Teledyne Analytical Instruments LXT-380, Instructions Manual

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Calibration LXT-380 Universal Transmitter
Teledyne Analytical Instruments
44
The actual concentration in mg/L (C) is equal to the Saturation
value at the given temperature multiplied by the altitude and air pressure
corrections. Determine the calibration temperature and look up the
saturation value (S) in Table 1 below. Then determine the altitude
correction (K) from Table 2 and the current air pressure in bar (P), 1 bar
equals 14.7 psi. Use 1 bar if the actual air pressure is unknown.
C = S x K x P
Example:
Temperature = 20°C → Saturation = 9.08 mg/L, Altitude = 1200 Ft. →
K = 0.960, Air Pressure 1.014 bar:
C = 9.08 x 0.960 x 1.014 = 8.84 mg/L
The LXT-380 transmitter uses the temperature compensated
Saturation Index for AUTO Cal, however the user can enter the altitude
and pressure compensated value of 8.84 ppm as the calibration value
when prompted to “Accept Value?” in CAL 2.
Table 1 Saturation Index