Below is an example of what I have to do to get rid of tons of OutOfRange Temperature o rVoltage Sensors Alerts:
First Stop daemon
  /etc/init.d/dmgtd stop
Modify
the entry (please note the highlighted part)for my devices in oid2type_cisco.conf
file (<NMSROOT>/objects/smarts/conf/discovery/oid2type_cisco.conf) 
as shown below:
#
Cisco Nexus 7000
 .1.3.6.1.4.1.9.12.3.1.3.612
{
   
TYPE = Switch
   
VENDOR = Cisco
   
MODEL = N7K-C7010
   
CERTIFICATION = CERTIFIED
   
CONT = Cisco-EntityRF-Switch
   
HEALTH = Nexus-Entity-EntSensor
   
BRIDGE = Cisco
   
NEIGHBOR = Cisco-Cdp
INSTRUMENTATION:
    
Environment                    
= CiscoEntityFRU:DeviceID
   
Card-Fault                     
= CiscoEntityFRU:DeviceID
   
CPU/Memory                     
= CiscoSystem:DeviceID
    
Interface-Fault                
= MIB2
   
Interface-Performance          
= MIB2
   
Port-Fault  
                   =
MIB2
   
Port-Performance               
= MIB2
}
# Cisco ASR Router - 1004
.1.3.6.1.4.1.9.1.924 {
TYPE = Router
VENDOR = Cisco
MODEL = ASR1004
CERTIFICATION = TEMPLATE
CONT = Cisco-EntityFRU
NEIGHBOR = Cisco-Cdp
HEALTH = Cisco-Router-CRS-EntSensor
INSTRUMENTATION:
Environment = CiscoEntityFRU:DeviceID
CPU/Memory = CiscoRouter:DeviceID
Card-Fault = CiscoEntityFRU
Interface-Fault = MIB2
Interface-Performance = CiscoRouter
Interface-Ethernet-Performance = CiscoRouter_Ethernet
} 
# Cisco VSS Switch 
.1.3.6.1.4.1.9.1.896 {
    TYPE = Switch
    VENDOR = Cisco
    MODEL = VSS-1440
    CERTIFICATION = CERTIFIED
    CONT = Cisco-VSS-Switch
    VLAN = Cisco-Membership
    BRIDGE = Cisco
    NEIGHBOR = Cisco-Cdp
    HEALTH = Cisco-Router-CRS-EntSensor
INSTRUMENTATION:
    Environment                         = CiscoEntityFRU:DeviceID
    CPU/Memory                          = CiscoRouter:DeviceID
    Card-Fault                          = CiscoEntityFRU:DeviceID
    Interface-Fault                     = MIB2
    Interface-Performance               = MIB2
    Port-Fault                          = MIB2
    Port-Performance                    = MIB2
    Port-Ethernet-Performance           = dot3_Ethernet
}
Restart daemon
  /etc/init.d/dmgtd start
Re-discover the devices