9038

The differential reference 9038 is designed to control pressures between vacuum and +100 % of the instrument’s full scale pressure range. The instrument will control pressures at elevated reference (line) pressures. As an example, if the applied reference pressure was 10 psi (69 kPa) and the requested control pressure was 5.0 psi (35 kPa), the instrument would output 15 psi (105 kPa) on the output port. Standard units are manufactured for atmospheric reference. Elevated reference pressure requires factory modifications. The pressure standard is measured under microprocessor control to maintain the desired control pressure. The rezero solenoid allows the user to execute pneumatic rezero of the pressure standard on demand. The instrument may also be used in a measurement mode by applying the pressure to be measured to the output port. The instrument is protected by bi-directional relief valves designed to vent whenever either the output or reference port exceeds the other by 110% of the full scale pressure.