Three alternative tip configurations are usually offered:
An exposed (measuring) junction is recommended for themeasurement of flowing or static non-corrosive gas temperature whenthe greatest sensitivity and quickest response is required.
An insulated junction is more suitable for corrosive media althoughthe thermal response is slower. In some applications where more thanone thermocouple connects to the associated instrumentation,insulation may be essential to avoid spurious signals occurring in themeasuring circuits. If not specified, this is the standard.
An earthed (grounded) junction is also suitable for corrosive mediaand for high pressure applications. It provides faster response thanthe insulated junction and protection not offered by the exposedjunction.