In a data-logger I am designing right now the sensors will be placed some 3 meters away from the central unit. I'll have an RTD PT1000, a capacitive humidity sensor, a digital pressure sensor and two strain gauges.
I have two questions on this configuration, regarding two topics that I'm not very familiar in :
1) Do I need any clamping diodes at the connection point of the sensors to the PCB?
2) Any filtering before the amplification stage? I'm mostly concerned on EMI (both inductive and conductive). Are filters really necessary? For example the NFM21C or the BLM series of Murata.
Nick