Rosemount 755A, Инструкция по эксплуатации

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I
NITIAL
S
TARTUP AND
C
ALIBRATION
245364-U Rosemount Analytical April 2000 3-3
Model 755A Oxygen Analyzer
3. Select the required zero suppression by appropriate settings of the following:
a. Set Recorder Zero Suppression Jumper for fixed value of 0%, 20%, 40%, 60%
or 80% oxygen.
b. Set Recorder Zero Suppression Coarse Adjustment R41 for appropriate value
in the range of 05 to 25% oxygen.
Note:
The actual applied zero suppression may be measured and established via
readout on the digital display per the procedure of Section 3.1.2.
Example 1, Selection of a Zero-Based Recorder Output Range:
•
Desired oxygen range for recorder output: 0 to 100%.
•
Required span of 100% oxygen is selected when Recorder Oxygen Span
Jumper is in the 1X position.
•
Required Zero Suppression is 0%, thus Recorder Zero Suppression Jumper, is
removed, and R41, Recorder Zero Suppression Coarse Adjustment, and R104,
Recorder Zero Suppression Fine Adjustment, are adjusted for 0% oxygen.
Note:
The Zero and Span adjustments on the analyzer door are used only for the
calibration of the digital readout for 0 to 100% oxygen.
The suppressed recorder ranges may only be set up after the digital readout has
been calibrated. When setting up a suppressed recorder range, use only R41,
R104 (setpoint) and R88 (Span) for adjustments. DO NOT RE-ADJUST THE
ZERO AND SPAN CONTROLS ON THE ANALYZER DOOR.
Example 2, Selection of a Zero-Suppressed Recorder Oxygen Range.
•
Desired oxygen range for recorder output: 90% to 100%.
•
Required span of 10% oxygen (100% - 90%) is selected when Recorder
Oxygen Span Jumper is placed in the 10X gain position.
•
Required zero suppression is 90% oxygen, thus Recorder Zero Suppression
Jumper, is placed in 80% position, the highest setting below the zero
suppression level, and R41, Recorder Zero Suppression Coarse Adjustment,
and R104, Recorder Zero Suppression Fine Adjustment, are adjusted for the
additional 10% required to reach the desired zero suppression level (90%
desired level - 80% zero suppression Jumper).