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Thu, 25/04/2013 - 09:15
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Los turbidímetros son instrumentos que miden la concentración de sedimentos en suspensión en las aguas marinas. Los líquidos pueden contener materia sólida en suspensión que consiste en partículas de tamaños muy diversos.

El COO cuenta con dos: el primero se encuentra a 2m de profundidad y el segundo se esta en una estructura metálica junto a el medidor de corriente. El turbidímetro incorporado en la estructura metálica es una OBS-3 y se encuentra aproximadamente a 10 m de profundidad. OBS-3 detecta la luz dispersada entre 140 ° y 160 °

Correntimetro AWAC y turbidímetro en una estructura metálico.

 

                                             Especificaciones OBS-3

 

 

 

DINAMIC RANGE

 

0.02 – 2,000 FTU

 

OUTPUT SPAN5

MAXIMUM

 

 

0 –5 V f.s

Mud (max.)1

0.1-5,000 mg/l

Sand (max.)2

2-100,000mg/l

 

FREQUENCY RESPONSE

 

10 Hz

 

OUTPUT

IMPEDANCE

 

<300 Ohms.

 

AMBIENT LIGHT REJECTION

 

Optical filtering and synchronous detection

 

RMS NOISE

AT 0 FTU

 

 

< 50µV

 

TEMPERATURE COMPENSATION

 

Solid state temperatura transducer

 

 

 

NONLINEARITY3

Turbidity

(formazin, 0– 2,000  FTU)

 

2,0%

 

 

POWER

REQUERIMENTS

 

 

 

+6-15V/12mA

Mud

(0-4,000mg/l)

 

2,0%

Sand

(0-60,000mg/l)

 

5,0%

 

DRIFT

Time4

-3.5% per decade

 

OUTPUT FILTER

 

20Hz (-3dB)

Temperature

0.05%/ ºC

 

SUPPLY  VOLTAGE COMPLIANCE

 

250µV/V

 

WORKING  DEPTH

 

2000 meters

 

 

SETTLING TIMES

 

Power up

 

< 1s

 

25ºC Step Change in water temperatura

 

                                                                            15s

1.         Amazon River Mud, D50=10µm.

2.         Beach Sand, D50=200µm.

3.         Maximum deviation of response from a least-squares straight line, expressed as a percentage of the calibration range.

4.         The output will not drift more tan -3.5%, continuous operation, or more tan -3.5% x (duty cycle), burst operation, in the first 2,00 hours.

5.         Output span depends on adjustable gain settings.

 

El turbidimetro de profundidad 2m es un AQUAlogger 210TYT (sonda de turbidez Integral y sensor de temperatura)

 

Barcelona_ELB's second current meter at 2m depth

 

Especificaciones
Primary Sensors
Connector version, Turbidity version or Fluorimeter version
Secondary Sensors
Temperature

 
Power
Internal 3-cell Lithium Thionyl Chloride pack or bus power
Communication
USB 1.0 and RS232 or RS485
Software
Windows-based display and logging software
Sampling
1s to 256 minutes interval, with burst mode and averaging options
Data Storage
Non-volatile EEPROM or Flash
Storage Capacity
2 million readings
Logging Lifetime
Typically over one year, depending on logging regime
 
Especificaciones Generales AQUAlogger 210
 
Acquisition System
8 channel 16-bit
Inputs
2 channels 0-5V buffered; 6 channels 0-2.5V
Controls
Digital outputs to control external gain setting, etc
Communication
USB 1.1 (no power required) and RS232 or RS485
Burst Sampling
Bursts every 1 - 255 seconds or 1 - 255 minutes
Within-Burst Rate
From 1 Hz to once every 30 seconds
Burst Averaging
Bursts may be averaged to a single data value
Data Storage
Non-volatile FLASH
Storage Capacity
Nominal 2M sets ¸ number of channels enabled.
Data Retention
>10 years
Logging Lifetime
Typically 1 year
Battery
3 x 3.6V Lithium 'AA' Cell - User replaceable
Software
AQUAtalk for Windows for configuration and download or DLL for inclusion in host applications
Dimensions
300 mm (11.8") long x 60 mm (2.4") diameter
Weight
1100 g (39 oz) in air; 460 g (16 oz) in water
Attachment
Single point attachment through mounting hole
Maximum depth
1000 m standard, deeper versions on request
 
Especificaciones del Sensor 210TYT del AQUAlogger 210TYT

El sensor  210TYT  del AQUAlogger utiliza el STM Seapoint turbidímetro. El STM tiene cuatro rangos de ganancia conmutable, los cuales pueden  ser preestablecido spor el usuario o automáticamente seleccionados por el AQUAlogger para un rango dinámico máximo en condiciones de despliegue de campo.

 

Light Source Wavelength
880 nm
Scatterance Angles
15 - 150 degrees
Linearity
<2% deviation 0 - 750 FTU
Measurement Range
0.01 FTU to >750 FTU over four automatically switched gain ranges. Above 750 FTU the sensor is non-linear.
Operating Temperature
0ºC to 50ºC
Dimensions (exc connector)
225mm (8.9") long x 70mm (2.8") diameter
Temperature
Sensor Type
Thermistor
Ranges
-2-30°C standard, other ranges on request
Resolution
better than 0.0015°C
Accuracy
±0.05°C
Time Constant
max 5 seconds
 
 
 
 
 
 
 

 

 

 

 

Los datos de turbiedez son transferidos en tiempo real al COO a través de SATELLINE-1870 radio módem.

 

Referencias:

  • OBS-3 Suspended Solids & Turbidity Monitor Instruction Manual, 1991.  D & A Instrument Company.
  • Basics of optical backscatter (OBS) & turbidity, 2005. D & A Instrument Company.

  

Manuales:

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