Data Logger
A multi-channel recorder that captures roast temperatures over time for later analysis.
Overview
A data logger turns a roast from a memory into a dataset. It samples your probes at a fixed interval and stores the trace, so you can overlay today's roast against yesterday's, spot where they diverged, and make one informed change at a time.
Using it well
- A 1 Hz sample rate is plenty for roasting. Faster sampling mostly captures noise.
- Name files with the date, coffee lot and roast level. Unlabelled logs become useless within a month.
- Record ambient temperature too. It explains a surprising share of batch-to-batch variation.
Keep the logger and its wiring clear of the hot drum and burner area. Route cables so they cannot fall onto a hot surface, and never run mains-powered equipment with a damaged lead.
Why this matters
The data logger sits in the roasting stage of a roast. Getting it right removes one source of variation, which matters because roasting rewards consistency more than any single clever adjustment. Change one variable at a time, record what you did, and compare batches rather than judging any single roast in isolation.
If you are building a complete setup, start with the instruments that measure what is happening - a probe, a scale and a logger - before buying anything that promises a better result by itself. Measurement first, equipment second.
Educational content. Roast Lab does not sell this or any other product, and we do not accept payment for coverage. Specifications listed above describe typical ranges for the category rather than any specific model, and vary between manufacturers. Always follow the manufacturer instructions and safety documentation supplied with your equipment.
Related tools
Drum Roaster
A horizontal rotating drum heated by gas or electricity - the most common home and commercial roaster design.
Fluid-Bed Roaster
A hot-air roaster that suspends beans in a stream of heated air, roasting fast and clean.
Sample Roaster
A small-capacity roaster built for quick evaluation batches of 50-120 g.
Bean Probe
The temperature sensor that reads the actual bean mass inside the drum.