
Transmitter M400 25
© 02 / 2010 Mettler-Toledo AG, CH-8606 Greifensee, Switzerland Transmitter M400
Printed in Switzerland 52 121 378
4.3.9 TB4 – ISM (digital) sensors for pH,
conductivity and oxygen
The wiring of the digital 9 terminal connectors is:
Optical Oxygen pH, amp. Oxygen, Cond 4-e
Pin no. Function Sensor wire color Sensor wire color
1 24 VDC brown –
2 GND (24 VDC) black –
3 1-Wire – transparent (cable core)
4 GND (5 VDC) grey and yellow red (shield)
5 – – –
6 GND (5 VDC) – –
7 RS485-B blue –
8 RS485-A white –
9 5 VDC – –
– ISM digital sensors can only be connected on TB4.
– Analog sensors can only be connected on TB3.
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