The Crouse-Hinds series MTL TP24/7 surge protection device is a unique unit providing a level of protection for field-mounted transmitters that is far in excess of the optional transient protection facilities available from the transmitter manufacturers - without involving any additional wiring, conduit modifications or other expensive extras.
The TP24/7 protection network consists of high-power, solid-state electronics and a gas-filled discharge tube capable of diverting 10kA impulses. The whole unit is encased in a 316 stainless steel housing, threaded for the common conduit entries used on process transmitters. Versions are available for 1/2Ó NPT, 20mm ISO, and G1/2Ó (BSP 1/2 inch) threaded entries.
For hazardous area use, approvals for both intrinsically safe and flameproof (explosion-proof) operation are available, in all gas groups and apparatus temperature classifications up to T4.