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Dual Channel NAMUR NE43 Trip Amplifier


This report describes an evaluation of two Lee-Dickens BM9432 trip amplifiers (serial no(s): 9405-01-01 and 9405-01-02). A trip amplifier is a switching unit for analogue signals, 4-20 mA. Trip-amplifiers are used in many industries. Their most common use is as discreet switching devices that monitor analogue signals (i.e. an incoming 24Vdc based 4 to 20mA signal can have high and low switching points initiated by the trip-amplifier). These discreet switching points are often for on/off control, or more importantly alarm annunciation or initiating automatic trip logic. Each of the tested units has two settable switch points, and two functional alarms, one for supply voltage and one for signal level. The later fixed switch point will indicate if the input signal is outside normal operating range (as described in the NAMUR NE 43 standard).





11.2 - Microswitches, limit switches


Lee-Dickins Ltd




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