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About the IMP+ i.s. Level Monitoring System 
 
 
Functional Description 
 
The IMP+ i.s. level monitoring system is a highly developed ultrasonic level 
measurement system which provides non-contacting level measurement for 
a wide variety of applications in both liquids and solids located in hazardous 
areas. It is a 2 wire (loop powered) device.   
 
Easy calibration and maintenance free “fit and forget” performance mean 
that you can install the IMP+ i.s. Level Monitoring System rapidly and with 
confidence. The measured distance, level or space is indicated by the current 
drawn by the unit, fault conditions can be indicated by 3.5 or 22mA. 
 
The IMP+ i.s. operates on the principle of timing the echo received from a 
measured pulse of sound transmitted in air and utilises “state of the art” 
echo extraction technology.  
 
IMP+  i.s. comes in three models IMP 3 i.s. with a range from 0.20m (0.66 
feet) to  3.00m (9.84 feet), IMP 6  i.s. with a range  of 0.3m  (0.98  feet) to 
6.00m  (19.69  feet)  and  IMP  10  i.s.  with  a  range  of  0.3m  (0.98  feet)  to 
10.00m (32.81 feet).