EFP-06
Manufacturers Data Sheet
Information about usage and storage replacing the electrodes
2024: a new version of the EFP-06 is available.
Specifications 2024
Surface of the bottom: 27 cm^2
Weight: about 0.5 kg
Diameter (D): 64 mm
Height (H): 90 mm
Self (DC) potential of a couple: a few mV (shortly after manufacture)
Contact+internal resistance of a couple: 100-300 Ohm (shortly after manufacture, on normal ground)
HS Code 90159000
Note
The EFP-06 the alters after manufacture. Buy them when you need them.
The average lifetime is about 2 years.
Disposal: The EFP-06 is a hazardous waste. Dispose where you dispose car batteries or other material containing lead.
Deposit: put 2 mm water on the bottom of the EFP-06 and store it in the plastic bag. So humid, but not wet. Keep the cable end outside.
Steel Rods
Steel rods can be used for short recordings around 1-2 hours.
The deliver data good down to 10 Hz. Maybe more.
In dry areas you notify that by hammering the rods into the ground, the hole widens and the rod looses contact to the ground - and your measurment is useless!
Use the EFP-06. Use bentonite in case of dry ground. Never use salt! That destroys the chemistry of the electrodes (despite many people say “use salt” … don’t use salt!).
Hence that above 100 Hz you’ll see some data - but that is data from the E-filed line and not from the electrodes.
In case you get 100 mV offset: check the electrodes. replace electrodes