The TP4/7 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 invloving any additional wiring, conduit modifications or other expensive extras.
Specifically designed for Multivariable Transmitters and Level Transmitters
Four wires protected, one pair at 12V to 24V and one pair at 7V (e.g. RS485)
Easy and direct mounting - simply screws into spare conduit entry
Intrinsically safe and flameproof to CENELEC standards