Emerson Oxymitter 5000 Instruction Manual page 54

Instruction Manual
IB-106-350 Rev. 1.2
April 2001
c. Verify Oxymitter 5000 Configuration
(Figure 3-2)
Located on the microprocessor board, the
top board, is a switch that controls the
simulate enable status of the Oxymitter
5000. To allow the Oxymitter to be placed in
simulation mode, place position two of SW2
in the ON position. Once the Oxymitter has
been set to the simulate mode, switch posi-
tion two of SW2 to the OFF position to re-
move the Oxymitter from simulate mode.
Note that SW2 does not actually place the
Oxymitter in simulate mode, it only allows
the Oxymitter to be placed into simulate
mode through the fieldbus interface.
Positions 1, 3, and 4 of SW 2 are not used,
and should remain in the OFF position.
Typically, the probe's sensing cell,
which is in direct contact with the pro-
cess gases, is heated to approximately
1357°F (736°C), and the external tem-
perature of the probe body may ex-
ceed 842°F (450°C). If operating
conditions also contain high oxygen
levels and combustible gases, the
Oxymitter 5000 may self-ignite.
d. O Range
2
The O range of the Oxmitter is set through
2
the fieldbus interface using the AI block.
3-2 Startup and Operation
Refer to Appendix A for more information on
using the AI block.
e. Once the cell is up to operating tempera-
ture, the O
1. Access TP5 and TP6 next to the mem-
brane keypad. Attach a multimeter
across TP5 and TP6. The calibration
and process gases can now be moni-
tored. Pressing the INC or DEC once
will cause the output to switch from the
process gas to the calibration gas.
Pressing INC or DEC a second time
will increase or decrease the calibra-
tion gas parameter. If the keys have
been inactive for one minute, the out-
put reverts to the process gas. When a
calibration has been initiated, the value
at TP5 and TP6 is the % O
the cell. Oxygen levels, as seen on the
multimeter, are:
8.0% O
0.4% O
The maximum reading available at TP5
and TP6 is 30 VDC. While the Oxymit-
ter will measure oxygen concentra-
tions up to 40%, the test point output
will reach a maximum of 30 VDC at a
30% oxygen concentration.
2. FOUNDATION fieldbus.
Rosemount Analytical Inc. A Division of Emerson Process Management
Oxymitter 5000
percentage can be read:
2
seen by
2
= 8.0 VDC
2
= 0.4 VDC
2
NOTE