The 991 Thrust Transmitter is designed primarily for OEMs of centrifugal air compressors, small pumps, motors, and fans that require a simple 4 to 20 mA axial displacement (thrust) signal for integration into their machinery control systems. This 2-wire, loop-powered device accepts input from a 3300 NSv proximity probe and its matching extension cable (available in 5 m and 7 m system lengths). The transmitter processes the signal and converts it into engineering units proportional to the shaft’s axial position, providing a standard 4 to 20 mA output for control system input, enabling machinery protection, alarming, and logic functions.Key Features：
Integrated Proximitor Sensor, eliminating the need for an external unit.
Dynamic vibration and gap voltage signal output via "PROX OUT" and "COM" terminals and a coaxial connector for diagnostics.
Non-interacting zero and span potentiometers under the transmitter label for easy loop adjustments.
Test Input pin for quick verification of loop signal output using a variable DC voltage source.
Power-up Inhibit circuit, preventing signal errors caused by line voltage transients.
Not OK/Signal Defeat circuit, eliminating high outputs or false alarms due to faulty proximity probes or loose connections.
Flexible mounting options, including DIN-rail clips or bulkhead mounting screws for easy installation.
Potted construction, making it suitable for high-humidity environments (up to 100% condensing).
This transmitter ensures reliable and accurate axial displacement monitoring, making it an excellent choice for applications requiring robust and efficient machinery protection.
A: Full-scale Option
06 0.6-0-0.6 mm
25 25-0-25 mils
B: System Length Option
50 5.0 meters (16.4 feet)
70 7.0 meters (23.0 feet)
C: Mounting Option
01 35 mm DIN-rail clips
02 Bulkhead screws
03 DIN clips and screws
D: Agency Approval Option
00 Not required
01 CSA Division 2
05 CSA Division 2, ATEX Zone 0, ATEX Zone 2 and includes ABS maritime approval
