Vaisala DEWCAP DM500 Guide de l'utilisateur télécharger pdf (Page 31)

Chapter 4 _________________________________ General Information About Sampling and Results

VAISALA _______________________________________________________________________ 29

The Effect of the Sample Gas Flow Rate on

Cooling Capacity and Result Deviation

The cooling effect of the gas flow rate is

shown in Figure 9 (on the right). Low flow

rate increases cooling capacity but also

increases response time.

-79

-78

-77

-76

-75

-74

-73

-72

0 0.5 1 1.5 2 2.5

Flow l/min

Tsensor /C

Figure 9 Effect of Sample Flow Rate on Lowest

Achievable Sensor Temperature

The sample flow rate has an effect on the

deviation of the measurement results as

shown in Figure 10 (on the right).

Sample flow rate range: 0.5...1.5 slpm.

Recommended sample flow rate: 1.0 slpm.

-0.2

-0.15

-0.1

-0.05

0.05

0.1

0.15

0.2

0.5 0.75 1 1.25 1.5

flow/slpm

deviation/°C

Figure 10 Effect of Sample Flow Rate on

Dewpoint Measurement at -60 ºC

1 2 ... 26 27 28 29 30 31 32 33 34 35 36 ... 137 138

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Vaisala DEWCAP DM500 Guide de l'utilisateur Page 31