New thermal EMF relays reduce thermocoupling

Officials of Coto Technology in Providence, R.I., are offering their 3500- and 3600-series low-thermal EMF Reed relays, which they say reduce thermocoupling and provide for accurate voltage measurements at low signal levels. With these devices, Coto experts seek to help systems designers address the problem of how stray voltages introduce errors into the signal path when measuring low-level signals in the range of tens to hundreds of microvolts. Typically, as temperature increases, thermocouples generate stray voltages in the circuit, which result from the dissimilar materials of a relay. Coto`s relays have thermal chips that provide thermal equilibrium while maintaining electrical isolation. Coto relays are available with maximum thermal EMF ratings between 5 and 10 microvolts. For more information, contact Coto`s Gene Carter by phone at 401-943-2686, by fax at 401-942-0920, or on the World Wide Web at http://www.cotorelay.com/ - J.K.