2+ ，Ca2+ ，NH4 + ，Al3+ ，Pb2+ ，Cd2+ ，Zn2+ ，Cr（tot），Fe2+ ，Fe3+ ，Mn2+ ，Cu2+ ，Mi2+ ，Co2+ ，CN－，NO3－，SO4 2－，S2－，PO4 3－，Cl－， Crude oil, Cl2
Sample temperature: 0-100.0 ℃
Analog output (1 and 2): 0.00-20.00mA or 4.00-20.00mA
Environmental conditions: Operation: -20-60 ℃; 0-95% relative humidity, no condensation
Storage: -30-70 ℃; 0-95% relative humidity, no condensation


Ordering Guide:
A set of LDO fluorescence method membraneless dissolved oxygen analyzer, consisting of a controller, probe, and installation components (optional).
LXV401.52.0002 SC100 Standard Controller
57900-00 HACH LDO dissolved oxygen probe with 10m cable
Optional accessories for the instrument
57911-00 replaceable sensor cap
58670-00 Cable Junction Box
57960-00 extended 7.5-meter cable
57961-00 extended 15 meter cable
57962-00 extended by 30 meters cable
57900-01 HACH LDO Explosion proof Dissolved Oxygen Probe (Class1, Div2)
Optional installation components
57944-00 Support Rod Installation Kit
57943-00 Floating Ball Installation Kit
Cleaning system
57952-00 Air Cleaning System, 230V