SGT-Full-Bridge-Diaphragm

Supported Applications

The Omega SGT Full Bridge Diaphragm series provides transducer quality strain gauges designed for bending or axial tension/compression applications. These full Wheatstone bridge configurations feature perpendicular grids optimized for single surface gaging.

Suitable for use with stainless steel or aluminum spring elements, the series offers temperature compensation options specifically matched to these materials: ST (Steel) and AL (Aluminum).

Operating Conditions & Performance

The SGT series is engineered as a full bridge configuration on a single carrier, providing pre-aligned strain gauges intended for easy installation. This design reduces wiring complexity compared to individual element placement.

Performance parameters are defined by the specific model selection:

• Nominal Resistance: Available in 350 Ω or 1000 Ω configurations depending on the grid pattern and series variant.
• Maximum Bridge Energizing Voltage (Vrms): Varies by model, ranging from 6.5 Vrms to 33 Vrms as specified in the selection table for each gage size and resistance combination.

Configuration Options

The series is configurable across grid sizes, termination types, temperature compensation materials, and nominal resistances. The model number follows the pattern SGT-<GRID SIZE>/<RESISTANCE>-<TERMINATION>-<TEMP COMP>.

Grid Sizes and Dimensions

The series supports three primary grid patterns with corresponding carrier dimensions:

• SGT-2 Series (10 mm actual size): Grid A 1.8 mm, Grid B 2.0–2.4 mm; Carrier C 10 mm.
• SGT-3G Series (10.5 mm actual size): Grid A 2.5 mm, Grid B 2.9 mm; Carrier C 10.5 mm.
• SGT-4 Series (14.8 mm actual size): Grid A 4.0 mm, Grid B 4.3 mm; Carrier C 14.8 mm.

Termination and Electrical Connection

Selectable electrical connection methods include:

• Ribbon Leads: Standard termination for models ending in FB1x or FB2x (e.g., SGT-2/1000-FB11).
• Solder Pads: Available on models ending in FB4x (e.g., SGT-2/1000-FB41) for direct soldering.

Packaging and Special Features

All variants are supplied as a package of 5. The SGT-3G/350 series models feature an open corner at the signal terminals with five total terminals, allowing for the addition of zero temperature compensation and zero balance compensation resistors. All other full bridge gauges in this series utilize four terminals.

Key Product Differences

Variants within the SGT Full Bridge Diaphragm series are distinguished by grid size (SGT-2, SGT-3G, or SGT-4), nominal resistance (350 Ω vs. 1000 Ω), termination style (Ribbon Leads vs. Solder Pads), and temperature compensation material (ST for Steel, AL for Aluminum).

Maximum permitted bridge energizing voltage differs by model; for example, the SGT-2/350 series supports up to 6.5 Vrms or 9 Vrms depending on termination and compensation code, while larger grid sizes such as the SGT-4/1000 support higher voltages up to 23 Vrms (Ribbon Leads) or 33 Vrms (Solder Pads).