Rotational speed gauge

Who it’s for

Maintenance engineers, machine operators, and plant supervisors ask “where does the current speed sit on the full operating scale, and which zone is it in?” They need a gauge that shows absolute position within the speed range, not just a number.

What it does

A device reporting rotationalSpeed = 1200 RPM renders a radial gauge with the needle pointing to 1200 on a 0–4500 RPM arc divided into colored zones: blue for Low (0–500 RPM), green for Normal (500–1500 RPM), orange for Elevated (1500–3000 RPM), and red for High (3000–4500 RPM).

• Radial gauge shows position within the 0–4500 RPM operating range at a glance
• Color-coded arc zones let operators read the operating band without checking thresholds
• Shows one asset’s data per widget; add multiple widgets to monitor different motors or drives side by side

How to set up

Data keys

Key	Role	Type	Description
rotationalSpeed	Gauge value	Timeseries	Rotational speed in RPM; change the key name to match your device’s telemetry key

The widget ships with a simulated function datasource key labeled Rotational speed, so it draws random values until you point the datasource at a device and rename the key.

To point it at your own device: open the dashboard in edit mode, open the widget’s Datasources, pick the entity or entity alias, and replace the function key with the key your device reports.

Value ranges

Range (RPM)	Level	Color
0–500	Low	Blue
500–1500	Normal	Green
1500–3000	Elevated	Orange
3000–4500	High	Red

How to customize

• To change the gauge range — open the widget settings and adjust the minimum and maximum values to match your machine’s full-scale speed range.
• To change the zone boundaries — adjust the band thresholds in the widget settings.
• To change the zone colors — edit the color for each operating band in the widget settings.

Tips

• Set the gauge maximum to the overspeed trip point or the maximum rated speed of the machine — this puts the red zone at the threshold that actually matters rather than an arbitrary number.
• The radial gauge format is reminiscent of a tachometer and is immediately intuitive to machine operators; the needle position is readable from a greater distance than a numeric card.
• Pair with a vibration gauge on the same row for a side-by-side mechanical state view — speed and vibration together can reveal resonance conditions at specific RPM ranges.