Hach Company - LDO
Manufactured by Hach Company
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BREAKTHROUGH LUMINESCENT TECHNOLOGY FOR DISSOLVED OXYGEN
The Hach LDO® sensor is coated with a luminescent material. Blue light from an LED is transmitted to the sensor surface. The blue light excites the luminescent material. As the luminescent material relaxes it emits red light. The time from when the blue light was sent and the red light is emitted is measured. The more oxygen that is present, the shorter the time it takes for the red light to be emitted. This time is measured and correlated to the oxygen concentration. Between the flashes of blue light a red LED is flashed on the sensor and used as an internal reference, essentially validating each measurement.
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Features of LDO
- Meets IP-67 requirements and survives 1-meter drop test onto concrete
- One-hand operation with simple menus and large, clear, backlit display
- Automated data logging records 500 measurements at user-defined durations—set the time-interval, leave the unit, and take care of something else while it logs the data for you
- Unlimited measurements can be recorded using the RS232 connection to a PC or printer
- User and sample IDs can be entered, and are attached to the analysis record
- Measurements are automatically corrected for barometric pressure, salinity, and temperature
- Results displayed as percent saturation or concentration in mg/L
- HQ20 features dual mode screen—view DO and pH/mV readings simultaneously
General Specifications
| Weight | 0.86 lbs (net) |
Additional Specifications
Probe Materials: Polycarbonate/ABS blend
Sensor Materials: Polymethyl methacrolate (Acrylic)
Temperature Sensor: 30K Ohm Thermistor
Temperature Compensation: Automatic (32 to 122°F, 0 to 50°C)
Pressure Compensation: Automatic (400 to 1100 mBar)
Salinity Correction: Automatic (0 to 70‰)
Dissolved Oxygen Measurement: 0.01 to 20.00 mg/L (ppm); 0 to 200% saturation
Temperature Measurement: 32 to 122°F (0.0 to 50°C)
Pressure Measurement: 400 to 1100 mBar
Detection Limit: 0.01 mg/L (ppm), estimated
Measuring Principle: Luminescence decay rate
Meter Dimensions: 21.2 x 8.7 x 4.2 cm (8.35 x 3.43 x 1.65 inches)