The record plates are reusable by replating. Maintenance is very low since the unit can be unattended for long periods of time. Materials have been selected for long life even when exposed to nuclear radiation. The cast housing, along with the cover and three plugs, is chemically filmed and painted with polyurethane paint. The gaskets are made of EPDM to increase resistance to radiation.
All hardware is stainless steel.
An indicating silica gel desiccant is also provided to decrease the humidity inside the recorder. Data reduction is very simple, requiring only one measurement and one multiplication for each of the three record plates, to obtain maximum acceleration values. Normally just the maximum is recorded regardless of the direction. A microscope with a reticle graduated in 9.9925 of an inch can be used for medium displacements. Consult Engdahl Enterprises for microscopes.