42/24-10 EN Rev. 9
Appendix 2: Analyzer Module Operating Specifications
A-2-1
Appendix 2
Analyzer Module Operating Specifications
The analyzer module characteristics indicated apply only when operated in
conjunction with the central unit.
The performance characteristics have been determined according to the inter-
national standard IEC 1207-1: 1994 “Expression of performance of gas analyzers”.
They are based on N
2
as the associated gas. Compliance with these characteris-
tics when measuring other gas mixtures can only be assured if their composition
is known.
Caldos25 Operating Specifications
Linearity deviation
≤
2 % of span
Repeatability
≤
1 % of span
Zero drift
≤
1 % of span per week
Sensitivity drift
≤
1 % of measured value per week
Output fluctuation (2
σ
)
≤
0.5 % of smallest measurement range span at electronic T90 time = 0 sec.
Detection limit (4
σ
)
≤
1 % of smallest measurement range span at electronic T90 time = 0 sec.
Flow influence
≤
1 to 5 % of span at a flow change of
±
10 l/h. At the same sample and test gas
flow rate the flow influence is automatically compensated.
Associated gas
influence
The knowledge of the sample gas composition is necessary for the analyzer
configuration. Measurement results can be greatly distorted by interfering
components in complex (non-binary) gas mixtures.
Temperature
influence
At each point in the measurement range:
≤
1 % of span per 10 °C, based on temperature during calibration;
Ambient temperature in permissible range, thermostat temperature = 60 °C
Air pressure influence
No effect in permissible operating condition range
Power supply
influence
24 VDC
±
5 %:
≤
0.2 % of span
Position influence
< 1 % of span up to 10° deviation from horizontal orientation
T
90
time
Typical
T
90
= 10 to 20 sec.; Option: T
90
< 6 sec.
(applies to a gas analyzer with one analyzer module)
