Instruction Manual
245364-V
May 2002
1-4 Description and Specifications Rosemount Analytical Inc. A Division of Emerson Process Management
Model 755A
1-7 SPECIFICATIONS
a. General
1
Operating Range
...........................
0.00% to 100.0% oxygen
Recorder Range
............................
Selectable for 0% to 100% oxygen or for any desired span of 1%,
2%, 5%, 10%, 20% or 100% oxygen within the overall range.
Response Time
.............................
(90% of fullscale) recorder output factory set for 20 seconds;
adjustable from 5 to 25 seconds.
Reproducibility (Digital Display)
.....
±
0.01% Oxygen
±
2 counts.
Ambient Temperature Limits
Maximum ............................... 49
°
C (120
°
F) EXCEPT 38
°
C (100
°
F) for 99% to 100% oxygen.
Minimum ................................ -7
°
C (20
°
F) EXCEPT 4
°
C (40
°
F) for 99% to 100% oxygen.
Zero and Span Drift
2
......................
Within
±
1% of fullscale (
±
2% of fullscale for 99% to 100% range)
per 24 hours, provided that ambient temperature does not change
by more than 11.1
°
C (20
°
F).
±
2.5% of fullscale per 24 hours with ambient temperature change
over entire range.
Barometric Pressure
Compensation ....................... Oxygen readout automatically corrected to within
±
1% of fullscale
for barometric pressure variations within
±
3% of target value and
within
±
2% of fullscale for barometric pressure variations within
±
5% of target value.
The target may be set anywhere within range of -2.7 to 3.3 psig
±
3
psig (-18.6 to 22.8 kPa
±
21 kPa).
Exhaust vented to atmosphere.
b. Sample
Dryness ......................................... Sample dewpoint below 43
°
C (110
°
F), sample free of entrained
liquids.
Temperature Limits
Maximum ............................... 66
°
C (150
°
F)
Minimum ................................ 10
°
C (50
°
F)
Operating Pressure
Maximum ............................... 69 kPa (10 psig).
Minimum ................................ -13.1 kPa (-1.9 psig)
Flow Rate
3
Maximum ............................... 500 cc/min
Minimum ................................ 50 cc/min
Recommended ...................... 250
±
20 cc/min
Materials in Contact with
Sample Gas........................... 316 stainless steel, glass, titanium, Paliney No. 7, epoxy resin,
Viton-A, platinum, nickel.
1
Performance specifications based on recorder output.
2
Zero and span drift specifications based on following conditions: Operating pressure constant; ambient temperature change
from initial calibration temperature, less than 11.1 Celsius degrees (20 Fahrenheit degrees); deviation from set flow held to
within
±
10% or
±
20 cc/min, whichever is smaller.
3
Deviation from set flow would be held to within
±
10% or
±
20 cc/min, whichever is smaller. If so, zero and span drift will be
within specifications, provided that operating temperature remains constant.
