Spirax Sarco MTI10 Insertion User manual

IM-S65-01-US Issue 1 1
Thermal Mass Flowmeter and Temperature Transmitter MTI10 Insertion and MTL10 Inline
© Copyright 2023
Printed in US
Thermal Mass Flowmeter and
Temperature Transmitter
MTI10 Insertion and MTL10 Inline
Installation and Maintenance Instructions
IM-S65-01-US
Issue 1
F1 F2 F3 F4

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Thermal Mass Flowmeter and Temperature Transmitter MTI10 Insertion and MTL10 Inline
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 US
1150 Northpoint Boulevard
Blythewood, SC 29016
Phone: [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.
Specifically, this information is neither a warranty nor guarantee, expressed or implied,
regarding performance, merchantability, fitness, or any other matter with respect to
the products; nor recommendation for the use of the product/process information in
conflict with any patent.
Please note that Spirax Sarco. reserves the right to change and/or improve the product
design and specification without notice.
All Spirax Sarco Manuals and software for the MTI10/MTL10 are available in English
only.
Symbol meanings
Caution! - (refer to accompanying documents): Please follow the specified instructions
and general safety practices.
IP67
Indicates compliance with the WEEE Directive. Please dispose of the product in
accordance with local regulations and conventions.
IP67
Indicates compliance with the applicable European Union Directives for ATEX (2014/34/
EU), Safety LVD (Low Voltage Directive 2014/35/EU), EMC (Electromagnetic Compatibility
Directive 2014/30/EU), and PED (Pressure Equipment Directive 2014/68/EU).
IP67 Enclosure Protection Classification per IEC 60529: Protected against the ingress of
dust and Immersion.

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Thermal Mass Flowmeter and Temperature Transmitter MTI10 Insertion and MTL10 Inline
Contents
1. Introduction 6
2. Installation 9
2.1 General
2.2 Insertion type 10
2.3 Inline type 11
3. Wiring (Electrical) 17
3.1 General
3.2 Input power 19
3.3 Signal Wiring 21
3.4 NE-43 alarms 23
3.5 Frequency/Alarm Output Wiring 24
3.6 Remote switch 26
3.7 Remote sensor option 27
3.8 Remote switch 28

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4. Operation 30
4.1 Start Up
4.2 Display Screens 31
4.3 Engineering displays 32
4.4 Programming 33
4.5 Menu Tree 62
5. Calibration
74
5.1 Calibration of the Spirax Sarco MTI10/MTL10 flowmeter
5.2 Calibration Validation
5.3 CAL-V™ Calibration Validation Test 76
5.4 Zero CAL-CHECK® Calibration Validation Test 77
5.5 Starting Up CAL-V™
78
5.6 Starting Up Zero CAL-CHECK®
5.7 Techniques for Achieving Zero Flow - In the Pipe
5.8 Achieving Zero Flow - Out of Pipe
5.9 Setting Field Baseline for In-Situ Zero CAL-CHECK® tests
79
5.10 Using the Packing Gland Assembly
5.11 Starting the Field Baseline Set 83
5.12 Performing the CAL-V™ Calibration Validation Test 85
5.13 Performing the Zero CAL-CHECK® Calibration Validation Test 87
5.14 Performing the Zero CAL-CHECK® - In the Pipe 88
5.15 Performing the Zero CAL-CHECK® - Out of Pipe 89
5.16 Troubleshooting CAL-V™
91
5.17 Troubleshooting Zero CAL-CHECK®

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6. Modbus RTU (RS485)
92
6.1 Scope
6.2 Read Holding Registers (command 03)
6.3 Read Input Register (MTI10/MTL10 status and status 2 command 04) 96
6.4 Preset Single Register (command 06) 97
6.5 RS-485 Termination Resistor 99
6.6 Entering the programming mode
7. Maintenance 103
7.1 Precautions
7.2 Broken or Damaged Probe
105
7.3 Flow Calibration and Calibration Validation
7.4 Fuse Replacement
7.5 Sensor Wiring
7.6 Sensor Cleaning
8. Troubleshooting 106
8.1 General
8.2 Installation Problems 108
8.3 Alarm Codes 110
9. Appendices 112
9.1 Specifications
9.2 Agency Approvals 115
9.3 MTI10/MTL10 with 2 Gas Curves 116
9.4 Dimensions 120
9.5 Installation Variations (moisture) 128
9.6 Installation Variations (limited space) 129
9.7 Warranty
130
9.8 Out of Warranty Conditions
9.9 Returning your meter 131

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Thermal Mass Flowmeter and Temperature Transmitter MTI10 Insertion and MTL10 Inline
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 e󰀨ort 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.
1.1 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 di󰀨erential (constant ∆ T) is directly proportional to the mass ow velocity. The
M TI10/ M T L10  o w m et e r ma i n t a i ns a c c u r ate  ow m e a su r e m e nt ove r a l a rge t empe r a t u r e a n d p r e s s u r e
range.
1.2 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
measur ing 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.
1.3 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 p er form ing CA L-V™ in th e  el d, o pe rator s c an veri f y t hat the m ete r i s r un nin g acc ur ate ly by test in g
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
e󰀨ectiveness and sensibility of the sensor at a "no ow" condition.
1. Introduction

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Thermal Mass Flowmeter and Temperature Transmitter MTI10 Insertion and MTL10 Inline
Fig. 1 -
Optional Display and Configuration Panel
1.4 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.
Cal i b rat i o n  l e s in c l u d e d etai l s o n p roc es s c o n dit i o n s, c a l ibr a t i on  u i d, li n e si z e a n d o t h er i nf o r m a t ion.
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.
1.5 I/O Description
The MTI10/MTL10 feature two galvanically isolated 4-20 mA analog outputs: one isolated digital output
that can be used for frequency or alarm, one programmable switch input and a USB connection for
communication with a computer.
The rst 4-20 mA output is for ow rate. The second 4-20 mA output can be congured either for ow
rate or process gas temperature. Both 4-20 mA outputs can be scaled by the user. The frequency
o u t p u t i s p r o g r a m m a b l e t o r e p r e s e n t  o w r a t e a n d c a n b e s c a l e d f o r m a x i m u m  o w / m a x i m u m f r e q u e n c y ,
units-per-pulse or pulse-per-units. The maximum frequency is 100 Hz. An isolated 24 Vdc output
power option is provided for use with these outputs. It can supply a 42 mA 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.
Modbus RTU (RS485), an industry standard communication option, is available on the MTI10/MTL10
ow meter.
1.6 Optional display panel and configuration 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. 60) for better operation
in th e  el d o r dis able d (p. 6 0) w hen t he met er
is used in snow or ice in order to avoid false
key detection.
F1 F2 F3 F4
Display Window
IR (infrared) Buttons
Push Buttons

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1.7 Functional Diagram
An optional on-board display is available to view flow rate, total flow, elapsed time, process gas
temperature and alarms. The display is also used in conjunction with the Configuration Panel for field
configuration of flowmeter settings such as 4-20 mA scaling, pulse output frequency scaling, pipe
area, zero flow cutoff, flow filtering or damping, display configurations, diagnostics and alarm limits.
Fig. 2 - Functional Diagram
F1 F2 F3 F4
24 Vdc Input Power
100-240 Vac Optional
Optional Display and
Configuration Panel
Standard I/O
4 to 20 mA Flow
4 to 20 mA Flow or Temperature
Frequency or Alarm
Contact Input
Standard Digital
Communications
USB
(Free meter View Software)
Optional Digital
Communications
RS485 Modbus

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Thermal Mass Flowmeter and Temperature Transmitter MTI10 Insertion and MTL10 Inline
2. Installation
2.1 General
2.1.1 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 flowmeter 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 flow
4. Proper tightening of compression fitting for mounting meter
For Inline Types (MTL10):
1. Determine lateral position on the pipe
2. Flow body orientation in relation to direction of flow in pipe
3. Proper tightening of compression fitting
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.
2.1.2 General Precautions
The following general precautions should be observed:
1. Exercise care when handling the flowmeter to avoid damaging the probe, sensor or enclosure.
2. Close any unused conduit openings in the enclosure with plugs certified for your application.
3. The enclosure covers must be closed except during installation.
4. 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.
5. Ensure the flow direction arrow points in the direction of flow.
6. Do not install the MTI10 or MTL10 enclosure near an igniter, igniter-controller or switching
equipment.
7. Do not install an external power supply in a cabinet containing an igniter-controller or switching
equipment.
8. Ensure that good engineering practices and applicable industry codes are followed throughout
the installation process.
9. For accurate flow measurement: review flowmeter placement instructions before installation to
ensure a proper flow profile in the pipe.

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Thermal Mass Flowmeter and Temperature Transmitter MTI10 Insertion and MTL10 Inline
2.2 Insertion type
2.2.1 Instructions for Insertion Flowmeter Lateral Placement
Install the Model MTI10 Insertion style flowmeter so that it is far enough away from bends in the pipe,
obstructions, or changes in line sizes to ensure a consistent flow profile. Fif teen 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. 3 - Upstream and Downstream Pipe IDs for Insertion Meters
Specific Conditions of Use:
-The flameproof joints of the equipment are not intended to be repaired.
Consult manufacturer if dimensional information on the flameproof joints is necessary.
-Follow the manufacturer's instructions to reduce the potential of an electrostatic charging hazard.
Proper Profile
Flow
15 x Pipe ID 10 x Pipe ID
Irregular Profile

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Thermal Mass Flowmeter and Temperature Transmitter MTI10 Insertion and MTL10 Inline
L
C
F1 F2 F3 F4
2.2.2 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 22 mm (0.87") past the center line of
the pipe.
Fig. 4 - Cross Section of Insertion Sensor Depth in Pipe
Half Coupling,
¾" NPT Female(Supplied byCustomer)
Compression Fitting
(Supplied by Spirax Sarco)
Customer’s Pipe
22 mm (0.87")

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Thermal Mass Flowmeter and Temperature Transmitter MTI10 Insertion and MTL10 Inline
F1 F2 F3 F4
+2°
-2°
Pipe
Flow Direction Arrow
Flow
Fig. 5 - Orientation of MTI10 Insertion Type Flowmeter
Note!
Some flowmeters are shipped with the sensor elements that are offset (see figure 6). Others are
shipped with sensors that have equal length elements (see figure 7). The sensor type supplied
was selected at the factory to be the best suited for your application. Follow the appropriate sensor
orientation instructions.

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Thermal Mass Flowmeter and Temperature Transmitter MTI10 Insertion and MTL10 Inline
Fig. 6 - Unequal Length Sensor Elements
2.2.4 Equal Length Sensor Elements
Install flowmeter with both sensor elements facing the flow stream within ±3 mm (0.1").
F1 F2 F3 F4
+2°
-2°
2.2.3 Unequal Length Sensor Elements
Install the shorter sensor element upstream from the longer one.
+2°
-2°
Fig. 7 - Equal Length Sensor Elements
Flow
Flow
Flow
Flow

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Thermal Mass Flowmeter and Temperature Transmitter MTI10 Insertion and MTL10 Inline
+2°
-2°
2.2.5 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 flowmeters are not designed for use in pipes smaller than 1½".
-Install the compression fitting into the ¾-inch female NPT half coupling.
-When installing in a 50 mm (2") pipe or larger, install the end of the probe 22 mm (0.87") past
the center line of the pipe and tighten the compression fitting nut (refer to Figure 4 on page 11).
-When installing into a 40 mm (1.5") pipe carefully install the probe into the pipe until it touches
the opposite wall and pull back 3 mm (0.1"). Tighten the compression fitting nut.
Caution
Once the compression fitting 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 fitting.
Fig. 8 - Proper Tightening of the Compression Fitting Nut
While holding the fitting body steady, tighten the nut one and one-quarter turn to the 9 o'clock position.

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Thermal Mass Flowmeter and Temperature Transmitter MTI10 Insertion and MTL10 Inline
2.3 Inline type
2.3.1 Instructions for Inline Flowmeter Placement
Install the MTL10 Inline style flowmeter so that it is far enough away from bends in the pipe,
obstructions, or changes in line sizes to ensure a consistent flow profile. 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 flow body and 8" downstream
from the other end of the flow body, whereas a 4" pipe would require 32" upstream and 16" downstream.
The MTL10 is welded, threaded or flanged 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 flow body or errors in flow 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 9 for a detailed look at upstream and downstream pipe diameters for inline meters.
Fig. 9 - Upstream and Downstream Pipe IDs for Inline Meters
F1 F2 F3 F4
F1 F2 F3 F4
Proper Profile
Flow
8 x Pipe ID 4 x Pipe ID
Irregular Profile

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Thermal Mass Flowmeter and Temperature Transmitter MTI10 Insertion and MTL10 Inline
2.3.2 Inline Orientation
Install the flow body so that the engraved arrow on the fitting and the arrow on the flow body are
pointing with the direction of flow.
Fig. 10 - Orientation of an Inline Meter - Directional Arrows
2.3.3 Tightening Compression Fittings
The compression fitting has been placed according to the proper depth in the flow body by Spirax Sarco
factory technicians. After the flow body has been correctly fitted to the process pipe, the compression
fitting may need to be tightened correctly (Figure 8 on p. 14).
Note!
-Refer to the Spirax Sarco Calibration Validation Chapter for information on setting the field 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.
F1 F2 F3 F4
Pipe
Flow

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Thermal Mass Flowmeter and Temperature Transmitter MTI10 Insertion and MTL10 Inline
3.1 General
3.1.1 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.
3.1.2 Wiring Precautions
-WARNING - DO NOT OPEN WHEN ENERGIZED OR AN EXPLOSIVE ATMOSPHERE IS
PRESENT.
-All plumbing and electrical installations of flowmeters 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 flowmeter 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 flowmeter.
-For the remote sensor option, the serial number of the electronics enclosure must match the
remote sensor probe.
-Close any unused entries using suitably certified plugs
3.1.3 Power Wiring
For power wiring, use stranded copper wire, no larger than 16-gauge. If an external 24 Vdc power
source is used, twisted pair shielded cable is recommended. Supply connection wiring must be rated
for at least 90°C (194°F).
3.1.4 Grounding
The enclosure must be properly grounded with a quality earth ground. 16 gauge, stranded wire is
recommended.
3.1.5 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 flowmeter, 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.
3. Wiring (electrical)

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Thermal Mass Flowmeter and Temperature Transmitter MTI10 Insertion and MTL10 Inline
3.1.6 Serial Communication Wiring
If you have purchased the RS485 communication option, please refer to the Modbus section of this
manual.
3.1.7 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. 11 - 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 flow 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.
F1 F2 F3 F4
2 x ¾" NPT Female
Input Power Signal Wiring,
Serial Communication,
Remote Sensor Wiring

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Thermal Mass Flowmeter and Temperature Transmitter MTI10 Insertion and MTL10 Inline
3.2 Input power
3.2.1 Power Input Requirements: 24 Vdc Supply
External DC power supply must provide 24 Vdc ± 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. 12 - Connections for 24 Vdc Supply
Caution
Supply connection wiring must be rated for at least 90°C (194° F).
Note!
A power failure or resetting the total will cause the Contract Time to change. Data Logger with a Real
Time Clock (RTC) option should be used to avoid this.
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
23
IN
+1
-2 +1
-2
+3
-4
+5
-6
+7
-8
TS3
REMOTE
SENSOR
Earth Ground
24V Return
+24 Vdc

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Thermal Mass Flowmeter and Temperature Transmitter MTI10 Insertion and MTL10 Inline
3.2.2 Power Input Requirements: 100 to 240 Vac Supply
If the MTI10/MTL10 has the AC power option, the AC power must provide 100 to 240 Vac -15% / +10%
(85 to 264 Vac) at 0.2 Amps minimum.
The enclosure must be properly grounded with a quality earth ground. Sixteen (16) gauge, stranded
wire, is recommended.
Fig. 13 - Connections for optional AC Power
Caution
Supply connection wiring must be rated for at least 90°C (194° F).
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
23
IN
+1
-2 +1
-2
+3
-4
+5
-6
+7
-8
TS3
REMOTE
SENSOR
Earth Ground
AC (L)
AC (N)