Free-filament wire strain gages and ceramic cements for extreme temperatures
The new free-filament wire strain gages allow for high-reliability measurements of both dynamic and limited-static strain, at much higher temperatures than have been traditionally possible with conventional bonded strain gage designs. The gages, offered as the ZWH-, ZWN-, and ZWP-Series, can accurately measure dynamic strain values in temperatures up to +1038°C, as well as limited-static strain to +816°C. They offer excellent oxidation resistance, along with improved bond strength, as compared to traditional free-filament foil gage designs.
Each series offers unique application advantages, depending upon specified parameters. In applications where a compensating grid is used to achieve limited static strain measurements, for example, the iron-chrome-aluminium alloy ZWH-Series is recommended. In applications where optimal fatigue life is desired, the Nichrome-V alloy ZWN-Series is typically specified. And finally, where requirements call for a combination of highest possible oxidation resistance and highest temperature measurement capabilities, the platinum-tungsten alloy ZWP-Series is recommended.
All three series of gages are RoHS compliant and feature a free-filament wire construction, along with a series of integrated, welded 0.076mm diameter lead wires. A high-fatigue wire (Option Z) is available upon request. The gages offer 120-ohm resistance and are packaged with a fiberglass reinforced segmented tape carrier, which holds the grid and lead patterns intact during installation. They are bonded using either ceramic cement or Roxide flame spray. Among the new Micro-Measurements high-temperature ceramic cement offerings are the WC-16, NCC-3, and HG-1. The WC-16 ceramic cement offers best compatibility with new ZWP-Series free-filament wire gages, while the NCC-3 offers an environmentally friendly and RoHS compliant alternative to ceramic cements containing hexavalent chrome. The HG-1 ceramic cement offers high-performance bonding with steel and superalloys.
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