Model 7003M

Operator Manual

748223-K June 2002

d.Zero Offset Adjustment

Following the last procedure, the current zero offset value will be flashing.

NOTE

When flowing zero gas over the sen- sor, ensure that there are no leaks and the gas actually has zero oxygen con- centration. Otherwise, significant errors will result. Zero offset adjustment is generally not required. Errors are more often due to incorrect zero gas oxygen concentration than residual current of the oxygen sensor.

The zero offset adjustment allows the operator to compensate for any residual sensor current. Adjustment range is 0-5% equivalent oxygen.

Sensor Current = Current from

Oxygen + Residual Current

Zero Offset Is Not To Be Changed

Press ENTER to return analyzer to RUN mode, and skip the remainder of this procedure.

Zero Offset Is To Be Removed

1.Press the UP ARROW until the maximum value is displayed.

2.Press ENTER and re-calibrate with span gas per Section 4-2b on page 4- 1.

Zero Offset To Be Adjusted

1.Expose the sensor to 100% oxygen- free nitrogen or other inert gas and allow the sensor signal to stabilize (2- 5 hours depending on sample conditions).

2.Use the DOWN ARROW to bring the displayed value to zero (for maximum offset).

NOTE

Adjusting the zero offset affects the output of the Model 7003M. Therefore, if the zero offset is changed, the system must be re-calibrated with span gas.

3.Press ENTER to return to RUN mode.

4.Re-calibrate with span gas per Section 4-2b on page 4-1.

Rosemount Analytical Inc. A Division of Emerson Process Management

Operation 3-15