Campbell OBS-3A Manuel télécharger pdf (Page 13)

OBS-3A Turbidity and Temperature Monitoring System

5.1 Measurement Range

Turbidity (AMCO Clear): 0.4 to 4,000 NTU

Mud (D

=20 µm):

0.4 to 5,000 mg/L

Sand (D

=250 µm):

2 to 100,000 mg/L

Pressure

: 0 to 10, 20, 50, 100, or 200 m

Temperature: 0° to 35°C

Conductivity (salinity): 0 to 65 mS/cm (40 PSU, o/oo)

0 to 100, 0 to 250, 0 to 500, 0 to 1000, 0 to 2000, and 0 to 4000 NTU

ranges are available.

Range depends on pressure sensor option chosen.

5.2 Accuracy

Turbidity (AMCO Clear,

0 to 2,000 NTU): <2.0%

Mud (0.4 to 4,000 mg/L): 2.0% of reading

Sand (0.4 to 60,000 mg/L): 3.5% of reading

Pressure: ±0.5% full scale

Temperature: ±0.5°C

Conductivity: 1%

5.3 OBS Sensor

Frequency: 5 Hz

Drift over time: <2% per year

Drift over temperature: 0.05% per °C

5.4 Other Data

Maximum size sample: 2048

Sampling rate: 1 to 25 Hz

Maximum data rate: 25 Hz

Data capacity: 8 Mbytes

Maximum number

of data lines: 200,000

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Campbell OBS-3A Manuel Page 13