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Mettler Toledo

M800 Multi-Parameter Transmitter

For measurement of pH/ORP, optical DO, amperometric oxygen, conductivity, resistivity, TOC dissolved ozone, flow, and turbidity

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The M800 multi-parameter transmitter provides simultaneous monitoring of one, two, or four in-line sensors for measurement of pH/ORP, optical DO, amperometric oxygen (DO as well as O2 gas), conductivity, resistivity, TOC dissolved ozone, flow, and turbidity, in pure water as well as process applications.

ISM features available on all M800 models include Plug and Measure for fast sensor installation and start up, predictive maintenance information, and dynamic sensor lifetime status. Thanks to the iMonitor display, the condition of each sensor is determined at a glance allowing preventive action to be taken before processes are affected. The color touchscreen provides intuitive operation, with user selectable control and alarm management for challenging applications.


Simple operation through intuitive user interface
Thanks to the intuitive menus and touchscreen display, all operations from installation to system diagnostics are greatly simplified. Minimum training effort and easy handling ensure maximum convenience and minimum errors.

Lower cost of measurement point
One unit covers the whole range of major parameters for either process or water applications. Up to four sensors can be monitored with a single M800, significantly reducing installation costs and cost per measurement point.
Predictive diagnostics and improved maintenance management
The unique iMonitor concept allows you to monitor the actual status of every sensor at a glance and offers predictive maintenance information to improve maintenance management and avoid unplanned production shutdowns.

• Multi-parameter measurement
• 1-channel / 2-channel / 4-channel versions (plus 2 flow inputs in some models)
• Premium ISM functionality
• Mixed-mode for M800 1-channel
• iMonitor for predictive maintenance
• Color touchscreen with an intuitive user interface
• User management and logbook
• Graphic trending
• 4-wire installation
• Eight 0/4 … 20 mA current outputs, self powered, galvanically isolated
• Eight freely configurable relays
• IP 66 rated / UL Type 4X
• 10 languages: English, German, French, Italian, Spanish, Portuguese, Russian, Japanese, Korean and Chinese

ISM Plug and Measure, advanced diagnostics tools (DLI, ACT, TTM), iMonitor
Current outputs 4 or 8 depending on model
Protection IP66, DIN
Approvals FM CI1 Div2, UL
Digital Inputs 4 6 depending on model
Analog Input 1
User Interface Color touchscreen 5.7" TFT, 320 x 240 pixel, 256 colors
Current Output 8
Service Interface USB port
Power supply 100 to 240 V AC, or 20 to 30 V DC, 12 VA
Relays 8
Password Protection Yes