# Condition Trend

> A dashboard item that draws one asset's vibration or temperature over time against its watch and alarm limits, and when the trend reaches the limit.

Source: https://proxus.io/docs/analyze/dashboard-items/condition-trend

The **Condition Trend**  draws one asset's measurement, such as
vibration or bearing temperature, over time against its limits. Use it to see whether a machine is getting worse and
how soon it reaches its alarm limit.

- **Zones.** The normal, watch and alarm zones are bands behind the line, with the two limits as dashed lines.
- **Marks.** Every moment the value entered the watch or the alarm zone is marked on the line.
- **Headline.** The latest value, its zone, and a note: that the value is above the alarm limit, when it reaches the
  alarm limit at the current trend, or whether it is rising at all.
- **Projection.** While the value is rising, a dotted line extends the trend of the last days to the alarm limit.

The projection is a straight line through the recent values, labelled as such. It is not a remaining-life model and
does not say when the machine will fail; it says where the trend leads if nothing changes.

With several assets in the data, the asset closest to its alarm limit is shown first and a list picks another. A
dashboard filter, such as a card selected on the [Asset Health Board](https://proxus.io/docs/analyze/dashboard-items/asset-health-board),
narrows it to one asset.

## Data fields

**Asset**, **Time** and **Value** are all required: one row per asset and time, for example an hourly average.

## Settings

- **Watch limit** and **Alarm limit** set the zones. Keep the watch limit the lower of the two.
- **Unit** is written after the values (for example `mm/s` or `°C`).
- **Trend over the last (days)** is how many days of values the projection is drawn through.

## Where to see it

The Meridian demo plant uses it for vibration on **Meridian · Condition Monitoring Command Center**.

## Related

- [Asset Health Board](https://proxus.io/docs/analyze/dashboard-items/asset-health-board)
- [Deteriorating Assets](https://proxus.io/docs/analyze/dashboard-items/deteriorating-assets)
- [Proxus dashboard items](https://proxus.io/docs/analyze/dashboard-items)