HD31
- 31 -
V1.6
sented by the flap, while the remaining flow proceeds at maximum speed. In this case, a chan-
nel having a length of about the double of the grill diagonal should be placed temporarily in front
of the grill and measurements should be taken at the channel’s end. The section to be consid-
ered for flow calculations will be that of the temporary channel placed between grill and probe.
D
L = 2 x D
Fig. 4.5.1: flow measurement in the presence of vent grills or diffusers
4.5.3
H
OT
-
WIRE AIR SPEED PROBES
AP471S...
AP471 S1 and AP471 S3 probes measure incident air flows up to 40 m/s; AP471 S2 and
AP471 S4 probes, equipped with omnidirectional sensor, measure air speed up to 5 m/s in any
direction of the air flow incident on the probe. Air speed measurement temperature is compen-
sated in the range 0…+80 °C.
AP471 S4 probe is provided with supporting base and sensor protection.
AP471S1
AP471S2
AP471S3
Temporary channel
Probe
Duct section
Ventilation grill
DUCT
Flexible
Содержание HD31
Страница 6: ...HD31 6 V1 6 2 DESCRIPTION Fig 2 1 instrument description...
Страница 149: ...HD31 149 V1 6 NOTES...
Страница 150: ...HD31 150 V1 6 NOTES...
Страница 151: ......