Transmitter AMU-II pH/Redox AC


Measuring and control transmitter for panel installation in a Noryl® resin enclosure (front IP 54).


Sensors: Connections for a pH or ORP sensor with integrated or separate reference electrode, for a Pt1000 temperature sensor, and for a digital sample flow meter.


Measuring range: 

  • 0 to 14 pH or -500 to +1500 mV
  • Automatic temperature compensations according to Nernst with or without correction functions
  • Measured value is compensated to 25 °C.


User interface:

  • Big backlit LC display for measuring value, sample temperature, sample flow and operating status
  • Easy user menus in English, Chinese, German, French and Spanish. Simple programming of all parameters by keypad
  • Data logger for 3’500 data records stored at a selectable interval.   



  • 2 signal outputs (0/4 - 20 mA) for measured values or continuous control
  • 2 potential-free contacts as limit switches or as controllers, configuration normally open
  • 1 potential-free alarm contact as summary alarm indication, selection NC (normally open) or NO (normally closed) via terminal
  • 1 input for potential-free contact for hold or remote-off function
  • 1 serial interface RS232 (for logger/history download and firmware updates via optional USB converter)
  • All in- and outputs protected against overvoltages.   


Communication Options:  

  • Profibus DP / Modbus RTU interface or  
  • HART interface or  
  • USB interface (for data logging and firmware updates)    


Power Supply: 

  • AC version: 100 - 240 VAC (+/- 10 %), 50/60 Hz (+/- 5 %) 
  • DC version: 10 - 36 VDC    


Dimensions: 96 x 96 x 85 mm (DIN 43700)