TW12.8HRMS800 wheel torque transducer 1 085 N·m

TW12.8HRMS800: high-resolution wheel torque transducer, 1,085 N·m

The TW12.8HRMS800 is a high-resolution wheel torque transducer that gives one channel of torque data. Its four-arm strain gage bridge measures up to 1,085 N·m (800 lbf·ft) and resolves 0.2 lbf·ft (0.27 N·m); a mechanical stop protects it to 8.1 kN·m (6,000 lbf·ft) for use in normal driving. It carries a static weight of 1,000 kg. The stainless steel ring, Ø 340.18 × 25.65 mm, is sealed to IP67 and adapts to 14 in and larger wheels. Non-linearity is 0.1 % of full scale or less and hysteresis 0.05 %, at up to 10 V excitation, DC or AC rms; it operates from −40 to 125 °C.

The hub adapter, common to all TW12.8 models, bolts to the inner circle of eighteen holes and the rim adapter to the outer circle, with custom M10 × 1.5 screws tightened crosswise to 81 N·m; the wheel is balanced with its tire. The amplifier, matched to the transducer, carries a 10-circuit slip ring with a 512-pulse encoder and mounts on collet extensions over the lug nuts; a restraint rod to a magnetic bracket on the fender holds the stator. The TW2 electronics, powered at 9 to 36 V DC, zero the transducer and check its shunt calibration.

It is used on passenger cars, SUVs and light-duty trucks for on-road measurement of the chassis system losses that influence fuel economy, and for fuel regulation testing.