Temperatures of Silvia without coffee

This test was to measure the water temperatures both from the boiler surface and the PF filter without coffee (blank shots). Test were done after the warming period described in the previous test. The following general view of the measurements do not reveal details (shots are less than 30 seconds), but it gives a good overall view of the test:

The blue line is the boiler surface temperature and the red line is the filter temperature. The water amount has been marked at the appropriate boiler surface temperature level. One can notice that the starting temperature of the boiler heating varies more than in the idle mode. Also the cold water coming to the boiler causes the temperature to go clearly below the 90 degC mark, if the water is already rather cool or if the water mass flow is 80 ml (tests I, V and VII.

When we zoom at the water release moments, following results are obtained (click larger to see more clearly):

The time cycle is only one minute, and the first two tests were done in lower boiler surface temperatures (94 °C and 100 °C), test VI in 102 °C and all others in 104  °C. At the first two tests and if 80 ml of water was released, the heating process started during or right after the release was ended. Usually with 50 ml the filter temperature either didn't or could barely reach the maximum temperature. With 80 ml the maximum temperature was reached and kept for the rest of the water release.

When the boiler temperature was 104 °C, in most cases the filter maximum temperature was 96 °C. After the test the thermocouples were calibrated and showed good accuracy +/- 0.2 °C at 100 °C.

Measurement reports
Heating and cooling testing
Blank shot testing
Single shot testing
Temperature measurements - main page