Vaisala HMP Series, User Manual

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90°
1
2
4
3
Figure 16 Duct installation overview
1 Make sure there is a minimum clearance of 5 m (16.5 ft) between the probe head and any
possible humidifier. Avoid installing in a location where condensation can fall on the probe
head inside the duct.
2 Maximum air flow speed: 50 m/s.
3 Avoid installing the probe in dead legs. Supersaturation can occur in areas where there is
no air flow.
4 Install the probe head in a 90° angle to prevent condensation from travelling to the sensor
along the mounting pipe. Position the sensor as close to the middle of the duct as
possible.
4.9.3 Mounting HMP9 probe head with Duct Installation Kit
1. Loosen the sealing gland on the back of the pipe by turning it 1.5 full rotations. Do not
detach the gland to avoid dislocating the sealing ring.
HMP Series with MMP8 and TMP1 User Guide M212022EN-F
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