Positive Step Pressure Generator
Harwood’s positive step pressure generator is designed for the calibration of dynamic gauges used in ballistic pressure transducers and similar applications. The device requires a pressure generating system – typically Harwood’s air operated panel – to feed the high pressure reservoir via the 12H connection located on the top of the device. When the quick-opening valve is triggered, fluid from the high pressure reservoir enters the sensor cavity in approximately 0.2 milliseconds.
This device can accommodate 4 transducers at a single time, making it a useful tool for examining transducer response characteristics to rapid positive pressure steps and comparing the relative response behavior of several transducers to a common pressure step.
Final pressure step values can be traced to conventional deadweight calibration figures with an accuracy of 0.4% percent by using a Strain Gaged Cell as the static reference gage at the pressure source. The precisely known reference pressure can be adjusted over a wide range of amplitudes- anywhere between 0 – 5,000 psi up to 0 – 150,000 psi.
Contact Harwood Engineering for more information on our dynamic gauges and other high pressure products and services.