Parameter

Measurement Principle

Measurement Range

Resolution

Accuracy

Calibration

Operating Depth

Dissolved Oxygen % Air Saturation mg/L

Polarographic or Galvanic Cell Method

Polarographic or Galvanic Cell Method

0 to 500%

0 to 50 mg/L

0.1%

0.01 or 0.1 mg/L (depending on range)

0 to 200%: ±1% of reading or 1% air saturation, whichever is greater;

200% to 500%: ±15% of reading

0 to 20 mg/L: ±1% of reading or 0.1 mg/L, whichever is greater;

20 to 50 mg/L: ±15% of reading

One-point or two-point calibration with 0%

One-point or two-point calibration with 0%

Temperature

Field Rugged Cable

Laboratory Grade Cable

－5 to 70℃

－5 to 70℃

0.01℃

0.01℃

±0.2℃

±0.35℃

4 meters

Conductivity*

Four-Electrode Flow-Through Conductivity Cell Method

0 to 200 mS/cm

0.001 to 0.1 mS/cm (depending on range)

±0.5% of reading or 0.001 mS/cm, whichever is greater (4m cable)

±1% of reading or 0.001 mS/cm, whichever is greater (20m cable)

1 point

Salinity

Calculated from Conductivity and Temperature

0－70 ppt

0.01 ppt

±1% of reading or 0.1 ppt, whichever is greater

1 point

pH

Glass Combination Electrode Method

0－14

0.01

±0.2

1, 2, 3, 4, 5, or 6 points (optional)***

ORP

Platinum Electrode Method

－1999 to 1999 mV

0.1 mV

±20 mV

1 point

Ammonium Nitrogen**

Ion-Selective Electrode Method

0－200 mg N/L (0－40℃)

0.1 mg N/L

±10% of reading or 2 mg N/L, whichever is greater

1, 2, or 3 points (optional)

17 meters

Nitrate Nitrogen**

Ion-Selective Electrode Method

0－200 mg N/L (0－40℃)

0.1 mg N/L

±10% of reading or 2 mg N/L, whichever is greater

1, 2, or 3 points (optional)

17 meters

Chloride**

Ion-Selective Electrode Method

0－200 mg N/L (0－40℃)

0.1 mg/L

±15% of reading or 5 mg N/L, whichever is greater

1, 2, or 3 points (optional)

17 meters

Total Dissolved Solids

Calculated from Conductivity and Temperature

0 to 100 g/L (input 0.30 to 1.00, default 0.64)

0.001, 0.01, 0.1 g/L

Barometric Pressure

Piezoresistive Method

50 to 110 kPa

0.01 kPa

±0.4 kPa (within ±15℃ of calibration point)

1 point

*Parameters calculated from this include resistivity, salinity, specific conductance, and total dissolved solids; **Ion electrodes are only suitable for freshwater; ***Additionally: US, NIST, or custom buffers