MTS Sensors Level Plus M Series Specification sheet

Magnetostrictive Liquid-Level Transmitters
with Temposonics®Technology
Level Plus®
OPERATION AND INSTALLATION MANUAL
M-Series Model MC420 Analog Transmitter
The Measurable Difference

MTS Sensors
Level Plus®Liquid-Level Sensors - M-Series Model MC420 Analog Transmitter,
Operation and Installation Manual, Part No.: 550760 Revision E (EN) 02/2016i
GERMANY
GENERAL:
Tel:[phone]
Fax:[phone]
Email: [email protected]
http://www.mtssensors.com
MAILING AND SHIPPING ADDRESS:
MTS Sensor Technologie, GmbH & Co. KG
Auf dem Schüffel 9
D - 58513 Lüdenscheid, Germany
TECHNICAL SUPPORT AND APPLICATIONS:
Tel:[phone]
Email: [email protected]
http://www.mtssensors.com
JAPAN
GENERAL:
Tel: [phone]
Fax: [phone]
Email: [email protected]
http://www.mtssensors.com
MAILING AND SHIPPING ADDRESS:
MTS Sensors Technology Corporation
737 Aihara-cho, Machida-shi
Tokyo 194-0211, Japan
TECHNICAL SUPPORT AND APPLICATIONS:
Tel: [phone]
Fax: [phone]
GENERAL:
Tel: [phone]
Fax: [phone]
Email: [email protected]
http://www.mtssensors.com
MAILING AND SHIPPING ADDRESS:
MTS Systems Corporation
Sensors Division
3001 Sheldon Drive
Cary, North Carolina, 27513, USA
CUSTOMER SERVICE:
Tel: [phone]
Fax: [phone]
Email: [email protected]
TECHNICAL SUPPORT AND APPLICATIONS:
24 Hour Emergency Technical Support
Tel: [phone]
Email: [email protected]
UNITED STATES
OFFICE HOURS (EST):
Monday - Thursday: 8:00 a.m. to 5:00 p.m.
Friday: 8:00 a.m. to 4:00 p.m.
REMITTANCE ADDRESS:
MTS Systems Corporation
Sensors Division
NW 5872
P.O. Box 1450
Minneapolis, MN, 55486-5872
QUOTE AND CONTRACT TERMS & CONDITIONS:
The parties expressly agree that the purchase and use of Material and/
or Services from MTS Sensors Division are subject to MTS’ Terms
and Conditions, in effect as of the date of this document, which are
located at http://www.mtssensors.com and are incorporated by refer-
ence into this and any ensuing contract. Printed Terms and Conditions
can be provided upon request by emailing [email protected]
or if you prefer, go to http://www.mtssensors.com and click the
Quote/Contract Terms and Conditions link at the bottom of the page
to download the PDF.
Contact
Information
Model MC420 Operation and Installation Manual
Contact Information

MTS Sensors
Level Plus®Liquid-Level Sensors - M-Series Model MC420 Analog Transmitter,
Operation and Installation Manual, Part No.: 550760 Revision E (EN) 02/2016 ii
Reference
Information
Model MC420 Operation and Installation Manual
Reference Information
Notices used in this manual
This manual contains notices to highlight specific information as follows:
Notes:
These notices provide important tips, guidance, or advice.
Important:
These notices provide information that might help you avoid inconvenient or problem situations.
Attention:
These notices indicate possible damage to programs, devices, or data and is placed just
before the instruction or situation in which damage could occur.
Caution:
These notices indicate situations that can be potentially hazardous to you. A Caution notice is placed just
before a description of a potentially hazardous procedure, step, or situation.
Related publications
The following publications are listed below by part number followed by description and are avail-
able in Adobe Acrobat Portable Document Format (PDF) at http://www.mtssensors.com/
550752 - Product Specification, Model MC420 Analog Transmitter
551103 - Level Plus Accessories Catalog
For information about safe work procedures, refer to the following documentation:
National Electric Code ANSI/NFPA 70
CSA C22.1 Canadian Electrical Code
How this manual is organized
“Introduction”, provides an overview of the manual.
“Terms and Definitions”, provides definitions of terms used in this manual.
“Product Overview”, gives an overall product description for the Level Plus liquid-level transmitter, its specifications, use, output,
and electronics.
“Installation and Mounting”, provides detailed installation and mounting information.
“Electrical Connections and Wiring Procedures”, provides engineering specifications and wiring diagrams to assist in the
installation process.
“Maintenance and Field Service”, provides guidelines for general maintenance.
“Troubleshooting”, provides a list of symptoms, their possible cause and the action to be taken when troubleshooting the
transmitter.
Setup using magnet - provides procedures for setting 4 and 20 mA set points using supplied magnet.
Setup using HART®Field Communicator - provides procedures for setting 4 and 20 mA set points
Setup using MTS Field Setup Software - provides software installation, parameter setup, and calibration procedures.
“Agency Information” provides comprehensive listings of agency approvals and stan-
dards, installation drawings, labels and applicable protocols.
Getting information, help, and service
You can get the latest ordering information and software updates by visiting www.mtssensors.com website
General contact information, shipping and office hours are available on page i.

MTS Sensors
Level Plus®Liquid-Level Sensors - M-Series Model MC420 Analog Transmitter,
Operation and Installation Manual, Part No.: 550760 Revision E (EN) 02/2016iii
Table of
Contents
Model MC420 Operation and Installation Manual
Table of Contents
Contact information
General ........................................................................................i
Mailing and shipping address .....................................................i
Customer service ........................................................................i
Technical support and applications .............................................i
Office hours ................................................................................i
Remittance address ....................................................................i
Quote and contract terms and conditions ....................................i
Reference information
Notices used in this manual........................................................ ii
Related publications.................................................................... ii
How this manual is organized ..................................................... ii
Getting information, help, and service ........................................ ii
Introduction
Introduction............................................................... 1
Public website support portal ......................................... 1
Terms and definitions
Terms and definitions reference ...................................... 2
Product overview
Product overview ........................................................ 3
Industries.................................................................................... 3
Applications ................................................................................ 3
Features ...................................................................................... 3
Components .............................................................. 3
Housing ...................................................................................... 3
Outer pipe configuration ............................................................ 4
Floats ......................................................................................... 4
Internal electronics...................................................................... 4
Accessories ................................................................................ 4
Theory of operation...................................................... 5
Accuracy ................................................................. 5
Warranty ................................................................. 5
Model number identification........................................... 6
Product specifications .................................................. 7
Installation and mounting
Installation and Mounting ............................................. 8
Storage ................................................................... 8
Stilling wells and guide poles ........................................ 8
Installation................................................................ 8
Mounting ................................................................. 9
Electrical connections
Electrical connections and wiring procedures ..................... 10
Safety recommendations for installation ........................... 10
Recommended cable types ........................................... 11
Cable specifications ................................................................. 11
Grounding ............................................................... 12
Safety barriers for IS installation .................................... 12
Maintenance and field service
Maintenance and field service ....................................... 13
General maintenance and field service requirements ........... 13
Float maintenance .................................................................... 13
Field service ............................................................................. 13
Service / RMA policy ................................................................ 13
Troubleshooting
Troubleshooting procedures ......................................... 13
Setup
Quick set-up procedure ................................................ 14
Tools needed ............................................................................ 14
Setup using supplied magnet ........................................ 14
To set to Zero ........................................................................... 14
To set Span .............................................................................. 14
Setup using HART field communicator ............................. 15
Preparing the transmitter for re-calibration .............................. 15
Setting the low value ............................................................... 15
Setting the upper range value ................................................. 16
Setup using MTS Field Setup software ............................. 16
Using the MTS Field Setup software ........................................ 16
Advanced setup tab ................................................................. 17
Calibration tab ......................................................................... 18
Output tab ............................................................................... 18
Agency information
Agency approvals ...................................................... 19
FM/CSA and ATEX .................................................................... 19
Installation drawing ............................................................. 20
Notes ................................................................................... 21
Wiring and connections ....................................................... 23
Agency certifications ................................................. 24
ATEX ......................................................................................... 24
CSA.... ...................................................................................... 28
FM ........................................................................................... 30
NEPSI....................................................................................... 34
EC Declaration of Conformity.....................................................41

MTS Sensors
Level Plus®Liquid-Level Sensors - M-Series Model MC420 Analog Transmitter,
Operation and Installation Manual, Part No.: 550760 Revision E (EN) 02/2016
Introduction
MTS is recognized as the pioneer, innovator and leader in magnetostrictive sensing. The new Level Plus®M-Series transmitter design repre-
sents a continuation of our on-going effort to provide effective, innovative and reliable products to the Liquid Level marketplace.
This manual will provide the following information about the Level Plus Model MC420 analog transmitter:
• Terms and definitions
• Product overview
• Installation and mounting
• Electrical connections
• Maintenance and field service
• Troubleshooting
• Quick start-up guide
• Setup using the supplied magnet
• Setup using a HART®Field Communicator
• Setup using MTS Field Setup Software
• Agency information
• Product certifications
Public website support portal
Visit our support portal at http://www.mtssensors.com for:
• Building Level Plus M-Series Model MC420 analog transmitter model numbers
• Latest documentation releases
• Detailed ordering information
• Latest software updates
Model MC420 Operation and Installation Manual
Introduction
Introduction
1

MTS Sensors
Level Plus®Liquid-Level Sensors - M-Series Model MC420 Analog Transmitter,
Operation and Installation Manual, Part No.: 550760 Revision E (EN) 02/20162
Terms and definitions reference
H
HART®– a Bidirectional communication protocol that provides data
access between intelligent field instruments and host systems.
I
Interface – Noun; The measurement of the level of one liquid when
that liquid is below another liquid.
Interface – Adj.; The Software Graphical User Interface (GUI) that
allows the user to access software protocols (HART).
Intrinsic safety – ‘Intrinsically safe’ - Type of protection based on the
restriction of electrical energy within apparatus of interconnecting
wiring exposed to potentially explosive atmosphere to a level below
that which can cause ignition by either sparking or heating effects.
N
NEMA Type 4X – A product Enclosure intended for indoor or outdoor
use primarily to provide a degree of protection against corrosion,
windblown dust and rain, splashing water, and hose-directed water;
and to be undamaged by the formation of ice on the enclosure. They
are not intended to provide protection against conditions such as
internal condensation or internal icing.
NPT – U.S. standard defining tapered pipe threads used to join pipes
and fittings.
S
Specic Gravity – The density ratio of a liquid to the density of water
at the same conditions.
Terms and
Definitions
Model MC420 Operation and Installation Manual
Terms and Definitions

MTS Sensors
Level Plus®Liquid-Level Sensors - M-Series Model MC420 Analog Transmitter,
Operation and Installation Manual, Part No.: 550760 Revision E (EN) 02/2016 3
Product Overview
The Level Plus Model MC420 Liquid-Level transmitter is a continuous multi-functional magnetostrictive transmitter that provides product level
or interface level to the user via 4 to 20 mA current loop or HART. Magnetostrictive technology is one of the most accurate and repeatable
level technologies available to date. MTS is the inventor and purveyor of magnetostrictive technology and has been serving the level industry
for over 30 years.
INDUSTRIES APPLICATIONS FEATURES
Petrochemical
Chemical
Water and Wastewater
Mining
General Process
Industrial Chemicals
Solvents
Detergents and Soaps
Lubricating Oils
4 to 20 mA Output with HART®
Single Channel Output
Level Measurements
• Product
• Interface
No Scheduled Maintenance or Recalibration
High Accuracy and Repeatability
Intrinsically Safe (I.S.)
Components
The Level Plus Model MC420 liquid level transmitter consists of four main components; a housing, outer pipe, float, and electronics.
HOUSING
Level Plus Model MC420 transmitters comes standard with a NEMA Type 4X 316L stainless steel housing as shown below:
NEMA Type 4X 316L stainless-steel housing
¾ in. MNPT adjustable tting
Product
Overview
Model MC420 Operation and Installation Manual
Product Overview, Components

MTS Sensors
Level Plus®Liquid-Level Sensors - M-Series Model MC420 Analog Transmitter,
Operation and Installation Manual, Part No.: 550760 Revision E (EN) 02/20164
OUTER PIPE CONFIGURATION
The outer pipe is constructed of 316L (1.4404) stainless steel.
¾ in. MNPT adjustable tting
Figure 1. 5/8 in. diameter rigid outer pipe of 316L stainless steel
FLOATS
The Model MC420 comes standard with the float 251981-1 for FM and CSA approvals and float 251981- 2 for ATEX approvals. Alternative
floats can be ordered for other applications including detecting an interface level. When ordering alternative floats a stop collar is also required,
MTS part number 560369-1. To be able to accurately detect the interface level there needs to be a difference of at least 0.05 in specific gravities
between the product and interface liquids. For detailed information about floats, refer to the ‘Accessories Catalog’, MTS part number 551103.
For assistance with selecting a specific float for your application, please contact Technical Support with the following information:
• Specific gravity of liquid(s) being measured
• Process temperature • Process Opening Size
• Vessel pressure
INTERNAL ELECTRONICS
The electronics of the model MC420 are sealed and are not repairable. The electronics consist of a sensing element and a board set. The board
set contains two reed switches that allow for setting the 4 and 20 mA set points by using a supplied magnet and moving the float.
ACCESSORIES
MTS also offers a series of displays, housings, converters, and other accessories, please refer to the ‘Accessories Catalog’, MTS part number
551103.
Model MC420 Operation and Installation Manual
Product Overview
Product
Overview

MTS Sensors
Level Plus®Liquid-Level Sensors - M-Series Model MC420 Analog Transmitter,
Operation and Installation Manual, Part No.: 550760 Revision E (EN) 02/2016 5
Figure 2. Theory of operation
Accuracy
For magnetostrictive transmitters inherent accuracy is measured
in terms of non-linearity. Non-linearity is a measurement of any
imperfections in the waveguide that are reflected in the linearity of
the transmitter’s output. MTS tolerances reflect a maximum non-
linearity of 0.02% of full scale. MTS is able to achieve such strict
tolerances by manufacturing all of its own waveguide from a pro-
prietary alloy and testing 100% of all transmitters before shipping.
Warranty
Magnetostrictive M-Series transmitters precisely sense the position
of an external float by applying an interrogation pulse to a waveguide
medium. This current pulse causes a magnetic field to instantly sur-
round the waveguide. The magnet installed within the float also cre-
ates a magnetic field. Where the magnetic fields from the waveguide
and float intersect, a rotational force is created (waveguide twist).
This, in turn, creates a torsional-sonic pulse that travels along the
waveguide as shown in Figure 2.
The head of the transmitter houses the sensing circuit, which detects
the torsional-sonic pulse and converts it to an electrical pulse. The
distance from a reference point to the float is determined by measur-
ing the time interval between the initiating current pulse and the
return pulse and precisely knowing the speed of these pulses. The
time interval is converted into a level measurement.
Theory of operation
Important:
Contact Technical Support or Customer Service for assistance if you sus-
pect that the transmitter is not working correctly. Technical support can as-
sist you with troubleshooting, part replacement, and Returned Material
Authorization (RMA) information if required.
All M-Series transmitters come with a two year limited warranty
from the factory shipment date. A Return Materials Authorization
(RMA) number is required and must accompany any transmitter
returns. Any unit that was used in a process must be properly
cleaned in accordance with OSHA standards, before it is returned
to the factory. A Material Safety Data Sheet (MSDS) must also
accompany the transmitter that was used in any process.
Model MC420 Operation and Installation Manual
Product Overview
Product
Overview

MTS Sensors
Level Plus®Liquid-Level Sensors - M-Series Model MC420 Analog Transmitter,
Operation and Installation Manual, Part No.: 550760 Revision E (EN) 02/2016
Model MC420 Operation and Installation Manual
Product Overview
6
Model number identification
TRANSMITTER MODEL =M C 4 2 0 1 - 5
M-Series Model MC420 liquid-level transmitter
Comes with one standard product level float (part number 251981-X, see Standard float section below).
TRANSMITTER ORDER LENGTHS¤=6 - 8
Length Code Length Code Length Code
457 mm (18 in.) = 018 1829 mm (72 in.) = 072 3658 mm (144 in.) = 144
508 mm (20 in.) = 020 2134 mm (84 in.) = 084 3962 mm (156 in.) = 156
610 mm (24 in.) = 024 2438 mm (96 in.) = 096 4267 mm (168 in.) = 168
914 mm (36 in.) = 036 2743 mm (108 in.) = 108 4572 mm (180 in.) = 180
1219 mm (48 in.) = 048 3048 mm (120 in.) = 120 4877 mm (192 in.) = 192
1524 mm (60 in.) = 060 3353 mm (132 in.) = 132 5182 mm (204 in.) = 204
5486 mm (216 in.) = 216
¤ Standard Range/lengths 457 mm (18 in.) to 5486 mm (216 in.)
OPTIONAL ACCESSORIES =9 - 10
FM / CSA Approved
00 = Standard float (part no.: 251981-1) T0 = Standard float with Stainless-steel tag
F0 = Non-Standard float ¥‡ FT = Non-standard float with Stainless-steel tag ¥‡
ATEX / NEPSI Approved
0P = Standard float (part no.: 251981-2) with blue cable FP = Non-standard float with blue cable ¥‡
No Approval
0N = Standard float (part no.: 251981-2) with gray cable FN = Non-standard float with gray cable ¥‡
¥Non-standard floats must be ordered separately.
‡Requires a stop collar, part no.: 560369-1 (Which must be ordered separately)
APPROVAL AGENCY =11
F= FM Approval E= ATEX Approval
C= CSA Approval N= NEPSI Approval
X= No Approval
Product
Overview

MTS Sensors
Level Plus®Liquid-Level Sensors - M-Series Model MC420 Analog Transmitter,
Operation and Installation Manual, Part No.: 550760 Revision E (EN) 02/2016 7
Model MC420 Operation and Installation Manual
Product Overview
Product specifications
Parameters Specifications
LEVEL OUTPUT
Measured
variable: Product level and interface level
Output signal
and Protocol: 4 to 20 mA
with HART®
Order length: Rigid pipe: 457 mm (18 in.) to
5486 mm (216 in.) §
§Order length equals the measurement range plus
the inactive zone.
Non-linearity: 0.02% F.S. or 0.794 mm (1/32 in.)*
*Whichever is greater
Repeatability: 0.01% F.S. or 0.381 mm (0.015 in.)*
(any direction)
*Whichever is greater
ELECTRONICS
Input voltage: 10.5 to 36 Vdc maximum
28 Vdc maximum for I.S. approved
Fail safe: High (21.4 mA), Low (3.8 mA)
Reverse polarity
protection: Series diode
Lightning/
Transient
protection: Stage 1:
Line-to-ground surge suppression;
IEC 61000-4-5
Stage 2:
Line-to-line and line-to-ground transient
suppressors; IEC 61000-4-4
CALIBRATION
Zero adjust
range: Anywhere within the active length
Span adjust
range: Full scale to 152 mm (6 in.) from zero
Parameters Specifications
ENVIRONMENTAL
Enclosure rating: NEMA Type 4X
Humidity: 0 to 100% relative humidity,
noncondensing
Operating
temperatures:
Electronics*:
-34 °C (-30 °F) to 71 °C (160 ºF)
Sensing element:
-40 °C (-40 °F) to 125 °C (257 °F) ◊
◊Contact factory for specific temperature ranges.
*Consult Agency Approvals section for approval
specific ambient temperature rating.
Vessel pressure: Dependent on float pressure, contact
factory for more information
Materials: Wetted parts: 316L stainless steel
Non-wetted parts: 316L stainless steel
FIELD INSTALLATION
Housing
dimensions: NEMA Type 4X:
81 mm (3.2 in.) by 123 mm (4.85 in.) O.D.
Mounting: Rigid pipe:
¾ in. Adjustable MNPT fitting
Wiring: Integral cable:
4.5 m (15 ft.) 2-wire integral cable,
shielded
Electrical
Connections: NEMA Type 4X:
½ in. FNPT conduit opening
Product
Overview

MTS Sensors
Level Plus®Liquid-Level Sensors - M-Series Model MC420 Analog Transmitter,
Operation and Installation Manual, Part No.: 550760 Revision E (EN) 02/20168
Installation and mounting
This section contains information about storing your transmitter (prior to installation) and detailed procedures for installing and mounting your
transmitter.
Storage
If storage is required prior to installation, store indoors in a dry environment at ambient temperature range not exceeding -40 °C (-40 °F) to
71 °C (160 °F).
Stilling wells and guide poles
Level Plus transmitters can be mounted in slotted or unslotted stilling wells but a slotted stilling well is always preferred. Using a unslotted
stilling well will negatively affect performance of any level device as the level in the stilling well can differ from the level in the tank. The Level
Plus transmitter can also be installed to one side of the stilling well to also allow for sampling and manual gauging from the same opening as
the automatic tank gauging. Contact Technical Support for details.
Level Plus transmitters do not require a stilling well for installation. Our transmitters are installed in numerous tanks without stilling wells with
no loss in performance. A stilling well is highly recommended for agitated, turbulent, and/or fast filling tanks.
Installation
The installation procedures below are illustrated using the adjustable NPT fitting for a threaded flange mount.
RIGID PROBE
Tools Required:
• Channel lock pliers
• Common screwdriver
Caution:
It is recommended that assembly and mounting of this transmitter should not be performed alone. To ensure proper and safe assembly of the M-Series
transmitter, a minimum of two (2) individuals are recommended. Gloves are also recommended. In addition , PPE is required for work areas such as
safety shoes, safety glasses, hard hat, and fire resistant clothing.
Perform the following steps to Install the Model MC420 transmitter:
1. Remove the float sleeve and E-ring. With assistance, feed the rigid pipe through the hole of the removed tank flange until the flange is
positioned near the top of the transmitter. Insert the threaded portion of the adjustable fitting into the customer supplied flange and
tighten (apply pipe thread sealant if required). Be careful not to drop the flange as it can damage the transmitter.
2. Slide the float onto the rigid pipe. Install float sleeve and E-ring. Do not drop the float or allow it to free fall along the rigid pipe
as damage may result.
Note:
The stop collar can be removed or adjusted based on the float selected for the application. Please consult the factory for more information.
3. Slide float back down to the float sleeve to prevent it from free falling during installation into the tank. Insert the rigid pipe
(with float) through the tank opening and lower the transmitter/float assembly into the tank until it rests on the bottom. DO NOT
DROP OR DAMAGE THE PIPE.
4. Secure the flange onto the tank mount.
5. Pull the transmitter upward so the end plug is just resting on the floor of the tank. Tighten the adjustable fitting to hold the transmitter
in place.
6. Terminate the field wire cables noting proper wire orientation.
Model MC420 Operation and Installation Manual
Installation and Mounting
Installation &
Mounting

MTS Sensors
Level Plus®Liquid-Level Sensors - M-Series Model MC420 Analog Transmitter,
Operation and Installation Manual, Part No.: 550760 Revision E (EN) 02/2016 9
Mounting
The method of mounting the transmitter is dependent on the vessel or tank in which it is being used.
THREADED FLANGE MOUNTING
In most applications, the Model MC420 transmitter can be mounted directly to the tank or flange via a NPT threaded fitting, assuming there
is a proper threaded connection available. If the float will not fit through the flange opening when the flange is removed, there must be some
alternative means to mount the float on the transmitter from inside the vessel; this may require an access port nearby the entry point of the
transmitter as shown in Figure 3.
Model MC420 Operation and Installation Manual
Installation and Mounting
Installation &
Mounting
Riser
NPT fitting
Tank flange
(customer supplied
or ordered separately)
Float access
port
Tip of transmitter
Figure 3. Threaded flange mounting for rigid and flexible pipe

MTS Sensors
Level Plus®Liquid-Level Sensors - M-Series Model MC420 Analog Transmitter,
Operation and Installation Manual, Part No.: 550760 Revision E (EN) 02/201610
Electrical connections and wiring procedures
A typical intrinsically safe connection for the Level Plus Model MC420 transmitter includes protective safety barriers, a power supply and a
reading or monitoring device. Refer to Agency information for detailed information.
Safety recommendations for installation
Be sure to:
1. Always follow applicable local and national electrical codes and observe polarity when making electrical connections.
2. Never make electrical connections to the M-Series transmitter with power turned on.
3. Make sure that no wire strands are loose or sticking out of the terminal block connection which could short and cause a problem.
4. Make sure that no wire strands, including shield, are in contact with the electronic module enclosure.
5. The electronics module enclosure is grounded through internal circuitry and is electronically isolated from the explosion-proof housing.
Refer to the safe operating power chart (see Figure 4), which shows the relationship between loop resistance and operating voltage.
Model MC420 Operation and Installation Manual
Electrical Connections
Electrical Connections
800
750
700
650
600
550
500
450
400
350
300
250
200
150
100
50
0
10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40
INSUFFICIENT
OPERATING POWER
EXCESS POWER
Resistance
(Ohms)
Supply Voltage
(Volts DC)
Figure 4. Safe operating power chart

MTS Sensors
Level Plus®Liquid-Level Sensors - M-Series Model MC420 Analog Transmitter,
Operation and Installation Manual, Part No.: 550760 Revision E (EN) 02/2016 11
Recommended cable types
Refer to ‘Table 1’ below for general requirements of cable types for the Level Plus Model MC420 analog transmitter.
CABLE SPECIFICATIONS
Parameter Specification
Minimum cable size 24 AWG or heavier (0.51 mm diameter)
Contact factory for assistance selecting proper cable.
Cable type Single pair shielded or multiple pair with overall shield
Maximum cable length Twisted pair: 10,000 ft. (3,048 m)
Multiple twisted pair: 5,000 ft. (1,524 m)
Maximum cable length formula Use the following formula to determine the maximum cable length for a specific application:
Where: L = [(65 x 106) ÷ (R x C)] - [(Cf + 10,000) ÷ C]
L = Length in meters or feet
R = Resistance in ohms, current sense resistance plus barrier resistance
C = Cable capacitance in pF/ft, or pF/m
Cf = Maximum shunt capacitance of smart field devices in pF
Example:
Assume a high performing smart transmitter, a control system,
and a single pair of shielded wires.
R = 250 ohms
C = 50 pF/ 0,3 m (ft)
Cf = 5,000 pF
L = [(65 x 106) ÷ 250 x 50)] - [(5,000 + 10,000) ÷ 50]
L = 1,494 m (4,900 ft.)
Table 1. Cable specification and parameters
Model MC420 Operation and Installation Manual
Cable Types and Electrical Conduit Installation
Electrical Connections

MTS Sensors
Level Plus®Liquid-Level Sensors - M-Series Model MC420 Analog Transmitter,
Operation and Installation Manual, Part No.: 550760 Revision E (EN) 02/201612
Grounding
Note:
Grounding the transmitter through a threaded conduit connection does not provide sufficient ground.
The earth ground for the internal electronics is connected to the housing and the drain wire of the integral cable. The drain wire should be
connected to an earth ground for maximum surge protection.
Safety barriers for IS installation
Refer to Table 2 for entity parameters and Figure 5 for passive and active safety barrier types for Model MC420 transmitter installations.
Entity parameters
CSA Vmax = 36.1 Vdc
Imax = 118 mA
Ci = 0.0 µF
Li = 0.2 mH
FM/ATEX Vmax = 28 Vdc
Imax = 118 mA
Ci = resistivity low
Li = 0.2 mH
Supplier Type
Maximum
voltage
Maximum current
(each channel)
Maximum power
(each channel)
Maximum resistance
(each channel)
Number of
channels
STAHL 9001/51-280-091-141 28 Vdc 91 mA 637 mW 350Ω 1
Table 2. Safety barrier entity parameter references
Figure 5. Safety barrier connections
Non Hazardous Area Hazardous Area
Certified
Safety
Barrier
+ 24 Vdc Input Level
Transmitter
Non Hazardous Area Hazardous Area
Certified
Safety Barriers
24 Vdc
Supply-
Voltage
I (A)
4-20
mA
I (A)
4-20
mA
24 Vdc
Supply-
Voltage
I.S. Ground connection
Certified
Safety Barriers
I.S. Ground connection
Transmitter
Transmitter 2
+ 1 to 5 Vdc Output
Load 250 Ohm
0.1%, 2.5 W
Power and signal common
Model MC420 Operation and Installation Manual
Grounding and Safety Barriers
Electrical Connections

MTS Sensors
Level Plus®Liquid-Level Sensors - M-Series Model MC420 Analog Transmitter,
Operation and Installation Manual, Part No.: 550760 Revision E (EN) 02/2016 13
Maintenance & Field Service
Maintenance and field service
This section contains information about post installation maintenance and provides an overview of MTS Sensors’ repair and replacement
procedures.
General maintenance and field service requirements
Notes:
Please contact Technical Support or Customer Service for help when damage occurs in order to obtain a return materials authorization (RMA) number.
Packages without a RMA number may be rejected. Any unit that was used in a process must be properly cleaned in accordance with OSHA standards,
before it is returned to the factory. A Material Safety Data Sheet (MSDS) must accompany material that was used in any media.
FLOAT MAINTENANCE
Level Plus M-Series transmitters use magnetostrictive technology and only have one moving part—the float. This technology ensures no
scheduled maintenance or recalibration is required. However, MTS recommends that you check the transmitter pipe annually for build up of
process material. Floats should move freely along the pipe. If they do not, routine cleaning should be performed.
FIELD SERVICE
The Model MC420 transmitter is not repairable. Troubleshooting may be performed but if there is any damage to the MC420 transmitter a new
one must be ordered.
SERVICE / RMA POLICY
If the customer suspects their transmitter is damaged or not functioning correctly, call MTS Technical Support for further instruction. If it is
necessary to return the transmitter to the factory, an RMA number is required and can only be issued by Technical Support. Product returns
that do not include an RMA will be returned to the customer. MTS evaluates the transmitter and advises the customer whether a repair or
replacement is necessary and any cost that might be incurred. If the customer declines repair/replacement or the transmitter has no fault found,
the unit is sent back as is and the customer is charged with a standard evaluation fee.
If the transmitter is under warranty and a manufacturer’s defect is detected, there will be no cost to the customer for repair or replacement. If
the transmitter is out of warranty or if the customer has damaged the transmitter, a repair or replacement quote will be provided. In specific
cases where the transmitter can not be removed and returned to the factory for evaluation, field evaluations can be performed in the field by an
MTS technician. If field evaluation must be performed, the customer is responsible for all expenses incurred for travel, evaluation, parts and
repair time. However, if the transmitter is under warranty and the problem is due to a manufacturer’s defect, there is no cost to the customer
for replacement parts. To discuss all service options, contact Technical Support.
Troubleshooting
The table below contains troubleshooting information for the Model MC420 analog transmitter.
TROUBLESHOOTING PROCEDURES
Symptom Possible Cause Action
No communication with transmitter No power Check voltage at transmitter
Wiring incorrect Reference installation drawing
(see ‘Electrical connections’)
Wrong software Confirm correct software
Output in Alarm (3.8 mA or 21.4 mA) Float not recognized Confirm that the float is attached
Float is in the dead zone Raise float to see if the error stops
Table 3. Troubleshooting reference
Model MC420 Operation and Installation Manual
Maintenance and Field Service

MTS Sensors
Level Plus®Liquid-Level Sensors - M-Series Model MC420 Analog Transmitter,
Operation and Installation Manual, Part No.: 550760 Revision E (EN) 02/2016
Model MC420 Operation and Installation Manual
Setup
14
Setup
Quick set-up procedure
Note:
Output will vary depending on the location of the 4 and 20 mA set points.
Tools Needed:
Setup using supplied magnet
Note:
To ensure that the new settings are correct, place a current meter in line with the MC420 so that is is visible during the calibration process.
The Model MC420 transmitter comes calibrated from the factory with standard 4 mA setpoint equal to 76 mm (3in.) and 20 mA setpoint equal
to order length minus 127 mm (5 in.). To change the Zero (4 mA) or Span (20 mA) settings, use the following procedure.
To set the Span (20 mA) setpoint
1. Move the float to the desired span (20 mA) location.
2. Locate the recess marked (S) on the underside of the base
plate.
3. Using the MTS provided magnet, briefly tap the recess marked
(S) to enable calibration.
4. Place the magnet in the recess marked (S) for 3 seconds, then
release.
• 24 Vdc linear regulated power supply
• Current Meter
QUICK START-UP PROCEDURE
1. Connect 24 Vdc power supply
2. Turn on power supply
3. Connect Current Meter to loop.
4. Move the float to the tip of the pipe and verify 4 mA output
5. Move the float to the top of the pipe and verify 20 mA output
6. Turn off power and disconnect power supply
7. Install in tank
8. Connect power and turn on
To set the Zero (4 mA) setpoint
1. Place float in desired position for the zero (4 mA) point.
2. Locate the recess marked (Z) on the underside of the
baseplate.
3. Using the MTS provided magnet briefly tap the (Z) to enable
calibration.
4. Place the magnet in the recess marked (Z) and hold for 3
seconds, then release.

MTS Sensors
Level Plus®Liquid-Level Sensors - M-Series Model MC420 Analog Transmitter,
Operation and Installation Manual, Part No.: 550760 Revision E (EN) 02/2016 15
Setup
Setup using HART Field Communicator
Refer to the documentation that comes with the Rosemount Model 275 and 375 Field Communicator for specific sensor calibration informa-
tion. This section describes how the HART protocol is applied to the Level Plus Model MC420 transmitter only.
Using the HART interface allows for calibration without having to remove the transmitter from the process and position the floats. You can
perform this function by using HART commands 35 and 65.
Calibration set points for level are given as the absolute displacement (in the appropriate units) from the tip of the sensor pipe. For example, if
the Zero (LRV) position for level 1 is given as 5 inches, the transmitter will produce 4 mA when the float is 5 inches from the tip of the sensor
pipe. If the Span (URV) position for level 1 is given as 30 inches, the transmitter will produce 20 mA when the float is 35 inches from the top
of the sensor pipe. To calibrate the temperature set points, the Zero (LRV) and Span (URV) points are given in degrees. For temperature, the
Zero (LRV) value (in degrees) must always be less than the Span (URV) value (in degrees).
PREPARING THE TRANSMITTER FOR RE-CALIBRATION
The Model MC420 transmitter can be re-calibrated by using the model 275 and 375 Field Communicator. Complete the following procedure to
reset the zero and span values for loop 1 (only loop 1 can be calibrated with the HART Field Communicator using the generic XMTR type driver).
To access both loops as well as other parameters, the MTS device driver must be purchased and installed in to the 275/375 field communicator.
For more information about the HART device driver, go to HARTcomm.org.
Attention:
DO NOT enter a high value that exceeds the active length of the sensor.
Before you begin, perform the following steps:
1. Connect the transmitter to a clean 24 Vdc power supply. Use a linear supply, switching types do not provide ripple-free power. HART
cannot tolerate more than a 25 mV voltage ripple.
2. If the unit is installed in a live application, place your automatic controllers in manual mode and be advised that the output current will
change during calibration.
3. Follow safe working procedures for working on live equipment in a hazardous location before you remove the housing cover.
4. Connect the HART Field Communicator to the loop.
5. Press the black and white I/O button on the HART terminal. The HART terminal will perform an automatic self test. The Main window
displays. If the device is not connected properly, the message “No device found” displays.
6. In the Main window, press the Key #1, the Device Setup window displays.
7. In the Device setup window, press Key #3. The Basic Setup window displays.
8. In the Basic Setup window, press Key #3. The Range Values window displays.
SETTING THE LOW VALUE
Complete the following steps to set the low value:
1. To set the low value, Process Variable, Low Range Value (PV LRV) to 4 mA, select Key #1. The PV LRV window displays the current low
value. Below the highlighted value located under the current value, key in the low value you want (example 3.00 in. is shown; if 4 inches
is the value you want, key in 4.) then, press Enter (F4) located below the LCD display.
2. To write the changed lower value to memory, press the Send key.
3. Two Warning messages will display before the new values take affect; if your new low values are correct, respond to the Warning
messages by pressing OK when prompted. This action resets the Low Range Value, or 4 mA position into the transmitter’s memory.
4. Go back to the Range Values window to verify that the new parameters have been accepted into the transmitter’s memory.
5. Do one of the following:
Model MC420 Operation and Installation Manual
Setup