Hazardous Area Oxymitter 5000
3-6
Instruction Manual
IM-106-350C, Rev 2.2
July 2008
Recommended
Configuration
Fieldbus Signal Upon Critical Alarm
Emerson Process Management recommends that the factory default be
utilized. When a critical alarm occurs which causes the O
2
reading to become
unstable or unreliable, the Oxymitter will flag the O
2
reading. All further O
2
readings will be flagged as Out Of Service until the problem has been
corrected.
If the O
2
measurement is being utilized as part of an automatic control loop,
the loop should be placed into manual upon this failure event or other
appropriate action should be taken.
Calibration
Emerson Process Management recommends utilizing an autocalibration
system, actuated by the "calibration recommended" diagnostic. New O
2
cells
may operate for more than a year, but older cells may require recalibration
every few weeks as they near the end of their life. This strategy ensures that
the O
2
reading is always accurate, and eliminates many unnecessary
calibrations based on calendar days or weeks since previous calibration.
When utilizing the SPS 4001B or IMPS 4000, consider wiring some or all
associated alarm contacts.
1. CALIBRATION INITIATE. Contact from the control room to an SPS
4001B or IMPS 4000 (one per probe) provides the ability to manually
initiate a calibration at any time from the control room. Note that
calibrations can also be initiated via Foundation fieldbus or from the
keypad on the Hazardous Area Oxymitter 5000.
2. IN CALIBRATION. One contact per probe provides notification to the
control room that the "calibration recommended" diagnostic has initiated
an automatic calibration through the SPS 4001B or IMPS 4000. If the O
2
signal is being utilized in an automatic control loop, this contact should
be utilized to place the control loop into manual during calibration.
3. CALIBRATION FAILED. One contact per probe from an SPS 4001B or
IMPS 4000 to the control room for notification that the calibration
procedure failed. Grouped with this alarm is an output from a pressure
switch which indicates when the calibration gas bottles are empty.
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