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Mettler Toledo M800 Transmitter
Multi-Parameter, Multi-Channel Transmitter
Touch the Future
for pH, Oxygen, Ozone, Flow, CO2, Conductivity, TOC, Flow and Turbidity
Intelligent and intuitive
The M800 transmitter series features premium Intelligent Sensor Management (ISM®) technology measuring
pH/ORP, optical DO, amperometric and optical Oxygen (DO as well as O2 gas), Dissolved Carbon Dioxide,
Conductivity and in some models – Dissolved Ozone, Total Organic Carbon (TOC) and Flow. The multi-parameter
transmitter accepts any compatible combination of sensors. In addition to this the mixed-mode
capability of the M800 1-channel allows the connection of analog or digital ISM sensors. Up to 4 channels
of process measurement provides immediate Plug & Measure installation and operation, predictive sensor
maintenance and dynamic lifetime status. Thanks to iMonitor, the maintenance conditions of the measuring
loop are observed and displayed comprehensively for preventative action. The color touchscreen ensures
intuitive operation, with user selectable control and alarm management for complex applications.
–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

Electrical specifications


Power requirements

100 to 240 V AC or 20 to 30 V DC, 10 W,

AWG 16 – 24, 0.2 mm2 to 1.5 mm2

PE connection

(stainless steel versions)

AWG 18, 0.8 mm2


50 / 60 Hz

Analog output signals

8 x 0 /4 to 20 mA outputs, 22 mA alarm, galvanically isolated from input and from earth / ground

Measurement error through analog outputs

< ± 0.05 mA over 0 to 22 mA range

Analog output configuration

Linear, Bi-linear, Logarithmic, Autoranging


max. 500 Ω

Connection terminals

Spring cage terminals appropriate for

AWG 16 – 24, 0.2 mm2 to 1.5 mm2 wires

Digital communication

USB port, Type B connector

PID process controller

2 x PID with pulse length, pulse frequency or analog control output


Cycle time

Ca. 1 s

Digital input

–1-channel version: 4

–2-channel version: 5

–4-channel version: 6

with switching limits,

0.00 VDC to 1.00 VDC for low level,

2.30 VDC to 30.00 VDC for high level

Analog inputs

One 4 to 20 mA input, galvanically isolated from other signals

Measurement error through

analog input

< ± 0.05 mA over 0 to 22 mA range

Main fuse

2.0 A slow Blow type FC, not replaceable


–4-SPST mechanical rated at 250 VAC, 3 A

(Relay 1 NC, Relay 2 to 4 NO)

–4-SPST Type Reed 250 VAC or DC, 0.5 A (Relay 5 to 8)

Alarm relay delay

0 to 999 s, selectable

User interface

–TFT color touchscreen 5.7"

–Resolution 320  240 px

–256 colors

Input signal

Pulses: low < 1.0 V; high > 1.4 V (max. 36 V)


± 1 digit, ±0.5 Hz


± 0.2 Hz

Hold input


Environmental specifications


Polycarbonate (PC) housing



(housing – H x W x D)

150 x 158 x 170 mm (5.36" x 6.22" x 6.69")

Front bezel – H x W

150 x 158 mm (5.36" x 6.22")

Max. D – panel mounted

125 mm (4.92")


1.6 kg (3.5 lb)


Polycarbonate / PC

Enclosure rating

IP 66, UL Type 4X



Stainless steel housing



(housing – H x W x D)

163 x 163 x 168 mm (6.42" x 6.42" x 6.61")

Front bezel – H x W

163 x 163 mm (6.42" x 6.42")


2.8 kg (6.2 lb)


Stainless steel 304

Enclosure rating

IP 66, UL Type 4X


  • Operation Manual Transmitter M800 Multiparameter
  • Technical Data Transmitters M800 Series
  • Datasheet M800 Transmitter Series
  • Quick Setup Guide Transmitter M800