RONDA VM-4

Continuous vibration monitoring — rotating machinery

The bearing gave
nineteen days’ notice.

Every rotating machine announces failure in its vibration signature — most plants just aren’t listening. RONDA VM-4 bolts onto the bearing housing, reads the signature around the clock, and calls your maintenance planner the day the trend leaves zone B. Notice in weeks, not minutes.

Request a 30-day pilot See specifications
FIG. 1 — Illustrative 30-day velocity trend. Drive-end bearing, 75 kW slurry pump. Envelope analysis flags an outer-race fault; alert at the zone C boundary, 19 days before the planned stop. PAPER 1 mm · PEN 0.4 s
X1Signal chain

Sixty seconds from bearing to planner.

No gateway project, no historian integration, no six-month rollout. The node does the analysis at the machine; only verdicts travel.

:1

Acquire

A three-axis piezo accelerometer samples the housing at 25.6 kHz. One M6 stud, torqued once. With the wireless option there is no cable to pull — the radio is in the node.

3-AXIS ±50 g · M6 STUD · IP67

:2

Resolve

The node runs an FFT and envelope analysis on-board — every sixty seconds on line power, hourly on battery, with a continuous band-RMS watchdog in between. It knows the difference between a bad bearing and a loose foot.

FFT 25,600 LINES · ENVELOPE · ISO 20816

:3

Notify

When the trend leaves zone B, your planner gets the fault type and the trend curve — routed to the CMMS, not to a panel light nobody watches. A remaining-life estimate follows if the trend climbs toward zone D.

E-MAIL / SMS · OPC UA · CMMS WORK ORDER

X2Severity zones

Severity is not an opinion.

RONDA evaluates every machine against ISO 20816 vibration severity zones — the same chart your insurer and your OEM already accept. When the alert comes, the argument is over before it starts.

Vibration severity — ISO 20816-3, group 2, rigid mounting VELOCITY mm/s RMS
A — Good

Newly commissioned condition. Logged, nothing more.

B — Acceptable

Unrestricted long-term operation. Trended weekly.

C — Alert

Restricted operation. Planner alerted with fault type and trend.

D — Damage

Damage risk. Alarm escalated; remaining-life estimate attached.

Zone boundaries and RONDA response (ISO 20816-3, group 2, rigid mounting)
ZoneVelocityISO evaluationRONDA action
A≤ 1.4 mm/sNewly commissionedLog
B1.4 – 2.8 mm/sUnrestricted long-termLog + weekly trend
C2.8 – 4.5 mm/sRestricted operationAlert planner, fault ID
D> 4.5 mm/sDamage riskAlarm + remaining-life estimate

Boundaries ship per machine class and mounting; configurable per asset.

X3Specifications

The datasheet, without the sales call.

Sensing
3-axis piezoelectric, ±50 g; 0.5 Hz – 10 kHz axial, 5.5 kHz transverse (±3 dB)
Sampling
25.6 kHz per axis, simultaneous
Analysis
On-node FFT (25,600 lines), envelope demodulation, ISO 20816 band RMS
Trend memory
90 days on-node, non-volatile
Mounting
M6 stud (preferred) or rare-earth magnet base
Housing
Machined 316L stainless, IP67, −40 to +85 °C
Connectivity
LoRaWAN 868/915 MHz or 10BASE-T1L single-pair Ethernet
Power
24 V DC (M12) or Li-SOCl₂ cell (hourly spectra), 5-year service life
Alarm routes
E-mail, SMS, OPC UA, CMMS work-order API
Commissioning
One node, one stud, 15 minutes. No PLC changes.
X430-day pilot

Put it on your worst pump.

Thirty days, one machine, no software install on your side. If RONDA doesn’t find anything worth fixing, unbolt it and send it back — that has happened, and it’s the cheapest good news a plant can get.

  • ▪ 1 × VM-4 node, stud + magnet mounts
  • ▪ Commissioned in one visit
  • ▪ Weekly trend review included
  • ▪ No purchase commitment
Request a 30-day pilot

Tell us the machine, the kW rating, and what it did to you last time.