Brand: Brüel & Kjær

Bruel & Kjaer Vibro VC-920 Vibration Monitor

Name: B&K Vibro VC-920 Vibration Monitor | ISO 10816 – Datasheet
Brand: Brüel & Kjær

Description

Overview

The Bruel & Kjaer Vibro (Vibrocontrol) 920, or VC-920 vibration monitor, is a compact, single-channel unit for permanent machine protection. It measures vibration velocity in RMS according to ISO 10816, compares the value with two adjustable alarm limits (Alert and Danger), and drives relay outputs for annunciation and machine shutdown – all in a small DIN-rail or mounting-plate enclosure for control-cabinet installation.

Engineering and Design

The VC-920 accepts acceleration sensors (AS-022, AS-062 CCS, ASA-022 Ex) or velocity sensors (VS-068, VS-069, VS-0168, VS-0169), supplying -24 V DC sensor power up to 30 mA. Measuring ranges are 0-10, 0-20, 0-50 or 0-100 mm/s RMS over a frequency range of 10 to 1000 Hz, with 5% accuracy of the measured value. Each alarm channel has an adjustable 0-100% of range limit and an adjustable delay of 0-100 s to avoid false trips during start-up or transient events.

Outputs include a 0/4-20 mA analog output (load under 500 ohms, or 0-10 V) for the DCS/PLC, plus alarm, shutdown and OK relays with latching or non-latching selection. Power can be 230/115 V AC +/-15% (about 12 VA) or 24 V DC (18-32 V, about 7 W). The unit operates from 0 to +50 C and is housed in a plastic IP20 enclosure measuring 150 x 78 x 115 mm at about 0.9 kg.

Key Features

Single-channel vibration velocity monitor per ISO 10816 (DIN 10816)
Two adjustable alarm limits (Alert, Danger) with 0-100 s delay
Alarm, shutdown and OK relays; latching or non-latching
Measuring ranges 0-10/20/50/100 mm/s RMS, 10-1000 Hz, 5% accuracy
Works with B&K Vibro acceleration and velocity sensors; -24 V sensor supply
0/4-20 mA analog output (load under 500 ohms) or 0-10 V
Dual power: 230/115 V AC +/-15% or 24 V DC (18-32 V)
Compact 150 x 78 x 115 mm plastic housing; DIN rail or mounting plate

Applications

Permanent vibration monitoring and protection of fans, pumps, motors, gearboxes and rotating machines in power plants, oil and gas, water and general industry, with alarms per ISO 10816.

Specifications

Channels	1
Sensors	Acceleration AS-022, AS-062 CCS, ASA-022 Ex; velocity VS-068, VS-069, VS-0168, VS-0169
Sensor Power	-24 V DC, max 30 mA (or 4 mA CCS)
Measuring Ranges	0-10 / 0-20 / 0-50 / 0-100 mm/s RMS
Frequency Range	10 to 1000 Hz
Accuracy	5% of measured value
Alarms	2 (Alert, Danger), adjustable 0-100% of range; delay 0-100 s
Relays	Alarm, shutdown and OK; latching or non-latching; closed or open circuit
Analog Output	0/4-20 mA, load under 500 ohms (or 0-10 V)
Power Supply	230/115 V AC +/-15%, about 12 VA; or 24 V DC (18-32 V), about 7 W
Enclosure	Plastic, IP20; 150 x 78 x 115 mm; about 0.9 kg
Operating Temperature	0 to +50 C; storage -10 to +70 C
Standard	ISO 10816 (DIN 10816)

Why Seven Star LLC

Seven Star LLC supplies original Bruel & Kjaer Vibro VC-920 monitors, sensors and accessories for machine-protection projects across Oman and the GCC. We verify every unit against the B&K Vibro specification and support sensor selection, configuration and commissioning. Because the VC-920 is legacy hardware within the wider 920 monitoring family, we confirm current availability honestly before quoting rather than assuming stock, and where a genuine unit cannot be sourced quickly we help evaluate whether a repair, a verified used replacement, or a planned move to a currently supported B&K Vibro platform is the right call for your plant.

For facilities running VC-920 monitors on critical rotating equipment such as pumps, compressors, or turbines, we also help plan spares and sensor stock around your scheduled maintenance windows so an alarm-channel failure does not become an unplanned shutdown risk. Our team can review your existing sensor wiring and setpoint configuration before recommending any replacement path, so the guidance we give is grounded in how your specific installation actually operates rather than a generic upgrade recommendation.

Sourcing and Compatibility Support for the VC-920

Vibration monitors from the 920 family were built to a specific set of alarm and output standards, and a replacement unit sourced from a different production batch can carry a different relay configuration or setpoint range even when the model number matches. Before confirming an order, we ask for your current wiring diagram or at least a photo of the terminal block, so we can verify the replacement will interface correctly with your existing alarm and shutdown logic rather than requiring rework once it arrives on site. This step has saved customers from a mismatched unit sitting unused after installation because a detail was assumed rather than confirmed.

We also support facilities that are unsure whether their VC-920 installation still meets current site safety requirements under ISO 10816 or an equivalent internal standard, and can advise honestly on whether continued use, recalibration, or a planned upgrade is the more sensible path. Reach out with your monitor’s serial number and installation details, and our team will confirm genuine availability, realistic lead time, and any compatibility considerations before you commit to an order. We are also happy to advise on longer-term planning if your facility is starting to weigh the cost of continuing to support this legacy platform against a phased move to a newer generation of monitoring hardware, timed around your facility’s own budget cycle and turnaround windows rather than external deadline set by parts availability or a single vendor’s own production schedule alone, which keeps your facility firmly in control of the decision.

Request a Quote for Bruel & Kjaer Vibro VC-920 Vibration Monitor

Send your machine type, sensor requirement and alarm philosophy to our engineering team for a quotation. Use the Inquiry Form below and attach your datasheet or protection specification – we confirm availability and pricing. | Inquiry Form

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About brand

Brüel & Kjær is the Danish name behind two product lines found in industry: precision sound and acoustic instruments, such as the Type 2250 analyser and its measurement microphones, and machine protection and condition monitoring systems from Brüel & Kjær Vibro, such as VIBROCONTROL and VC-6000. Brüel & Kjær was founded in Denmark in 1942. Brüel & Kjær Vibro was formed in 2000 when it merged with the vibration business of Germany's Schenck, and it has been part of Japan's NSK since 2021.

Seven Star LLC is an independent supplier in Muscat. We list Brüel & Kjær vibration sensors, monitors, rack modules and sound instruments, including obsolete modules that are still running in plants in Oman and the GCC, and supply them by exact part number.

Brüel & Kjær company profile

Established	1942, Denmark (Brüel & Kjær); Schenck, the German partner in B&K Vibro, dates from 1881
B&K Vibro	Formed in 2000 from Brüel & Kjær's and Schenck's vibration businesses; sold by Spectris to NSK, completed in 2021, and now NSK's condition monitoring unit
Product families	Eddy-current displacement sensors, velocity and acceleration sensors, vibration monitors, VC-6000 rack systems, sound level meters and analysers, measurement microphones and acoustic test equipment
Applications	Protection of turbines, compressors, pumps and fans; noise measurement and acoustic testing

Milestones

1881: Schenck, later the German partner in B&K Vibro, is founded.
1942: Brüel & Kjær is founded in Denmark.
2000: B&K Vibro is formed from the vibration businesses of Brüel & Kjær and Schenck.
2021: Spectris completes the sale of B&K Vibro to NSK.

Brüel & Kjær products we list

Family	Models	What it does
Eddy-current displacement probes and oscillators	IN-081, IN-083, SD-052, SD-081, DS-1051, DS-1053, OD-1051, OD-1053, OD-162	Measure shaft vibration and axial position on machines with sleeve bearings
Velocity and acceleration sensors	VS-068, VS-069, AS-062, AS-063	Measure casing vibration on pumps, fans, motors and gearboxes
VIBROCONTROL and compact monitors	VC-1000, VIBROCONTROL 1000 CV110, VC-1100, VC-868/1, VC-868/0, VC-920, AMO-622	Alarm and trip on vibration limits for single machines
VC-6000 rack modules	SM-610-A01, SM-610-A02, SM-610-107, SM-610-113, CI-620, CI-615, PS-610, RC-610 rack	Multi-channel machine protection systems for turbines and compressors
Legacy modules	Type 3013 tacho monitor, PS-610 (replaced by PS-615)	Spares for older installed systems
Sound and acoustics	2250-L, 2250-D, Type 2240, 4190 microphone, 4157 ear simulator	Noise surveys, occupational noise and acoustic testing
Cables	AC 0034, AO-0087, AO-0714, AO 0193	Sensor, extension and microphone cables

An eddy-current measuring chain has three parts that must match: the probe, the extension cable and the oscillator (driver). The total electrical length is calibrated as one system, so a probe from one length or model cannot simply be mixed with an oscillator for another. On B&K Vibro part numbers, the digits after the model (for example IN-083/3/070/50/0/206) set the thread, the probe length, the cable length and options, so the full code is needed to supply the right part.

Where Brüel & Kjær products are used

In Oman and the GCC, B&K Vibro sensors and monitors protect gas turbines, steam turbines, compressors, large pumps and fans in oil and gas, power and desalination plants. The sound instruments are used for occupational noise surveys and equipment noise testing.

Ordering Brüel & Kjær parts: what we need

Send the complete part number from the label (including all suffixes after the slash), a photo of the label, and for sensors the probe length, cable length and thread. For rack modules, add the rack type and firmware version if known. For obsolete parts, send the old part number so we can check the replacement.

Facts checked against NSK and Spectris announcements on Brüel & Kjær Vibro, October 2026.

Browse Brüel & Kjær products by category: Vibration, Portable Test & Measurement, Sensors & Transmitters.

FAQ

Questions about the Bruel & Kjaer Vibro VC-920 Vibration Monitor

Answers from our engineering team on installation, compatibility and integration.

01What does the VC-920 measure?

It measures vibration velocity in RMS over 10 to 1000 Hz, with selectable ranges of 0-10, 0-20, 0-50 or 0-100 mm/s RMS, in accordance with ISO 10816.

02Which sensors work with the VC-920?

It works with B&K Vibro acceleration sensors (AS-022, AS-062 CCS, ASA-022 Ex) and velocity sensors (VS-068, VS-069, VS-0168, VS-0169), with -24 V DC sensor power up to 30 mA.

03How are alarms configured?

Two alarms (Alert and Danger) are each adjustable from 0 to 100% of the measuring range with an adjustable delay of 0 to 100 seconds. Alarm, shutdown and OK relays can be latching or non-latching.

04What output signal is provided to the control system?

A 0/4-20 mA analog output with load under 500 ohms (or 0-10 V) is provided for the DCS or PLC, in addition to the relay outputs.

05What power supply options does the VC-920 have?

It accepts 230/115 V AC +/-15% (about 12 VA) or 24 V DC (18-32 V, about 7 W). It operates from 0 to +50 C in a plastic IP20 enclosure (150 x 78 x 115 mm, about 0.9 kg).