• ristretto! supports analog and digital, factory-calibrated TSic precision temperature sensors. Accuracy exceeds Pt100 Class B.
• ristretto! offers significantly more measurement resolution and calibrated accuracy than most other PID controllers by utilizing 24bit ADC circuits and calibrated digital sensors on supported modules
• Multiple sensors may be connected simultaneously, for example a boiler sensor, a cup sensor, a PCB sensor and a reference sensor
• ristretto! supports pressure sensors and flow meters to measure pressure, volume and flow rate

Ultimate temperature control (PID)

• Dual channel PID function for up to two heating elements (two boilers or one boiler plus one electronically heated brew group)
• PID parametrization: Different PID configurations can be used during different states of the machine (idle phase, shots)
• "Ramp & Soak" feature for programmed heating, independent of measurements, to manually optimize the brew temperature during espresso shots
• Feed-forward control based on flow meter measurements
• Dual setpoints for normal control and eco mode
• Setpoints can be changed in steps of 0.1°C. The internal resolution is 0.0625°C
• Automatic determination of PID configuration by auto tuning program
• Advanced PID configuration options such as digital filtering and integral wind-up limiting
• Configurable Standby feature and ECO mode to conserve energy

Useful programs

• Automatic determination of PID configuration by auto tuning program
• Calibration program for analog sensors

Grinder control

• Grind timer: ristretto! can run a grinder for a programmed time for single or double shots

Clock and timer

• Clock and weekday timers to turn the heating elements on and off automatically
• Alarm clock function

Information at your fingertips

• Three lines of output on a LCD display convey status information: temperatures, setpoints, heat output, pressure (in bar), shot volume (in ml) etc.
• Comfortable text menus instead of cryptic numbers (most PID controllers only have 7-segment numerical displays)
• Backlight, brightness and contrast are controlled by the firmware¹
• ristretto! continuously transmits measurements to a PC connected by USB or Bluetooth where they can be viewed on a Virtual LCD or as real-time plots. Visual and numeric presentation of live PID data permits unprecedented insight into PID configuration
• PID controllers switch power rapidly but with ristretto!, this will not cause a randomly flickering boiler light because ristretto! controls the boiler lamp independently to convey useful state information
• Adjustable brightness of PID lamp (LED)

Real-time plots on PC

Monitoring and safety features

• Monitoring of water filter's age and liter throughput
• Water hardness calculator and scale buildup monitoring
• Backflushing reminder
• Safety functions monitor the on-times of heating elements and sound an alarm if operator error is detected

Invisible

• Support for internal installation without LCD display (remote configuration by computer via Virtual LCD program)
• Instead of an obtrusive display, a discreet toggle switch can be installed as temperature selector.

Training functions

• Shot timer to make by-the-rules espresso with perfect 25s timing
• Ready-beep signals when the machine is thoroughly heated up

1: If supported by the hardware. Some features depend on the microcontroller module and are not available on all supported platforms. For example, easy-Kit modules do not support analog temperature sensors.