Add item into Primefaces table - jsf

Question

I want to add item into Primefaces table when I create new item. I managed to create this code:
<h:form id="new_item_button">
<p:commandButton id="ajax" value="New Sensor" styleClass="ui-priority-primary" onclick="PF('dlg').show();" type="button"/>
</h:form>
<h:form id="new_sensor">
<p:dialog header="New Sensor" widgetVar="dlg" focus="name" modal="true" showEffect="fade">
<h:panelGrid columns="2" cellpadding="5">
<h:outputLabel for="name" value="Name" />
<p:inputText id="name" label="name" value="#{newSensor.sensor.name}" />
.............................
</h:panelGrid>
<f:facet name="footer">
<p:commandButton id="ajax" value="Create Sensor" actionListener="#{newSensor.saveRecord()}" update=":new_sensor"/>
</f:facet>
</p:dialog>
</h:form>
<h:form id="form">
<p:dataTable id="tbl" var="sensor" value="#{sensors.systemSensors}"
.......
paginator="true" rows="12"
rowKey="#{sensor.model}">
<p:column headerText="Name" sortBy="#{sensor.name}" style="text-align: center">
<h:outputText value="#{sensor.name}" />
</p:column>
...................
</p:column>
</p:dataTable>
Beans:
#Named
#RequestScoped
public class Sensors implements Serializable
{
private List<SensorObj> sensors;
#PostConstruct
public void init()
{
sensors = generateSensors();
}
public List<SensorObj> getSystemSensors()
{
return sensors;
}
private List<SensorObj> generateSensors()
{
List list = new ArrayList();
SensorObj obj1 = new SensorObj("Sensor 1", "SBS0212", "Online", true, null);
list.add(obj1);
return list;
}
}
#Named
#RequestScoped
public class NewSensor implements Serializable
{
private SensorObj sensor = new SensorObj();
public SensorObj getSensor()
{
return sensor;
}
public void setSensor(SensorObj sensor)
{
this.sensor = sensor;
}
public void saveRecord(){
.....
}
}
When I submit the dialog with the new sensor I want to update the table. How I can implement this?
Should I use one managed bean for listing the content and adding new items or as it is it's better to use two?