High-Temperature Weldable Strain Gages Vishay Micro-Measurements 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 1800F (980C). While designed primarily for dynamic measurement applications, the active dummy method of temperature compensation can be used when static strain measurements are made. GAGES WITH M-SERIES LEADWIRES GAGES WITH F-SERIES LEADWIRES 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. FREE FILAMENT BONDED STRAIN GAGE INCONEL SHEATHED MgO WELDABLE STRAIN GAGE WELDABLE TERMINAL SW SL CABLE L 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, twoconductor cable with an Inconel metal jacket is rated to 1800F (980C) 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. Document Number: 11530 Revision 13-Feb-03 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 fiberglassinsulated braided, two-conductor cable assembly is attached at the gage end through alumina insulators strapwelded 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 1200F (650C) and is used where fraying due to vibration is not a concern. F-Series cables are more flexible than M-Series cables. micro-measurements@vishay.com www.vishaymg.com 1 High-Temperature Weldable Strain Gages Vishay Micro-Measurements Special Purpose Strain Gages - High-Temperature Weldable Strain Gages DESIGNATION NOMINAL NOMINAL RESISTANCE GAGE IN OHMS FACTOR SENSOR ALLOY SENSOR GAGE MAXIMUM LENGTH TEMP. IN DEG.F LEADWIRE SHIM LENGTH SHIM WIDTH LEAD S.L. (IN) S.W. (IN.) TERMINAL LZN-NC-W250G-120/2F 120 2.0 NiChrome V 1/4" 1200 F ChromelAlumel 0.50 0.30 Yes LZN-NC-W250G-120/2M 120 2.0 NiChrome V 1/4" 1600 F ChromelAlumel 0.50 0.30 None LZE-NC-W250G-120/2F 120 4.0 Pt8W 1/4" 1200 F ChromelAlumel 0.50 0.30 Yes LZE-NC-W250G-120/2M 120 4.0 Pt8W 1/4" 1800 F ChromelAlumel 0.50 0.30 None www.vishaymg.com 2 micro-measurements@vishay.com Document Number: 11530 Revision 13-Feb-03