MTS Systems Temposonics II LDT Guide rapide
1
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Sensors Division
Temposonics®II
Linear Displacement Transducer
Installation and Instruction Manual for
DIGITAL SYSTEMS
P/N 550033 Rev. F
Part No. 550033 Rev. E
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GENERAL INFORMATION
MTS PHONE NUMBERS
Application questions: 800-633-7609
Service: 800-248-0532
Fax: 919-677-0200
SHIPPING ADDRESS
MTS Systems Corporation
Sensors Division
3001 Sheldon Drive
Cary, North Carolina 27513
HOURS
Monday - Thursday
7:30 a.m. to 6:30 p.m. EST/EDT
Friday
7:30 a.m. to 5:00 p.m. EST/EDT
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TABLE OF CONTENTS
Section Page
1 INTRODUCTION 1
1.1 Theory of Operation/Magnetostriction 1
1.2 Temposonics II LDT Specifications 2
1.3 Specifications for Temposonics II LDTs over 180 inches 3
2 TEMPOSONICS II LDT INSTALLATION 4
2.1 Types of Transducer Supports 6
2.1.1 Loop Supports 6
2.1.2 Channel Supports 7
2.1.3 Guide Pipe Supports 7
2.2 Open Magnets 8
2.3 Spring Loading and Tensioning 8
2.4 Cylinder Installation 8
2.5 Installing Magnets 11
3 GROUNDING 12
4 DIGITAL SYSTEM CONFIGURATIONS 13
4.1 Specifications of Digital System Components 14
4.2 Digital Personality Module 15
4.2.1 Synchronous (External Interrogating) Mode 15
4.2.2 Asynchronous (Internal Interrogating) Mode 16
4.2.3 Operation During Loss of Signal 16
4.3 RS422 Personality Module 17
4.4 Digital Counter Card 18
4.4.1 Scaling 19
4.4.2 Spare Parts/Inventory Considerations 19
5 DIGITAL SYSTEM ADJUSTMENTS 20
6 ELECTRONIC CONNECTIONS 21
6.1 General 21
6.2 Transducer Connections 22
6.3 Digital Counter Card Connections 24
6.3.1 Latch Pulse 25
6.3.2 Protocol 25
6.3.3 Latch Inhibit Input 25
6.4 Counter Cards - Natural Binary Output 26
6.5 Counter Cards - BCD Output 29
6.6 System Calibration 32
6.6.1 Re-zeroing the Digital Counter Card 32
6.6.2 Scaling the Digital Counter Card 37
APPENDICES
A How to Specify Systems with Digital Output 38
B Digital Personality Module (DPM) Programming Procedure (Asynchronous Mode) 45
C Modification to the Digital Interface Box 49
D Troubleshooting 51
1
1. Introduction to the Temposonics II Linear Displacement Transducer (LDT)
The Temposonics II LDT precisely senses the position of an external magnet to measure displacement with a high
degree of accuracy and resolution. Using the principle of magnetostriction (see Section 1.1, below), the
Temposonics II LDT measures the time interval between the initiation of an interrogation pulse and the detection
of a return pulse. A variety of interface devices use the data derived from these two pulses and generates an ana-
log or digital output to represent position.
1.1 Theory of Operation/Magnetostriction
The interrogation pulse travels the length of the transducer by a conducting wire threaded through a hol-
low waveguide. The waveguide is spring loaded within the transducer rod and exhibits the physical prop-
erty of magnetostriction. When the magnetic field of the interrogation pulse interacts with the stationary
magnetic field of the external magnet, a torsional strain pulse or “twist” is produced in the waveguide.
This strain pulse travels in both directions, away from the magnet. At the end of the rod, the strain pulse
is damped within the “dead zone” (2.5 inches in length). At the head of the transducer, two magnetically
coupled sensing coils are attached to strain sensitive tapes. The tapes translate the strain pulse through
coils to an electrical “return pulse”. The coil voltage is then amplified in the head electronics before it is
sent to various measuring devices as the conditioned “return pulse”.
Figure 1-1
Waveguide Interaction
Reference
magnetic field
Conducting element
Interaction of magnetic
fields causes
waveguide to twist
Magnetic field from interrogation pulse
Waveguide
twist
Waveguide Sensing coil
Bias magnet
Strain tape
External reference magnet
Waveguide enclosure
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1.2 Temposonics II LDT Specifications
Parameter Specifications
Input Voltage: ± 12 to ± 15 Vdc
Current Draw: Transducer Only:
± 15 Vdc at 100 mA maximum, 25 mA minimum
(current draw varies with magnet position, maximum draw occurs when magnet is at 2 in.
(50.6 mm) from the flange and minimum update time is being utilized)
Transducer with:
• RS-422 Personality Module (RPM): ± 12 to ±15 Vdc at 140 mA maximum
• Digital Personality Module (DPM): + 15 Vdc at 150 mA maximum, 75 mA minimum, - 15 Vdc
at 100 mA maximum, 25 mA minimum
Displacement: Up to 25 feet (7620 millimeters)
Dead Space: 2.5 inches (63.5 millimeters) for stroke lengths up to 179.9 in.
3 inches (76.2 millimeters) for stroke lengths ≥180 in.
Electronics Enclosure: IP-67
Non-linearity: < ± 0.05% of full scale or ± 0.002 inch (±0.05 mm), whichever is greater
Resolution:
1 ÷ [gradient x crystal freq. (mHz) x circulation]; maximum resolution: 0.006 mm or 0.00025 in.
Repeatability: Equals resolution
Hysteresis: 0.0008 inch (0.02 mm) maximum
Update Time: Resolution and Stroke dependent
Minimum = [Stroke (specified in inches) + 3] x 9.1 µs
Operating Temperature
Head Electronics: - 40 to 150°F (- 40 to 66°C)
Transducer Rod: - 40 to 185°F (- 40 to 85°C)
Operating Pressure: 3000 psi continuous, 8000 psi static
Digital Outputs (absolute) TTL level, nominal 0 and 5V, true high, parallel transmission
Specifications are subject to change without notice. Consult MTS for verification of specifications critical to your application.
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1.3 Specifications for Temposonics II LDTs over 180 Inches
Below is a list of specifications that pertain to Temposonics II transducers with active stroke lengths of
180 inches (4572 mm) to 300 inches (7620 mm). Special versions of the Analog Output Modules (AOM)
and Digital Interface Boxes (DIB) are required to interface with transducers over 180 inches in length.
Contact an MTS Applications Engineer for details before ordering.
Parameter Specification
Parameter Specifications
Input Voltage: • Maximum: ± 15 Vdc, ± 5% at 100 mA
• Minimum: ± 15 Vdc at 25 mA
(current draw varies with magnet position, maximum draw occurs when magnet is 2 inches
(50.8 mm) from the flange and minimum update time is being used)
Dead Space: 3 in. (76.2 mm)
Cable Length: • Maximum cable length for neuter version transducer (i.e., Temposonics II without an
integrated Personality Module) which requires the use of external interface electronics
(Analog output Module, Digital Interface Box or other signal conditioners) is 250 ft.
• Maximum cable length for Temposonics II transducers with Personality Modules
RPM: 1640 feet (500 meters) using external interrogation
DPM: 300 feet (90 meters) using external interrogation
Magnet Requirement: Part Number: 201554 or 201553 ONLY
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2. Temposonics II LDT Installation
Before beginning installation, be sure you know the following dimensions (as illustrated in Figures 2-1 to 2-3a-c.):
• Null Space
• Stroke
• Dead Zone
Figure 2-1
Temposonics II Dimension
Figure 2-2
Temposonics II Connector/Cable Clearance Requirements
Temposonics II with
Molded Connector/Cable Assembly
Temposonics II with
Field Instalable Connector
Temposonics II with
Integral Cable
2.5 in. minimum
(clearance for connector
and cable bend)
1.25 in.
minimum
3/4-16 UNF-3A Thread
0.38 in. DIA
(9.65 mm)
Standard Null
(2.0 in., 50 mm)
0.38 in. (9.65 mm)
1.36 in.
(34.54 mm)
End Plug,
Flush 0.83 in.
(9.65 mm)
0.03 in. (0.76 mm)
Hex
1.75 in. (44.45 mm) across flats
2.13 in.
(54 mm)
Flange to Tip
Stroke Length
(specified by customer)
1.57 in. dia.
(39.87 mm)
1.75 in. dia.
(44.45 mm)
2.50 in.
(63.50 mm)
Dead Zone
2.50 in.
(63.50 mm)
for stroke
lengths up to
179.9 in;
3 in. (76.2 mm)
for strokes
≥180 in.
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1. Use the 3/4 inch (19 mm), 16 UNF thread of the transducer to mount it at the selected location. Leave room to
access the hex head. If a pressure or moisture seal is required, install an O-ring (type MS 28778-8 is recom-
mended) in the special groove. Use the hex head to tighten the transducer assembly.
2. Install the permanent magnet over the LDT rod. Mount the permanent magnet to the movable device whose
displacement will be measured. To minimize the effect of magnetic materials (i.e. iron, steel, etc.) on the mag-
netic field of the permanent magnet, ensure the minimum spacing requirements are met as shown in Figure 2-
4. (Any non-magnetic materials can be in direct contact with the permanent magnet without affecting perfor-
mance.)
Figure 2-3a
Minimum Magnet Clearance Using Magnetic Supports
Figure 2-3b Figure 2-3c
Minimum Null Space Using Non-Magnetic Support Minimum Null Space Using Magnetic Support
Notes:
1. The magnet must not contact ferromagnetic materials (such as iron or steel). Clearances are required between the surface of the magnet
and ferromagnetic material, as shown. Non-ferrous material (such as copper, brass, or 300 series stainless steel) may contact the magnet
without affecting transducer performance.
2. Standard Null Space is 2 inches. There is no maximum limit for Null Space. Less then 2 inches can be specified if magnet clearances meet
requirements illustrated above.
5/8 in.
Minimum
Ferromagnetic Support
Magnet
A = 5/8 in. plus support thickness
A
NON-Ferromagnetic Support
Magnet
A = 1 in., minimum to clear threads
Threads
A
1/8 in.
Minimum 5/8 in.
Minimum
Magnet
Tip Head
Ferromagnetic Material
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4. Move the permanent magnet full-scale to check that it moves freely. If not (if the magnet rubs on the transduc-
er) you can correct this by mounting a support bracket to the end of the transducer. Long transducers may
need additional supports to be attached to the transducer rod. Transducer supports are described later in this
section.
2.1 Types of Transducer Supports
Long transducers (48 inches or longer) may require supports to maintain proper alignment between the
transducer rod and the permanent magnet. When transducer rod supports are used, special, open-ended
permanent magnets are required.
Transducer supports attached to the active stroke length must be made of a non-ferrous material, thin
enough to permit the permanent magnet to pass without obstruction. Because the permanent magnet
does not enter the dead zone, supports connected within the dead zone may be made of any material.
The main types of supports are loop, channel, and guide pipe supports.
2.1.1 Loop Supports
Loop supports are fabricated from non-ferrous materials, thin enough to permit free movement of
the magnet. Loop supports are recommended for straight transducers. They may be used alone or
with channel supports. Figure 2-4 illustrates the fabrication of a loop support.
Figure 2-4
Loop Support
NOTE:
When open magnets are used, ensure the
transducer rod remains within the inside
diameter of the magnet throughout the
length of the stroke. If the transducer rod
is allowed to enter the cut out area of an
open magnet, the transducer signal
could attenuate or be lost. See Figure 2-7.
TransducerRod
0.375in.
I.D.
FrontView
Side View
NOTE:
Clearance between the magnet and the
transducer rod is not critical. However,
contact between the components will
cause wear over time. The installation of
supports or readjustment of the supports
is recommended if the magnet contacts
the transducer rod.
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2.1.2 Channel Supports
Channel supports, being typically straight, are normally used with rigid transducers. A channel
support consists of a straight channel with loop supports mounted at intervals. The loop supports
are required to keep the transducer within the channel. Figure 2-5 shows a channel support.
Channel supports are available from various manufacturers or may be fabricated.
Figure 2-5
Channel Support
2.1.3 Guide Pipe Supports
Guide pipe supports are normally used for flexible transducers. A guide pipe support is construct-
ed of non-ferrous material, straight or bent to the desired shape. As shown in Figure 2-6, both
inside and outside dimensions of the pipe are critical:
• Because the transducer rod is installed inside the pipe, the inside diameter of the pipe must be
large enough to clear the rod.
Figure. 2-6
Guide Pipe Support
• The outside diameter of the pipe must be small enough to clear the magnet.
Refer to pipe manufacturers’ specifications and dimensions (schedule 10, 40, etc.) to select the
appropriate size pipe. Guide pipe is typically supported at each end of the pipe.
Magnet
• Part No.: 201553 or
• Part No.: 251416
Guide Pipe
Rod
Magnet
• Part No.: 201553 or
• Part No.: 251416
Loop Support
Rod
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