Read roast curves and Rate of Rise in Giesen Profiler 2

Use roast curves to follow temperature changes, relate them to roast events, and review a finished batch. You can use this guide with a recording of your first roast; an existing roast profile is only needed if you want to display Reference curves.

If you have not recorded a roast yet, start with Record your first roast in Giesen Profiler.

Understand the lines

The horizontal axis shows time. Temperature and Rate of Rise use different scales, so check the scale for the value you are reading. Move the pointer over the chart to inspect readings at a particular point.

Available lines depend on the connection, sensors and settings. Colours can be customised, so identify a line by its label rather than by colour alone.

Read RoR without confusing it with temperature

A rising Beans curve means the measured bean temperature is increasing. RoR describes how quickly it is increasing:

• Positive RoR: the temperature reading is rising.
• RoR near zero: the temperature reading is changing very little.
• Negative RoR: the temperature reading is falling.

A falling RoR that stays above zero means the temperature is still rising, but more slowly. For example, a change from 10 to 6 °C per minute is a slower rise, not a fall in temperature.

Check the RoR period

Where these settings are available, open Settings → General, find RoR Periods under Roasting, and select 15s, 30s or 1m. Click Apply Changes after changing a setting.

The same rate can be expressed as 10 °C/min, 5 °C/30s or 2.5 °C/15s. These are equivalent examples, not target values for a roast. Check both the temperature unit and the RoR period before comparing numbers.

Saved roast charts retain their recorded readings. Changing the current RoR period does not recalculate an older recording.

Make the dashboard chart easier to read

1. Open Legend from the toolbar on the right of the dashboard.
2. Start with Beans, Air and RoR visible, if your connection provides them.
3. Hide lines you do not need for this check. Hiding a line changes the display; it does not delete recorded data.
4. If you have loaded a profile, enable the relevant (Reference) lines to compare them with the current roast.

The Legend panel also lets you show or hide individual event markers.

Adjust the scales

If chart settings are available for your account, open Settings → Chart:

• Time Axis: set a range that includes the roast duration.
• Measurement Axis: set a range that includes the temperature readings you want to inspect.
• Rate-of-Rise Axis: set a range that includes the RoR readings. Include negative values if you want to see the initial fall.
• Step: set the spacing between scale markings.

Click Apply Changes. Under Appearance, you can also try Split chart when the display feels crowded. These settings change how the chart is drawn.

Connect the curve to roast events

Use event markers to understand where you are in the roast:

• Charge: the point associated with loading the beans into the roaster.
• Turning point: the point where the bean probe reading stops falling after charge and starts rising. Profiler detects this from the readings.
• Color change: the colour change you observe and mark during the roast.
• First crack: the first crack you hear and mark.
• End: the end of the recorded roast.

A drop in the bean probe reading after charge is expected as the probe responds to the newly loaded beans. Read this together with the turning point and the later rise.

During recording, use Color change when you observe the change and Crack when you hear first crack. See the first roast guide for the recording steps. Event times depend on when you mark them; a bend in the curve alone does not confirm first crack.

Review a saved roast

1. Open Roasts and click the roast name.
2. Scroll to Chart and enable Show Events.
3. Move the pointer over the chart to inspect readings.
4. Check the Events table for event times and bean temperature readings.
5. Review the Roast phases table, where available, alongside the total duration and first crack details.

If Show BBP is available, turn it off to focus on the roast itself. Turn it on when you want to inspect the recorded between-batch period as well.

Compare batches fairly

When reviewing two batches, check that they used comparable beans, batch sizes, roaster and probe setup. Compare event times, temperature readings and RoR using matching units and RoR periods. Use comparable chart scales: changing the scale can make the same curve look steeper or flatter.

If a dashboard Reference curve is available, compare the same measurement at the same stage of the roast. The reference is a previous or planned comparison, not a guarantee of the same result. Use your tasting notes to assess the coffee alongside the chart.

Common questions

Why is a line missing?

Check Legend first. For Air RoR, also check Enable Air RoR in Settings → General, where available. A connection must supply the relevant temperature readings for those curves to be available. Enabling a display option cannot create readings that were not recorded.

Why can I not see a Reference curve?

Check that a profile is loaded and that its Reference lines are enabled in Legend. A new profile created from scratch may have setpoints without recorded temperature curves. You can still record and review a roast without a reference. See Use a saved roast profile.

Why does RoR look uneven or disappear?

RoR responds to changes in successive temperature readings. Check whether the Beans reading is updating normally and whether the connection is stable. Also check that the RoR axis includes the values you are trying to view. A short spike alone is not enough to judge the whole roast.

Why is a saved roast unavailable on another computer?

Check that the roast and its details have synchronised. Follow Resolve cloud synchronisation problems.