parameter

measuring principle

measuring range

resolution

accuracy

calibration

Working Depth

dissolved oxygen

%Air saturation

Polarographic method or primary battery method

0-500%

0.1% or 1% air saturation

(Optional)

0-200%: ± 2% of the reading or 2% air saturation,

Whichever is larger;

200-500%: ± 6% of reading

1 point or two-point calibration with 0%

Milligrams per liter

0-50mg/L

0.1 or 0.01mg/L

(Optional)

0-20mg/L: ± 2% of the reading or 0.2mg/L,

Whichever is larger;

20-50mg/L: ± 6% of reading

1 point or two-point calibration with 0%

temperature

Field durable cable

-5 to 70 ℃

0.1

±0.2℃

4m

Laboratory grade cables

5 to 70 ℃

0.1

±0.35℃

Conductivity*

Four electrode flow type

Conductivity measurement tube method

0-200mS/cm

0.001-0.1mS/cm

(Depending on the range)

± 0.5% of the reading or 0.001mS/cm,

Whichever is larger (4m cable);

± 1% of the reading or 0.1 ppt,

Whichever is larger (20m cable)

one o'clock

salinity

Calculated from conductivity and temperature

0-70ppt

0.01ppt

± 1% of the reading or 0.1 ppt,

Whichever is larger, 0.2

one o'clock

pH

Glass composite electrode method

0-14

0.01

±0.2

1, 2, 3, 4, 5 or 6 o'clock

(Optional)

ORP

Platinum electrode method

-1999 to 1999mV

0.1mV

±0.2mV

one o'clock

ammonium nitrogen

Ion selective electrode method

0-200mg/L-N

(0-40)

0.1mg/L-N

± 10% of the reading or 2mg/L-N,

Whichever is larger

1, 2 or 3 o'clock

(Optional)

17m

Nitrate nitrogen**

Ion selective electrode method

0-200mg/L-N

(0-40)

0.1mg/L-N

± 10% of the reading or 2mg/L-N,

Whichever is larger

1, 2 or 3 o'clock

(Optional)

17m

Chloride**

Ion selective electrode method

0-1000mg/L

(0-40)

0.1mg/L

± 15% of the reading or 5mg/L,

Whichever is larger

1, 2 or 3 o'clock

(Optional)

17m

total dissolved solids

Calculated from conductivity and temperature

0-100g/L

(Can input 0.30 to 1.00, default value is 0.64)

0.001，

0.01，

0.1 g/L

0.4kPa

(Temperature changes within ± 15 ℃ of calibration point)

air pressure

Piezoresistive method

50-110kPa

0.01kPa

one o'clock

Note:

*The parameters calculated from this include resistivity, salinity, specific conductivity, and total dissolved solids

**Ionic electrodes are only suitable for freshwater

***Additionally: US, NIST, or custom buffer solutions

parameter

measuring range

resolution

accuracy

PH value

-2.60 to 16.60

0.1mV (0.01pH unit)

± 0.1mV (± 0.01pH unit)

Oxidation-reduction potential

-1999 to+1999mV

0.01mV

±0.5mV

conductivity

0.0-200 mS/cm

0.001mS/cm or 0.1 μ S/cm-0.1mS/cm (depending on the range)

± 0.3% ± 1 digit of the full range

dissolved oxygen

0.00-90mg/L

0-550%

0.01mg/L,0.1%

± 0.2% of full range (550% air saturation)

Previous position (at 10 o'clock, using 1.25PE cover film)

temperature

-10 to 100

0.1℃

Full range ± 0.1% 1-digit