
Transmitter M400 21
© 02 / 2010 Mettler-Toledo AG, CH-8606 Greifensee, Switzerland Transmitter M400
Printed in Switzerland 52 121 378
4.3 Connector PIN denition
4.3.1
TB1 and TB2
Power connections are labeled
– N for Neutral and + L for Line, for 100 to 240 VAC or 20–30 VDC.
TB2 for
1
⁄
2
DIN
1 AO1+
2 AO1–/AO2–
3 AO2+
4 AO3+
5 AO3–/AO4–
6 AO4+
7 DI1+
8 DI1–/DI2–
9 DI2+
1 NO1
2 COM1
3 NC1
4 NO2
5 COM2
6 NC2
7 COM5
8 NC5
9 COM6
10 NO6
11 NO3
12 COM3
13 NO4
14 COM4
TB2 TB3
TB4
TB1
1 14
1 9 1 9 1 9
TB1 for
1
⁄
2
DIN
NO: normally open (contact open if un-actuated). AO: Analog Output
NC: normally closed (contact closed if un-actuated). DI: Digital Input
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NOTE: This is a 4-wire-product with an active 4–20 mA analog output.
Please do not supply to Pin1–Pin6 of TB2.
4.3.2 TB3 – Analog resistive 2-e conductivity sensors
Pin no. Sensor wire color* Function
1 white Cnd inner 1
2 white / blue Cnd outer 1
3 blue Cnd inner 2
4 black Cnd outer 2 / Shield
5 – not used
6 bare shield RTD ret / GND
7 red RTD sense
8 green RTD
9 – +5 V
* Transparent not connected.
Terminal 4 and 6 are internally connected, either terminal can be used to connect a wire.
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