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Oxymitter 5000
4-1
OVERVIEW
This section identifies the calibration methods
available and provides the procedures to main-
tain and service the Oxymitter 5000 and op-
tional integrally mounted SPS 4000.
Install all protective equipment covers
and safety ground leads after equip-
ment repair or service. Failure to in-
stall covers and ground leads could
result in serious injury or death.
4-2
CALIBRATION
a. During a calibration, two calibration gases
with known O
concentrations are applied to
2
the Oxymitter 5000. Slope and constant
values calculated from the two calibration
gases determine if the Oxymitter 5000 is
correctly measuring the net concentration of
O
in the industrial process.
2
Before calibrating the Oxymitter 5000, verify
that the calibration gas parameters are cor-
rect by setting the gas concentrations used
when calibrating the unit (See paragraph
3-7a.5) and by setting the calibration gas
flowmeter.
The calibration gas flowmeter regulates the
calibration gas flow and must be set to 5
scfh. However, only adjust the flowmeter to
5 scfh after placing a new diffusion element
on the end of the Oxymitter 5000. Adjusting
the flowmeter at any other time can pres-
surize the cell and bias the calibration.
In applications with a heavy dust loading,
the O
probe diffusion element may become
2
plugged over time, causing a slower speed
of response. The best way to detect a
plugged diffusion element is to note the time
it takes the Oxymitter 5000 to return to the
normal process reading after the last cali-
bration gas is removed and the calibration
gas line is blocked off. A plugged element
also can be indicated by a slightly lower
reading on the flowmeter.
Rosemount Analytical Inc.
A Division of Emerson Process Management
SECTION 4
MAINTENANCE AND SERVICE
Instruction Manual
Change the diffusion element when the
calibration gas flowmeter reads slightly
lower during calibration or when the re-
sponse time to the process flue gases be-
comes very slow. Each time the diffusion
element is changed, reset the calibration
gas flowmeter to 5 scfh and calibrate the
Oxymitter 5000. To change the diffusion
element, refer to paragraph 4-8.
b. Three types of calibration methods are
available: automatic, semiautomatic, and
manual.
NOTE
A calibration can be aborted any time
during the process by pressing the
CAL key (Figure 4-2) on the Oxymitter
5000 keypad three times in a three
second interval or via FOUNDATION
fieldbus or an IMPS 4000. An aborted
calibration will retain the values of the
previous good calibration.
1. Automatic Calibration. Automatic cali-
brations require no operator action.
However, the calibration gases must
be permanently piped to the Oxymitter
5000, an SPS 4000 or IMPS 4000
must be installed to sequence the
gases, and the Oxymitter 5000's logic
I/O must be set to mode 8 via fieldbus
using the IO_PIN_MODE parameter so
the sequencer and Oxymitter 5000 can
communicate.
Depending on your system setup, an
automatic calibration can be initiated
by the following methods:
(a) The Oxymitter 5000's CALIBRA-
TION RECOMMENDED alarm sig-
nals that a calibration is required.
(b) Enter a time to next calibration us-
ing the TIME_TO_NEXT_CAL pa-
rameter via fieldbus. Calibrations
will then occur regularly at this
interval.
Maintenance and Service
IB-106-350 Rev. 1.2
April 2001
4-1
4
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Troubleshooting
