Onset Computer Corporation
HOBO U14
18
User’s Guide
Wiring Diagrams
NOTE
: All drawings show the logger in the Normally Closed state with the Alert inactive.
The HOBO U14’s contact closure is initially set at the factory to be Normally Closed, but you can change this in HOBOware to
accommodate Normally Open devices (see the ARA User’s Manual).
Avoiding False Alerts
If the alert output is connected to a remote alarm configured for Normally Closed inputs you can avoid false alarms when the logger is
disconnected by making a temporary connection between the wires going to the remote alarm. Be sure to disconnect this temporary
connection when the logger is reconnected to the remote alarm wires.
HOBO U14 with Onset’s ARA Remote Alarm
NOTE
: The polarity of the connections to the logger does not matter.
HOBO U14 with Onset’s AVD-45 Automatic Dialer
NOTE
: The polarity of the connections to the logger does not matter.
