Qualitrol 509ITM Series, Manual

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a closed contact signifies a shorted connection across the contacts. This can be used, for
example, to monitor pumps or fans. The system internally treats closed and opened contacts
as either a 0 or 100 numeric value. Therefore, if the module is used to control a relay, the
relay set point should be set at midrange, e.g., 50.
This module can monitor a non-powered, dry contact.
Powered Contact Closure Module
The Powered Contact Closure Module is used to monitor a powered contact, and it indicates
on the display whether it is opened or closed. An open means there is no connection
between the contacts, and closed indicates a shorted connection across the contacts. This
can be used to monitor alarms or active fans, for example. The system internally treats
closed and open contacts as either a 0 or 100 numeric value. Therefore, if the module is
used to control a relay, the relay set point should be set at midrange, e.g., 50.
The module will register a powered contact of >80 V AC/DC or >130 V AC/DC jumper
selectable as an Open; and a voltage of <50 V AC/DC or < 85 V AC/DC jumper selectable
as Closed.