Type of Electrodes
The E4 comes with two types of user replaceable 8mm diameter electrodes: stainless steel (SUS316L) and silver (Ag) plated. Please note that the Stainless steel electrodes are darker than the silver ones.
Stainless steel (top - darker in color) and silver (bottom - whiter in color) electrodes
Extensive testing has demonstrated that the stainless steel electrodes are performing as well as classic Ag electrodes when used with the E4. Stainless steel electrodes should last for the life of the device. The silver electrodes should last for months under continuous use but will oxidize, picking up a grey tarnish over time.
The EDA electrodes should not be replaced frequently as screwing and unscrewing repeatedly may degrade the performance of the sensor. Reserve electrode replacement for end-of-life replacement of silver electrodes or for electrode comparison studies. It is not necessary to change electrodes between Patients/Users. The disinfection process can be done when the electrodes are attached to the E4.
The E4 electrodes can be changed by hand, just rotate them counterclockwise to loosen and clockwise to tighten. Make sure the electrodes are tightened securely after replacement to ensure maximum data quality. Secure the electrodes by hand, not using a tool, to avoid damaging the mechanical connection to the E4 band.
If you are observing issues with the EDA values hovering around 0.0 µS with occasional spikes it may be a sign of improper electrode placement and a lose connection.