Emerson Rosemount Oxymitter 4000 Reference Manual page 137

July 2018
3.
4.
Maintenance and Service
If performing a manual calibration with the CALIBRATION RECOMMENDED LED off
and the CAL LED off, start at step a.
If performing a manual calibration with the CALIBRATION RECOMMENDED LED on
and the CAL LED on, start at step b.
a. Push the CAL key. The CALIBRATION RECOMMENDED LED will come on
and the CAL LED will be on solid. If a multimeter is attached across TP5
and TP6, the reading will display the percentage of oxygen seen by the
cell.
b. Push the CAL key. The CALIBRATION RECOMMENDED LED will turn off and
the CAL LED will flash continuously. The Hazardous Area Oxymitter 4000
can be configured so that the 4-20 mA signal will hold the last value. The
default condition is for the output to track. A flashing LED indicates that
the Hazardous Area Oxymitter 4000 is ready to accept the first calibration
gas.
c. Apply the first calibration gas. (Electronics will abort the calibration if step
4 is not done within 30 minutes).
d. Push the CAL key; the CAL LED will be on solid. A timer is activated to
allow the calibration gas adequate time to flow (default time of five
minutes). When the timer times out, the Hazardous Area Oxymitter 4000
has taken the readings using the first calibration gas and the CAL LED will
flash continuously. The flashing indicates the Hazardous Area Oxymitter
4000 is ready to take readings using the second calibration gas.
e. Remove the first calibration gas and apply the second calibration gas.
(Electronics will abort the calibration if step 6 is not done within 30
minutes).
f. Push the CAL key; the CAL LED will be on solid. The timer is activated
for the second calibration gas flow. When the timer times out, the CAL
LED will flash a 2 pattern flash or a 3 pattern flash (2 pattern flash equals
a valid calibration, 3 pattern flash equals an invalid calibration). If the slope
or the constant is out of specification, a diagnostic alarm LED will be
flashing. The diagnostic alarm will remain active until the purge cycle is
over. If the three pattern flash occurs without a diagnostic alarm, the
calibration gases could be the same or the calibration gas was not turned
on.
A flashing CAL LED indicates the calibration is done. (See Section 8:
Troubleshooting, for an explanation of the 2 pattern and 3 pattern
flashes).
g. Remove the second calibration gas and cap off the calibration gas port.
h. Push the CAL key; the CAL LED will be on solid as the unit purges. (Default
purge time is three minutes). When the purge is complete, the CAL LED
will turn off and the Hazardous Area Oxymitter 4000 output unlocks from
its held value and begins to read the process O
Rosemount Oxymitter 4000
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