Series Availability
N2A , N2P

General Description
This option provides conformable, soft copper lead ribbons and a 0.0005-in (0.013-mm) thick encapsulation layer of polyimide film. The encapsulation layer provides excellent protection for the gage during handling and installation. It also contributes greatly to environmental protection, though supplementary coatings are still recommended for field use. Gages with Option SP61 will normally show better long-term stability than open-faced gages which are "water-proofed" only after installation. a good part of the reason for this is that the encapsulation layer prevents contamination of the grid surface from fingerprints or other agents during handling and installation. The presence of such contaminants will cause some loss in gage stability, even though the gage is subsequently coated with protective compounds.

Leads
0.010 wide x 0.002 in thick (0.25 x 0.05 mm) soft copper ribbons. Leads are approximately 0.8 in (20 mm) long.

Solder
+430 deg F (+220 deg C) tin-silver alloy; The solder is confined to small, well-defined areas at the end of each ribbon.

Temperature Limit
+400 deg F (+200 deg C)

Grid Protection
Entire gage is encapsulated. a shore extension of the backing is left uncovered at the leadwire end to prevent contact between the leadwires and the specimen surface.

Size
Matrix size is unchanged.

Strain Range
Strain range will usually be reduced by the addition of Option SP61.

Flexibility
Gages with Option SP61 are not as conformable as standard gages.

Resistance Tolerance
Resistance tolerance is normally doubled by the addition of Option SP61

Reference Table