Surge Arrester

What kind of transmitter? RF, hardwired, bit rate, signal frequency.

Ya think the signal edge has been affected? How? Did you use any test equipment to measure the effects. Can you show a schematic diagram of the transmitter, and receiver circuits. What type of surge arrester, silicon, RTV. What is the source and sink impedance of the circuit?

I'm not too clairvoyant at this moment in time to guess what your system is.

If it does, then don't install it.

Sheesh.

A surge protector designed for loop powered 4-20mA field transmitters typically consists of a gas-filled discharge tube capable of diverting up to 20kA impulses via high-power solid-state electronics.

They do not affect normal operation. They pass dc or modulated dc signals without attenuation. There are even models for use with Foundation Fieldbus, a digital protocol. They divert surge currents safely to earth and clamp output voltage to a defined level.

They wire across the plus, minus and ground terminals of the transmitter.

The transmitter is assumed to be bonded to earth ground.

Why do you presume yours to be a problem?

It depends on the surge arrester (some will, some wont), there are many different types using many different technologies and protecting against specific things (from small disturbances right up to lightning strikes).

Be aware there is NO perfect single solution which will provide complete equipment protection. If you have a look at the data sheets and application notes for the surge arrester you plan on using it will tell you if it will effect your signal.

What exactly are you after and what are you trying to protect against?

_{Jack - Used to sell them.}

Why in series?

What is the issue: lightning RTCA/DO-160 ? ?

Surge....Spikes ?- Mil Std 1275 E? TBD

Maximum Energy how many Joules?

What devices you use to protect with?

More details are needed about transmitter etc......as AI use to say 95% of the time is to defined the problem !