Instruction Manual
Model NGA2000 PMD
pressed range. Table
suppressed range oxygen indication in an Argon background.
RANGE % OXYGEN | RECOMMENDED ZERO | RECOMMENDED SPAN | |
STANDARD GAS | STANDARD GAS | ||
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0 to 1 | Nitrogen | 0.9% O2, balance N2 | |
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0 to 2.5 | Nitrogen | 2.3% O2, balance N2 | |
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0 to 5 | Nitrogen | 4.5% O2, balance N2 | |
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0 to 10 | Nitrogen | 9% O2, balance N2 | |
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0 to 25 | Nitrogen | Air (20.93% O2) | |
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0 to 50 | Nitrogen | 45% O2, balance N2 | |
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0 to 100 | Nitrogen | 100% O2 | |
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Table
RANGE % OXYGEN | RECOMMENDED ZERO STANDARD | RECOMMENDED SPAN | |
GAS | STANDARD GAS | ||
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50 to 100 | 50 - 50.5% O2 Balance AR | 100% O2 | |
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70 – 100% | 70 – 70.5% O2 Balance AR | 100% O2 | |
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98 – 100% | 98 – 98.5% O2 Balance AR | 100% O2 | |
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99 – 100% | 99 – 99.5% O2 Balance AR | 100% O2 | |
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Table
If the user is unable to calibrate the Analyzer Module (i.e., when ZERO or SPAN is initiated, nothing happens), a possible solution relates to the use of an incorrect gas for zeroing or spanning (e.g., using a high concentration gas to zero or a zero gas to span the Analyzer Module). Recalibrating with the appropriate gas(es) WILL NOT correct the problem because the ZERO OFFSET or SPAN FACTOR has been set to an extreme value in the proc- ess.
To remedy the problem, do the following:
1.Select the following from the Main Menu: Expert Controls and Setup (enter security
code if necessary), Analyzer Module Setup, and Calibration Parameters.
2.Using the down arrow, select Zero Ranges, press ENTER and, using the up/down arrows, toggle to SEPARATE. Do the same for the Span Ranges selec- tion. Do not press ESCAPE at any time unless retention of prior settings is de- sired.
3.Return to the Main Menu (HOME) and make the following selections: Expert Controls and Setup (enter security code if necessary), Expert Analyzer Controls, CAL softkey, FACTORS softkey, and
Rosemount Analytical Inc. A Division of Emerson Process Management |