IMP+ INSTRUCTION MANUAL 
 
30 
P106 Span 
This parameter should be set to the maximum distance from the Empty 
Level (P105) to the maximum material level. It is automatically set to be 
equal to the Empty Level (P105) less the Near Blanking distance (P107) 
when you set the empty level. Default IMP 3 = 2.80m (9.19 feet), IMP 6 = 
5.70m (18.70 feet) and IMP 10 = 9.70m (31.82 feet). 
P107 Near Blanking Distance 
This parameter is the distance from the face of the transducer that is not 
measurable and is pre-set to the minimum value dependant on the version 
of IMP+ being used. It should not be set to less than this figure but can be 
increased. 
 
P107 Near Blanking Distance 
This is the distance (as a percentage of empty level) beyond the empty 
point that the unit will be able to measure, and the default is pre-set to 10% 
of the empty level.  
If the surface being monitored can extend beyond the Empty Level (P105) 
then the far blanking distance can be increased to a maximum of 100% of 
empty level. 
This parameter is always entered as a % of empty level.