Omega Products LCKD Installation Manual

omega.com

e-mail: [e-mail]

For latest product manuals:

omegamanual.info

User’s Guide

LCKD SERIES

Subminiature Compression

Load Cells

MADE IN

Shop online at

LCKD SERIES
Subminiature Compression Load Cells

1

Each LCKD Series Load Cell incorporates a small printed
circuit board into the load cell’s lead wire. DO NOT
remove this board or cut the cable between the
compensation board and load cell. Removal of this board
voids the calibration and warranty of the load cell.

General

The OMEGA®LCKD Series subminiature compression load cells are
compression-only units that are highly cost-effective. To ensure
excellent long-term stability and reliability in severe environments, the
LCKD Series utilize high quality strain gages, precision gaging
techniques and all stainless steel construction. These units have a load
button machined as an integral part of the basic load cell. The load cell
is designed to operate by mounting on a flat surface. The LCKD must
rest on a flat surface the same diameter as the D

1

dimension for proper

operation.

Shunt Calibration

The LCKD Series are highly accurate millivolt output type load cells
with shunt calibrator for quick calibration checks. Shunt calibration
allows the user to install and calibrate the instrument in the field
without the use of a dead weight tester. A 59 kilohm resistor is shorted
across negative excitation and negative signal output at the factory,
which produces a simulated millivolt signal out of the transducer. The
shunt calibration signal is equivalent to a simulated pressure of:

Shunt Cal mV/V

Simulated Load = x Full Scale Load

Calibration Factor mV/V

Example: Model LCKD

Where:

Calibration Factor - 2.0315 mV/V
Shunt Cal - 1.4962 mV/V

Simulated Load = 1.4962

x 50 = 36.85

2.0315

To set up the transducer in the field, follow these steps:

1. Connect transducer excitation terminals to dc power supply.

2. Connect transducer signal output terminals to readout instrument
(DVM, Analog meter, etc.)

3. Turn power on.

4. Null transducer signal output with zero adjust potentiometer on meter.

5. Short a 59 kilohm resistor across negative excitation and negative
signal output.

NOTE

LCKD SERIES

Subminiature Compression Load Cells

2

6. Adjust the span potentiometer until the readout instrument reads the
simulated load as computed above (or that percent of full scale
pressure).

7. Remove 59 kilohm resistor and repeat steps 4 to 6 if necessary.
(Span and Zero adjust pots may interact).

8. The meter is now calibrated.

Specifications:

Signal Output: See calibration sheet

Linearity and Hysteresis: ±0.25% full scale

Repeatability: ±0.1% full scale

Compensated Temperature Range: 60 to 160°F (16 to 71°C)

Operating Temperature Range: -65° to 225°F (-54 to 107°C)

Temperature Effect: Zero 0.01% full scale/°F;

Span 0.01% of reading/°F

Bridge Resistance: 350 ohm bonded foil gage

Excitation Voltage: 5 Vdc, 7 Vdc max.

Full Scale Deflection: 0.001" to 0.003"

Safe Overload: 150%

Construction: Stainless Steel

Electrical: 5 ft. four conductor cable

Weight: <0.5 oz.

WIRING CODE

RED (+) EXCITATION
BLACK (–) EXCITATION
GREEN (–) OUTPUT
WHITE (+) OUTPUT

IMPORTANT:

Every load cell comes with a calibration sheet stating its full scale output, and
this manual. Please save both.

D2

DIA.

R Radius

F OD

OF WIRE

C

D1

DIA.

H

B

RANGES

1 kg; 25; 50 lbs
100; 250 lbs

500; 1000 lbs

D1" D2" H" B" C" F" R"

0.38 0.09 0.12 0.03 0.04 0.05 0.25

0.50 0.12 0.15 0.02 0.06 0.05 0.50

0.75 0.24 0.25 0.03 0.10 0.05 4.0

DIMENSIONS

M4087-0305

It is the policy of OMEGA Engineering, Inc. to comply with all worldwide safety and EMC/EMI regulations that apply. OMEGA is constantly pursuing
certification of its products to the European New Approach Directives. OMEGA will add the CE mark to every appropriate device upon certification.

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.
WARNING: These products are not designed for use in, and should not be used for, human applications.

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 Department will issue an
Authorized Return (AR) number immediately upon phone or written request. 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, or
unauthorized modification. 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.

RETURN REQUESTS / INQUIRIES

Direct all warranty and repair requests/inquiries to the OMEGA Customer Service Department. 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 informa-

tion 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.

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.

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 registered trademark of OMEGA ENGINEERING, INC.
© Copyright 2005 OMEGA ENGINEERING, INC. All rights reserved. This document may not be copied, photocopied, reproduced, 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.

Servicing North America:

U.S.A.: One Omega Drive, Box 4047

ISO 9001 Certified Stamford, CT 06907-0047

Tel: [phone] FAX: [phone]
e-mail: [e-mail]

Canada: 976 Bergar

Laval (Quebec) H7L 5A1, Canada
Tel: [phone] FAX: [phone]
e-mail: [e-mail]

For immediate technical or application assistance:

U.S.A. and Sales Service: 1-800-826-6342 / 1-800-TC-OMEGA

®

Canada: Customer Service: 1-800-622-2378 / 1-800-622-BEST

®

Engineering Service: 1-800-872-9436 / 1-800-USA-WHEN

®

Mexico: En Espan˜ol: [phone]-7803 e-mail:[e-mail]

FAX: [phone] [e-mail]

OMEGAnet®Online Service Internet e-mail

omega.com [e-mail]

Servicing Europe:

Benelux: Postbus 8034, 1180 LA Amstelveen, The Netherlands

Tel: [phone] FAX: [phone]
Toll Free in Benelux: 0800 0993344
e-mail: [e-mail]

Czech Frystatska 184, 733 01 Karviná, Czech Republic
Republic: Tel: [phone] FAX: [phone]

Toll Free: 0800-1-66342 e-mail: [e-mail]

France: 11, rue Jacques Cartier, 78280 Guyancourt, France

Tel: [phone] FAX: [phone]
Toll Free in France: 0800 466 342
e-mail: [e-mail]

Germany/ Daimlerstrasse 26, D-75392 Deckenpfronn, Germany

Austria: Tel: [phone] FAX: [phone]

Toll Free in Germany: 0800 639 7678
e-mail: [e-mail]

United One Omega Drive, River Bend Technology Centre
Kingdom: Northbank, Irlam, Manchester

ISO 9002 Certified M44 5BD United Kingdom

Tel: [phone] FAX: [phone]
Toll Free in United Kingdom: 0800-488-488
e-mail: [e-mail]