SM600 Portable Dissolved Oxygen Meter for Education

The SM600 is a Portable Dissolved Oxygen meter ideal for use in school laboratories. Dissolved Oxygen measurements are also very important in fish farms and ponds, where Oxygen levels are continuously monitored to obtain optimal reproduction.  The SM600 calibrates easily in 2 points (at 100% saturated air and in 0 Oxygen solution) and has Automatic Temperature Compensation which guarantees the highest accuracy.  The low battery warning, easy to replace screw on cap membranes make this meter very simple to operate. Rugged Carrying Case (Optional) provides handy on-site meter calibration and measurements.  SM600 is supplied complete with a MA840 D.O. polarographic probe with 3 m cable, calibration screwdriver, 2 spare membranes, MA7040 (30 mL) electrolyte solution, battery and instructions.

ALTITUDE & SALINITY COMPENSATION: If the sample contains salts or if you are performing the measurements at altitude different from sea level, the readout values must be corrected, taking into account the lower degree of oxygen solubility.  Altitude Compensation: all the readouts are referred to sea level, thus the displayed measurements are higher than the actual values. In fact, altitude affects D.O. concentration by decreasing its value.  The table on the left reports the oxygen solubility at various temperatures and altitudes, based on sea level barometric pressure of 760 mmHg.This gives an idea of the error that can be introduced at different altitudes and allows to calculate the quantity to be subtracted to correct the reading. Salinity Compensation: the table below shows the influence of salt concentration in the measurement of oxygen.  In SM600 all the readouts are referred to 0 g/l of salinity value. In fact, salinity affects D.O. concentration by decreasing its value. The table below reports the oxygen solubility at various temperatures and salinity.  From the table it is possible to calculate the quantity to be subtracted to correct the reading.

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Mi605 Portable D.O. Meter for Field Applications

Mi605 is a portable, microprocessor-based, Dissolved Oxygen meter with automatic calibration and temperature compensation (ATC) specifically designed for spot sampling applications. Dissolved Oxygen measurements can be displayed in parts per million (ppm=mg/L) or in % of saturation.  The temperature is indicated in Celsius from 0 to 50°C with 0.1 resolution. The meter compensates salinity and altitude automatically after manual input.  Calibration is very simple and fast: just expose the polarographic  Dissolved Oxygen probe MA840, supplied with the instrument, to air and press the CAL button.  No need for chemical solutions!  A HOLD button allows the user to freeze the reading on the LCD.  The low battery indicator and the easy to replace screw on cap membranes make the Mi605 a compact instrument and ideal for all applications: Aquaculture, waste water, environmental and educational.

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