English unit kit with retroreflective targets
Invar tubing is great for metrology because it has such a very low coefficient of thermal expansion, which effectively eliminates changes in length due to handling or environmental changes.
The Invar tubing in the 803-CP is manufactured to its stated length within ±0.0001". In addition, the Invar tubing components are hand-picked for each kit so that the total stackup error does not exceed 0.0005". This means that you can connect all of the tubes found in a given kit together end-to-end, and the stack will maintain the total length within the stackup error. (The table above right summarizes this information.) We often recommend the 803-CP when people ask for a calibration or scaling-quality type system.
Individual components may be assembled to produce lengths from 9" to 114", in 5" increments. The table below specifies all included components.
803-CP Invar Kit Components
|A||12587-20IN||20" Invar tube||4|
|12587-10IN||10" Invar tube||2|
|12587-5IN||5" Invar tube||2|
|B||15483-1||Retroreflective target; 1/4" dot, 1" offset||4|
|C||15484-1||Target holder; 1" offset||4|
|D||12406-G1||Stainless steel connectors||10|
|n.a.||n.a.||NIST traceable certification for kit||yes|
|Case||Plastic case with foam insert|
|Finish||Oil and stain resistant PVC jacket, red|
|Invar Tubing||1" diameter Invar with stainless steel end caps, having 3/8"-24 internal threads on each end|
|Thermal Expansion Coefficient||0.70x10−6 in./in./°F for temperature range of 0°F to 200°F|
|Weight, Product & Case (Approx.) lb||17|
|Weight, Product & Case (Approx.) kg||7.7|
|Weight, Shipping (Approx.) lb||22|
|Weight, Shipping (Approx.) kg||10|