WT* series for high-temperature

Key features

Weldable high temperature strain gages are dedicated for measurements of deformations in the details of machinery and equipment under dynamic and static loads in ‑269…+900°C temperature range.

Weldable strain gauges could be produced as single-copmonent strain gauge, or as a half-bridge assembly (active + dummy gage). Could be completed to the full-bridge with BCM.

These gages are intended for installation in places where bonding with ceramic cements is not possible either due to complication in surface preparation (polishing, degreasing, etc.) or due to large dimensions of the test object (cannot be thermally treated for cement curing).

Construction-wise a WT* series strain gage is a ST* series wire strain gage, installed on a small piece of thin metal foil with ceramic cement and protected with organosilicon varnish.

Backing material is an oxidation and corrosive resistant superalloy. This material is selected to match the thermal expansion coefficient of the sensitive grid.

Sensitive grid is installed on the backing with flame-sprayed ceramic, applicable for long-term operation at 900°C. Ceramic also acts as an insulating layer between backing and the grid.

Lead wires are made in a 2-core chromel/alumel cable in silica braid sheath. Typical diameter of the cores is 0.3 mm, but can be changed on demand. Typical length of the lead wires is 100 mm.