LWK-06-W250B-350 Micro-Measurements (Division of Vishay Precision Group), LWK-06-W250B-350 Datasheet

LWK-06-W250B-350

Manufacturer Part Number

LWK-06-W250B-350

Description

STRAIN GAGE 350 OHM LINEAR WELD

Manufacturer

Micro-Measurements (Division of Vishay Precision Group)

Series

LWKr

Datasheet

1.LWK-06-W250B-350.pdf (3 pages)

Specifications of LWK-06-W250B-350

Strain Range

±5%

Resistance (ohms)

350

Resistance Tolerance

±0.4%

Pattern Type

Linear Weldable

Length - Active

0.250" (6.35mm)

Length - Overall Pattern

0.620" (15.70mm)

Length - Overall

0.88" (22.4mm)

Width - Active

0.125" (3.18mm)

Width - Overall Pattern

0.170" (4.30mm)

Width - Overall

0.32" (8.1mm)

Operating Temperature

-320 ~ 500°F (-195 ~ 260°C)

Lead Free Status / RoHS Status

Contains lead / RoHS non-compliant

Other names

1033-1017
F003366

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Standard Weldable Patterns

www.micro-measurements.com

118

Micro-Measurements Standard Weldable Strain Gages and

Temperature Sensors are specially designed for spot

welding to structures and components. They are ideal for

applications where test or environmental conditions preclude

clamping and curing an adhesively bonded gage installation.

These gages are equally advantageous when strain

measurements must be made at an elevated temperature,

but the nature of the test object does not permit the use of an

elevated-temperature-curing adhesive.

Surface preparation requirements are minimal; only an

appropriate solvent cleaning and abrasion of the test part

surface with silicon-carbide paper or a small, hand-held

grinder is needed. Spot welding is accomplished with a

portable stored-energy hand-probe spot welder, such as the

Model 700. Environmental protection is as easily applied to a

welded gage installation as to an adhesively bonded gage.

Refer to Instruction Bulletin B-131 and Catalog A-110 for

further information on installation and protective coatings,

and to Bulletin 302 for specifications on the Model 700

Welding/Soldering Unit.

DESCRIPTION AND PERFORMANCE

General — All sensors are laboratory-prebonded, with a

high-performance adhesive, to thin (0.005 in [0.13 mm])

metal carriers. Sensor grids are fully encapsulated for

protection against handling and installation damage.

Standard weldable strain gages are offered in two series to

meet differing performance requirements. Both series are

available in either 06 or 09 self-temperature compensation.

Strain gages with 06 S-T-C have Inconel carriers, while

S-T-C 09 gages and temperature sensors are mounted on

300-series stainless steel.

CEA-Series Weldable Strain Gage

encapsulated constantan foil grid, with large, rugged,

copper-coated tabs. In most cases, the carrier can be

contoured to a radius as small as 1/2in [13mm]. The CEA

It is important to note that operating characteristics of

weldable strain gages (gage factor, transverse sensitivity,

and thermal output) are specified for the basic strain gage

itself — without the metal carrier. Thus, the properties are

measured by bonding a conventional strain gage directly

to an appropriate calibration specimen, following standard

methods specified for all Micro-Measurements strain

gages. This procedure assures the most accurate results,

independent of the variables introduced by welding. In

particular, the user should be aware that the gage factor

specified on the engineering data sheet accompanying

the gage applies only to the basic strain gage, without the

shim. The effective gage factor of the weldable assembly

(after welding to the test member) is commonly 5 to 10%

Micro-Measurements

Special Use Sensors - Weldable Strain Gages

For technical questions, contact:

MEASUREMENT CONSIDERATIONS

—

Polyimide-

micro-measurements@vishaypg.com

Series is ideal for direct leadwire attachment, before or after

installation.

Strain range is ±5000µin/in [±5000µm/m], and normal

operating temperature range is –100° to +200°F [–75° to

+95°C]. Short-term maximum temperature is +300°F

[+150°C].

LWK-Series Weldable Strain Gage — Nickel-chromium

alloy grid, encapsulated in fiberglass-reinforced epoxy

phenolic. The LWK gage is provided with a three-wire lead

system with 10 in [250 mm] of Teflon

This

compensation and provides for easy connection of the lead

system to the instrumentation cable. Minimum installation

radius is generally limited to 2in [50 mm].

Strain range is ±5000µin/in [±5000µm/m], and normal

operating temperature range is –320° to +500°F [–195° to

+260°C]. Short-term maximum temperature is +550°F

[+290°C].

WWT-Series Temperature Sensor — High-purity nickel foil

grid encapsulated in fiberglass-reinforced epoxy-phenolic,

and equipped with integral three-tab terminal to facilitate

leadwire attachment. The temperature sensor is normally

installed on a flat surface of the workpiece, but, in any case,

should always be oriented with the gridlines in the direction

of minimum strain to avoid strain-induced errors (see

Micro-Measurements

Resistance Temperature Sensors and Associated Circuitry).

With an appropriate LST Matching Network, the temperature

response characteristic of the nickel can be linearized and

scaled for direct readout (in degrees) with any strain

indicator.

Teflon is a Registered Trademark of DuPont.

lower than this, due primarily to the stiffness of the shim.

The reduction in gage factor is not subject to quantitative

generalization, because it depends on the cross-sectional

properties of the test specimen, and on the mode of

loading (e.g., bending versus direct stress). It has been

demonstrated, however, that for a group of like

specimens, loaded in the same manner, the weldable

gages exhibit very good repeatability and uniformity of

response. Therefore, when test requirements dictate

greatest accuracy, the weldable gages should be

calibrated on a specimen of the same material and cross

section as the test part, and under the same mode of

construction

simplifies

Tech

Note

leadwire

Document Number: 11519

-insulated leadwire.

TN-506,

Revision: 02-Feb-10

temperature

Bondable

Related parts for LWK-06-W250B-350

LWK-06-W250B-350 Summary of contents

Page 1

... Short-term maximum temperature is +300°F [+150°C]. LWK-Series Weldable Strain Gage — Nickel-chromium alloy grid, encapsulated in fiberglass-reinforced epoxy phenolic. The LWK gage is provided with a three-wire lead system with 10 in [250 mm] of Teflon This construction compensation and provides for easy connection of the lead system to the instrumentation cable ...

Page 2

... AND DESIGNATION Insert Desired S-T-C No. in Spaces Marked XX. See Note 1 CEA-XX-W250A-120 CEA-XX-W250A-350 CEA-XX-W250C-120 CEA-XX-W250C-350 LWK-XX-W250B-350 LWK-XX-W250D-350 WWT-TG-W200B-050 Note 1: Products with designations and options shown in bold are not RoHS compliant. Document Number: 11519 For technical questions, contact: Revision: 02-Feb-10 Standard Weldable Patterns Micro-Measurements RES ...

Page 3

All product specifications and data are subject to change without notice. Vishay Precision Group, Inc., its affiliates, agents, and employees, and all persons acting on its or their behalf (collectively, “Vishay Precision Group”), disclaim any and all liability for any ...

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