A-2-6
Appendix 2: Analyzer Module Operating Specifications
42/24-10 EN Rev. 9
Uras26 Operating Specifications
Linearity deviation
≤
1 % of span
Repeatability
≤
0.5 % of span
Zero drift
≤
1 % of span per week;
for ranges smaller than Class 1 to Class 2:
≤
3 % of span per week
Sensitivity drift
≤
1 % of measured value per week
Output fluctuation (2
σ
)
≤
0.2 % of span at electronic T90 time = 5 sec. (class 1) or = 15 sec. (Class 2)
Detection limit (4
σ
)
≤
0.4 % of span at electronic T90 time = 5 sec. (class 1) or = 15 sec. (Class 2)
Flow influence
Flow in 20 to 100 l/h range: within detection limit
Associated gas
influence /
Cross-sensitivity
The knowledge of the sample gas composition is necessary for the analyzer
configuration. Selectivity measures to reduce associated gas effect (optional):
Installation of interference filters or filter cells or internal electronic cross-
sensitivity correction or carrier gas correction for a sample component by other
sample components measured with the Uras14.
Temperature
influence
•
At zero-point:
≤
1 % of span per 10 °C, for ranges smaller than Class 1 to
Class 2:
≤
2 % of span per 10 °C
•
On sensitivity with temperature compensation:
≤
3 % of measured value per
10 °C
•
On sensitivity with thermostat effect at 55 °C (option):
≤
1 % of measured value
per 10 °C
Ambient temperature in permissible range
Air pressure influence
•
At zero-point: no influence effect
•
On sensitivity with pressure correction via integral pressure sensor:
≤
0.2 % of
measured value per 1 % air pressure change
The pressure sensor is located in the sample gas path if hoses are used as the
internal gas lines. An external port is used for the pressure sensor if tubing is used
for the internal gas lines.
Pressure sensor working range: p
abs
= 600 to 1250 hPa
Power supply
influence
24 VDC
±
5 %:
≤
0.2 % of span
T
90
time
T
90
= 2.5 sec. for measurement cell length = 200 mm and sample gas flow = 60 l/h
without signal damping (low pass filter). Low-pass time constant adjustable from
0 to 60 sec.
