The Mettler Toledo M400 FF 4-Wire is a multi-parameter process transmitter designed to connect compatible analytical sensors with FOUNDATION Fieldbus automation networks.
Its digital communication protocol supports the integration of process measurements and transmitter information into compatible plant control architectures.
Intelligent Sensor Management (ISM) technology provides sensor diagnostics that indicate when compatible sensors may require calibration, maintenance, or replacement.
Plug and Measure functionality also allows sensors to be pre-calibrated away from the process before installation.

Key Characteristics
- Multi-parameter transmitter for compatible pH/ORP, dissolved oxygen, CO2, gas-phase oxygen, and conductivity measurement applications
- FOUNDATION Fieldbus digital communication with a 4-wire power configuration
- ISM predictive diagnostics provide maintenance, calibration, and sensor-replacement indicators
- Plug and Measure functionality supports the use of compatible sensors pre-calibrated in a controlled workshop environment
- AC or DC power options and CE and UL approvals support integration into compatible industrial installations
Ideal Applications
- Process measurement points connected to FOUNDATION Fieldbus automation networks
- Multi-parameter analytical installations using compatible ISM sensors
- Applications requiring digital communication between process instrumentation and control systems
- Installations that benefit from sensor pre-calibration and predictive diagnostic information
- Liquid and gas process measurement applications using compatible Mettler Toledo sensors
Parameters
- Conductivity
- Dissolved CO2
- Dissolved Oxygen
- Dissolved Ozone
- Gas-Phase Oxygen
- ORP
- Optical DO
- pH
Communication
- Foundation Fieldbus
Product Family Includes
- pH and ORP measurement configurations
- Dissolved oxygen, dissolved CO2, and gas-phase oxygen measurement configurations
- Conductivity measurement configurations
Industries Served
- Chemical Processes
- Other Industrial Processes
- Other Water Processes
- Pharmaceutical/Life Science Production
- Wastewater







