Emerson Rosemount OCX 8800 - Mechanical installation

CAUTION!
FLAMEPROOF DEVICES
To maintain explosion-proof protection of the OCX88C in hazardous areas, all cable entry
devices and blanking elements for unused apertures must be certified flameproof, suitable for
the conditions of use, and properly installed.
CAUTION!
HIGH TEMPERATURE SURFACES
To maintain explosion-proof protection of the OCX88C in hazardous areas, the sensor housing
must not be mounted to any surface or flange that exceeds 195 °C (383 °F).
CAUTION!
HIGH TEMPERATURE SAMPLE
To maintain explosion-proof protection of the OCX88C in hazardous areas, the sample entering
the sensor housing must not exceed 195 °C (383 °F).
2.2 Mechanical installation
2.2.1 Selecting a location
The location of the OCX 8800 in the stack or flue is most important for maximum accuracy
in the oxygen analyzing process. The probe must be positioned so the gas it measures is
representative of the process. Best results are normally obtained if the transmitter is
positioned near the center of the duct (40 - 60% insertion). Longer ducts may require
several transmitters, as the oxygen and combustibles can vary due to stratification. A point
too near the wall of the duct or the inside radius of a bend may not provide a
representative sample because of the very low flow conditions. Select the sensing point so
that the process gas temperature falls within the range of the probe material used.
Figure 2-1 through #unique_73/fig_ght_spm_gz provide mechanical installation references.
The ambient temperature inside the electronics housing must not exceed 85 °C (185 °F) .
Procedure
1. Check the flue or stack for holes and air leakage. The presence of this condition
substantially affects the accuracy of the oxygen and combustibles readings.
Therefore, either make the necessary repairs or install the transmitter upstream of
any leakage.
2. Ensure the area is clear of internal and external obstructions that will interfere with
installation and maintenance access to the unit. Allow adequate clearance for the
removal of the OCX 8800.
Install
20 OCX 8800