MEASURE OF SUSPENDED SOLID, TURBIDITY AND SLUDGE BLANKET
DIGITAL TECHNOLOGY FOR RELIABLE MEASUREMENTS
APPLICATION:
• Urban Waste water treatment (Inlet/ sewage water (SS, Turbidity), Aeration basin (SS), Outlet (Turbidity).
• Treatment of industrial effluents (Aeration basin (SS)), Clarifier (Sludge blanket), Outlet (Turbidity)
• Sludge treatment (Centrifugation)
• Dredging site (turbidity)
OPTICAL TECHNOLOGY:
The principle of measure is based on the mitigation of the Infra-Red signal in 870 nm through an optical path of 5mm. The sensor delivers measures in Suspended Solid (g/l), Turbidity (FAU) and Sludge Blanket detection in % of transmission IR. For a better precision, the optics of the sensor are regulated in temperature. For a measure of Suspended Solid, the sensor is directly calibrated on the material to be measured (sample of sludge). In Turbidimeter version the sensor delivers measures on a range 0-4000 FAU ( Formazine Attenuation Unit) and is calibrated with solutions of Formazine.
TECHNICAL DATA :
• Optical sensor based on absorptiometry
• Range of measure : SS : 0-50 g/L Sludge blanket 0-100 % Turbidity 0-4000 FAU
• Digital communication Modbus RS-485 / SDI-12
• Strong sensor
Suspended Solid measure :
Principle of measure : Optical IR (870 nm) based on IR absorption
Range of measure SS : 0-50 g/L
Turbidity : 0-4000 FAU
Sludge blanket : 0-100 %
Resolution SS : 0.01 g/L
Turbidity : 0.01 à 1 FAU
Sludge blanket : 0.01 à 0.1 %
Accuracy SS : < 10 %
Turbidity : +/- 5% (range 200-4000 FAU)
Sludge blanket : +/- 2%
Response time : < 35 secondes
Temperature measure
Principle of measure : NTC
Working temperature : -5.00 °C to + 60,00°C
Resolution : 0.01 °C
Accuracy : +/- 0.5 °C
Storage Temperature : -10°C to + 60°C
Degree of protection : IP 68
Signal Interface : Modbus RS-485 or SDI-12
Refreshment of the measure : Maximum < 1 seconde
Power supply : 5 to 28 volts
Consumption : Standby : 25 µA (5 V)
Average RS485 (1 measure/seconde) : 4.5 mA (5V)
Average SDI12 (1 measure/seconde) : 4.5 mA (5V)
Curent Pulse : 100 mA during 30 mS
Heating times : 100 ms
Sensor :
Weight : 750 g (sensor)
Material DELRIN, Nickel-plated brass, EPDM
Pressure : max. 5 bars
Cable/ connexions : 9 armoured connectors, waterproof connector.