SCHMIDT
®
Flow Switch
SS 20.200
Instructions for Use
Page 1: ...SCHMIDT Flow Switch SS 20 200 Instructions for Use ...
Page 2: ...mation 3 2 Application range 3 3 Mounting instructions 4 4 Electrical connection 6 5 Commissioning 7 6 Switching threshold 8 7 Service information 9 8 Technical data 10 9 Certificate of conformity 11 Imprint Copyright 2016 SCHMIDT Technology All rights reserved Version 505518 01C Subject to modifications ...
Page 3: ... the delivery performance or use of this unit Symbols used in this manual The symbols used in this manual are explained in the following section Danger warnings and safety instructions read them care fully Non observance of these instructions may lead to injury of the personnel or malfunction of the device 2 Application range The SCHMIDT Flow Switch SS 20 200 has been designed for station ary use ...
Page 4: ... heat sources since this may result in measurement errors When used in ventilation pipes equipped with heat exchangers the sensor should always be mounted upstream of the heat exchanger Wall mounting First the protective cover must be pulled off the sensor head Then the sensor together with the threaded piece M 18 x 1 fine pitch thread is screwed in the appropriate threaded bore of the duct wall S...
Page 5: ...b ances opposite to the flow direction L1 L2 L D L Total length of measuring distance L2 Length of run out distance L1 Length of run in distance D Diameter of the measuring distance The following table shows the necessary straight conduit lengths as a function of the pipe diameter D for various scenarios Flow obstacle upstream of measuring conduit Minimum length of run in distance L1 Minimum lengt...
Page 6: ...ble assignment The sensor is equipped with a cable firmly fixed to its housing with 2 m length and open cable ends pin assignments see following graphic Sensor 24V R1 RON R2 Gnd WH white YE yellow GN green Z During electrical installation ensure that no voltage is applied and inadvertent activation is not possible For signalling a semiconductor relay is used Its galvanically decoupled switching ou...
Page 7: ...Switching threshold1 underrun exceeded Closed Open Sensor ready Switching threshold3 exceeded underrun Open Closed Legend LED off LED flashing 2 Hz LED on Startup Before switching on it must be checked if the SS 20 200 is installed cor rectly both mechanically and electrically The sensor is ready within 20 s after applying the operating voltage During this initialisation stage the green LED is fla...
Page 8: ...nge The individual setting of the switching point is done by adjusting the flow velocity to the desired threshold value Then the potentiometer is rotated from the zero point clockwise until the relay is switching The release point is then offset downward by the hysteresis see also chapter Hyste resis of switching threshold For fine adjustment the potentiometer can now be rotated back a little bit ...
Page 9: ...sor head is a sensitive measuring system During manual cleaning proceed with great care Before putting it again into operation wait until the sensor head is com pletely dry Sterilization Both uncoated and coated sensors can be sterilized during operation Alcohols drying without leaving residues and hydrogen peroxide un coated version only are approved and certified disinfectants Spare parts or rep...
Page 10: ...r probe 20 85 C Electronics 20 70 C Storage temperature 20 85 C Humidity range 0 95 of rel humidity RH none condensing Operating pressure 0 10 bar overpressure Operating voltage UB 24 VDC 20 Current consumption typ 40 mA max 70 mA 5 Switching relay 30 VPeak 100 mA 300 mW Display LED Green sensor status Red switching status sensor defective Electrical connection Non detachable cable pigtail6 4 x 0 ...
Page 11: ...Instructions for Use SS 20 200 Page 11 9 Certificate of conformity ...
Page 12: ...uctions for Use SS 20 200 Page 12 SCHMIDT Technology GmbH Feldbergstraße 1 78112 St Georgen Germany Phone 49 0 7724 899 0 Fax 49 0 7724 899 101 Email sensors schmidttechnology de URL www schmidt sensors com ...
