Campbell Scientific OBS-3A Turbidity and Temperature Monitoring System - Manual (Page 13)

OBS-3A Turbidity and Temperature Monitoring System
5.1 Measurement Range
Turbidity (AMCO Clear): 0.4 to 4,000 NTU 1
Mud (D
50
=20 µm): 0.4 to 5,000 mg/L
Sand (D
50
=250 µm): 2 to 100,000 mg/L
Pressure 2 : 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)
1 0 to 100, 0 to 250, 0 to 500, 0 to 1000, 0 to 2000, and 0 to 4000 NTU
ranges are available.
2 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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