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Coiling of the thermostatic bimetal achieves greater “active length” within a small space, thus maximizing the possible displacement. One end of the spiral /helical coil is permanently fixed .the loose end describes a rotary path in response to a change in temperature.
The choice between a spiral or a helical coil depends on the intended application.
Spirals are preferred for measuring ambient temperatures (room temperature, sauna thermometer).
Thermostatic bimetals have been standardized in a number of countries. The relevant standards usually contain data on materials, their properties, dimensions, shapes and tolerances, as well as test specification and, in some cases, references to other general test standards. Major standards are listed below:
Germany:
DIN1715 part 1 ,
thermostat metals ; Technical delivery conditions.
DIN1715 part 12,
thermostat metals ; Testing the specific thermal curvature.
SEW 385
Eisenlegierungen mit besonderer wärmeausdehnung
USA:
ASTM B 388
Standard specification for Thermostat Metal Sheet and Strip.
ASTM B 753
Standard specification for Thermostat Component Alloys.
ASTM B 106
Test Method for Flexivity of Thermostat Metals.
Japan:
JIS C 2530
Thermostat Metals for electric apparatus .
Russia:
GOST 10533
Cold-rolled thermostatic bimetallic strip. Specifications
GOST 10994
Precision alloys. Grades
China
GB/T 4461
Thermostatic bimetal strips
Dear sirs, if you not sure which kind of bi metal spiral is suitable for you , please feel free to contact me . Our R&D department can produce coils according to your drawing ,sample or specific demands .
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