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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.