M420 Transmitter Series - Overview - METTLER TOLEDO

M420 Transmitter Series - Discontinued Product

For hazardous area applications

The M420 transmitter series stands for reliability in loop-powered applications. When your process requires the highest safety level for pH, oxygen and conductivity  measurement, the M420 brings you the best performance and the advantages of the state-of-the-art ISM technology* for efficient maintenance.

Discontinued since: Dec, 2016

Replaced with: Transmitter M400 2-wire, Chemical

For Hazardous Area Applications

Intelligent Sensor Management (ISM), global hazardous area approvals and the rugged design of the M400 2-wire transmitter series provide outstanding operating reliability and process safety. These features ensure the M400`s suitability for use across the chemical industries. Easiest handling and on-site or remote access over HART to advanced ISM predictive diagnostics tools leads to reduced operating costs and increased process uptime.

The M400 2-wire transmitter is a single-channel, multi-parameter unit for pH / ORP, oxygen and conductivity measurement. Thanks to the mixed-mode input, which allows the use of analog or ISM sensors, the M400 2-wire offers a unique and smooth transition from analog to digital technology.


Documentation - M420 Transmitter Series


Application Note: pH Control in Sour Water Stripping
In petroleum refining, so called sour water (process water that contains dissolved hydrogen sulfide – H₂S) is produced in various processes. Due to en...
Application Note: Gas-Phase Oxygen Sensors For Reduced Risk of Explosion
In a safety critical application the InPro6850i G was mounted directly into a reactor to protect the process from explosion. No sampling probes or ela...
In-line O2 Measurement for Inertization Control
For safety reasons, some chemical reactions take place in an inert gas environment where the amount of oxygen present is tightly controlled. The METTL...
Oxygen Control in Gas Phase for Safely Recovering Flammable Solvents
Fast response, high reliability and minimal downtime were paramount for measuring gas-phase oxygen in the headspace of metal barrel shredders and in a...
Ensuring Safety in Reactor and Centrifuge
Critical reaction and extraction stage in an API production process can be ensured safe with inline gas-phase oxygen sensing technology which eliminat...
Application Note: Measure Oxygen Where it Really Matters
Performance of gaseous oxygen measurement is now redefined with METTLER TOLEDO’s amperometric systems. They not only allow reliable and stable measure...

Accessories - M420 Transmitter Series

Specifications- M420 Transmitter Series

Specifications - M420 Transmitter Series
ISM Plug and Measure™, DLI, ACT
Protection IP 67
Approvals CE, ATEX / IECEx / FM/CSA, Zone 1 / Cl I Div 1 (pending)
Temperature range - 20 °C to 65 °C (- 4 °F to 149 °F)
Digital Input/Output optional: HOLD and CONTROL
User Interface LC display, 7 segment with icons, backlit (white)
Current Output 2nd passive current output optional
Service Interface IrDA
Communication HART
Short description for pH, O2, conductivity
Parameters pH/ORP, DO, O2 gas, conductivity
Communication HART®
Hazardous Area Classification ATEX, IECEx, CSA, FM
Sensor Type Analog or ISM
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