Catalogues - sdp1108-differential-pressure-sensor

Catalogue SDP1108 Differential Pressure Sensor

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5EN5IRION

THE SENSOR COMPANY

4.3 Connecting Hose

Sensirion recommends a hose with an inner diameter of 1/8 to 3/20 inch (3.18 to 3.8mm). Due to the dynamic measurement principle, a small air flow is required (Figure 6) which

leads to a dependence on the length of the hose (Figure 7). Tubes up to 1 m show less than 1 % error of the measured value (Figure 7).

« 350 -

° 300 -


	Length of the connecting hose	Deviation of Measured Value
	0.5 m (20 inch)	- 0.4 %
	1.0 m (40 inch)	- 0.8 %
	2.0 m (80 inch)	-1.6%
	4.0 m (160 inch)	- 3.2 %

5 150 4

a. 100 -------------------------------\ \

I 50 -------------i

<=> 0 Y^--\-\-

0 30 60 90

Mass flow through SDP1108 [seem] Figure 6: Typical air flow through the SDP1108. Figure 7: Influence ofthe length ofthe connecting hose on

Please note: 1 scc/min = 1 cm3/min at 0°C and the accuracy (using 3/16 inch inner diameter).

1013 mbar pressure (1 sccm = 0.001 norm liter). Example: a 50 Pa difference pressure is shown as

49.8 Pa when using 0.5 m tube with 3/16 inch diameter.

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SDP1108 - preliminary data sheet v0.95 February 2007

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