Model 3081FG
Instruction Manual
9.Connect the ribbon cable connector between display board (11) and the CPU board of PC board stack (10). Ensure the cable connector is fully seated.
10.Reposition display board (11) on the standoffs. Rotate the display board 90 degrees either way as desired.
11.Install and tighten all three screws (12) and circuit end cap (13).
12.Tighten cover lock screw (14) until cover lock (15) engages knurled sur- face of circuit end cap (13).
Use heat resistant gloves and clothing when removing the probe. The probe can be as hot as 1600°C (2912°F). This
can cause severe burns.
5-2 OXYGEN PROBE REPLACEMENT
The oxygen probe is designed with ceramic materials to provide maximum life at elevated temperatures and is not rebuildable. The condi- tion of the sensing cell can be determined peri- odically by two methods:
•Note the cell impedance at the electronics. When the impedance displays a warning in- dication (WARN), increase the frequency of impedance readings. A cell with a sustained high impedance indication (HI) indicates a probe that is beyond its useful life.
•Conduct a calibration check. Follow the prompts provided by the electronics through the process of flowing two calibration check
gases of known values. Record the generated slope and constant values.
Probe replacement may be conducted online as long as the process in which the probe is mounted is operating at a negative, or slightly positive, pressure. Refer to Section 6, TROU- BLESHOOTING, for more information.
Do not install or remove probes from a process where pressures are more than a few inches of H2O positive pressure. Hot gases may escape from the stack and cause severe personal injury.
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Do not insert or withdraw a probe into |
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or out of a hot process faster than 1 in. |
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(25.4 mm) per minute or instrument |
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damage from thermal shock may |
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occur. |
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Also, ash, slag, or other materials can |
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build up on the probe body in some |
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applications. If this buildup is causing |
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difficulty when withdrawing the probe, |
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DO NOT FORCE. Rotate the probe |
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back and forth to attempt to loosen the |
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material on the probe body. Or, wait |
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until the process cools down and ac- |
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cess the buildup from inside the |
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furnace. |
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Refer to Table
Rosemount Analytical Inc. A Division of Emerson Process Management | Maintenance and Service |
