Spirax Sarco MTL10 Inline User manual

F1 F2 F3 F4
INSTALLATION AND MAINTENANCE INSTRUCTIONS
IM-8-632-US June 2015
Thermal Mass Flowmeter and
Temperature Transmitter
MTI10 Insertion and MTL10 Inline

Notice
2
This publication must be read in its entirety before performing any operation. Failure
to understand and follow these instructions could result in serious personal injury
and/or damage to the equipment. Should this equipment require repair or adjustment
beyond the procudures given herein, contact the factory at:
Spirax Sarco Inc.
2150 Miller Drive
Longmont, CO 80501
Phone: [phone]
Fax: [phone]
www.spiraxsarco.com/us
Spirax Sarco believes that the information provided herein is accurate;
however, be advised that the information contained herein is NOT a guarantee
for satisfactory results. Specically, this information is neither a warranty nor
guarantee, expressed or implied, regarding performance, merchantability, tness,
or any other matter with respect to the products; nor recommendation for the use
of the product/process information in conict with any patent. Please note that Spirax
Sarco. reserves the right to change and/or improve the product
design and specication without notice.
All Spirax Manuals and software for the MTI10/MTL10 are available in English only.

Table Of Contents
1. Introduction..................................................................................................................Page 4
2. Installation (Mechanical)..............................................................................................Page 8
a. Insertion Type .................................................................................................Page 9
b. Inline Type ....................................................................................................Page 13
3. Wiring (Electrical) ......................................................................................................Page 15
a. Input Power ..................................................................................................Page 17
b. Signal Wiring ................................................................................................Page 19
c. Frequency/Alarm Wiring ...............................................................................Page 21
d. Remote Switch .............................................................................................Page 22
e. Remote Wiring..............................................................................................Page 23
4. Operation (Standard Operation)................................................................................Page 25
a. Start Up ........................................................................................................Page 25
b. Display Screens............................................................................................Page 26
c. Engineering Screens ....................................................................................Page 27
d. Programming................................................................................................Page 28
e. Menu Trees...................................................................................................Page 55
5. Calibration .................................................................................................................Page 62
a. Introduction...................................................................................................Page 62
e. Calibration Validation....................................................................................Page 62
b. Start Up ........................................................................................................Page 66
c. Operation - CAL-V ........................................................................................Page 74
d. Operation - Zero CAL-CHECK .....................................................................Page 76
e. Troubleshooting Calibration Validation .........................................................Page 81
6. Modbus.....................................................................................................................Page 82
a. Introduction...................................................................................................Page 82
b. Modbus Protocol...........................................................................................Page 82
c. RS-485 Wiring ..............................................................................................Page 89
d. Programming Using Local Display ...............................................................Page 90
7. Maintenance..............................................................................................................Page 94
8. Troubleshooting.........................................................................................................Page 97
9. Appendices..............................................................................................................Page 104
 a.Specications .............................................................................................Page 104
b. Agency Approvals.......................................................................................Page 107
c. MTI10/MTL10 with 2 Gas Curves...............................................................Page 108
d. Dimensions ................................................................................................Page 112
e. Installation Variations .................................................................................Page 120
f. Warranty ......................................................................................................Page 122
g. Returning your meter..................................................................................Page 124
3

Thank you for purchasing the Spirax Sarco MTI10 insertion or MTL10
inline Thermal Mass Gas Flowmeter and Temperature Transmitter.
The Model MTI10/MTL10 is one of the most technically advanced
owmetersintheworld.TheMTI10/MTL10utilizethesamesensorand
electronics.TheMTL10includesacompanysuppliedowtube,while
the MTI10 is inserted into an existing pipe. Extensive engineering effort
hasbeeninvestedtodeliveradvancedfeatures,accuracymeasurement
performance and outstanding reliability.
This Instruction Manual contains the electrical and mechanical
installationinstructionsaswellasdetailsforprogramming,maintaining
and troubleshooting the meter.
Thismanualisdividedintothefollowingsections:Introduction,
Installation,Wiring,Operation,CalibrationValidation,Modbus,
Maintenance,Troubleshooting,andAppendices.
Theory of Operation
The MTI10/MTL10 is an innovative Thermal Mass Gas Flowmeter
andTemperatureTransmitter.Itismicroprocessor-basedandeld
programmable. The MTI10/MTL10 thermal sensor operates on the
law that gases absorb heat. A heated sensor placed in an air or gas
stream transfers heat in proportion to the stream’s mass velocity. There
are two sensor elements connected to a balanced bridge circuit. One
sensor element detects the gas temperature and a second element is
maintained at a constant temperature above the gas temperature. The
energy applied to the heated sensor to maintain a constant temperature
differential(constant∆T)isdirectlyproportionaltothemassow
velocity.TheMTI10/MTL10owmetermaintainsaccurateow
measurement over a large temperature and pressure range.
Mass Flow
TheModelMTI10/MTL10measuresmassow;anadvantageover
otherowmeterswhichmeasurevolumetricowrate.Volumetricow
is incomplete because temperature and pressure are unknown and
mustbemeasuredseparately.Forexample,themassowofagas
depends on its temperature and pressure. As temperature and pressure
changes,thegasvolumechangesbutnotitsmass.Thereforeadevice
measuringmassowisindependentoftemperatureandpressure.The
ModelMTI10/MTL10providesadirectmeasurementofgasowinMass
units(kg/hr,lb/hr),standardunits(SCFM,SLPM)ornormalunits(NM3/
hr,NLPM)withnoadditionaltemperatureorpressuremeasurements
required.
4
Introduction
Calibration
Validation
I/O Description
Product
Description
Mass Flow
Welcome
Flow Calibration

Calibration Validation
Spirax Sarco has developed a method to validate the calibration of the
owmeterintheeld.ThismethodiscalledCalibrationValidationand
it is made up of two distinct tests: CAL-V™ and Zero CAL-CHECK™.
The goal of Calibration Validation is to provide operators with the
ability to verify that the meter is capturing accurate data at scheduled
recalibration times - or at any time - instead of sending the meter back to
the factory for recalibration.
ByperformingCAL-V™intheeld,operatorscanverifythatthemeter
is running accurately by testing the functionality of the sensor and its
associated signal processing circuitry. This test can be done in the
pipeandinnormalprocessingconditions.Thesecondtest,ZeroCAL-
CHECK™,ensurestheeffectivenessandsensibilityofthesensorata
"noow"condition.
Flow Calibration
Spirax Sarco maintains instrument calibration records on every
owmeter.ThisdatacanalsobeaccessedviaacomputerusingMTI10/
MTL10 View software within the instrument. Computer-generated
calibrationdocumentsdescribespecicinstrumentdetailsthatcanbe
sortedbyserialnumber,tagnumberorcustomerpurchaseorder.
Calibrationlesincludedetailsonprocessconditions,calibrationuid,
linesizeandotherinformation.AllNIST-traceableequipmentutilizedfor
thecalibrationprocedureisidentied,asisthecalibrationhistoryofall
reference equipment.
InadditiontotheCalibrationCerticate,acertiedowtablethat
correlatescurrentoutputswithscaledunitsofowisproducedforeach
calibrated device.
I/O Description
The MTI10/MTL10 feature two galvanically isolated 4 to 20mA analog
outputs: one isolated digital output that can be used for frequency or
alarm,oneprogrammablediscreteinputandaUSBconnectionfor
communication with a computer.
Therst4to20mAoutputisforowrate.Thesecond4to20mAoutput
canbeconguredeitherforowrateorprocessgastemperature.Both
4 to 20mA outputs can be scaled by the user. The frequency output is
programmabletorepresentowrateandcanbescaledformaximum
5
Introduction
Calibration
Validation
I/O Description
Flow Calibration

F1 F2 F3 F4
IR (infrared) Buttons
Display Window
Push Buttons
ow/maximumfrequency,units-per-pulseorpulse-per-units.The
maximumfrequencyis100Hz.Anisolated24VDCoutputpoweroption
is provided for use with these outputs. It can supply a 42mA maximum
total load (do not use for other external devices).
MTI10/MTL10 View interfaces to the USB port and is a free PC-
basedsoftwareprogramthatdisplaysowmeterreadingsandpermits
owmeterconguration.
RS485Modbus,andindustrystandardcommunicationoption,is
availableontheMTI10/MTL10owmeter.
Optional Display Panel & Conguration Panel
Thecongurationpanelallowstheusertochangeavarietyofsettings.
The display is 2 lines x 16 characters with 4 mechanical and 4 IR
(infrared) buttons. The IR and mechanical buttons perform the same
function but the IR buttons can be used without opening the cover. The
IRbuttonscanbecalibrated(p.54)forbetteroperationintheeld
or disabled (p. 54) when the meter is used in snow or ice in order to
avoid false key detection.
Fig.1.1:OptionalDisplayandCongurationPanel
6
Introduction
Display

F1 F2 F3 F4
Standard I/O
4 to 20 mA Flow
Contact Input
4 to 20 mA Flow or Temperature
Frequency or Alarm
USB
(Free meter View Software)
Outputs and Communications are Galvanically Isolated
Optional Digital Communications
RS485 Modbus
24VDC Input Power
100-240VAC Optional
Optional Display and
Conguration Panel
Standard Digital Communications
Functional Diagram
Anoptionalon-boarddisplayisavailabletoviewowrate,totalow,
elapsedtime,processgastemperatureandalarms.Thedisplayisalso
usedinconjunctionwiththeCongurationPanelforeldconguration
ofowmetersettingssuchas4to20mAscaling,pulseoutputfrequency
scaling,pipearea,zeroowcutoff,owlteringordamping,display
congurations,diagnosticsandalarmlimits.
Fig. 1.2: Functional Diagram
Functional
Diagram
7
Introduction

Scope
This section describes how to install the Spirax Sarco MTI10/MTL10
Flowmeter and how to get started. Installation methods will vary
accordingtotheowmetertype(insertionorinline).
For Insertion Types (MTI10):
1. Determine lateral position on the pipe
2. Sensor installation depth
3. Sensororientationinrelationtosensorlengthanddirectionofow
4. Propertighteningofcompressionttingformountingmeter
For Inline Types (MTL10):
1. Determine lateral position on the pipe
2. Flowbodyorientationinrelationtodirectionofowinpipe
3. Propertighteningofcompressiontting
Installation procedures must be performed using a combination of the
enduser’sbestengineeringpractices,incompliancewithlocalcodes,
and manufacturer’s recommendations.
General Precautions
The following general precautions should be observed:
1. Exercisecarewhenhandlingtheowmetertoavoiddamagingthe
probe,sensororenclosure.
2. The enclosure covers must be closed except during installation.
3. Mounting MTI10 or MTL10 in direct sunlight can cause the
temperatureinsidetheenclosuretoincreasebeyonddesignlimits,
resulting in failure of LCD display and reduced component life. It is
recommended that a sunshade be installed to avoid direct sunlight.
4. Ensuretheowdirectionarrowpointsinthedirectionofow.
5. DonotinstalltheMTI10orMTL10enclosurenearanigniter,igniter-
controller or switching equipment.
6. Do not install an external power supply in a cabinet containing an
igniter controller or switching equipment.
7. Ensure that good engineering practices and applicable industry
codes are followed throughout the installation process.
8. Foraccurateowmeasurement:reviewowmeterplacement
instructionsbeforeinstallationtoensureaproperowproleinthe
pipe.
Installation -
MTI10/MTL10
Flowmeter
8
Installation: General
Insertion
Flowmeter Lateral
Placement

FLOW
10X Pipe ID
Proper
Profile
15X Pipe ID
Irregular
Profile
F1 F2 F3 F4
F1 F2 F3 F4
Instructions for Insertion Flowmeter Lateral Placement
InstalltheModelMTI10Insertionstyleowmetersothatitisfarenough
awayfrombendsinthepipe,obstructions,orchangesinlinesizes
toensureaconsistentowprole.Fifteendiametersofstraightpipe
upstream and ten downstream are recommended.
Forexample,a2"pipewouldrequire30"upstreamand20"downstream,
but a 4" pipe would require 60" upstream and 40" downstream.
Fig. 2.1: Upstream and Downstream Pipe IDs for Insertion Meters
Special Conditions of Use:
• Consult the manufacturer if dimensional information on the
ameproofjointsisnecessary.
• Follow the manufacturer's instructions to reduce the potential of
anelectrostaticcharginghazard.
9
Installation: Insertion Type
Insertion
Flowmeter Lateral
Placement

Half Coupling,
3/4" NPT Female
( Supplied by
Customer
)
Compression Fitting
(Supplied by Spirax Sarco)
Customer’s Pipe
22mm (0.87”)
L
C
F1 F2 F3 F4
Installation Depth
The installation depth of the sensor in the pipe is dependent on the pipe
size.Togetthemostaccuratereading,properplacementofthesensor
windowwithinthepipeisnecessary.AsshowninFig2.2,theendof
the sensor window should be 22mm (0.87") past the center line of the
pipe.
Fig. 2.2: Cross Section of Insertion Sensor Depth in Pipe
10
Installation: Insertion Type
Installation Depth Sensor Orientation
- Direction of Flow

F1 F2 F3 F4
FLOW
Pipe
Flow Direction Arrow
+10°
-10°
FLOW
FLOW
Fig. 2.3: Orientation of MTI10 Insertion Type Flowmeter
Note:Someowmetersareshippedwiththesensorelementsthatare
offset(seegure2.4).Othersareshippedwithsensorsthathaveequal
lengthelements(seegure2.5).Thesensortypesuppliedwasselected
at the factory to be the best suited for your application. Follow the
appropriate sensor orientation instructions.
Unequal Length Sensor Elements
Install the shorter sensor element upstream from the longer one.
Fig. 2.4: Unequal Length Sensor Elements
11
Installation: Insertion Type
Sensor Orientation
- Direction of Flow
Sensor Orientation
- Unequal Length
Sensors

+10°
-10°
FLOW
FLOW
Equal Length Sensor Elements
Installowmeterwithboth sensor elementsfacingtheowstream
within ±3mm (0.1”).
Fig. 2.5: Equal Length Sensor Elements
Insertion Mounting Instructions - Compression Fittings
The MTI10 is mounted through a ¾" hole and a ¾" female NPT half
couplingprovidedinthecustomer'spipe.Insertionstyleowmetersare
not designed for use in pipes smaller than 1½".
• Installthecompressionttingintothe¾-inchfemaleNPThalf
coupling.
• Wheninstallingina50mm(2")pipeorlarger,installtheendofthe
probe 22mm (0.87") past the center line of the pipe and tighten the
compressionttingnut(refertoFigure2.2onpage10).
• When installing into a 40mm (1.5") pipe carefully install the probe
into the pipe until it touches the opposite wall and pull back 3mm
(0.1”).Tightenthecompressionttingnut.
Caution:Oncethecompressionttingislockedontotheprobe,the
probecanberemovedorrotated,buttheinsertiondepthislockedin
place.
Note: Donotovertightencompressiontting.
Fig. 2.6: Proper Tightening of the Compression Fitting Nut
Whileholdingthettingbodysteady,tightenthenutoneandone-quarterturntothe9
o'clock position.
Installation: Inline Type
Flowmeter
Placement -
Inline Type
1212
Installation: Insertion Type
Mounting -
Insertion Type
Sensor Orientation
- Equal Length
Sensors

FLOW
4X Pipe ID
Proper
Profile
8X Pipe ID
Irregular
Profile
F1 F2 F3 F4
F1 F2 F3 F4
Instructions for Inline Flowmeter Placement
InstalltheMTL10Inlinestyleowmetersothatitisfarenoughaway
frombendsinthepipe,obstructions,orchangesinlinesizestoensure
aconsistentowprole.Eightdiametersofstraightpipeupstreamand
four downstream are recommended (for ¼" meters: 6” (152 mm) of
straight,unobstructedpipeupstreamanddownstreamarerequired).
Forexample,a2"pipewouldrequire16"upstreamfromtheedgeof
theowbodyand8"downstreamfromtheotherendoftheowbody,
whereas a 4" pipe would require 32" upstream and 16" downstream.
TheMTL10iswelded,threadedorangedtothecustomer’spipe.Care
should be taken to ensure that the diameter of the mating pipe is the
samediameterastheMTL10owbodyorerrorsinowreadingscan
occur. The installation procedure should be a combination of the end
user’sbestengineeringpractices,incompliancewithlocalcodes,and
the manufacturer’s recommendations.
See Figure 2.7 for a detailed look at upstream and downstream pipe
diameters for inline meters.
Fig. 2.7: Upstream and Downstream Pipe IDs for Inline Meters
13
Installation: Inline Type
Flowmeter
Placement -
Inline Type

FLOW
Flow Body
F1 F2 F3 F4
Inline Orientation
Installtheowbodysothattheengravedarrowonthettingandthe
arrowontheowbodyarepointingwiththedirectionofow.
Fig. 2.8: Orientation of an Inline Meter - Directional Arrows
Tightening Compression Fittings
Thecompressionttinghasbeenplacedaccordingtotheproperdepth
intheowbodybySpiraxSarcofactorytechnicians.Aftertheowbody
hasbeencorrectlyttedtotheprocesspipe,thecompressionttingmay
Note:
• Refer to the Spirax Sarco Calibration Validation Chapter
forinformationonsettingtheeldbaselineforZeroCAL-
CHECK™ tests if you plan to perform these tests in the
pipe.
• Please save the PVC sensor cover that was shipped
with your meter. It will be needed to perform Zero CAL-
CHECK™ tests out of pipe.
Wiring: General
Scope
Precautions
Power Wiring
14
Installation: Inline Type
Mounting - Inline
Type
Flow Body
Orientation -
Inline Type

needtobetightenedcorrectly(seegure2.6onp.12).
Wiring Instructions
WiretheMTI10/MTL10byopeningtherearenclosurecover,bringing
customer-supplied wires in through the conduit openings and connecting to
the terminal blocks. The MTI10/MTL10 has two conduit openings to maintain
separation between AC input power and output signal wiring. To eliminate
thepossibilityofnoiseinterference,useaseparateconduitforACpowerand
cut all wires short for a minimum service loop.
Wiring Precautions
• WARNING - DO NOT OPEN WHEN ENERGIZED OR AN EXPLOSIVE
ATMOSPHERE IS PRESENT.
• Allplumbingandelectricalinstallationsofowmetersmustbein
compliancewithlocalcodes,theenduser’sbestengineeringpractices,
and manufacturer’s recommendations.
• An external power disconnect and 16A over-current protection are
required for the AC and DC powered MTI10/MTL10
• DonotinstalltheMTI10/MTL10enclosurenearanigniter,igniter-
controller or switching equipment.
• Do not install an external power supply in a cabinet containing an
igniter controller or switching equipment.
• Thisowmetercontainscomponentsthatcanbedamagedbystatic
electricity. You must discharge yourself by touching a grounded steel pipe
orothergroundedsteelmaterialpriortoworkinginsidethisowmeter.
• Fortheremotesensoroption,theserialnumberoftheelectronics
enclosure must match the remote sensor probe.
• Closeanyunusedentriesusingsuitablycertiedplugs
Power Wiring
Forpowerwiring,usestrandedcopperwire,nolargerthan16-gauge.If
anexternal24VDCpowersourceisused,twistedpairshieldedcableis
recommended. Supply connection wiring must be rated for at least 90°C
(194°F).
Grounding
The enclosure must be properly grounded with a quality earth ground. 16
gauge,strandedwireisrecommended.
Signal Wiring
Forsignalwiring,therecommendedwiregaugeis18to22AWG.Alwaysuse
twisted pair shielded cable. The cable shield should not be connected at the
owmeter,itshouldbeconnectedatthepowersupplyACgroundterminalor
instrumentation AC ground. Do not route the power and signal wires in the
same conduit. Power wires must enter left-hand conduit entry. Signal and
remote sensor (where applicable) must enter right-hand conduit entry.
15
Wiring: General
Scope
Precautions
Power Wiring
Grounding
Signal Wiring

2x 3/4 inch NPT Female F1 F2 F3 F4
Signal Wiring,
Serial Communication,
Remote Sensor Wiring
Input
Power
Serial Communication Wiring
IfyouhavepurchasedtheRS485communicationoption,please
refer to the Modbus section of this manual on p. 89.
Remote Sensor Wiring
Note: Remote wiring is only required when the Remote Electronics
optionsisprovided.Fivewireshieldedcablerequired,the
recommended wire gauge is 18AWG. Make sure that the cable
length does not exceed 100 feet and the wire resistance does
not exceed one ohm. Do not connect the cable shield at the
electronics enclosure end.
Fig. 3.1: MTI10/MTL10 Wiring
Note:
Serial numbers: Ifyouhavemorethanonemeter,youmust
ensurethattheserialnumbersoftheprobe/J-Box,remote
electronics,housing,and/orowbodymatchoneanother.These
items have been manufactured and calibrated to operate as a unit
and cannot be mismatched.
Installation wiring: Obtain the correct length for the MTI10/MTL10
power and signal wires using one of these methods:
• Trim the wires to extend 2.5 inches out of the enclosure
after the conduit and wires are routed to the MTI10/MTL10
(preferred method).
• Trim the wires to extend 6 inches from the end of the conduit
before it is attached to the MTI10/MTL10.
16
Wiring: General
Serial
Communication
Wiring
Remote Sensor
Wiring
MTI10/MTL10
Wiring
Power Input Wiring

Power Input Requirements: 24VDC Supply
ExternalDCpowersupplymustprovide24VDC±10%,at0.7Amps
minimum.
The enclosure must be properly grounded with a quality earth ground.
Sixteen(16)gauge,strandedwire,isrecommendedforpowerandearth
ground.
Fig. 3.2: Connections for 24VDC Supply
4-20
FLOW
TS4
24V
OUT
4-20
#2
Red 1
Red2
Yel 3
Wh 4
Wh 5
PULSE
/ALM
TS2
TS1
F1
J2
1
24V, 0.75A
2 3
IN
+1
-2 +1
-2
+3
-4
+5
-6
+7
-8
TS3
REMOTE
SENSOR
Earth Ground
24V Return
+24VDC
Caution:
• Supply connection wiring must be rated for at least
90°C (194° F).
17
Wiring: Input Power
Power Input Wiring

4-20
FLOW
TS4
24V
OUT
4-20
#2
Red 1
Red2
Yel 3
Wh 4
Wh 5
PULSE
TS2
TS1
F1
J2
1
24V, 0.75A
2 3
IN
+1
-2 +1
-2
+3
-4
+5
-6
+7
-8
TS3
REMOTE
SENSOR
Earth Ground
AC (L)
AC (N)
Power Input Requirements: 100 to 240VAC Supply
IftheMTI10/MTL10hastheACpoweroption,theACpowermustprovide
100 to 240VAC -15% / +10% (85 to 264VAC) at 0.2 Amps minimum.
The enclosure must be properly grounded with a quality earth ground.
Sixteen(16)gauge,strandedwire,isrecommended.
Fig. 3.3: Connections for optional AC Power
Caution:
• Supply connection wiring must be rated for at least
90°C (194° F).
18
Wiring: Input Power
Power Input Wiring 4 to 20mA Loop
Power Provided
by Customer
(Recommended)

4-20
FLOW
TS4
24V
OUT
4-20
#2
Red 1
Red2
Yel 3
Wh 4
Wh 5
PULSE
/ALM
TS2
TS1
F1
J2
1
24V, 0.75A
2 3
IN
+1
+1 -2
-2
+3
-4
+5
-6
+7
-8
TS3
REMOTE
SENSOR
+24VDC
+24VDC
4 to 20mA FLOW RATE
4 to 20mA TEMPERATURE OR
FLOW RATE
24VDC Return
Customer PLC or DCS
MTI10
MTL10
24VDC Return
* (see important note below)
* (see important note below)
4 to 20mA Output Wiring: Customer-Supplied Power Source
Bring the 4 to 20mA wiring in through the right-hand conduit hub.
ConnectFLOWRATE4to20mAwiringtoTS2,1(+)&2(-).Connect4to
20mAoutput#2wiringtoTS2,3(+)&4(-).
Fig. 3.4: 4 to 20mA Output Wiring for Customer-Supplied Power
Source
Important Note
The load resistor on the MTI10/MTL10 Flowmeter 4 to 20mA signal
is typically 250 ohms and is located in or at the customers PLC or
DCS. A 250 ohm resistor in the 4 to 20mA line will result in a 1 to
5VDC signal to the PLC or DCS. Some PLC/DCS equipment has
theloadresistorbuiltintotheunit;pleaserefertothePLC/DCS
technical manual. Do not exceed a 600 ohm load on the MTI10/
MTL10 Flowmeter 4 to 20mA signal.
19
Wiring: Signal Wiring
4 to 20mA Loop
Power Provided
by Customer
(Recommended)

4-20
FLOW
TS4
24V
OUT
4-20
#2
Red 1
Red2
Yel 3
Wh 4
Wh 5
PULSE
/ALM
TS2
TS1
F1
J1
1
24V, 0.75A
2 3
IN
+1
+1 -2
-2
+3
-4
+5
-6
+7
-8
TS3
REMOTE
SENSOR 4 to 20mA FLOW RATE
4 to 20mA TEMPERATURE
OR FLOW RATE
Customer PLC or DCS
MTI10
MTL10
+
(+)1( )2
+
-
-
TS4
24V
OUT
-
* (see important note below)
* (see important note below)
4 to 20mA Output Wiring: Loop Power Provided by MTI10/MTL10
Bring the 4 to 20mA wiring in through the right-hand conduit hub.
Connect the 4 to 20mA wiring to terminal blocks TS2 and TS4 as shown
in the diagram below.
Fig. 3.5: 4 to 20mA Output Wiring for Loop Power Provided by
MTI10/MTL10
Note: This wiring option is only available with the isolated 24V ouput
power option.
Important Note
The load resistor on the MTI10/MTL10 Flowmeter 4 to 20mA signal
is typically 250 ohms and is located in or at the customers PLC or
DCS. A 250 ohm resistor in the 4 to 20mA line will result in a 1 to
5VDC signal to the PLC or DCS. Some PLC/DCS equipment has
theloadresistorbuiltintotheunit;pleaserefertothePLC/DCS
technical manual. Do not exceed a 600 ohm load on the MTI10/
MTL10 Flowmeter 4 to 20mA signal.
Caution:
Do not exceed
42mA total load (ie
including 4-20mA
outputs).
20
Wiring: Signal Wiring
4 to 20mA
Loop Power
Provided by
MTI10/MTL10
Frequency/Alarm
Output Wiring