Chapter 3 ________________________________________________________________ InstallationVAISALA ________________________________________________________________________ 25WiringFor a secure connection to the probe, connect to the 4-pin M8 connectorusing a threaded connector.The grounding method depends on the probe and the installation type.See Table 4 below.Table 4 Grounding MethodsProbe Grounding methodHMP63 and HMP113 It is recommended to use a shielded cable andconnect the shield to ground.In the shielded cables supplied by Vaisala, thethreaded connector connects the shield to theprobe housing.HMP60, HMP110,HMP110D, HMP110T,HMP110REFThere are two ways to ground the probe dependingon installation type. Choose only one of theseways:- Grounding is provided by the metal cover ofthe probe. If using shielded cables, shield isNOT connected to ground.- A shielded cable is used, and the shield isconnected to ground. In the shielded cablessupplied by Vaisala, the threaded connectorconnects the shield to the probe housing.0912-104Figure 20 Wiring of Analog Output0912-105Figure 21 Wiring of Digital Output
