These position sensors can tolerate temperature spikes
This company offers several linear variable differential transformers (LVDTs) with an extended 400°F temperature range for use in applications where temperature spikes are possible. The transducers ensure reliable position measurement in applications with fluctuating temperatures where standard-temperature sensors can fail due to deteriorating insulation and intermittent connections. For example, standard temperature position sensors used on steam valves may unexpectedly fail when the valve is in motion due to temperature spikes caused by steam leaks. Failures also can result from hot-gas outbursts or temporary exposure to opened furnace doors. Replacing these standard units with a higher temperature LVDT stops failures, eliminates bad readouts and reduces downtime associated with maintenance. — NewTek Sensor Solutions, Pennsauken, N.J.