ISO 10816 vibration severity zones explained UK

Direct answer: severity zones help interpret velocity trends—they do not certify your meter

The ISO 10816 family sets out how to evaluate machine vibration from measurements on non-rotating parts and how to assess severity. In practice that means comparing a measured vibration velocity (commonly in mm/s) with defined severity zones for the relevant machine type and conditions. Using those zones does not mean your instrument is certified to the standard, and it does not replace a competent vibration diagnosis when the plant risk is high.

ISO 10816-1 describes the general requirements for evaluating vibration of various machine types when measurements are made on non-rotating parts and provides guidance for assessing severity. Related parts, including Part 3 for many industrial machines measured in situ, apply that approach to specific machine categories and speed/power ranges. Readers in the UK often also meet the series as BS ISO 10816.

Plain-English mm/s velocity context for rotating machinery

For many motors, fans, pumps and similar rotating machines, handheld spot checks report overall (broadband) vibration velocity in millimetres per second (mm/s). Severity charts and zone tables in the ISO guidance are there so you can place that reading in context—roughly from a good baseline through caution and into levels that usually warrant investigation—rather than treating a single number as a pass/fail stamp.

ISO 10816-3 (now published as ISO 20816-3 in the newer numbering) is widely used as the international reference for deciding whether an industrial machine’s vibration is acceptable by measuring broadband vibration on bearing housings and comparing the reading with defined severity zones. Always match the zone table to the correct machine group, mounting and measurement conditions; do not apply a chart meant for one class of plant to another without checking the standard.

How handheld spot checks use guidance cautiously

A handheld meter is useful for trend spotting and for a first look during HVAC, motor, engine or generator walk-rounds. Use severity-zone thinking cautiously:

• Take readings at consistent points on non-rotating parts (typically bearing housings), in the same directions and units each time.
• Compare like with like: same machine, similar load and speed, same filter/bandwidth settings if your meter exposes them.
• Treat zone boundaries as decision aids for “watch”, “investigate” or “escalate”—not as proof of root cause.
• Remember this is machine vibration assessment guidance, not hand-arm vibration (HAVS) exposure assessment; different instruments and methods apply to HAVS.

For UK buyers looking up a vibration severity chart for handheld meter UK use, or mm/s velocity severity for motors UK guidance, the safe habit is: zone tables inform trends; they do not overclaim what a spot check can prove.

Hard guardrail: do not invent ISO certification for the shop product

Severity-zone literacy and product marketing must stay separate. No ISO or UKAS certification is asserted for the shop SKU discussed here. Do not assume a meter “meets ISO 10816” merely because you compare its mm/s reading with a published severity chart. Likewise, do not invent lab accuracy claims, calibration certificates or compliance marks that are not stated on the live product page.

If you need accredited measurement, formal acceptance testing or contractual conformance, engage a competent service that works to the required standard and accreditation—not a blog article or a retail listing alone.

Document machine, speed and measurement point

Good notes make severity zones usable. For each spot check, record at least:

• Machine identity and duty (for example HVAC fan, motor, engine or generator).
• Running speed and approximate load, where known—Part 3-type guidance commonly addresses industrial machines with nominal power above 15 kW and nominal speeds between 120 r/min and 15 000 r/min when measured in situ; confirm applicability before relying on a particular table.
• Exact measurement point and direction on the non-rotating structure.
• Units (mm/s), overall/broadband reading, date/time and any change since the last baseline.

Without that context, using severity zones without overclaiming UK expectations becomes guesswork: a high reading on the wrong point, or at an unusual speed, can mislead.

When to seek competent diagnostics beyond a handheld meter

Escalate beyond a simple handheld check when vibration is rising quickly, severity sits in unsatisfactory or worse zones, there is unusual noise or heat, safety or production risk is material, or you need frequency analysis, balancing, alignment or bearing diagnosis. A spot mm/s value can flag a problem; it rarely explains the mechanism on its own.

CTA to Vibmeter Pro after explaining units

Once you are clear that mm/s velocity and severity zones are interpretive tools—not a certificate—you can choose a practical handheld for routine machine checks. Vibmeter Pro is positioned as a Wintact handheld digital mechanical vibration meter for HVAC, motors, engines and generators. Public range language for related listings commonly cites velocity around 0.01–199.9 mm/s; always verify the live product page before purchase, including what is and is not claimed about standards or certification.

View current Vibmeter Pro product details to confirm specifications and suitability for your spot-check routine.