The Crouse-Hinds series MTL TP24/7 surge protection device is a unique unit providing surge protection for 12-24V power connection and RS485 or Profibus-DP signal for a 4-wire process transmitter. The level of protection for field-mounted transmitters 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 1/2” NPT, 20mm ISO, and G1/2” (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.
For Functional Safety applications TP24/7 surge protection devices can be considered as wiring components that pass the process signals without alteration. Information is provided in the Functional Safety manual to assist in the selection and application of MTL surge protection devices for instrumentation signals that are being used to provide functional safety according to the latest IEC 61508 and IEC 61511 standards.
IEC:
NEC/CEC (FM):
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