ASM-IV Turbidity Profiler

Measuring section: 0.96 m (Type S), 1.44 m (Type N), 1.92 m (Type L)

Measuring method: optical

Sensors: back scatter infrared sensors (850 nm)

Sensor distance: 10 mm

Number of sensors: 100 per meter

50 ~ 2,000 FTU

500 ~ 50,000 mg/l sand (d50 = 250 µm)

100 ~ 5,000 mg/l mud (d50 = 20 µm)

Resolution: 5 %

Accuracy: +/-10 %

Measuring method: gravimetric

Sensors: 2-D integrated circuit

Measuring range: 0 ~ 60° all directions

Resolution: 1°

Accuracy: +/- 1°

Measuring method: piezoelectric

Sensors: stainless steel pressure housing & membrane

Measuring range: 0 ~ 5,000 hPa abs.

Resolution: 0.5 %

Accuracy: +/- 0.3 % (full range)

Measuring method: resitive

Sensors: silicon integrated circuit

Measuring range: -10 ~ 45 °C

Resolution: 1 °C

Accuracy: +/- 0.5 °C

Capacity: 8 MB standard

Minimum frequency: 1 Hz

Measuring intervals: 1 sec ~ no limit

Sampling rate: 1 ~ 255 samples per burst

Data record: Consult instrument software

Mode: Stop when full

Two alkaline 9V block battery

Ambient temperature: -15 ~ +45 °C

Depth rating: 40 m water depth max.

Titanium

Standard lengths of the instrument: 1.9 m (Type S), 2.4 m (Type N), 2.9 m (Type L)

Sensor area: 30 mm (Type S, N), 35 mm (Type L)

Head: 60 mm (diameter)

4.5 kg (Type S), 5.5 kg (Type N), 8.5 kg (Type L)