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Chapter 10
Appendix: Specifications
10.1
Specification of Thermal Conductivity Measurement
Attribute
Range / Precision
Linearity
< 1 % of range
Warm up time
Approx. 20 min; up to 1 h for
small measuring ranges
Flow rate
10 l/h - 150 l/h,
60 l/h - 80 l/h (recommended)
T90-time
< 1 sec at flow rate higher 60 l/h
(or dependant on user selected
T-90-filter time)
Noise
< 0.5 % of smallest range
Drift at zero point
< 2 % of smallest range per
week
Repeatability
< 1 % of range
Error due to change of ambient temper-
ature
< 1 % of smallest range per
10 K temperature change
Error due to change of flow at 80 l/h
< 1 % of smallest range per
10 l/h
Error
due
to
change
of
pressure
(800 hPa < p < 1200 hPa)
< 1 % of smallest range per
10 hPa
Table 10.1: Specification of TC measurement
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