4131 Type - Universal Trip Amplifier. The 4131 is universal trip amplifier with 1-channel. Programmable via detachable display front (4501), process calibration, relay simulation, password protection, error diagnostics and selection of help text in several languages. Universal trip amplifier Input for RTD, TC, Ohm, potentiometer, mA and V 2 adjustable alarm limits When 4131 is used with the 4501 display / programming front, all operational parameters can be modified to suit any application Please order the Display Front PR4501 separately (stock-no. ; 796-6890 796-6890 ) Process control with 2 pairs of potential-free relay contacts which can be configured to suit any application Trip amplifier with window function defined by a high and a low setpoint. The relay changes state outside the window FM-approved for installation in Div. 2 2 relay outputs Universal AC or DC supply