Category: Vibration Monitoring

Manufacturer: Bently Nevada

Bently Nevada TK-3 Proximity System Test Kit

product id: 106089

Category: Vibration Monitoring

Manufacturer: Bently Nevada

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Features

Integrated Proximitor Sensor requires no external unit
Non-isolated “PROX OUT" and "COM" terminals plus a coaxial connector to 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 for quick verification of loop signal output, using a function generator 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
Choice of DIN-rail clips or bulkhead mounting screws as standard options simplifies mounting
Potted construction for high humidity (up to 100% condensing) environments
Compatibility with 3300 NSv proximity probe allows transducer installation in small areas with minimal clearance, typical of centrifugal air compressors

The Bently Nevada 990 Vibration Transmitter is intended primarily for the original equipment manufacturers (OEMs) of centrifugal air compressors or small pumps, motors, or fans who prefer to provide a simple 4 to 20 mA proportional vibration signal as the input to their machinery control system.

The 990 vibration transmitter is a 2-wire, loop-powered device that accepts input from Bently Nevada's 3300 NSv proximity probes and a matching extension cable (available in 5 m and 7 m system length options). The transmitter conditions the signal into appropriate peak-to-peak vibration amplitude engineering units, and provides this value as a proportional 4 to 20 mA industry-standard signal as the input to the control system where machinery protection alarming and logic occurs.

Bently Nevada 990 Vibration Transmitter Specifications
Input	Accepts 1 non-contacting 3300 NSv Proximity Probe and extension cable
Power	Requires +12 to +35 Vdc input at the transmitter terminal
Signal Output	4-20 mA
Loop Accuracy	Within ±1.5% over specified full-scale range
Probe Gap	Probe must be gapped between 0.5 and 1.75 mm from target to ensure full scale range
Maximum Loop Resistance	1,000 Ω including cable at 35 Vdc
Current Limiting	23 mA typical
Zero and Span	Non-interacting external adjustments
NOT OK/Signal Defeat	Signal output will go to less than 3.6 mA within 100 μs after a Not OK condition occurs. Signal output is restored within 2-3 seconds after the Not OK condition is removed
Power-up Inhibit	Signal output stays at less than 3.6 mA for 2 to 3 seconds after power is applied
Proximitor Sensor Output	Compatible with ungrounded, portable test equipment. When using grounded, ac-powered test equipment, use the 122115-01 Test Adapter for signal isolation
Output Impedance	Prox Out has a 10 kΩ output impedance calibrated for a 10 MΩ load
Prox Out Linear Range	1.4 mm. Begins at approximately 0.25 mm from target surface
Prox Out Incremental Scale Factor	7.87 mV/μm (200 mV/mil) ± 6.5% typical including interchangeability errors when measured in increments of 0.25 mm over the linear range using a flat 30 mm target. Worst case 7.87 mV/μm ± 10%. Typical Noise Level: 50 mV/pp
Temperature Stability	Incremental scale factor remains within ±10% of 7.87 mV/μm from 0 °C to +70 °C
Frequency Response	5 Hz to 6,000 Hz +0, -3 dB
Minimum Target Size	9.5 mm diameter
Leadwire Length	Maximum for Proximitor Sensor Output (BNC connector), maximum cable distance is 3 meters
Electrical Classification	General Purpose Approval by Canadian Standards Association (CSA/NRTL/C) in North America and by VDE in Europe. 990 has the CE mark for Europe