The 991-01-XX-01-05 991 Thrust Transmitter is designed primarily for OEMs of centrifugal air compressors, small pumps, motors, or fans, providing a simple 4 to 20 mA proportional axial displacement (thrust) signal to their machinery control systems. This 2-wire, loop-powered device accepts input from the 3300 NSv proximity probe and its matching extension cable, available in 5 m and 7 m system length options. The transmitter conditions the signal into appropriate engineering units proportional to the shaft’s axial position and outputs a 4 to 20 mA industry-standard signal for input to the control system, where machinery protection alarming and logic are handled.The 991-01-XX-01-05 991 transmitter provides the following notable features:
-Integrated Proximitor Sensor requires no external unit
-Non-isolated "PROX OUT " and "COM" terminals plus a coaxial connector provide a dynamic vibration and gap voltage signal output for diagnostics.
-Non-interacting zero and span potentiometers under the Transmitter label supports loop adjustment.
-Test Input pin allows quick verification of loop signal output, using a variable DC voltage source as the input.
-A Power-up Inhibit circuit eliminates signal errors due to line voltage transients.
-A Not OK/Signal Defeat circuit prevents high outputs or false alarms due to a faulty proximity probe or loose connection.
