Bluetooth

Bluetooth Guide | RAPT Temperature Controller

Bonding a RAPT Pill to send telemetry is a powerful and robust way to really leverage the versatility of the RAPT ecosystem.

Please refer to this video for a detailed guide to Bonding your RAPT Pill to your RAPT Fermentation Chamber or Temperature Controller.

Bond RAPT Pill with RAPT Fermentation Chamber or Temperature Controller

Once the Pill has been Bonded to the device, it can be selected in the Settings menu as one of the available Temperature Sensors. Once selected in this menu, temperature control will be ceded to the selected Bluetooth enabled RAPT device, rather than the internal temperature probe. In addition, on the TFT display the current (most recent) Graity and Temperature reading will be displayed. The internal (built in probe) temperature is also displayed. NOTE: this is not displayed in Graph Enabled Mode.

Once the Pill has been Bonded and selected as the Temperature Sensor of the device, powerful Profile features are unlocked.

You can set triggers such as Gravity or Gravity Velocity, as well as Time for your fermentation control.

For example, instead of setting a fairly arbitrary length of time before you start ramping the temperature of your fermentation for a diacetyl rest, you can choose a specific gravity point or (even mrore acurately) a specific Gravity Velocity (rate of change of gravity) as a trigger point for increasing the temperature.

A common Fermentation Profile involves maintaing temperature for three days, and then increasing the temperature as the Gravity Velocity slows down, and then again when the Gravity Velocity slows further, signalling that fermentation is nearly done. This type of profile can work (with slight variations) for nearly every yeast, and allows us to maintain optimum yeast health and activity for a fast but clean fermentation!

This Sample Auto Profile - Gravity Velocity Trigger can be downloaded to your RAPT account and can then be adjusted to suit if required. It illustatres how easy it is to have an automatic profile that suits almost every ale fermentation, and can easily be tweaked to suit lagers.

For more information about this and other features please watch this video.

NOTE: It is completely normal for there to be a temperature variance between the built in probe and the Bluetooth enabled RAPT device. This is because the Bluetooth device is measuring the temperature of the fermentation (typically), and the internal probe is measuring the air temperature of the RAPT Temperature Controller. This difference will be greater when the RAPT Temperature Controller is actively heating or cooling.

The Allowed Sensor Diff. Iin the Settings menu) sets the allowed temperature differential between the desired setpoint and the current temperature of the Fermentation Chamber. Cooling and Heating is disabled temporarily if this differential is exceeded. The default differential setting is 5°C. This value is suitable for typical use.

A note on Allowed Sensor Differential

This differential can be altered in the Settings menu. If the temperature differential is exceeded, the RAPT Temperature Controller will suspend heating and cooling until the differential is reduced. The legend DIFF OVERRIDE will also be displayed when the display is in Graph Disabled Mode.

The RAPT Temperature Controller will suspend active cooling or heating and resume as needed – no intervention is required. Once the differential is reduced then heating and cooling will continue as normal.

The Allowed Sensor Differential can be a powerful tool for temperature control. The default setting of 5°C is perfect for most use cases. However, you may choose to increase the differential to allow for more sustained and thus faster heating or cooling, for example. The Sensor Differential can be reduced as well - meaning that the a, which can be useful if there are large temperature swings during fermentation.llowed temperature swings in the chamber will be reduced.

Note that in most cases 5°C is appropriate, and too great a differential can causes issues such as freezing.

NOTE: When using a Bluetooth Bonded RAPT Pill Hydrometer as the temperature probe, it is important to place the RAPT Temperature Controller built in probe in the active fermentation chamber/fridge/freezer.