SCHMIDT Technology
  Description Article-Number
Basic sensor SCHMIDT® Flow Switch SS 20.200; protective coating 504 475 - X Y S N xx
SCHMIDT® Flow Sensor SS 20.200; with swichting output, cable length 2 m, with protective coating 505 504 - X Y S N xx
  Options
Mechanical Type Sensor length 100 mm   1      
Sensor length 200 mm   2      
Sensor length 350 mm   3      
Sensor length 500 mm   4      
Measuring ranges and calibration Measuring range 0 … 1 m/s     1    
Measuring range 0 … 2,5 m/s     2    
Measuring range 0 … 10 m/s     3    
Measuring range 0 … 20 m/s     4    
Signalization relais / LED Flow velocity wN threshold: relais closes / LED on       1  
Flow velocity wN threshold: relais opens 1) / LED on       2  
Flow velocity wN threshold: relais closes / LED on       3  
Flow velocity wN threshold: relais opens 1) /LED on       4  
Setting threshold With setting potentiometer, without pre-setting         P 00
With setting potentiometer, selectable pre-setting from 5 up to 95% of measuring range         P 05 … 95
Selectable pre-programming (not changeable) from 5 up to 95% of measuring range         F 05 … 95

The configuration "open relay" in case of an alarm is called a "fail-safe" because both a power failure and a cable break can be signalized as an alarm as well.