
Transmitter M300 26
© 12 / 11 Mettler-Toledo AG, CH-8606 Greifensee, Switzerland Transmitter Multiparameter M300
Printed in Switzerland 52 121 389
4.3.5 TB3andTB4*for1/2DINand1/4DINversions–
DissolvedOxygenSensor58037221only
(ThorntonModelsonly)
This sensor uses 58 080 25X series cables.
Pinno. SensorwireColor Function
1 white Signal
2 white/blue, Range
3 –
4 black, bare shield Shield, Ground
5 –
6 Transparent Ground
7 Red Temperature
8 Green Temperature
9 Blue +5V
* Only on dual channel version.
Terminal 4 and 6 are internally connected, either terminal can be used to connect a wire.
4.3.6 TB3/TB4*–
ISM(digital)SensorsforpH,Conductivityand
DissolvedOxygen
The wiring of the digital 9 terminal connectors is:
pH,Oxygen,Cond4-e Cond2-e***
Pinno. Function Color Color**
1 24 VDC – –
2 GND (24 VDC) – –
3 1-Wire transparent (cable core) –
4 GND (5 VDC) red (shield) –
5 – – –
6 GND (5 VDC) – white
7 RS485-B – black
8 RS485-A – red
9 5 VDC – blue
* Only on dual channel version
** Bare wire not connected
*** For Thornton models only
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