Portable Dissolved Oxygen Meter MHK-W30

Portable Dissolved Oxygen Meter MHK-W30

MHK-W30 is a precise portable dissolved oxygen (DO) meter that measures dissolved oxygen in % and mg/L and temperature in water and is suitable for a wide range of applications, such as educational and aquaculture, as well as water and environmental analysis. It is suitable for monitoring the oxygen levels of lakes, shrimp and fish tanks. 

Features

Measures dissolved oxygen in % and mg/L plus temperature

Automatic temperature compensation via temperature in probe provides accurate reading over the entire range

Adjustable barometric and salinity compensation 

°C or °F unit switchable with 0.1°C/0.1°F resolution

Hold function freezes readings for easy viewing and recording

Support 1 and 2 points dissolved oxygen calibration at 100% water-saturated air and in 0 oxygen solution

Comes with a plastic toolbox convenient for in-field use

Powered by 3 AA alkaline batteries

Applications

Municipal wastewater/sewage treatment

Environmental water testing

Aquaculture/aquariums for measuring oxygen level in fish and shrimp farming

Natural stream purification system

Boilers

Educational in laboratories and schools

Biochemical manufacturing

Device

1.      TFT display

2.      Power button

3.      Select button

4.      Enter button

5.      Dissolved oxygen polarographic electrode probe

6.      Probe socket

7.      Battery compartment cover

Display

1.        Hold function prompt

2.        Battery gauge

3.        Dissolved oxygen value

4.        Dissolved oxygen units (% or mg/L)

5.        Barometric pressure (mmHg)

6.        Salinity (in ppt)

7.        Temperature

8.        Temperature Unit

Barometric Pressure Compensation

The MHK-W30 uses a user inputted barometric pressure value in mmHg to compensate dissolved oxygen mg/L values. The barometric compensation value entered in the MHK-W30 should be the local barometric pressure value.

Do not use a barometer value that is corrected to sea level. Laboratory barometer readings are usually uncorrected values of air pressure and can be used for barometer calibration.  An approximate formula for this “uncorrection” is:

True Barometric Pressure (mmHg) =

[Corrected BP mmHg] – [2.5 * (Local Altitude in ft. above sea level/100)]

Prior to the calibration or measurement, if true barometric pressure is unknown, users need to set the compatible parameter according to the local altitude. The following table 1 describes the relationship between altitude and barometric pressure.

Table 1 Relationship between Altitude and Barometric Pressure

The barometric pressure can be adjusted any time without the need to recalibrate dissolved oxygen.

Salinity Compensation

The MHK-W30 uses a user inputted salinity value in ppt (parts per thousands) to compensate dissolved oxygen mg/L values. The salinity compensation value entered in the MHK-W30 should be the salinity value of the water you are testing.

The salinity can be adjusted any time without the need to recalibrate dissolved oxygen.

Specifications

Dissolved Oxygen Specification:

Temperature Specification:

General Specification: