The Pressure Cell Model EPS-30V-J (MTI.EWS.ER.M-PS-30V-J) basically consists of a
circular flat capsule, connected to a specially designed
pressure sensor by electron beam welding, concentric with
the back plate of pressure capsule. The space confining the
hydraulic fluid is entirely metal. No ‘O’ rings are used, the
external construction being welded. This helps in increasing
the cell stiffness thus materially improving the performance
of the cell.
Like any closed hydraulic system, pressure cell is sensitive
to temperature effects. Any change in temperature of
surrounding concrete can give an unauthentic reading,
magnitude of which depends upon elasticity of surrounding
concrete and relative coefficient of expansions of materials
in contact & filled fluid inside the pressure cell. The sensor
has an in-built thermistor to assist in separating these
unauthentic temperature effects from actual pressure
changes.