TURBIBUOYTURBIDITY MONITORING BUOY |
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Turbibuoy is designed for sheltered water operations to typically 50m depth and can be either permanent or temporary platforms. The system is designed to monitor record and display turbidity data in support of water quality monitoring or dredge monitoring operations. One or two sensors may be deployed at differing depths. Turbidity is an ideal surrogate for simple assessment of general water quality and effects of sediment disturbance by dredging and other civil engineering projects. The TURBIBUOY system allows users to enter their own calibration curve to convert NTU to mg/L. Users may also designate one buoy as "upstream" the other as "downstream" so that alarms can be triggered dynamically based upon the background field data rather than a fixed NTU/Mg/L value. Turbibuoy is most often deployed as a surface buoy but can equally be installed on fixed structures, piles, piers and jetties. The system acquires and sends data directly from the point of measurement to the internet via GPRS where data may be viewed monitored and controlled via a simple web interface. This means that expensive infrastructure and hardware ashore is eliminated and data can be viewed from any where in the world with internet access including smart phones etc. Data may be sent by email automatically each day or on demand for offline processing and alarms can be sent by both email and SMS text. Position is monitored using on board GPS and watch circle radius can be set by the user. Turbibuoy is also available in the minibuoy format for harbour, lake and river use. |
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The system uses the Analite NEP-395 turbidity sensor. These sensors have advanced attributes that make them ideal for this application. Sensors are fitted with lens wipers to minimise effects of bio fouling and have advanced signal processing algorithms to minimise the effects of transient increases due to fish, stones, or other unusual events. Measurements are auto ranged up to 1000 NTU (5000NTU to special order) and data are averaged over 100 discrete samples which themselves are pre-averaged. Data are presented as the average value as well as the maximum, minimum and variance to allow users to see how hard the sensor is working to provide accurate results. The system can also accommodate WET Labs ECO series turbidity and back scatter sensors and the YSI 600 OMS single sensor turbidity probe.
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SPECIFICATIONS:Turbidity sensor (Analite NEP-395) Technique 90° Infra-Red (ISO7027). Range 40, 100, 400 and 1,000 NTU – Auto set Resolution Digital 40NTU ±0.01NTU 100NTU ±0.02NTU 400NTU ±0.1NTU 1,000NTU ±0.2NTU 5000NTU to special order Repeatability ±1% at 25°C. Linearity <1% for 40NTU, 100NTU and 400NTU, 3% for 1,000NTU. (using 3 point cal) Output RS232 1200 Baud 7 data even parity 1 stop All models: Measurements Mean and Sample Variance (over 100 samples) Median (over 100 samples) Minimum (over 100 samples) Maximum (over 100 samples) Calibration 2 or 3 point calibration for each range may be set by the user only through the RS232 Power 9.6 - 16V dc, 1.5mA OFF, 35mA ON. 60mA ON and wiping (NEP395 only). Wipe Time 6 seconds nominal. Weight NEP390P Plastic 300gms NEP395S Steel 350gms 70g/m for cable Depth Rating 50m (plastic) Operating Temp. -10°C to 40°C. Storage Temp. -20°C to 50°C.
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DB buoys,
robust even when in a collision. Deployed in Antigua, and shortly after the buoys were in place one of them was in a collision with a boat, subject to repeated propeller hits, causing considerable surface damage to the buoy. However, due to its
robust design, lightweight material and its polyurethane foam filling,
the buoy is still floating. In addition the collision did minimal damage
to the boat!
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