2. Mettler Toledo
  3. M400 2 wire Wiring Diagram

Mettler Toledo M400 2 wire Wiring Diagram Installation guide

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  • What should I do if the shipping container is damaged?
    How should the transmitter be oriented during installation?
    What is the required power source for all M400 models?
    What needs to be done to maintain IP66 rating when installing cables?
Transmitter M400 2(X)H 18
© 03/2023 Mettler-Toledo GmbH, CH-8606 Greifensee, Switzerland M400 2-Wire
Printed in Switzerland 30 748 687 A
4 Installation Instruction
4.1 Unpacking and Inspection of Equipment
Inspecttheshippingcontainer.Ifitisdamaged,contacttheshipperimmediatelyforinstructions.
Donotdiscardthebox.
Ifthereisnoapparentdamage,unpackthecontainer.Besureallitemsshownonthepacking
listarepresent.
Ifitemsaremissing,notifyMETTLERTOLEDOimmediately.
4.1.1 Panel Cutout Dimensional Information –
½DIN Models
½DINModeltransmittersaredesignedwithanintegralrearcoverforstand-alonewallmount
installation.
Theunitmayalsobewallmountedusingtheintegralrearcover.Seeinstallationinstructionsin
section4.1.2.
Belowarecut-outdimensionsrequiredbythe½DINmodelswhenmountedwithinaflatpanel
oronaflatenclosuredoor.Thissurfacemustbeflatandsmooth.Texturedorroughsurfacesare
notrecommendedandmaylimittheeffectivenessofthegasketsealprovided.
137 mm + 0.5 mm
– 0.0 mm
(5.39" + 0.02")
– 0.00"
PANEL CUT-OUT
137 mm + 0.5 mm
– 0.0 mm
(5.39" + 0.02")
– 0.00"
Optionalhardwareaccessoriesareavailablethatallowforpanel-orpipe-mount.
Refertosection15fororderinginformation.
Transmitter M400 2(X)H 19
© 03/2023 Mettler-Toledo GmbH, CH-8606 Greifensee, Switzerland M400 2-Wire
Printed in Switzerland 30 748 687 A
4.1.2 Installation Procedure
General:
• Orientthetransmittersothatthecablegripsfacedownward.
• Wiringroutedthroughthecablegripsshallbesuitableforuseinwetlocations.
• InorderprovideIP66enclosureratings,allcableglandsmustbeinplace.Eachcablegland
mustbefilledusingacable,orsuitableCableGlandHoleSeal.
For Wall Mount:
• Removerearcoverfromfronthousing.
• Startbyunscrewingthefourscrewslocatedonthefaceofthetransmitter,ineachcorner.This
allowsthefrontcovertoswingawayfromtherearhousing.
• Removethehinge-pinbysqueezingthepinfromeachend.Thisallowsthefronthousingtobe
removedfromtherearhousing
• Mountrearhousingtowall.SecuremountingkittotheM400accordingtothesupplied
instructions.Attachtowallusingappropriatemountinghardwareforwallsurface.Besureitis
levelandsecurelyfastenedandtheinstallationadherestoanyandallclearancedimensions
requiredfortransmitterserviceandmaintenance.Orientthetransmittersothatthecablegrips
arefacingdownward.
• Replacethefronthousingtotherearhousing.Securelytightentherear-coverscrewstoensure
thatIP66/NEMA4Xenclosureenvironmentalratingismaintained.Theunitisreadytobewired.
For Pipe Mount:
• Useonlymanufacturer-suppliedcomponentsforpipe-mountingtheM400transmitterand
installperthesuppliedinstructions.Seesection15fororderinginformation.
4.1.3 Assembly – ½DIN Version
1. 3M20X1.5cableglands
2. Plasticsplugs
3. 4screws
1
2
3
Transmitter M400 2(X)H 20
© 03/2023 Mettler-Toledo GmbH, CH-8606 Greifensee, Switzerland M400 2-Wire
Printed in Switzerland 30 748 687 A
4.1.4 ½DIN Version – Dimension Drawings
4.1.5 ½DIN Version – Pipe Mounting
40 ...
60 mm
1.57...
2.36"
METTLER TOLEDO
M400
150 mm / 5.90"
90 mm / 3.54"
36 mm
1.41"
72 mm
2.83"
150 mm / 5.90"
136 mm / 5.35"
90 mm / 3.54"
75 mm / 2.95"
105 mm / 4,13"
31 mm
1.22"
22 mm
0.87"
137 mm
(+0,5mm/−0,0mm)
5.39"
(+0.02"/−0.0")
137 mm
(+0,5mm/−0,0mm)
5.39"
(+0.02"/−0.0")
Transmitter M400 2(X)H 21
© 03/2023 Mettler-Toledo GmbH, CH-8606 Greifensee, Switzerland M400 2-Wire
Printed in Switzerland 30 748 687 A
4.2 Connection of Power Supply
Allconnectionstothetransmitteraremadeontherearpanelofallmodels.
a Besurepowertoallwiresisturnedoffbeforeproceedingwiththeinstallation.
Atwo-terminalconnectorontherearpanelofallM400modelsisprovidedforpowerconnection.
AllM400modelsaredesignedtooperatefroma14–30VDCpowersource.Refertospecifications
forpowerrequirementsandratingsandsizepowerwiringaccordingly(AWG16–24,wirecross-
section0.2mm2 to 1.5 mm2).
4.2.1 Housing (Wall Mount)
1
2
1: TB1–InputandOutputAnalogSignal
2: TB2–SensorSignal
Transmitter M400 2(X)H 22
© 03/2023 Mettler-Toledo GmbH, CH-8606 Greifensee, Switzerland M400 2-Wire
Printed in Switzerland 30 748 687 A
4.3 Terminal Block (TB) Denitions
TB1
TB2
A Q
1 12 13 18
PowerconnectionsarelabeledA01+ / HART and A01– / HART
resp.A02+ and A02–for14to30VDC.
4.4 Terminal Block TB1
Terminal Designation Description
1V_EC
Easyclean
2GND_EC
3485A_EC
4485B_EC
5DI1+ Digitalinput1
6DI1−
7DI2+ Digitalinput2
8DI2−
9OC1+ Opencollectoroutput1(switch)
10 OC1−
11 OC2+ Opencollectoroutput2(switch)
12 OC2−
13 AO1+/HART • Powerconnection14to30VDC
• Analogoutputsignal1
• HARTsignal
14 AO1−/HART
15 AO2+ • Powerconnection14to30VDC
• Analogoutputsignal2
16 AO2−
17 Notused –
18
Transmitter M400 2(X)H 23
© 03/2023 Mettler-Toledo GmbH, CH-8606 Greifensee, Switzerland M400 2-Wire
Printed in Switzerland 30 748 687 A
4.5 Terminal Block TB2: Analog Sensors
4.5.1 Conductivity (2-e / 4-e) Analog Sensors
Terminal Function Color
A Cnd inner11) White
BCndouter11) White/blue
CCndouter1 –
DNotused –
E Cndouter2 –
F Cnd inner22 ) Blue
GCndouter2(GND)
2) Black
HNotused –
I RTDret/GND Bareshield
J RTDsense Red
KRTD Green
L Notused –
MNotused –
N Notused –
ONotused –
PNotused –
QNotused –
1) For third party Conductivity 2-e sensors a jumper between A and B may be required.
2) For third party Conductivity 2-e sensors a jumper between F and G may be required.
4.5.2 ph and Redox (ORP) Analog Sensors
pH Redox (ORP)
Terminal Function Color1) Function Color
A Glass Transparent Platinum Transparent
BNotused – – –
CNotused – – –
DNotused – – –
E Reference Red Reference Red
FReference
2) – Reference
2) –
GSolutionGND
2) Blue
3) SolutionGND
2) –
HNotused – – –
I RTDret/GND White – –
J RTDsense – – –
KRTD Green – –
L Notused – – –
MShield(GND) Green/yellow Shield(GND) Green/yellow
N Notused – – –
ONotused – – –
PNotused – – –
QNotused – – –
1) Grey wire not used.
2) Install jumper between F and G for ORP sensors and pH electrodes without SG.
3) Blue wire for electrode with SG.
Transmitter M400 2(X)H 24
© 03/2023 Mettler-Toledo GmbH, CH-8606 Greifensee, Switzerland M400 2-Wire
Printed in Switzerland 30 748 687 A
4.5.3 Amperometric Oxygen Analog Sensors
InPro 6800(G) InPro 6900 InPro 6950
Terminal Function Color Color Color
ANotused – – –
B Anode Red Red Red
C Anode –1) –1) –
DReference –1) –1) Blue
E Notused – – –
FNotused – – –
GGuard – Grey Grey
HCathode Transparent Transparent Transparent
I NTCret(GND) White White White
J Notused – – –
K NTC Green Green Green
L Notused – – –
MShield(GND) Green/yellow Green/yellow Green/yellow
N Notused – – –
ONotused – – –
P+Ain
2) –––
Q–Ain
2) –––
1) Install jumper between C and D for InPro 6800(G) and InPro 6900.
2) 4 to 20 mA signal for pressure compensation
4.6 Terminal Block TB2: ISM Sensors
4.6.1 pH, Amperometric Oxygen, Conductiviy (4-e)
and Dissolved Carbon Dioxide ISM Sensors
Terminal Function Color
ANotused –
BNotused –
CNotused –
DNotused –
E Notused –
FNotused –
GNotused –
HNotused –
I Notused –
J Notused –
K Notused –
L1-wire Transparent(cablecore)
MGND Red(shield)
N RS485-B –
ORS485-A –
P+Ain1) –
Q–Ain1) –
1) Only for Oxygen sensors: 4 to 20 mA signal for pressure compensation
Transmitter M400 2(X)H 25
© 03/2023 Mettler-Toledo GmbH, CH-8606 Greifensee, Switzerland M400 2-Wire
Printed in Switzerland 30 748 687 A
4.6.2 Optical Oxygen ISM Sensors
Optical Oxygen with VP8 Cable1) Optical Oxygen with other Cables
2)
Terminal Function Color Function Color
ANotused – Notused –
BNotused – Notused –
CNotused – Notused –
DNotused – Notused –
E Notused – Notused –
FNotused – Notused –
GNotused – Notused –
HNotused – Notused –
I Notused – D_GND(shield) Yellow
J Notused – Notused –
K Notused – Notused –
L Notused – Notused –
MD_GND(shield) Green/yellow D_GND(shield) Grey
N RS485-B Brown RS485-B Blue
ORS485-A Pink RS485-A White
P+Ain
3) – +Ain
3) –
Q–Ain
3) – –Ain
3) –
1) Connect the grey +24DC wire and the blue GND_24V wire of the sensor separately to an external power supply.
2) Connect the brown +24DC wire and the black GND_24V wire of the sensor separately.
3) 4 to 20 mA signal for pressure compensation
/