Reference torque transducer helps companies achieve ISO 9000

Citation

(2003), "Reference torque transducer helps companies achieve ISO 9000", Aircraft Engineering and Aerospace Technology, Vol. 75 No. 3. https://doi.org/10.1108/aeat.2003.12775cad.006

Reference torque transducer helps companies achieve ISO 9000

Reference torque transducer helps companies achieve ISO 9000

It is reported that the new TB2 reference torque transducer from HBM has been designed to ensure traceability of measurements as part of the ISO 9000 certification. Any company aiming to receive certification to ISO 9000, or having already been certified, has to prove traceability to national standards. This requirement includes all equipment used for measurements and tests made for quality assurance of a company's products (Plates 4 and 5).

The measuring body of the TB2 has been designed with axially arranged U-sections to give increased accuracy, especially for the temperature effect on zero signal, the linearity deviation and the reproducibility. The models feature a very small uncertainty of measurement.

Plate 4 There are six models in HBM's TB2 reference torque transducer series with nominal (rated) torque values from 500 to 10 kNm

Plate 5 HBM's Spider8-30 has high stability and low noise sensitivity for experimental stress analysis

The relative standard deviation of repeatability is < ±0.01 per cent, the temperature effect on the zero signal is < ±0.02 per cent/10 K and the linearity deviation including hysteresis is < ±0.03 per cent. This means that the transducers are specified with an accuracy of 0.03 and typically achieve the best accuracy of 0.05 as specified by DIN 51309 or EA-10/14 already for initial values below 2 per cent.

The strain gauge measuring system is said to enable all types of SG full bridge amplifiers to be used. These amplifiers, especially the DMP 40 digital precision amplifier or the MGCp/l/s system's ML38 precision amplifier module, are used to integrate the transducers into the complete measuring chain provided by HBM. This means: "The complete one-stop solution, from transducer through signal conditioning and evaluation software." In addition, amplifiers enable easy linking to the different interfaces and fieldbus systems.

There are six models in the TB2 reference torque transducers series. These have nominal (rated) torque values of 500 Nm, 1 kNm, 2 kNm, 3 kNm, 5 kNm and 10 kNm.

HBM has also launched the Spider8-30 system with 600Hz carrier frequency technology to give high stability and low noise sensitivity for experimental stress analysis. Spider8-30 is the latest version of HBM's Spider8 universal digital multi-channel data acquisition system.

The basic system provides four measurement channels with 600Hz carrier frequency and 16 digital inputs/outputs. It is fitted with a parallel port for connection to a PC and a single RS232C interface to allow expansion of up to four additional SR30 600Hz modules or with SR01 DC voltage modules for active encoders, thermocouples and resistance thermometers.

The system has been designed for strain gauges using all types of Wheatstone bridge circuit. For connecting single strain gauges using three-wire technique, each channel has been fitted with three selectable completion resistors (120, 350, 700 ohms). A shunt resistor can be connected to create defined detuning to enable the sensitivity loss to be determined.

The Spider8-30 can be used with Spider8 models to build up a system with up to 64 channels by connecting the systems in cascade. The Spider8-30 is also available for mobile use as an 8 or 16 channel version called the Spider8-Mobil.

Details available from: HBM UK. Tel: 020 8515 6100; Fax: 020 8515 6149; E-mail: mike.johnson:@uk.hbm.com; Web site: www.hbm.com