Precise control of brew temperature is a decisive factor for the quality of espresso. To measure this temperature reliably, the Scace 2 was developed as a temperature measurement portafilter - a precision measuring instrument that primarily measures temperature, and optionally pressure as well, directly at the brew group. On one hand, we use the Scace 2, which we have had adapted for various portafilter sizes. Currently, 7 Scaces are in use in our two coffee academies and in the test laboratory. Additionally, we use two other temperature measuring devices for espresso machines to check the behavior of various portafilters and machines against one another. One of these portafilters has, in addition to a temperature probe, a pressure and flow recording that can be digitally captured.
Principle of temperature measurement in the portafilter
Temperature measurement in the portafilter is complex because it must be done under realistic brewing conditions. A simple thermometer in the water flow is not sufficient, as the extraction and typical conditions must be simulated that also occur during a classic pull in the portafilter. This includes water flow, pressure, the so-called headspace, i.e., the space between the coffee puck and the shower. The Scace 2 solves this problem by:
- Positioning a Type-T temperature probe at the correct location
- Simulating the coffee puck through a special rubber insert
- Mimicking the correct water flow
Compared to coffee, there are still deviations, since the rubber insert, for example, cannot absorb brewing water. This must be taken into account when calculating the water quantity.
The Scace 2 Thermofilter in detail
The Scace 2 is an advanced measuring instrument with the following features:
- Precise temperature measurement: It measures temperature to 0.1°C accuracy.
- Fast response time: The temperature probe responds in less than 0.25 seconds.
- Integrated pressure measurement: A glycerin-filled manometer shows the brewing pressure. There are Scaces with and without pressure measurement.
- Simulation of the coffee puck: A plastic insert with low thermal conductivity simulates the resistance of ground coffee.
Application and benefits
The Scace 2 is inserted into the brew group like a normal portafilter. It is suitable for:
- Commissioning and maintenance of high-quality espresso machines
- Quality control in coffee shops and roasteries
- Precise machine adjustment for reproducible results
- Espresso machine tests and comparability of espresso machines (WBC Protocol, Coffeemaker Protocol.
Special custom-made Scace 2 for Quick Mill espresso machines with three bayonet wings.
Technical limitations
- Compatible with most commercial E61 brew groups as well as 58mm brew groups such as La Marzocco, Rancilio, Rocket, ECM, Maro, etc.
- For testing various other espresso machines, we have had special portafilters made in sizes 53, 54, and also 57 that function according to the same principles. In this way, we have also measured inexpensive machines like the Delonghi Dedica.
- Requires a digital thermometer with Type-T connector for temperature display.
Our test equipment collection has escalated slightly over the years.
Portafilter for recording flow, temperature, and pressure conditions in the portafilter.
