Operator Manual

748223-K June 2002

Model 7003M

BAROMETRIC

APPARENT O2 PARTIAL

O2 CONCENTRATION WITH

PRESSURE

PRESSURE

NO PRESSURE CORRECTION1

CM HG (IN. HG)

CM HG (DRY AIR)

 

73 (28.7)

15.3

20.24%

74 (29.1)

15.5

20.52

75 (29.5)

15.7

20.80

76 (29.9)

15.8

20.95

77 (30.3)

16.1

21.36

78 (30.7)

16.3

21.63

Table 4-4. Barometric Pressure Effect on Apparent Oxygen Concentration

KEY

DISPLAY

WHAT HAPPENS

DISPLAY

Nothing

Nothing

ACK

Nothing

Nothing

ALARM 1

Nothing

Nothing

ALARM 2

Nothing

Nothing

UP ARROW

10.8 →10.9

Changes pressure value

DOWN ARROW

10.9 →10.8

Changes pressure value

CAL

Nothing

Nothing

ENTER

"CPr" / "run"

Moves to calibration pressure input or goes back to RUN mode

Table 4-5. PRESSURE COMPENSATION Mode Key Functions

c.Pressure Compensation - Correction for Constant Pressure Differences

Refer to Figure 4-1 on page 4-3 and Table 4-5 above. If the sample and calibration gases are each at constant pressure, the following procedure should be used to correct for the pressure difference between them. However, the instrument does not monitor pressure and will not correct the output if either sample or calibration gas pressure changes. (See Section 5-2 on page 5-1).

1.From RUN mode, press CAL.

2.CAL, YES, CAL flash briefly, then the oxygen concentration is displayed with the right digit flashing.

3.Press CAL again.

4.PPr flashes, then previous sample pressure setting is displayed with right digit flashing (76.0 cm Hg is default).

5.Use ARROW keys to enter sample pressure.

6.Press ENTER to accept the value.

7.CPr flashes, then previous span gas pressure setting is displayed with right digit flashing (76.0 cm Hg is default).

8.Use the ARROW keys to enter pressure of the calibration gas to be used. If the sample and calibration gas will always be at the same pressure, set PPr and CPr at the same value.

9.Press ENTER to accept the value. Instrument returns to RUN mode.

1Computed using 20.946% oxygen at 760 m.

4-4 Calibration and Adjustments

Rosemount Analytical Inc. A Division of Emerson Process Management