SGN-SpanResistors

Supported Applications

The Omega SGN Span Resistors series provides temperature compensation for strain gage bridges. These resistors are designed to compensate for temperature-induced resistance changes in strain gage circuits. The product line includes span temperature-compensation resistors, as well as bridge-balancing and zero temperature-compensation resistors.

Operating Conditions & Performance

The series offers distinct performance envelopes based on the foil material and construction type:

• Nickel Foil (SGN-E, SGN-PN): Features a temperature coefficient of resistance of 0.6%/°C (0.34%/°F) with an operating range of 0 to 100°C (32 to 212°F).
• Nickel Foil Zero Compensation (RES-N): Operates within the same 0 to 100°C (32 to 212°F) range with a temperature coefficient of resistance of 0.6%/°C (0.34%/°F).
• Constantan Foil Zero Compensation (RES-C): Designed for an extended operating range of -75 to 200°C (-100 to 392°F). The temperature coefficient is not specified in the source data.

All models utilize a polyimide carrier with a substrate thickness of 20 microns. Encapsulated and open-face span resistors feature a foil measuring grid that is 5 microns thick, while zero compensation resistors also use a 5-micron-thick foil (Constantan or Nickel). The resistance tolerance for all listed models is ±1 Ω.

Configuration Options

The series supports multiple configurations to address specific circuit requirements:

• Sensor Types: Available as encapsulated span temperature-compensation resistors (SGN-E), open-face span temperature-compensation resistors (SGN-PN), and bridge-balancing/zero temperature-compensation resistors (RES-C, RES-N).
• Nominal Resistance Values: Span resistors are offered in nominal resistance values including 10 Ω, 12 Ω, 14 Ω, 16 Ω, 20 Ω, 24 Ω, 25 Ω, 28 Ω, 30 Ω, 32 Ω, 34 Ω, 36 Ω, 48 Ω, and 60 Ω. Zero compensation resistors are available in 2 Ω and 5 Ω.
• Model Numbering: The series follows the convention SGN---, such as SGN-2/20-E or SGN-4/28-PN. Zero compensation models follow patterns like RES-2C and RES-5N.
• Physical Dimensions: Grid dimensions (Active gage length A, Active gage width B) and carrier matrix dimensions (Matrix length C, Matrix width D) vary by series number (SGN-2, SGN-3, SGN-4). For example, the SGN-2 series has a grid of 1.9 mm x 3 mm, while the SGN-4 series features a 4 mm x 3.2 mm grid.

Key Product Differences

The primary distinction within the span resistor family is between encapsulated (E) and open-face (PN) constructions. Both types utilize Nickel foil measuring grids on polyimide carriers but differ in their physical protection profile. The zero temperature-compensation resistors are differentiated by material: RES-C models use Constantan foil for a wider operating range (-75 to 200°C), whereas RES-N models use Nickel foil (0 to 100°C). Dimensional variations correspond directly to the series number in the model code, with SGN-2, SGN-3, and SGN-4 indicating specific grid and carrier sizes.