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User’s Guide
Shop online at
omega.com
e-mail: [email protected]
For latest product manuals:
www.omegamanual.info
LD200/300/400/500
Series Linear Variable
Displacement Transducers
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omega.com [email protected]
Servicing North America:
U.S.A. Omega Engineering, Inc.
Headquarters: Toll-Free: 1-800-826-6342 (USA & Canada only)
Customer Service: 1-800-622-2378 (USA & Canada only)
Engineering Service: 1-800-872-9436 (USA & Canada only)
Tel: (203) 359-1660 Fax: (203) 359-7700
e-mail: [email protected]
For Other Locations Visit omega.com/worldwide
TABLE OF CONTENTS
LD 200/300/400/500
SECTION 1
Description
SECTION 2
Unpacking
SECTION 3
Operation
SECTION 4
Transducer Mounting Information
SECTION 5
LVDT Selection Factors
SECTION 6
Wiring
SECTION 7
Specications
The information contained in this document is believed to be correct, but OMEGA accepts no liability for any errors it contains,
and reserves the right to alter specifications without notice.
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SECTION 1 - DESCRIPTION
The Omega LD 200 / 300 / 400 / 500 series of linear variable displacement will measure a wide range of displacement. The following models
are available:
MODEL NO. RANGE (mm) FEATURES
1.25
2.5
LD200 - 5.0
7.5
10
15
25
50
LD300 - 100
150
250
300
1.0
LD400 - 2.5
5.0
1.0
LD500 - 2.5
5.0
1.25
2.5
5.0
7.5
10
15
25
50
100
150
250
300
1.0
2.5
5.0
1.0
2.5
5.0
RUGGED - Designed for use on ma-
chinetoolsandvehicleswhereinnite
resolution and high repeatability are
very important characteristics.
LONG STROKE AC - High accuracy
and our longest stroke up to ±:12”.
Armatures are spring loaded up to
6” length. AC operation provides the
highest accuracy and performance.
MINIATURE DC - Supplied with delrin
bearings these miniature transducers
provide near frictionless motion to
detect the smallest displacement
PRECISION GAGING - Designed for
industrial automation, these transducers have hardened steel shafts,
O-ring seals and titanium push rods
to give highly repeatable readings.
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SECTION 2 - UNPACKING
Remove the Packing list and verify that all equipment has been received. If
there are any questions about the shipment, please call OMEGA Customer
Service Department at 1-800-622-2378.
Upon receipt of shipment, inspect the container and equipment for any
signs of damage. Take particular note of any evidence of rough handing in
transit. Immediately report any damage to the shipping agent.
The carrier will not honor any claims unless all shipping material is saved
for their examination. After examining and removing contents, save packing material and carton in the event reshipping is necessary.
SECTION 3 - OPERATION
OMEGA's LD200/300/400/500 displacement transducers are essentially
miniature transformers, have one primary winding, two symmetrically
wound secondary coils, and an armature core that is free to move along
the linear axis in precision bearing guides. A push rod connects the
monitored component to the armature core, such that the displacement of
thatcomponentmovesthecoreo-center.
A voltage is applied across the primary winding and the EMF induced
in the magnetic circuit produces corresponding voltages in the second-
arywindings,whichareconnecteddierentiallytoproduceazerooutput
signal when the armature core is in its central position. When the core is
displacedocenterineitherdirection,theeciencyoftransformation
in the secondary winding on that side is increased and decreases in the
other secondary coil. This results in a positive (+ve) voltage output signal
whenthecoremovesocenterinonedirectionandanegative(-ve)
voltage output in the other direction. The intensity of the output signal is
directly proportional to the linear displacement of the core and, hence, of
the monitored component.
NOTE
SECTION 4 TRANSDUCER MOUNTING INFORMATION
CLAMPING (DISPLACEMENT TRANSDUCERS)
The clamp should be non-metallic whenever possible. If a metal clamp is
used, care should be taken to ensure that it is linear over the entire body
of the transducer.
Mountingatoneendofthetransducercangiverisetonon-linearityofve
per cent (5%) or worse.
Where possible, all large metal parts should be at least six inches (6") from
thetransducersatalltimestoreducetheireectonthetransducer.
PROBE TIPS (GAGING TRANSDUCERS)
Care should be taken not to overtighten the probe tip of the transducer.
Thetipshouldbengertightonlyandathreadlockingcompoundusedon
tip to prevent movement. Any overtightening is likely to damage the internal mechanism of the transducer and cause poor repeatability. The tip
used should be carefully selected to prevent excessive side pressure.
The maximum step height that the tip is to climb should not exceed 0.3R
of the tip.
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PROBE CLAMPING (GAGING TRANSDUCERS)
When clamping the probe, care should be taken not to exceed 50 Kg point
load at any point on the body of the transducer. Exceeding this may cause
distortion of the case and result in damage to the internal components
The most common method of clamping the transducer is to use a split
collar or sleeve arrangement to spread the load over as large an area
as possible.
CABLE OUTLET (ALL TRANSDUCERS)
Maximum Bend Radius for the cable should not be less than six inches
(6”) for long life. The cable should be reinforced with Spiroband or a protective sleeve where it is likely to sustain damage.
Support for the cable should be provided at the point where it exists for the
transducer body whenever possible.
Continuousexingofanypartofthecableshouldbeavoided.
SECTION 5 - LVDT SELECTION FACTORS
Particular attention should be made to the following factors when selecting
anLVDTforaspecicapplication:
• Nominal transducer linear stroke (core displacement)
• Non-linearity
• Typical sensitivity
• Primary excitation requirements (voltage and frequency)
• Residual voltage at null core position
• Electrical terminations (wire leads, connector, cable length)
• Environment (temperature, humidity, vibration, etc.)
• Core dimensions and weight
SECTION 6 - WIRING
The transducer cables are color coded. Connections should be made as
indicated. Refer to Figure 1.
Figure 1. Wiring Diagram
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WARRANTY/DISCLAIMER
OMEGA ENGINEERING, INC. warrants this unit to be free of defects in materials and workmanship for
a period of 13 months from date of purchase. OMEGA’s WARRANTY adds an additional one (1) month
grace period to the normal one (1) year product warranty to cover handling and shipping time. This
ensures that OMEGA’s customers receive maximum coverage on each product.
If the unit malfunctions, it must be returned to the factory for evaluation. OMEGA’s Customer Service
Departmentwill issuean AuthorizedReturn (AR)number immediatelyupon phoneor writtenrequest.
Upon examination by OMEGA, if the unit is found to be defective, it will be repaired or replaced at no
charge. OMEGA’s WARRANTY does not apply to defects resulting from any action of the purchaser,
including but not limited to mishandling, improper interfacing, operation outside of design limits,
improper repair, orunauthorizedmodification.This WARRANTY is VOID if the unit shows evidence
of having been tampered with or shows evidence of having been damaged as a result of excessive
corrosion; or current, heat, moisture or vibration; improper specification; misapplication; misuse or
other operating conditions outside of OMEGA’s control. Components in which wear is not warranted,
include but are not limited to contact points, fuses, and triacs.
OMEGA is pleased to offer suggestions on the use of its various products. However,
OMEGA neither assumes responsibility for any omissions or errors nor assumes liability for any
damages that result from the use of its products in accordance with information provided by OMEGA,
either verbal or written. OMEGA warrants only that the parts manufactured by the company will be as
specified and free of defects. OMEGA MAKES NO OTHER WARRANTIES OR REPRESENTATIONS
OF ANY KIND WHATSOEVER, EXPRESSED OR IMPLIED, EXCEPT THAT OF TITLE, AND ALL
IMPLIED WARRANTIES INCLUDING ANY WARRANTY OF MERCHANTABILITY AND FITNESS
FOR A PARTICULAR PURPOSE ARE HEREBY DISCLAIMED. LIMITATION OF LIABILITY: The
remedies of purchaser set forth herein are exclusive, and the total liability of OMEGA with respect to
this order, whether based on contract, warranty, negligence, indemnification, strict liability or otherwise,
shall not exceed the purchase price of the component upon which liability is based. In no event shall
OMEGA be liable for consequential, incidental or special damages.
CONDITIONS: Equipment sold by OMEGA is not intended to be used, nor shall it be used: (1) as
a “Basic Component” under 10 CFR 21 (NRC), used in or with any nuclear installation or activity; or
(2) in medical applications or used on humans. Should any Product(s) be used in or with any nuclear
installation or activity, medical application, used on humans, or misused in any way, OMEGA assumes
no responsibility as set forth in our basic WARRANTY / DISCLAIMER language, and, additionally,
purchaser will indemnify OMEGA and hold OMEGA harmless from any liability or damage whatsoever
arising out of the use of the Product(s) in such a manner.
Direct all warranty and repair requests/inquiries to the OMEGA Customer Service Department.
RETURN REQUESTS/INQUIRIES
BEFORE RETURNING ANY PRODUCT(S) TO OMEGA, PURCHASER MUST OBTAIN AN
AUTHORIZED RETURN (AR) NUMBER FROM OMEGA’S CUSTOMER SERVICE DEPARTMENT (IN
ORDER TO AVOID PROCESSING DELAYS). The assigned AR number should then be marked on the
outside of the return package and on any correspondence.
The purchaser is responsible for shipping charges, freight, insurance and proper packaging to prevent
breakage in transit.
FOR WARRANTY RETURNS, please have the
following information available BEFORE
contacting OMEGA:
1. Purchase Order number under which
the product was PURCHASED,
2. Model and serial number of the product under
warranty, and
3. Repair instructions and/or specific
problems relative to the product.
OMEGA’s policy is to make running changes, not model changes, whenever an improvement is possible.
This affords our customers the latest in technology and engineering.
OMEGA is a trademark of OMEGA ENGINEERING, INC.
© Copyright 2017 OMEGA ENGINEERING, INC. All rights reserved. This document may not be copied, photocopied, repro-
duced, translated, or reduced to any electronic medium or machine-readable form, in whole or in part, without the prior written
consent of OMEGA ENGINEERING, INC.
FOR NON-WARRANTY REPAIRS,
consult
OMEGA for current repair charges. Have the
following information available BEFORE
contacting OMEGA:
1. Purchase Order number to cover the
COST of the repair,
2. Model and serial number of the product, and
3. Repair instructions and/or specific problems
relative to the product.
Page 8
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Process Measurement and Control?
OMEGA…Of Course!
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