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HPI waterproof rosette strain gages are designed with three active elements generally configured at 45° angles, but can be designed to customer specifications. In this configuration, three linearly independent strain measures are used to determine the three independent components of plane strain.

Our waterproof gages are specifically designed to evaluate and monitor live-load stresses for railroad, bridge, and other structural applications and are 100% full water immersion tested. Strain gage resistances offered are 120Ohms and 350ohms nominal.

The precision foil gage is bonded to a stainless steel shim, pre-wired and protected with a molded water-proofing material. The stainless steel shim permits easy field installation with any conventional capacitive discharge spot welder.

Instrumentation cable and wiring options can be customized to your specifications. Custom gage sizes and resistance are also available. Please see the table below for options.

Temperature Range: -50°F — 180°F (-45.5°C — 82°C)
Gage Factor (nominal): 2.0

Part Number

Gage Length

Lead Wire

Shim Length

Shim Width

HBWR-35-125-6-VR
Data Sheet (80-824)

.125″

Vinyl

1.06″

1.06″

HBWR-35-125-6-GP-TR(SS)
Data Sheet (80-823)

.125″

Shielded Vinyl

1.06″

1.06″

HBWR-35-125-6-UP-9 WIRE
Data Sheet (80-810)

.125″

Shielded Polyurethane

1.06″

1.06″

HBWR-35-125-6-UP-HB-TR(SS)
Data Sheet (80-836)

.125″

Shielded Polyurethane

1.06″

1.06″

HBWR-35-125-6-GP-TR-SS-FB
Data Sheet (80-834)

.125″

Shielded Vinyl

1.06″

1.06″

Standard gage configurations can be customized for individual applications
Choose options from the table below for waterproof strain gages

Gage Resistance

12: 120 Ohms
35: 350 Ohms

Gage Length

125: 1/8″ active grid

Temp. Compensation

6: 6 ppm/°F

Pre-Curved Shims

Hoop (Circumferential)
Axial (Longitudinal)

Custom Wiring Options

SS: Stainless steel hypo-tube stress relief between sensor and cable transition
TR: Teflon ribbon stress relief between sensor and cable transition
NT: Sensors with cable integral to sensor shim (no transition)
FB: Full bridge
HB: Half bridge
AMP: Amplified full bridge, gain of X 100 standard (wiring datasheets 80-821 and 80-822)

Instrumentation Cable

GP: General purpose 3 or 4 conductor, shielded vinyl jacket (#22 AWG)
HP: 4 conductor, heavy duty shielded vinyl jacket (#22 AWG)
VR: 3 or 4 conductor, vinyl ribbon (#24 or #30 AWG)
TR: 3 or 4 conductor, teflon ribbon (#30 AWG)
UP: 4 conductor, polyurethane shielded jacket (#22 AWG)