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D-OPTO OPTICAL DISSOLVED OXYGEN TRANSMITTER
Optical dissolved oxygen sensor and optical DO analyzer
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FEATURES:
- Accurate with good long term stability
- Low maintenance, long calibration interval
- Flow insensitive technology, completely unaffected by water velocity
- Built in bio-fouling control
- No consumables - long sensor life
- Low power consumption
- Simple to integrate and operate
- SDI-12 or 4-20mA versions available
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Optical Dissolved Oxygen Transmitter Product Description
The D-Opto Optical Dissolved Oxygen Transmitter is an instrument designed for
measuring dissolved oxygen concentrations in liquids. The D-Opto Optical Dissolved Oxygen Transmitters were developed
due to the requirements of surface water monitoring programs. The optical dissolved oxygen transmitter has been specifically
designed to meet the demanding requirements of the environmental monitoring and scientific research sectors, providing long term,
accurate and reliable dissolved oxygen measurement. The Optical Dissolved Oxygen Sensor has been successfully used in
the wastewater industry for over 10 years and uses field proven solid state optical sensing technology that is highly stable over long
periods of time, even in harsh conditions. The D-Opto Optical Dissolved Oxygen Transmitter has extremely low power
requirements, and outputs the data in SDI-12 format making it ideal for incorporation into remote environmental monitoring
installations. Percent saturation values generated by the D-Opto Optical Dissolved Oxygen Sensors are the percentage
saturation that would occur if the measured liquid were saturated with air under a standard barometric pressure of 1013 mBar at the
same temperature. 4-20mA Optical Dissolved Oxygen Transmitters are available.
Methodology - Optical Dissolved Oxygen Transmitter
Unlike conventional dissolved oxygen transmitters, the D-Opto optical dissolved oxygen transmitter's sensing element utilizes
fluorescence to measure dissolved oxygen. The sensing element in the optical dissolved oxygen transmitter consists of a
fluorescing compound suspended stably in a robust optical “window”. A light source at controlled wavelength briefly pulses the
optical window. This “excites” the fluorescent material, causing it to emit a specific wavelength of light. The intensity of
this fluorescence or light is determined by the amount of dissolved oxygen in the water in contact with the optical window. A
highly stable and accurate optical sensor circuit inside the D-Opto optical dissolved oxygen transmitter measures the emitted
fluorescence. As a result, the optical dissolved oxygen transmitter provides accurate dissolved oxygen measurements over long
periods of time without the need for re-calibration.
Other Dissolved Oxygen Sensors
Traditional Galvanic and Polargraphic dissolved oxygen sensors have been used to measure dissolved oxygen in water. Galvanic
and polargraphic dissolved oxygen sensors utilize chemical electrical signatures based on a semi-permeable membrane covering
electrodes that are immersed in an electrolyte. These dissolved oxygen sensors have been poorly suited to long term reliable
and accurate monitoring of lakes, streams, and rivers. The semi-permeable membranes and electrolyte require frequent
replacement. The Galvanic and Polargraphic dissolved oxygen sensor electrodes are subject to deterioration and
“poisoning”. These dissolved oxygen sensors require constant water flow otherwise oxygen consumption occurs causing
inaccurate readings. Galvanic and Polargraphic dissolved oxygen sensors require frequent calibration resulting in high upkeep
and labor costs.
Optical Dissolved Oxygen Transmitter Advantages
Unlike conventional Galvanic and Polargraphic dissolved oxygen sensors, D-Opto optical dissolved oxygen transmitters have no
consumable components that require replacement, minimizing servicing requirments. Neither do the optical dissolved oxygen
transmitters consume oxygen. Consequently the measurement of dissolved oxygen by the optical dissolved oxygen sensor is
unaffected by water flow. The D-Opto optical dissolved oxygen transmitters can even be deployed in stagnate groundwater
bores. Because of the copper anti-biofoul ring and the general construction of the optical dissolved oxygen transmitters, they
are unaffected by pollutants and poisons and highly resilient to bio fouling. The D-Opto optical dissolved oxygen transmitters
have extremely stable electronics – a calibration interval of 1 year is typical.
The D-Opto optical dissolved oxygen transmitters can be used to monitor dissolved oxygen in almost any liquid, including wines, beer,
and milk. The optical dissolved oxygen sensors are not affected by color of the liquid. Bubbles or aeration do not affect
the optical dissolved oxygen transmitters measurements. The optical dissolved oxygen sensors can also be mounted in process
lines for quality assurance.
Global Water's PC300 Optical Dissolved Oxygen Controller can use the optical dissolved oxygen transmitter's
4-20mA output to control pumps or alarms. In addition Global Water offers the GL500 optical dissolved
oxygen recorder which adds recording capabilities to the 4-20mA optical dissolved oxygen transmitter. The GL500 optical
dissolved oxygen recorder connects to the optical dissolved oxygen sensor's 4-20mA output to record highly accurate dissolved oxygen
data.
Applications
- Long term monitoring of dissolved oxygen in streams, rivers and lakes
- Scientific research projects, both long and short term projects
- Water quality monitoring around industrial outfall
- Homeland security
- Thermocline profiling
- Fish farm and aquaculture water quality monitoring
- Wastewater industry
- Food and wine industry
Optical Dissolved Oxygen Transmitter Specifications
Output: SDI-12 or 4-20 mA (with converter)
Dissolved Oxygen
Accuracy: 1% of reading or 0.02 ppm, which ever is greater
Resolution: 0.01% Saturation, 0.001 ppm
Range: 0.00 to 25.0 ppm
Repeatability: 0.01 ppm
Response time: 90% in less than 60 seconds
Temperature: Compensated 0 to 50°C
Sensor Drift: Less than 1% per year
Temperature:
Accuracy: ±0.1°C
Resolution: 0.01°C
Range: 0 to 50°C
Depth Rating: Maximum 30m water depth
Operating Voltage: 9-15 VDC
Current Draw: 10 mA during measurement, 0.5 mA standby
Size of Transmitter: 48mm (1.89”) diameter x 156mm (6.173”) long
Transmitter Construction: Acetyl, stainless steel, cast epoxy
Weight: 1 lb.
Cable: 4 core, 20 AWG, shielded, EPDM jacket
Optical Dissolved Oxygen Transmitter Options & Prices
Prices listed are for United States and Canada only. Call or e-mail us for pricing in other countries.
Terms and Conditions
D-Opto Optical Dissolved Oxygen Transmitter - SDI-12
Includes 25 ft of cable.
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$3,370 |
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D-Opto Optical Dissolved Oxygen Transmitter - 4-20mA
Includes SDI12 to 4-20mA converter module and 25 ft of cable .
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$3,805 |
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D-OPTO-CBL Extra Cable for D-Opto Transmitter
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$19.00/ft |
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