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1. If the barometric pressure measured by the controller does not agree with the local barometric pressure, cal-
ibrate the pressure sensor. A pressure error of 3 mm Hg introduces an error of about 0.5% in the final meas-
urement. When calibrating the pressure reading, be sure to use the actual barometric pressure. Weather fore-
casters and airports usually report barometric pressure corrected to sea level; they do not report the acutal
pressure. It is good practice to open the enclosure door before starting a barometric pressure calibration.
When gland fittings are used, the controller enclosure is moderately airtight. As the controller enclosure heats
or cools, the pressure of the air trapped inside the enclosure may be as much as 5% different from ambient
pressure.
7.5 CALIBRATING BAROMETRIC PRESSURE
MODEL 54eA SECTION 7.0
CALIBRATION - DISSOLVED OXYGEN
2. From the main display, press any key. With the cursor on “Calibrate,”
press Enter (F4).
3. Press Enter (F4) to select “Calibrate main sensor.”
4. Press the key twice to move the cursor to “Barometric pressure.”
Press Enter (F4).
5. Press Edit (F4). Use the arrow keys to change the pressure reading
to the desired value. Press Save (F4) to store the value.
6. Press Exit (F1) four times to return to the main display.
Calibrate main sensor
Zero main sensor
Adjust temperature
Exit Enter
Calibrate in air
Calibrate in process
Barometric pressure
Exit Enter
763
mm Hg
Standardize : 760
Exit Edit