In some aspects, a target net treating pressure for an injection treatment of a subterranean region is determined. The circuit outputs a large signal high enough to assert a logic High and Low by variations of the threshold voltage controlled by the bulk input signal and amplification of the sense amplifier. The injector block has at least one plate in which a cooling channel or a cooling bore through which cooling medium can flow is arranged. A data protection level method comprises setting a numerical value of a system dynamic data protection level for each system of nodes; and in response to user input, setting a value of a data protection level for one or more data objects in a system, the value being a fixed numerical value or a dynamic value.