Huba Control FOR FINE PRESSURE AND FLOW MEASUREMENT Level pressure sensing transmitter type 681 Pressure range 0 ... 0.1 - 25 bar Mechanically protected diaphragm due to special head design Supplementary weight (option) improves stabilization of sensor in turbulent media Effective overload protection due to chemically etched chip diaphragm and specially designed glass gland Compact construction using SMD technology, enhances operational reliability in the presence of shock and vibration Welded construction provides 100% sealing against media The pressure transmitters of type 681 with piezoresistive measuring elements have compensated, calibrated and amplified sensor signals which are available as standard voltage or current outputs. In the immersion-sensor version with a salt water and oil-resistant connection cable they are specially suited for level measurement, even in the presence of corrosive liquids. The cable incorporates a tube for compensation of the ambient pressure. Manufactured from stainless steel, its welded construction provides a watertight seal. Huba Control type 681 - Technical data subject to change - Edition 11/2019 1/4

Absolute_optional available 3x pressure range, min. 3 bar Rupture pressure_ Permissible medium_according order code selection table (other medium on request) Material Diaphragm, case Sealing material Cable Stainless steel 1.4435 (316L) Titanium FPM (other at request) PUR, PE oder teflon Output and power supply 3) 4) 3 wire 2 wire_ output_power supply permissible load 5) >10 kOhm_ >10 kOhm supp', vo°'0a2aA - 9V [Ohm] max. supp', ?0a2aA - 9V [Ohm] max. Ex-version Ex-Admission Standards Electrical connection_ Cable_PUR, PE or teflon (In variable lengths) Tests / Admissions Mechanical load Interference...

colour white yellow brown 1 Other medium on request 2) Other pressure ranges on request 3) II 1G Ex ia IIB/IIC T3...T6 / II 1D Ex iaD 20 IP6x T145...T70 °C 4) For medium temperatur > 50oC, PE or Teflon cable must be used 5) Not available with titan case Huba Control type 681 - Technical data subject to change - Edition 11/2019 3/4

Huba Control SA Succursale France Rue Lavoisier Technopole Forbach-Sud 57602 Forbach Cedex Telephone +33 (0) 387 847 300 Telecopieur +33 (0) 387 847 301 [email protected] Huba Control AG Branch Office United Kingdom Unit 13 Berkshire House County Park Business Centre Shrivenham Road Swindon Wiltshire SN1 2NR Phone +44 (0) 1993 776667 Fax +44 (0) 1993 776671 [email protected] 4/4 Huba Control type 681 - Technical data subject to change - Edition 11/2019