Positive displacement pumps typically cause discharge pressure pulsations, especially when pumping liquids that are non-compressible and even more so at higher pressures. Well stimulation pumps, mud pumps, and pumps used to cement well casings are all examples of applications that have historically been plagued with pulsating pressure. Yet, it is of utmost importance to know the discharge pressure so that the over-pressure shutdown system can operate effective and quickly in the event of a sudden rise in pressure. Details : 1502 Hammer Union pressure transmitters made by Viatran, GP-50, or a number of other companies are typically used to measure the pressure. Usually there is some attempt to use software averaging to stabilize the displayed value. But in order for the system to be responsive to an over pressure condition, up until now, not much could be done. The compass Instruments Pressure Dampener is connected to the 1502 type pressure transmitter and the output is a smooth and clean 4-20 milliamp signal that is delayed only approximately 1 second. Additionally, the pressure transmitter is electrically isolated so chassis grounds and signal grounds at different levels are no longer a problem. The unit actually has two isolated outputs, one with a smooth, clean, 4-20 mA signal that has about 1 second delay, the other that has a 4-20 mA signal with little to no delay but the same pressure pulsations as are on the input. Most all standard 1502 Hammer Union pressure transmitters have a built in shunt calibrate function connected to connector pins This calibrate function is also electrically isolated and still function as always So the operator can continue to calibrate his equipment right through this device as though it was not there. Gets Rid Of Pulsation Noise In Pressure Signals. Allows Pressure Dis-Play To Be Stable. Provides Clean Data For Data Logging And Plotting. Provides Electrical Isolation Preventing Ground Problems.