RAPT Bluetooth Thermometer | Bluetooth Operation
To use the Bluetooth functionality of the RAPT Bluetooth Thermometer you will need to Bond it via Bluetooth to a RAPT Temperature Controller, RAPT Fermentation Chamber or Gen 4 BrewZilla Controller. Follow the steps below to bond your RAPT Bluetooth Thermometer to a RAPT enabled device:
Bluetooth needs to first be enabled in the Settings menu. Use the Up or Down buttons to scroll to select the Settings menu. Scroll to Bluetooth and choose Select button to Enable Bluetooth, or the Return button to cancel if Bluetooth is already enabled.
To Bond a RAPT Bluetooth Thermometers, use the Up or Down buttons to scroll to select the device - displayed as RAPT Temp [Temperature]. Choose Select button to Bond the device, or the Return button to cancel.
Once Bonded, the device will be visible in the Bonded section of the Bluetooth Menu. To Unbond, select the device with the navigation arrows and choose Select buttont to Unbond the device, or the Return button to cancel.
You can successfully bond multiple RAPT Bluetooth Thermometers with your RAPT enabled controller in this way. Each RAPT Bluetooth Thermometer has a unique MAC address which is displayed in the Bluetooth settings when the thermometer is powered on.
The RAPT Bluetooth Thermometer can be set as the controlling temperature sensor of your RAPT Controller. To set the RAPT Bluetooth Thermometer as the controlling temperature sensor follow the instructions below.
to your RAPT Temperature Controller, RAPT Fermentation Chamber or Gen 4 BrewZilla Controller
Use the Up or Down buttons to scroll to select the Settings menu on the RAPT Temperature Controller, RAPT Fermentation Chamber or Gen 4 BrewZilla Controller
Select Temperature Sensor and choose Select . Use the Up or Down buttons to scroll through the available Bluetooth Bonded devices untilthe desired RAPT Bluetooth Thermometer is selected. Choose Select to confirm the setting of the RAPT Bluetooth Thermometer as the controlling temperature sensor
Once you have set the RAPT Bluetooth Thermometer as the controller temperature sensor your RAPT Temperature Controller, RAPT Fermentation Chamber or Gen 4 BrewZilla will then cycle the heating or cooling (if applicable) on, according to the temperature measured by the RAPT Bluetooth Thermometer and not by the built-in probe on the RAPT Controller or BrewZilla.
The RAPT Bluetooth Thermometer can be utilised to achieve a more accurate mash temperature during your brew day.
To really nail your mash temperature, measure the core temperature of the mash and set the RAPT Bluetooth Thermometer to be the controlling temperature sensor for the BrewZilla.
When the RAPT Bluetooth Thermometer is set as the controlling temperature sensor the elements will turn On/Off when required based on the set temperature on the controller and the temperature measured by the RAPT Bluetooth Thermometer within the core of the mash.
This allows a more accurate mash temperature to be maintained and meaning you can nail your recipe, increase the response time for a step mash or mash out and improve efficiency.
Bond the RAPT Bluetooth Thermometer to your BrewZilla Controller
Set the RAPT Bluetooth Thermometer as the controlling temperature sensor
Set your required mash temperature, Sensor Differential and Power on your BrewZilla controller
Insert the probe of the RAPT Bluetooth Thermometer into your mash. IMPORTANT: Use the included top screen to hold the probe in the correct position
For a comprehensive guide to using your RAPT Bluetooth Thermometer with a RAPT Gen 4 BrewZilla, please refer to and also
The RAPT Bluetooth Thermometer is also a useful tool for monitoring the head temperature of your distillation apparatus and subsequently controlling your boiler based on the temperature in the still head and automating the overall distillation process.
To achieve this simply insert the probe into the thermowell in your distillation apparatus. Then bond your RAPT Bluetooth Thermometer with your Gen 4 BrewZilla and set the thermometer to be the controlling temperature sensor.
Adjust the set temperature of the Gen 4 BrewZilla to be when you want the distillation to end (for example the temperature that you expect to begin collecting tails). Then once the temperature in the still head hits this shut off temperature the BrewZilla will then turn off the heating elements until the temperature drops below the hysteresis value set on your BrewZilla.
You may need to adjust the Allowed Sensor Diff. setting in the BrewZilla controller to ensure that the wash in your boiler continues boiling throughout the distillation process.
The Allowed Sensor Diff. setting in the RAPT Controller is the maximum deviation (differential) from the set point temperature that the built-in temperature probe of the bonded RAPT enabled device is allowed to reach before the heating/cooling is turned off to prevent excessive temperature over/undershoot.
The heating/cooling of the RAPT Controller will then turn back on based on the hysteresis settings of the controller to increase or decrease the measured temperature until it reaches the desired set point.
Thus, with a set point temperature of 65°C, and an Allowed Sensor Diff of 5°C (using typical mash temperatures on a BrewZilla as an example), the elements will operate up to 70°C - which is 5°C above the set point.
However, the elements will shut off when the RAPT Bluetooth Thermometer reaches the set point temperature of 65°C
As a guide, setting a smaller Allowed Sensor Diff for mainating temperature and a larger Allowed Sensor Diff for increasing the temperature of the mash is a good approach. Refer to and also for more information.
More detailed information regarding how the Allowed Sensor Diff. setting works can be found in the video below
RAPT Bluetooth Thermometer | Assembly & Set Up
Do not install the batteries in the incorrect orientation
Only clean the probe with recommended cleaners and sanitisers including: StellarClean, StellarOxy, StellarSan and Super Kill Ethyl Sanitiser Spray
Do not use any non-approved probes with this Bluetooth thermometer
Changes or modifications to this unit which are not approved by KegLand may result in warranty being void
To power the device ON/OFF, hold down the button for at least 3 seconds.
Plug the probe into the 3.5mm female jack on the RAPT Bluetooth Thermometer.
When the temperature probe is plugged into the device the display will show the temperature measured by the probe.
If three dashes are shown on the display then this means that the temperature probe may be unplugged or faulty.
Install the batteries and temperature probe and remove the black plastic tip on the probe before use
Bond the device with your RAPT Temperature Controller, RAPT Fermentation Chamber Controller or Gen 4 BrewZilla. Bonding instructions are shown below
Submerge the temperature probe into the liquid you wish to measure. The temperature measured by your RAPT Bluetooth thermometer will then automatically transmit to your bonded device
Set the RAPT Bluetooth Thermometer to be the controlling temperature sensor for your BrewZilla or RAPT Temperature Controller or Fermentation Chamber
Sleep Mode - Gen 1 only. The device will enter “Sleep Mode” after 10 minutes of inactivity. While in sleep mode BLE will be shown on the display to conserve battery. While in Sleep Mode the device will still transmit data via Bluetooth to any bonded devices.
Press the button to wake the device up and show the measured temperature on the display.
Gen 2 units will display the current temperature until the has been met.
RAPT Bluetooth Thermometer | Settings
Turn the unit on by holding the power button for 3 seconds. Unplug the temperature probe male jack from the top of the unit. The unit will display OPn
Double Press the button until C or F shows. Press again to change. Plug in the probe
Ensure the probe is inserted into the unit. Turn the unit on
Double press the button until the screen flashes with an H in the corner.
The range for the Auto Off Timer is 1 hour to 99 hours. Selecting "--" will disable the Auto Off TImer.
Continually press the power button until the desired Auto Off Timer value is displayed. Double click the button or wait for the display to revery to save the new setting.
Note: Pressing the button will change in delay in increments of 1 hour. Holding the button will change the delay in 5 hour increments.
The device will enter “Sleep Mode” after 10 minutes of inactivity. While in sleep mode BLE will be shown on the display to conserve battery. While in Sleep Mode the device will still transmit data via Bluetooth to any bonded devices.
Press the button to wake the device up and show the measured temperature on the display.
Gen 2 units will display the current temperature until the auto-off timer has been met.
Turn the unit on by holding the power button for 3 seconds. Ensure the probe is plugged in.
Press and hold the power button for 10 sconds until the display changes to flashing 0.0°C
Note: While holding the button, the unit will show OFF. Ignore this. Keep holding the button.
When the display is flashing 0.0°C, release the button. The Temperature Offset can then be changed in 0.1°C increments from -5°C to +5°C (or °F, if Fahrenheit is selected). This changes the offset of the displayed temperature to allow calibration of the unit.
When +5°C has been reached the unit will cycle to -5°C.
If no button input is received for 1 second, the unit will turn off and the currently displayed offset will be saved.
A positve offset increases the displayed temperature, and a negative offset decreases the displayed temperature.
Thus if the temperature before calibration is displayed as 20°C and we set an offset of +4°C, the display will read 24°C after calibration.
Calibration is persistent and wil remain after turning the device off or changing the batteries.
To rest the calibration offset to the default value of 0°C simply press and hold the power button for 10 sconds until the display changes to flashing 0.0°C. Wait until the device turns off (approx 3 seconds). The calibration offset has been restored to default.
Opn - Temperature Probe not plugged in or faulty
Hi - Temperature reading higher than 300°C (or faulty/damaged temp probe)
Lo - Temperature reading lower than -20°C (or faulty/damaged temp probe)
Sht - Probe faulty or short circuit
KL24334 RAPT Bluetooth Thermometer | User Guide
This low energy RAPT enabled Bluetooth Thermometer is compatible with the Gen 4 BrewZillas, RAPT Temperature Controllers and RAPT Fermentation Chambers
The RAPT Bluetooth Thermometer is compatible with Gen 4 BrewZilla’s, RAPT Temperature Controllers and RAPT Fermentation Chambers allowing you to make smarter and more automated decisions on how to control the brewing or distillation process. The RAPT Bluetooth Thermometer is able to perform many functions when bonded with a RAPT controller including, but not limited to:
Measuring core grain temperature of your BrewZilla to more accurately control the heating elements according to the mash temperature
Measuring still head temperature and controlling the BrewZilla to turn the elements off once your target temperature is hit and your distillation run is over
Measuring core fermentation temperature and controlling your RAPT Fermentation Chamber or RAPT Temperature Controller heating and cooling
The RAPT Bluetooth Thermometer will not work without one or more of the devices listed above.
