Filter
Top Products
Instruction Manual
760007-A
July 2003
3-6 Operation Rosemount Analytical Inc. A Division of Emerson Process Management
Model NGA2000 PMD
pressed range. Table 3-3 below shows rec-
ommended zero and span standard gases for
suppressed range oxygen indication in an Ar-
gon background.
RANGE % OXYGEN
RECOMMENDED ZERO
STANDARD GAS
RECOMMENDED SPAN
STANDARD GAS
0 to 1 Nitrogen 0.9% O2, balance N2
0 to 2.5 Nitrogen 2.3% O2, balance N2
0 to 5 Nitrogen 4.5% O2, balance N2
0 to 10 Nitrogen 9% O2, balance N2
0 to 25 Nitrogen Air (20.93% O2)
0 to 50 Nitrogen 45% O2, balance N2
0 to 100 Nitrogen 100% O2
Table 3-2. Calibration Range for Various Zero Based Operating Ranges
RANGE % OXYGEN
RECOMMENDED ZERO STANDARD
GAS
RECOMMENDED SPAN
STANDARD GAS
50 to 100 50 - 50.5% O2 Balance AR 100% O2
70 – 100% 70 – 70.5% O2 Balance AR 100% O2
98 – 100% 98 – 98.5% O2 Balance AR 100% O2
99 – 100% 99 – 99.5% O2 Balance AR 100% O2
Table 3-3. Calibration Range for Various Suppressed Range Operations
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 be-
cause 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