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Universal 4-wire, dual-input transmitter

The AWT420 dual-channel transmitter provides true flexibility for measuring a wide variety of parameters in a single device.

Packed with a host of features including Bluetooth® connectivity, dual PID control and EZ-Link sensor connection, water analysis has never been easier.

Fieldbus & HART


The AWT420 transmitter can be used with either analog or digital EZLink sensors for a wide range of applications including drinking water, wastewater, industrial water and power.

Operation simplicity is a key feature of the AWT420 with its powerful, yet intuitive software, advanced self-diagnostics and its unique modular design that enables users to achieve increased efficiency through greater user flexibility, reduced process downtime and simplified maintenance.

With integrated Bluetooth you can securely connect to any iOS or Android device using the EZLink connect app to easily access essential sensor information. From checking your audit logs to downloading the latest software through your smartphone, we are confident that EZLink connect will make your life that little bit easier by providing you with a wealth of information and services to support you wherever and whenever you need it.

  • Plug-and-play universal modular design
  • 'Easy Setup' menus provide step-by-step guidance
  • Multi-level security access prevents unauthorized modification of process control data
  • Secure data archiving to an SD card
  • Direct connection to your smart device
  • HART, Ethernet, PROFIBUS or MODBUS digital communications
  • Wall-, panel- or pipe-mountable





  • Number of sensor inputs
    Up to 2 analog or digital sensors
  • Measurement parameters
    pH/ORP, 2-electrode conductivity, 4-electrode conductivity, optical dissolved oxygen, turbidity/suspended solids
  • Language

    English, German, Italian, Spanish, French, Portuguese, Russian, Turkish, Polish, Chinese

Mechanical data

  • Protection:
    IP66 / NEMA 4X
  • Dimensions:
    144 × 144 × 99 mm (5.67 × 5.67 × 3.89 in)
  • Weight
    Aluminium enclosure: 1.364 kg (2.5 lb)
    Polycarbonate enclosure: 1.0 kg (2.2 lb)


  • Supply voltage
    100 to 240 V AC ±10 %, 50/60 Hz
    24 V DC (18 min. to 36 max.)
  • Power consumption

Analog outputs

  • 2 standard + 2 optional with analog module

Relay outputs

  • 4 standard

Digital input/output

  • 1 standard, user-programmable as input or output

Connectivity/Communications (optional)

  • Ethernet
  • HART

Hazardous area approvals (aluminium enclosure only)

  • Hazloc EZLink channels fitted:
    II 3(3) G Ex ic ec NC [ic Gc] IIC T4 Gc
    – 10 ⁰C </ Ta </ + 45 ⁰C, IP66
    Class I, Div 2, Gps ABCD T4 
    – 10 ⁰C </ Ta </ + 45 ⁰C, IP66
  • No Hazloc EZLink channels fitted:
    II 3 G Ex ice c Nc IIC T4 Gc
    – 10 ⁰C </ Ta </ + 45 ⁰C, IP66
    Class I, Div 2, Gps ABCD T4 
    – 10 ⁰C </ Ta </ + 45 ⁰C, IP66

Marine Approval

  • Lloyd's Register approved for marine applications (category ENV2)
  • Tested according to IACS UR E10, Rev. 7, Oct. 2018

Fieldbus & HART

ABB’s freedom of choice offers the right driver for the major fieldbus protocols suitable for ABB devices. 

The version matrix document shows for each protocol the software revision that’s compatible with the hardware and firmware revision of the device.

Software and documentation:

Stand-alone tool:
ABB offers software tools that use the listed drivers above for your device configuration and monitoring requirements. Read more & download

Fieldbus solutions:
ABB offers a wide range of fieldbus products, accessories, tools, support documentation, applications and news. Read more


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