MTS Sensors Level Plus M Series Specification sheet

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

MTS Sensors
Level Plus®Liquid-Level Sensors M-Series Model USTD II Digital Transmitter
Operation and Installation Manual, Document Number 550980 Revision F, 02/2016
Contact
Information
Model USTD II Operation and Installation Manual
Contact Information
GERMANY
GENERAL:
Tel.: [phone]
Fax: [phone]
e-mail: [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]
e-mail: [email protected]
http://www.mtssensors.com
JAPAN
GENERAL:
Tel.: [phone]
Fax: [phone]
e-mail: [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]
E-mail: [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]
E-mail: [email protected]
TECHNICAL SUPPORT AND APPLICATIONS:
24 Hour Emergency Technical Support
Tel: [phone]
e-mail: [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/fileadmin/media/pdfs/Terms_
and_Conditions.pdf and are incorporated by reference 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/index and click the Quote/Contract Terms
and Conditions link at the bottom of the page to download the PDF.
i

MTS Sensors
Level Plus®Liquid-Level Sensors M-Series Model USTD II Digital Transmitter
Operation and Installation Manual, Document Number 550980 Revision F, 02/2016
Reference
Information
Model USTD II Operation and Installation Manual
Reference Information
ii
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/
550949 - Product Specification, Level Plus USTD II
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 and procedures for replacing the Model USTD II level
transmitter.
“Troubleshooting”, provides a list of symptoms, their possible cause and the action to be taken when troubleshooting the transmitter.
“Quick Start-Up Guide”, provides a list of steps to quickly set up your USTD II.
“DDA Protocol”, provides the DDA hardware and software environment overviews.
“Agency Information” provides comprehensive listings of agency approvals and standards, 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 USTD II Digital Transmitter
Operation and Installation Manual, Document Number 550980 Revision F, 02/2016
Table of
Contents
Model USTD II 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
Housings..................................................................................... 3
Outer pipe configurations ........................................................... 4
Floats ......................................................................................... 5
Internal electronics...................................................................... 5
Accessories ................................................................................ 5
Theory of operation...................................................... 5
Accuracy ................................................................. 5
Warranty ................................................................. 5
Model number identification........................................... 6
Product specifications .................................................. 7
Installation and mounting
Installation and mounting ............................................. 8
Storage ................................................................... 8
Installation................................................................ 8
Mounting ................................................................. 9
External mounting....................................................................... 9
Internal mounting ..................................................................... 10
Electrical connections and wiring
Electrical connections and wiring procedures ..................... 11
Safety recommendations for installation ........................... 11
Industrial topologies .................................................. 11
Point-to-point ........................................................................... 11
Bus with spurs.......................................................................... 11
Tree.... ...................................................................................... 11
Daisy chain .............................................................................. 11
Recommended cable types ........................................... 11
Grounding ............................................................... 12
Safety barriers .......................................................... 12
Maintenance and field service
General maintenance and field service
requirements ........................................................ 13
Float maintenance .................................................................... 13
Field service ............................................................................. 13
Service / RMA policy ................................................................ 13
Troubleshooting
Troubleshooting procedures ......................................... 14
Quick start-up guide
Quick start-up guide.................................................... 14
Before you begin ...................................................................... 14
Quick start-up procedure ......................................................... 14
DDA user interface
Communication protocol .............................................. 15
Command timing ....................................................... 15
Command 02 ............................................................ 15
USTD II Command Set ................................................ 16
USTD II error codes .................................................... 17
Digital setup software installation, setup and calibration ...... 18
Data from device tab ................................................................ 18
Agency Information
Agency approvals ...................................................... 20
FM........................................................................ 20
ATEX ...................................................................... 20
NEPSI..................................................................... 20
Hazardous area installation .......................................... 21
FM ............................................................................................ 21
Installation drawings ............................................................ 21
Notes .................................................................................... 22
Wiring connections .............................................................. 22
Labels ................................................................................... 23
ATEX ........................................................................................ 24
Installation drawings ............................................................. 24
Notes .................................................................................... 25
Wiring connections ............................................................... 25
Labels ................................................................................... 26
NEPSI. ...................................................................................... 27
Installation drawing .............................................................. 27
Notes .................................................................................... 28
Wiring connections ............................................................... 28
Labels ................................................................................... 29
FM certificate ........................................................... 30
ATEX certificate ......................................................... 34
NEPSI certificates ...................................................... 37
iii

MTS Sensors
Level Plus®Liquid-Level Sensors M-Series Model USTD II Digital Transmitter
Operation and Installation Manual, Document Number 550980 Revision F, 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 USTD II digital transmitter:
• Terms and definitions
• Product overview
• Installation and mounting
• Electrical connections and wiring procedures
• Maintenance and field service
• Troubleshooting
• Quick start-up guide
• DDA interface
• Product certification
Public website support portal
Visit our support portal at http://www.mtssensors.com for:
• Building Level Plus M-Series model numbers
• Latest documentation releases
• Detailed ordering information
• Latest software updates
1
Model USTD II Operation and Installation Manual
Introduction
Introduction

MTS Sensors
Level Plus®Liquid-Level Sensors M-Series Model USTD II Digital Transmitter
Operation and Installation Manual, Document Number 550980 Revision F, 02/2016
Model USTD II Operation and Installation Manual
Terms and Definitions
2
Terms and definitions reference
D
DDA – ‘Direct Digital Access’ – The proprietary digital protocol
developed by MTS for use in intrinsically safe areas.
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 (DDA, MODBUS).
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

MTS Sensors
Level Plus®Liquid-Level Sensors M-Series Model USTD II Digital Transmitter
Operation and Installation Manual, Document Number 550980 Revision F, 02/2016 3
Product overview
The Level Plus Model USTD II Liquid-Level transmitter is a continuous multi-functional magnetostrictive transmitter that provides product
level, interface level, and temperature to the user via DDA output. 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
Petroleum
Liquid petroleum gas
Chemical
Wastewater
Underground storage tanks
Fuels and Solvents
Sump
3-in-1 measurement
- Product level
- Interface level
- Temperature level
No scheduled maintenance or recalibration
Non-linearity ±1 mm
Intrinsically Safe
Components
The Level Plus Model USTD II liquid level transmitter consists of four main components; a housing, outer pipe, float, and electronics.
HOUSING
Level Plus Model USTD II transmitters are available with a NEMA Type 4X 316L stainless steel, housing as shown below:
NEMA Type 4X 316L stainless-steel housing
Housing dimension reference
Order length
737 mm (29 in.) to 3785 mm (149 in.)
132 mm (5.20 in.)
51 mm
(2 in.) O.D.
15.9 mm
(0.63 in.) dia
51 mm
(2 in.)
Mounting zone
Measuring range
32.2 mm
(1.25 in.)
Inactive zone
Ground lug
Pipe
Ground lug
Product
Overview
Model USTD II Operation and Installation Manual
Product Overview

MTS Sensors
Level Plus®Liquid-Level Sensors M-Series Model USTD II Digital Transmitter
Operation and Installation Manual, Document Number 550980 Revision F, 02/2016
Model USTD II Operation and Installation Manual
Product Overview
4
Product
Overview
OUTER PIPE CONFIGURATIONS
The outer pipe is constructed as shown below.
Order length
737 mm (29 in.) to 3785 mm (149 in.)
132 mm (5.20 in.)
51 mm
(2 in.) O.D.
15.9 mm
(0.63 in.) dia
51 mm
(2 in.)
Mounting zone
Measuring range
32.2 mm
(1.25 in.)
Inactive zone
Ground lug
Pipe
Ground lug
Figure 1 5/8 in. diameter rigid outer pipe of 316L stainless steel

MTS Sensors
Level Plus®Liquid-Level Sensors M-Series Model USTD II Digital Transmitter
Operation and Installation Manual, Document Number 550980 Revision F, 02/2016 5
Product
Overview
FLOATS
Level Plus Model USTD II transmitters offer numerous floats for
different applications such as stainless steel, 3-A sanitary, Hastelloy,
Teflon, and Nitrophyl for both product level and interface level. 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
All transmitters come with two electronic components of a sensing
element and a board set. All sensing elements are rigid. The board
set consists of a top board and bottom board. A temperature sens-
ing function is standard with the Model USTD II transmitter. The
temperature sensing device is a digital thermometer (DT) mounted
inside the transmitter’s pipe assembly.
ACCESSORIES
MTS also offers a series of displays, housings, converters, and other accessories, please refer to the ‘Accessories Catalog’, MTS part number
551103.
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 mea-
suring 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.
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 ± 0.5 mm. MTS is able to achieve such strict tolerances
by manufacturing all of its own waveguide from a proprietary alloy
and testing 100% of all transmitters before shipping.
Theory of operation
Warranty
Important:
Contact Technical Support or Customer Service for assistance if you
suspect that the transmitter is not working correctly. Technical support
can assist 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 fac-
tory. A Material Safety Data Sheet (MSDS) must also accompany the
transmitter that was used in any process.
Model USTD II Operation and Installation Manual
Product Overview
Figure 2 Theory of operation

MTS Sensors
Level Plus®Liquid-Level Sensors M-Series Model USTD II Digital Transmitter
Operation and Installation Manual, Document Number 550980 Revision F, 02/2016
Product
Overview
Model USTD II Operation and Installation Manual
Product Overview
6
Model number identification for ATEX approval
TRANSMITTER MODEL =U S T D I I 1 - 6
M-Series Model USTD II liquid-level transmitter
UNIT OF MEASURE = 7
M= Metric (millimeters)
U= US Customary (inches)
TRANSMITTER ORDER LENGTH = 8 - 11
Length Code
Millimeters = XXXX (737 mm to 3785 mm)
Inches = 0XXX (29 in. to 149 in.)
MOUNTING AND CATEGORY OF APPARATUS = 12
H= Fill tube mounting (hanger with centering spacers) FM Approved
A= Flange mounting (¾ in. MNPT adjustable fitting) FM Approved
6= Flange mounting (¾ in. MNPT adjustable fitting) ATEX Approved
MOUNTING TYPE = 13
S= Standard product without cable (FM Approved)
9= Standard product without cable (ATEX Approved)
7= Cable gland and integral blue cable (ATEX Approved)
STANDARD FEATURES
Five DT's, evenly spaced
Data output format (USTD type)
USTD II CABLE ASSEMBLY OPTION
Description Part number
5 m straight connector cable (ATEX) 402486
2 m straight connector cable (FM) 530049
2 m 90° connector cable (FM) 370481

MTS Sensors
Level Plus®Liquid-Level Sensors M-Series Model USTD II Digital Transmitter
Operation and Installation Manual, Document Number 550980 Revision F, 02/2016 7
Product
Overview
Model USTD II Operation and Installation Manual
Product Overview
Parameters Specifications
LEVEL OUTPUT
Measured
variable: Product level and interface level
Output signal /
Protocol: DDA/USTD
Order length: Rigid pipe: 737 mm (29 in.) to
3785 mm (149 in.) §∆
§Order length equals the distance from the bottom
of the housing to the tip of the pipe, (including
the inactive zone).
∆Contact factory for longer lengths.
Non-linearity: ± 0.5 mm (0.02 in.)
Repeatability: 0.001% F.S. or 0.381 mm (0.015 in.)◊
◊Whichever is greater.
TEMPERATURE OUTPUT
Measured
variable:
Average and multipoint temperatures
Up to 5
Accuracy: ± 0.28 °C (± 0.5 °F)
ELECTRONICS
Input voltage: 10.5 to 30.1 Vdc
28 Vdc maximum for I.S. ATEX approval
Fail safe: High, Full scale
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: IP 68
Humidity: 0 to 100% relative humidity,
noncondensing
Operating
temperatures:
Electronics*:
-40 °C (-40 °F) to 71 °C (160 °F)
Sensing element:
-40 °C (-40 °F) to 125 °C (257 °F)
Temperature element:
-40 °C (-40 °F) to 105 °C (221 °F)
*Consult Agency Approvals section for approval
specific ambient temperature rating.
Vessel pressure: 4 bar (60 psi)
Materials: Wetted parts: 316L stainless steel
Non wetted parts: 316L stainless steel
FIELD INSTALLATION
Housing
dimensions:
51 mm (2 in.) dia. by
132 mm (5.2 in.) height
Mounting: ¾ in. Adjustable NPT fitting (ATEX, FM) or
Fill tube hanger (FM only)
Wiring: 4-wire, plus earth ground
Electrical
Connections: 5-pin M12 connector
Product specifications

MTS Sensors
Level Plus®Liquid-Level Sensors M-Series Model USTD II Digital Transmitter
Operation and Installation Manual, Document Number 550980 Revision F, 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).
Installation
The installation procedures below are illustrated using the adjustable NPT fitting for a external mount. The procedures will have to be slightly
adjusted if using a internal 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 USTD II Digital transmitter:
1. Remove the 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 product float onto the rigid pipe. Slide the interface float onto the rigid pipe. Do not drop the float(s) or allow them to free fall
along the rigid pipe as damage may result. Install E-ring.
3. Slide floats back down to the E-ring to prevent them from free falling during installation into the tank. Insert the rigid pipe
(with floats) 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. Connect wire and cable accordingly.
Installation &
Mounting
Model USTD II Operation and Installation Manual
Installation & Mounting

MTS Sensors
Level Plus®Liquid-Level Sensors M-Series Model USTD II Digital Transmitter
Operation and Installation Manual, Document Number 550980 Revision F, 02/2016 9
Installation &
Mounting
Mounting
The method of mounting a Level Plus M-Series transmitter is dependent on the vessel or tank in which it is being used and what type of
transmitter is being used. There are two typical methods for mounting, external and internal.
EXTERNAL MOUNT
MTS offers the Level Plus Model USTD II transmitter configured with a rigid pipe constructed of 316L stainless steel. The rigid
pipe configuration can be ordered in lengths from 737 mm (29 in.) to 3785 mm (149 in.). The Model USTD II can be installed us-
ing a flange mount (see illustration below). The flange mount allows the transmitter to be installed external to the tank through
a flange with a ¾ in. MNPT Adjustable fitting which is FM and ATEX approved. The NPT fitting allows the transmitter mount to be adjusted
(within an inch) if the tank height and order length are not exactly equal.
The ‘Measuring range’ of the Model USTD II transmitter is equal to the ‘Order length’ minus the ‘Mounting zone’ at 51 mm (2.0 in.) and the
‘Inactive zone’ of 32 mm (1.25 in.). The Model USTD II transmitter can be ordered with a single product float or can include the optional
interface float. Average and individual temperature measurement from five positions are included.
Figure 3. External mounting example
Model USTD II Operation and Installation Manual
Installation & Mounting

MTS Sensors
Level Plus®Liquid-Level Sensors M-Series Model USTD II Digital Transmitter
Operation and Installation Manual, Document Number 550980 Revision F, 02/2016
Model USTD II Operation and Installation Manual
Installation & Mounting
10
INTERNAL MOUNT
MTS offers the Level Plus Model USTD II transmitter configured with a rigid pipe constructed of 316L stainless steel. The rigid pipe configura-
tion can be ordered in lengths from 737 mm (29 in.) to 3785 mm (149 in.). The Model USTD II can be installed using a Fill Tube Hanger mount
(see illustration below). The fill tube hanger mount allows the transmitter to be installed in the fill tube or riser pipe within the tank and is FM
approved.
The ‘Measuring range’ of the Model USTD II transmitter is equal to the ‘Order length’ minus the ‘Inactive zone’ of 32 mm (1.25 in.). The overall
length of the transmitter in the tank is equal to the ‘Order length’ plus the height of the housing and bracket at 176.5 mm (6.95 in.) The Model
USTD II transmitter can be ordered with a single product float, or can include the optional interface float. Average and individual temperature
measurement from five positions are included.
** The fill tube hanger mount is not available with ATEX approval
Spacer
(Customer supplied)
Stainless-steel
Rigid pipe
45 mm (1.77 in.)
Inactive Zone
32 mm (1.25 in.)
Order length
737 mm (29 in.) to
3785 mm (149 in.)
Measuring range
USTD II
O.D.
51 mm
(2 in.)
102 mm
(4 in.) dia.
Fill tube hanger
Spacer width
98 mm (3.87 in.)
176.5 mm
(6.95 in.)
Figure 4. Internal mounting example
Installation &
Mounting

MTS Sensors
Level Plus®Liquid-Level Sensors M-Series Model USTD II Digital Transmitter
Operation and Installation Manual, Document Number 550980 Revision F, 02/2016 11
Electrical connections and wiring procedures
A typical intrinsically safe connection for the Level Plus USTD II 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
Always follow applicable local and national electrical codes and observe polarity when making electrical connections. Never make electrical
connections to the M-Series transmitter with power turned on. Make sure that no wire strands are loose or sticking out of the terminal block
connection which could short and cause a problem. Make sure that no wire strands, including shield, are in contact with the electronic module
enclosure. The electronics module enclosure is grounded through internal circuitry and electrically isolated from the enclosure.
Industrial topologies
There are four topologies described and illustrated below. However, the daisy chain topology is not recommended by MTS.
POINT-TO-POINT
The point-to-point topology consists of having only one device on
the loop as shown in Figure 5. This topology is not usually used
with a bus network since it does not take advantage of placing
multiple devices on a loop.
BUS WITH SPURS
Figure 6. Bus with spurs topology
Figure 7. Tree topology
Figure 8. Daisy-chain topology
Recommended cable types
Listed below are general requirements of cable types for the Level
Plus Model USTD II digital transmitter.
Cable recommendation:
PLC
PLC
PLC
Installation &
Mounting
Model USTD II Operation and Installation Manual
Installation & Mounting
The bus with spurs topology has a main trunk cable that has each
device connected via its own spur at a junction box as shown in
Figure 6. The bus with spurs and tree topologies can also be used
together to form a hybrid topology.
TREE ALIGNMENT
The tree topology is very similar to the bus with spurs topology
with the main difference of having a common junction box for all
of the transmitters as shown in Figure 7. Bus with spurs and tree
topologies can also be used together to form a hybrid topology.
DAISY CHAIN
The daisy-chain topology utilizes a single cable that is connected to
all of the transmitters with the cable being interconnected at each
field device. When using this topology make sure that the wiring
practice allows for one transmitter to be disconnected without
disconnecting the entire loop as shown in Figure 8. MTS does not
suggest using the daisy-chain topology.
Figure 5. Point-to-point topology
PLC

MTS Sensors
Level Plus®Liquid-Level Sensors M-Series Model USTD II Digital Transmitter
Operation and Installation Manual, Document Number 550980 Revision F, 02/201612
• Shielded, twisted pair, 24 AWG or heavier
• Minimum 85 °C temperature rating.
• Minimum 0.010 in. (0.25 mm) insulation thickness
• 30 picofarads/foot or less. (see Notes).
Notes:
1. The return conductor for the power supply circuit is connected to the shield at the safety barrier ground terminal. When determining the capacitance of
cable for the power supply circuit, use the manufacturer’s capacitance specifications shown for one conductor and the other conductor connected to
the shield.
2. Most cable manufacturers do not list inductance properties for cables. Where the inductance properties are unavailable, ISA RP12.6 (Installation of
Intrinsically Safe Instrument Systems in Class I Hazardous Locations) recommends the use of 0.2 µH (micro henries) per foot as a value for cable
inductance.
3. Termination and biasing of RS-485 data lines are as follows:
• Biasing - Each M-Series transmitter has internal high impedance biasing resistors (30K Ω) on both RS-485 data lines. No
additional biasing resistors should be present on the connecting devices (PLC, DCS, PC, converter).
• Termination - Each M-Series transmitter has an internal termination resistor (100K Ω) installed across the RS-485 signal lines.
No additional termination resistors are necessary in the connecting devices (PLC, DCS, PC, converter).
Grounding
The USTD II must have a dedicated earth ground connected to the housings’ ground lug. Refer to Agency information for more information.
Safety barriers
Entity Parameter
FM Vmax =28 Vdc
Imax = 200 mA
Ci = 0µF
Li = 0 mH
ATEX Ui = 28 Vdc
Ii = 200 mA
Ci = Negligibly low
Li = Negligibly low
Supplier Type Maximum voltage Maximum current Maximum power Maximum resistance
Number of
channels
STAHL 9001/01-280-165-101 28 Vdc 165 mA 1155 mW 198Ω 1
STAHL 9001/01-280-110-101 28 Vdc 110 mA 770 mW 294Ω 1
MTL 728 28 Vdc 93 mA 651 mW 300Ω 1
MTL 728+ 28 Vdc 93 mA 651 mW 300Ω 1
MTL 7028+ 28 Vdc 93 mA 651 mW 300Ω 1
MTL 7128+ 28 Vdc 93 mA 651 mW 300Ω 1
MTL 7728+ 28 Vdc 93 mA 651 mW 300Ω 1
Table 2. Power supply (+24 Vdc)
Supplier Type Maximum voltage
Maximum current
(each channel)
Maximum power
(each channel)
Maximum resistance
(each channel)
Number of
channels
STAHL 9001/01-086-010-101 8.6 Vdc 10 mA 21.5 mW 963Ω 1
STAHL 9002/11-120-024-001 12 Vdc 12 mA 70 mW 1156Ω 2
MTL 764+ 12 Vdc 24 mA 72 mW 1075Ω 2
Table 3. Communication lines (TX/RX+ and TX/RX-)
Model USTD II Operation and Installation Manual
Electrical Connections and Wiring
Connections &
Wiring

MTS Sensors
Level Plus®Liquid-Level Sensors M-Series Model USTD II Digital Transmitter
Operation and Installation Manual, Document Number 550980 Revision F, 02/2016 13
Connections &
Wiring
Model USTD II Operation and Installation Manual
Maintenance and 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
If damage does occur to a M-Series transmitter, the transmitter can be serviced in the field with replacement parts. Please contact Technical
Support for detailed steps of field replacement.
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.

MTS Sensors
Level Plus®Liquid-Level Sensors M-Series Model USTD II Digital Transmitter
Operation and Installation Manual, Document Number 550980 Revision F, 02/201614
Troubleshooting
Table 4 below contains troubleshooting information for the Model USTD II digital 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 and wiring’)
Wrong address DDA factory default is ‘192 ’
Wrong software Confirm correct software
Wrong protocol Confirm software and transmitter are
same protocol
Missing magnet error Float not recognized Confirm that the float is attached
Float is in the dead zone Raise float to see if the error stops
Trigger level error Gain needs to be adjusted Consult Factory
SE is damaged Consult Factory
Min. trigger level too high Consult Factory
Table 4. Troubleshooting reference
Model USTD II Operation and Installation Manual
Troubleshooting Procedures
Quick start-up guide
BEFORE YOU BEGIN
Note:
You must use a RS-485 converter with “Send Data Control” and the
M-Series Set-up Software to ensure proper operation.
Example:
B & B Electronics 485BAT3 (815-433-5100 www.bb-elec.com).
Default communication parameters
USTD: 4800 BAUD 8, E, 1
Troubleshooting
Procedures
QUICK START-UP PROCEDURE
1. Connect +24 Vdc to terminals.
2. Connect data lines to terminals.
3. Connect the PC (or other device) to data lines.
(If you are using a PC, use a RS-232 to RS-485 converter. See Note above for more information.)
4. Turn on power to the transmitter.
5. Start the M-Series Setup Software. Click the ‘Data From Device’ tab. Click the ‘Device’ pull down menu (located in the upper right
corner of the window) to verify communications using factory default address ‘192 ’for DDA.
6. Change the address to one that is suitable for the installation network.
7. Verify proper operation of product and or interface floats and temperature.
8. Turn off power to the transmitter.
9. Remove data lines.
10. Install the transmitter into the vessel (see Installation and mounting).
11. Reconnect power and data lines.
12. Verify communications with the host system (repeat step 5).
13. Calibrate current tank level (optional). Setup is complete.

MTS Sensors
Level Plus®Liquid-Level Sensors M-Series Model USTD II Digital Transmitter
Operation and Installation Manual, Document Number 550980 Revision F, 02/2016
DDA user interface
COMMUNICATION PROTOCOL
The communication is based on a RS485 network which allows up to 32 transceivers to be connected. The transmission speed is 4800 baud.
Each word consists of 11 bits; 1 start, 1 stop, 8 data and 1 even parity bit.
The communication follows a master/slave principle. All gauges operate in a passive mode until the master requests a certain action from
one of them.
When an action is requested, the first byte the master sends is an address byte in the range of C0-FD hex. The second byte is a command
byte which tells the addressed gauge what action to take.
For example C2 0A requests the following action: “sensor name C2 measure the first float and send the result in 0.1 inch resolution.
First the addressed gauge sends an acknowledgement by repeating these two bytes (echo). Then the gauge performs the required action
and sends the data as an ASCII string. To provide an efficient integrity test, the gauge calculates a checksum and sends it as a 5 digit ASCII
decimal value to the master. This value is the 2’s complement of the sum of the data string bytes (including STX and ETX ). The master
adds this value to the sum of the received bytes (except the echo) for a result of zero.
COMMUNICATION TIMING
The byte time is given by the transmission speed (4800 baud) as .3ms. The bytes can be transmitted without any additional delay between
them, but if there is, it should not exceed 5ms. When the command byte is also transmitted, the master should disable its driver to allow the
gauge to send the echo.
The time between the end of command byte transmission and the echo can vary from 19 ms to 25 ms. The time between the echo and the
beginning of the data transmission can vary between zero (when the function is aborted because of an error) and TMAX which is given in the
USTD II command set table on page 16.
COMMAND 02
All gauges are delivered with the address C0. To configure your network of gauges, address C0 must be changed by using the command 02.
You can configure your network using two methods. Programming the network using the following method requires the serial number for
each sensor (access code) that is mounted on each tank:
To select a single gauge, use address FF and command byte 02. An access code string (which is equal to the serial number and unique to
each sensor), is transmitted by the master. The following is an example of the access code: <SOH>FN12345678<EOT>.
If a sensor receives its access code it responds with the current address <STX>192<ETX> (+ checksum) to flag that it is ready to receive
the new address. Within 500ms the master can now transmit the new address for xample <SOH>193<EOT> (C1). When the new address is
successfully written in the sensors nonvolatile memory (EEPROM) the sensor transmits an <ACK> (+ checksum).
The second method is to reserve the address C0 for gauges that are added to the network. Then the gauges can be linked to the network one
by one, while an intelligent software reads the access code in the device information of the newly added or replaced gauge (C0 4F) and uses
this to program the desired address.
15
DDA User
Interface
Model USTD II Operation and Installation Manual
DDA User Interface