5 LIEBERT® SN™ SENSOR INSTALLATION (OPTIONAL)
The RPC2 module is designed to monitor Liebert® SN™ integrated and modular sensors:
• Integrated sensors are attached to a single cable. These Liebert® SN™ sensors are available in several varieties,
including single or multiple temperature sensors.
• Modular sensors are separate probes shipped with a cable for connection to the RPC2 communications module.
• Liebert® SN™ sensors can be connected in a string, including a combination of modular and integrated sensors.
• The maximum string length is 65.6 ft. (20 m).
• The maximum number of probes that can be connected to a Vertiv™ MPH™ or MPX™ is 10. Refer also to the
quick-start guides for integrated (SL-20840) and modular (SL-52405) sensors. See the sensor quick-start
guides for details on the number of probes in each type of sensor. Liebert® SN™ sensors can be placed in any
area, for example, in a Knurr® rack, to monitor conditions such as temperature and humidity levels or the state
of a contact.
5.1 Record the Sensor Address
During configuration, the web interface displays the addresses of all connected sensors. You need to be able to identify
which address belongs to each sensor. Be sure to make a note of each sensor’s address before mounting and connecting
sensors. The sensor address can be found on the sensor itself (modular sensors) or the RJ45 end of the sensor cable
(integrated sensors).
5.2 Mount the Sensor
The sensor may be mounted in a Vertiv™ rack or another type of rack. For temperature and humidity sensors, be sure to
choose a place with unobstructed airflow, for example, on the rack door. Check to make sure the sensor does not cover any
vents that might impede airflow.
Search for Liebert®SN™ Sensors at www.VertivCo.com and refer to the modular or integrated sensor quick-start guide for
detailed instructions on each of the following four options:
• Mount on a Knurr rack frame or 19-inch rail
• Mount the sensor on the rack door
• Mount the sensor on a flat surface
• Mount the sensor on the rack rails
5.3 Connect the Sensor
Each sensor is shipped with a cable to connect to the Liebert® SN™ port on your Liebert® product. The RPC2 must be
installed before the sensor can be connected.
ICON NAME DESCRIPTION
Liebert® SN™Port Use this port ONLY to plug in optional sensor accessories.
Table 5.1 Liebert® SN™ Port Description
To connect the sensor:
1. After securely mounting the sensor, determine the location of the Liebert® SN™ port, identified by the icon in
the previous table.
2. Insert the RJ45 connector end of the sensor cable into the Liebert® SN™ port on the Liebert® product.
NOTE: When adding sensors to a string, disconnect the entire string from the sensor port and wait one minute, then
reconnect the string to the port. When the string is reconnected to the sensor port, all information is retained for
sensors existing in a string prior to adding the new sensor.
Vertiv | RPC2™ Communications Module Installer/User Guide | 45
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