Model 7003m – Emerson 7003M User Manual
Page 50
Operator Manual
748223-K
June 2002
4-4 Calibration and Adjustments
Rosemount Analytical Inc. A Division of Emerson Process Management
Model 7003M
BAROMETRIC
PRESSURE
CM HG (IN. HG)
APPARENT O
2
PARTIAL
PRESSURE
CM HG (DRY AIR)
O
2
CONCENTRATION WITH
NO PRESSURE CORRECTION
1
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
1
Computed using 20.946% oxygen at 760 m.
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.