Electrical modifications of the Baird flame photometer which simplify calibration and improve accuracy of low potassium readings.

1HE BAIRD ASSOCIATES FLAME PHOTOMETER designed by White (1) has many advantages in the clinical laboratory for the measurement of serum sodium and potassium because of its simplicity and reliability. A balanced 2-photocell circuit with lithium salt in the diluent as an internal standard largely eliminates the effect of liquid height in the entrance funnel, gas and air pressure, flame’temperature, and factors affecting aerosol formation. However 2 simple modifications in the electrical circuit have improved the ease of operation and extended the usefulness of the instrument.