micro-measurements@vishay.com
High-Temperature Weldable Strain Gages
Vishay Micro-Measurements
Document Number: 11530
Revision 13-Feb-03 www.vishaymg.com
1
Special Purpose Strain Gages - High-Temperature
Weldable Strain Gages
FEATURES
• High temperature installations using simple attachment techniques
• Ceramic bonded wire gage performance in a weldable gage
• Superior performance of bonded gages
• Improved fatigue life for dynamic applications
Vishay Micro-Measurements high-temperature weldable
strain gages are free-filament wire strain gages pre-bonded
to shim stock using flame sprayed alumina. The gages can
be welded to the test structure using a capacitive discharge
spot welder (such as Vishay Micro-Measurements Model
700), permitting easy installation in the field, especially on
large structures. High-temperature weldable strain gages
are excellent in applications where protection against
moisture is not required. The fatigue resistance of this
bonded wire strain gage makes it the best choice for
dynamic, impact or vibratory strain measurements to
1800°F (980°C). While designed primarily for dynamic
measurement applications, the active dummy method of
temperature compensation can be used when static strain
measurements are made.
High-temperature weldable strain gages are available with
grids of Nichrome V or Pt8W alloys. They can be ordered
with either of two types of preattached high-temperature
insulated cable.
GAGES WITH M-SERIES LEADWIRES
Complete assembly consists of a free-filament gage
bonded to a shim, a weldable transition terminal and a high
temperature cable with chromel/alumel wire. A fiberglass-
insulated braided, two-conductor cable assembly is
attached at the gage end through alumina insulators strap-
welded to the terminal shim, providing a firm anchor for the
cable at the gage end. The cable conductors are threaded
through lengthwise holes in the alumina insulators and
bonded to the insulators with high strength ceramic cement
to prevent wire movement at the gage - cable weld junction.
The fiberglass cable is rated to 1200°F (650°C) and is used
where fraying due to vibration is not a concern. F-Series
cables are more flexible than M-Series cables.
GAGES WITH F-SERIES LEADWIRES
WELDABLE
STRAIN GAGE
CABLE
WELDABLE
TERMINAL
Complete assembly consists of a free-filament gage
bonded to a shim with an integral high-temperature cable
with chromel/alumel wires. The mineral insulated, two-
conductor cable with an Inconel metal jacket is rated to
1800°F (980°C) and offers excellent protective in harsh
environments. While the ends are sealed to avoid moisture
absorption during shipping or storage, care should be
taken when using M-Series cables to ensure that the
mineral insulation does not absorb moisture during
handling and application.
FREE FILAMENT
BONDED STRAIN GAGE
SL L
SW
INCONEL SHEATHED MgO
micro-measurements@vishay.com
High-Temperature Weldable Strain Gages
Vishay Micro-Measurements
Document Number: 11530
Revision 13-Feb-03
www.vishaymg.com
2
Special Purpose Strain Gages - High-Temperature
Weldable Strain Gages
DESIGNATION NOMINAL NOMINAL SENSOR ALLOY SENSOR GAGE MAXIMUM LEADWIRE SHIM LENGTH SHIM WIDTH LEAD
RESISTANCE GAGE LENGTH TEMP. IN S.L. (IN) S.W. (IN.) TERMINAL
IN OHMS FACTOR DEG.F
LZN-NC-W250G-120/2F 120 2.0 NiChrome V 1/4" 1200 °F Chromel- 0.50 0.30 Yes
Alumel
LZN-NC-W250G-120/2M 120 2.0 NiChrome V 1/4" 1600 °F Chromel- 0.50 0.30 None
Alumel
LZE-NC-W250G-120/2F 120 4.0 Pt8W 1/4" 1200 °F Chromel- 0.50 0.30 Yes
Alumel
LZE-NC-W250G-120/2M 120 4.0 Pt8W 1/4" 1800 °F Chromel- 0.50 0.30 None
Alumel
