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SECTION 6,
continued
Enter a new barometric pressure when the barometric pressure or the altitude of the instrument
changes using one of the methods below:
Using Sea Level Equivalent
1.
Obtain the sea level equivalent barometric
pressure from TV, radio, or a local airport.
2.
Enter this value into the meter according to
Section 3.1.5 Changing the Barometric
Pressure.
3.
Enter the local altitude according to Section
3.1.6 Adjusting the Altitude.
Sampling and Storage
Accuracy Check
Method Performance
Table 5 Adjusting Barometric Pressure and Altitude
Collect samples in 300 mL glass BOD bottles. Fill completely.
Analyze immediately.
Checking Calibration Accuracy
Return the electrode to the calibration and storage chamber. The
chamber should contain a wet sponge or a small amount of water.
Allow at least 10 minutes for stabilization. Enter the current
barometric pressure and altitude into the meter according to
Sections 3.1.5 and 3.1.6. The meter should display
. If not, recalibrate the meter.
saturation
Precision
In a single lab using one sample at 7.45 mg/L DO and one sample
at 5.10 mg/L DO, the electrode was moved between the two
samples with no rinsing in between. A single operator with a
ion
single sens
0.03 mg/L DO.
Using True Barometric Pressure
1.
Obtain the true barometric pressure from a
nearby mercury barometer or use Table 8 on
page 68.
2.
Enter this value into the meter according to
Section 3.1.5 Changing the Barometric
Pressure.
3.
Enter the altitude as
according to Section 3.1.6 Adjusting the
Altitude.
6 meter obtained a standard deviation of
63
0
feet or meters
100%
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