Omega Products LD320 Installation Manual

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LD320, LD620, LD621, LD630 Series

DISPLACEMENT TRANSDUCERS

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The information contained in this document is believed to be correct, but OMEGA Engineering, Inc. accepts no liability for any errors it contains, and
reserves the right to alter specications without notice.
WARNING: These products are not designed for use in, and should not be used for, human applications.

M-4345/0209

M-4345/1209

3

Index

Index

Section Title Page

1.0 Introduction . . . . . . . . . . . . . . . . . . 4

2.0 Installation . . . . . . . . . . . . . . . . . . . 5

2.1 Mounting the Transducer . . . . . . . . 5

2.2 Cores . . . . . . . . . . . . . . . . . . . . . . . 6

2.3 Carriers . . . . . . . . . . . . . . . . . . . . . 6

2.3.1 Guided Carriers . . . . . . . . . . . . . . . 6

2.3.2 Ball Tips . . . . . . . . . . . . . . . . . . . . 6

2.3.3 Springs . . . . . . . . . . . . . . . . . . . . . 7

2.3.4 Universal Joints . . . . . . . . . . . . . . . 7

2.3.5 Thread Mount Option . . . . . . . . . . . 8

2.3.6 Submersible Option . . . . . . . . . . . . 8

Section Title Page

3.0 Electrical Interfaces . . . . . . . . . . . . 9

3.1 Standard LVDT . . . . . . . . . . . . . . . 9

3.2 4-20MA . . . . . . . . . . . . . . . . . . . . . 10

3.3 DC Voltage . . . . . . . . . . . . . . . . . . 10

3.4 Digital . . . . . . . . . . . . . . . . . . . . . . 11

4.0 Conditioning . . . . . . . . . . . . . . . . . 12

5.0 Marking . . . . . . . . . . . . . . . . . . . . 12

M-4345/1209

4

1.0: Introduction

1.0: Introduction

Omega's new LD320, LD620, LD621, LD630 range
of displacement transducers forms a wide range
of transducers offering measurement ranges from
±2.5 mm to ±150 mm. The LD320, LD620, LD621,
LD630 offers the advantage of a shorter body than
traditional displacement transducers. Furthermore,
four electrical output types are provided; these are
standard LVDT, 4-20 mA, isolated DC voltage and
digital outputs.

All models in the LD320, LD620, LD621, LD630
can be configured with guided or unguided
core for frictionless operation. The wide bore
to core clearance of the LD320, LD620, LD621,
LD630 makes installation and alignment a very
easy process. The guided versions are provided
with polymer bearings for high rigidity and are
available with special tips, universal joint fittings
and return springs. The universal joints are useful
in applications where lever movements induce
variations in the motion straightness.

The rugged construction of the LD320, LD620,
LD621, LD630 and the options of IP65, IP67, IP68
and submersible (100 bar) rating makes these
transducers a cost-effective product suitable for use

in harsh environments.

GENERAL SPECIFICATION

Storage
Temperature

LVDT Variants -40 °C to +120 °C
4-20 mA, DC and
Digital Variants

-20 °C to +85 °C

Operating
Temperature

LVDT Variants -40 °C to +120 °C
4-20 mA and DC
Variants

0 °C to +65 °C

Digital variants
(Transducer only)

-40 °C to +120 C

Linearity 0.2% FSO
For full specification please refer to the Product
Datasheet or catalog.

Typical Mechanical Configurations

M-4345/1209

5

2.0: Installation

2.0: Installation

2.1: Mounting the Transducer
LVDT based transducers are a reliable and proven
technology that is well established in all areas of
manufacturing and control industries. The majority
of the associated problems experienced with their
application and use are totally avoidable, particularly
if sufficient thought is given during the initial design
stages of equipment to the positioning and clamping
methods employed for these feedback elements.

LVDT’s, being of inductive nature, are susceptible to
some degree to the influence of magnetic fields.

The LD320, LD620, LD621, LD630 transducers
contain an integral magnetic screen that reduces
these effects. However, the transducer should be
positioned well away from electric motors, relays
and permanent magnets. If this is not possible
checks should be made on the influence of such
items.

Clamping of the coil assembly should be carefully
considered. Some example methods are shown
below. Ideally the body of the transducers should
be clamped centrally in a pinch or yoke type clamp,
manufactured from a low conductivity, non-magnetic
material.

Irrespective of clamping method, care must be
taken not to over-tighten retaining screws as
distortion of the body may prove damaging to the
integrity of the transducer and adversely affect the
geometry of the installation.

If the LVDT is to be mounted on equipment subject
to high ”g” then, dependent on the direction of these
forces, it may be advantageous to consider end to
end clamping in preference to over body clamping.

For Universal Joint fittings maximum tightening
torque on the ball = 2.5 Nm.