Extra-Compact Bearing MonitorModel NB-4A

MOTION & CONTROLTM

It’s no bigger than your hand, but the NB-4A bearing monitor can provide early warning of trouble in bearings and other machine parts

■Features1．Extra-Small Size and Ease of Handling　No bigger than your hand, the NB-4A Bearing Monitor can be easily carried around shops

to check the condition of bearings -- with or without a connecting cable for the pickup.２．Easy Detection of Trouble　A simple criteria for evaluating vibration, which was devised by NSK, allows easy evalua-

tion of operating condition without reference to past data.３．Usable as a General-Purpose Vibration Instrument　The NB-4A virtually complies with the ISO 2954 standard for measuring vibration sever-

ity. The NB-4A is also suitable for measuring common mechanical vibrations.４．Wide-Range of Diagnosis Capabilities Ranging from Low to High Speeds　Selection of either a high- or low-sensitivity range is possible for measuring a wide range

of vibrations.５．Easy-to-Read Digital Display　The NB-4A monitor has an LCD panel that displays data in digital format, and includes a

hold button that “freezes” the display for ease of use.６．Greatly Improved Vibration Pickup　The piezoelectric pickup has been greatly improved for high-frequency response, which

provides sufficient detection capability for high-frequency vibrations.７．Signal Output Terminals　Includes an AC output terminal providing vibration signal and waveform envelope for

conducting evaluations, as well as an audio output for earphones.

Standard Components1. Main body 2. Vibration pickup 3. Output cable4. Pickup connecting cable 5. Battery

5

3

2

4

1

■SpecificationsExtra-Compact Bearing Monitor　Model NB-4A

Model NB-P100＊1 NB-P101＊2(optional)

Photos

Mounting Hand-held probe Mounted with magnet or screw Workingtemperaturerange －10 ℃ to ＋80 ℃ －20 ℃ to ＋80 ℃ Dimensions φ20×97（L）mm 14（HEX）×44（L）mm Weight 60 gm (excluding cable) Main body 32 gm, magnet 23 gm Type Piezoelectric acceleration type (built-in preamplifier) Sensitivity 2.6 mV/m/s2

Cable φ4.5 helical cord (about 2.5 m when extended) Functions Displacement, velocity, acceleration (selectable) Readings Effective (rms) value, peak value (selectable) Frequencyrange

Displacement, velocity 10 Hz to 1 kHz Acceleration 1 kHz to 15 kHz Displacement 0.001 to 1.999 mm p-p Velocity 0.001 to 1.999 cm/s pk, rms Sensitivityrange

Acceleration 0.001 to 1.999 da m/s2　pk, rms Displacement 0.01 to 19.99 mm p-p Velocity 0.01 to 19.99 cm/s pk, rms Acceleration 0.01 to 19.99 da m/s2　pk, rms Vibration waveform signal About 1 Vrms full scale Output Envelope signal About 0.5 Vrms full scale Earphone output About 5 mW Display 31／2 digit LCD Low battery voltage “BATT” indicated Indications

Excessive input “OVER” indicated PEAK mode selected LCD decimal pt. flashes Crest factor warning LED flashes (pk/rms > 7) Data display on HOLD HOLD LED flashes Powersource Dry battery, 6F22 (9V). Continuous service time about 10 hrs. Ambienttemperaturerange － 5 ℃ to ＋45 ℃ Dimensions 150（H）×80（W）×29（D）mm Weight 400 gm

VibrationPickup

NB-4AMainBody

High

range

Low

range

Notes:＊ 1 ．Probe-type pickup (NB-P100) can be connected directly to the main body by detaching the helical cord.＊ 2 ．Magnetic pickup (NB-P101) can be connected by magnet or screw.

CAT. No. ESP-140131 2014 Z-4 ©NSK Ltd. First edition published in FEB. 2014Eco-awareness and

reliability in motion

For more information about NSK products, please contact : www.nsk.com

NSK Ltd. has a basic policy not to export any products or technology designated as controlled itemsby export-related laws. When exporting the products in this brochure, the laws of the exportingcountry must be observed. Specifications are subject to change without notice and without anyobligation on the part of the manufacturer. Every care has been taken to ensure the accuracy of thedata contained in this brochure, but no liability can be accepted for any loss or damage sufferedthrough errors or omissions. We will gratefully acknowledge any additions or corrections.