1. Product Overview
The RAPT Pill is an advanced digital hydrometer and thermometer designed for accurate and precise, true real-time specific gravity and temperature logging. It integrates seamlessly via WiFi and Bluetooth with the RAPT Fermentation Chamber or RAPT Temperature Controller, as well as the RAPT mobile app or RAPT IOT platform. This device allows for instant gravity and temperature measurements, logging data directly from inside your fermenter during the fermentation process.
The RAPT Pill offers several advantages over other wireless hydrometers, including a robust design, enhanced ergonomics, and a sanitary construction. Its design makes it less susceptible to measurement errors caused by hops, krausen, or CO2 bubbles generated during fermentation.
2. Setup and Initial Configuration
2.1 Initial Charging and Firmware Update
Before first use, ensure the RAPT Pill is charged for 24 hours. This step is crucial for a full charge and proper battery calibration. Once connected via USB-C and to a WiFi network, the firmware will automatically update to the latest version if needed. The Pill must be plugged in via USB-C and connected to a 2.4gHz WiFi network to receive firmware updates.
2.2 App Download
The RAPT web wrapper application assists in rendering the app.rap.io webpage on your mobile device and enables push notifications.
- Google Play (Android): https://play.google.com/store/apps/details?id=io.rapt
- Apple App Store (iOS): https://apps.apple.com/th/app/rapt/id1573192994
2.3 Housing Assembly and Calibration
The RAPT Pill's housing is designed for ease of use, separating into two pieces at the midline rather than requiring an end cap to be unscrewed. It features a double o-ring seal for a water-tight connection and reduced risk of infection.
Each time the housing is opened and closed, the tightness may vary. It is recommended to mark the housing to ensure consistent reassembly tightness or to re-calibrate the device after each opening to maintain accuracy.
3. Operation
3.1 Real-time Logging
The RAPT Pill functions as both a real-time gravity testing hydrometer and thermometer. It provides instant gravity and temperature measurements and logs this data directly from inside your fermenter throughout the fermentation process.
3.2 Connectivity Modes: WiFi and Bluetooth Bridge
The RAPT Pill supports both WiFi and Bluetooth connectivity. While WiFi mode is standard, using the Pill in Bluetooth bridge mode offers several advantages:
- Power Efficiency: Bluetooth is more power-efficient, extending battery life. The Pill sends low-energy Bluetooth beacons, and a mains-powered bridge device (e.g., RAPT Fermentation Chamber or RAPT Temperature Controller) transfers data to the RAPT web portal.
- Signal Penetration: Bluetooth signals are better at penetrating fermenters, especially stainless steel ones or those inside fridges/fermentation chambers.
- Core Fermenter Temperature: In Bluetooth bridge mode, the Pill Hydrometer can act as a temperature probe, providing accurate core fermenter temperature without needing a thermowell. The onboard digital temperature sensor is highly accurate. Note: After charging or using AP mode, allow 30 minutes for the battery temperature to stabilize for accurate readings.
- Fermentation Control: Bluetooth connectivity enables advanced fermentation control, utilizing gravity and gravity acceleration to set automatic and precise fermentation parameters.
To use Bluetooth bridge mode, pair the RAPT Pill with a compatible RAPT Bluetooth-enabled device such as a RAPT Fermentation Chamber (KL15813) or a RAPT Temperature Controller (KL22927).
3.3 RAPT IOT Hub
The RAPT IOT Hub is a complimentary service that allows any RAPT-enabled product to log and store data, which can be conveniently accessed. The hub also enables remote control of your devices, providing control regardless of your location. The RAPT portal supports creating complex temperature profiles for a set-and-forget experience and manages alert/notification processes, sending email notifications if issues arise. There is no limit to the number of RAPT devices you can connect to the RAPT IOT Hub.
3.4 Battery Life and Telemetry Frequency
The RAPT Pill offers extended battery life. When utilizing WiFi, it can last approximately 5 months between charges. In Bluetooth-only mode, the battery can last over 2 years before requiring a recharge. The device features a USB-C charging port on its circuit board for fast charging.
Estimated battery life based on telemetry frequency:
- 60-minute telemetry frequency: Approximately 1.5 years
- 30-minute telemetry frequency: Approximately 9.5 months
- 15-minute telemetry frequency: Approximately 5 months
The default telemetry frequency is 60 minutes, so out of the box, the battery should last approximately 1.5 years.
4. Maintenance
4.1 Charging
The RAPT Pill is equipped with a USB-C charging port on its circuit board. For convenience and to maintain measurement accuracy, consider purchasing the optional wireless charging kit (KL31936). This allows charging without opening the housing, reducing the need for frequent re-calibration.
4.2 Cleaning
The sanitary design of the RAPT Pill, with its double o-ring seal and no exposed threads, facilitates easy cleaning. While the larger housing is less prone to krausen or hop accumulation affecting readings, regular cleaning of the exterior is recommended to prevent buildup and maintain hygiene.
4.3 Battery Information
The RAPT Pill uses a Li-Ion 18650 battery, specifically the EVE Brand, Model: EVE-INR18650/33V. For detailed specifications and safety information regarding the battery, please refer to the EVE-INR18650/33V Specification Sheet PDF.
4.4 Storage
For optimal performance and longevity, store the RAPT Pill within the following temperature ranges:
- Up to 1 year: 0°C to 25°C
- Up to 3 months: 0°C to 45°C
- Up to 1 month: 0°C to 60°C
For long-term storage (3 months or more), it is strongly recommended to perform one charge/discharge cycle. The battery voltage should be between 3.50V and 3.80V. Store the device in a low-temperature environment (ideally 0°C to 25°C), ensuring it is dry and free from corrosive gases.
5. Troubleshooting
5.1 Accuracy Issues
Accuracy can be affected if solids such as hops or krausen adhere to the exterior of the hydrometer. Gently shaking the fermenter periodically can help dislodge these particles, allowing them to settle and ensuring more accurate gravity readings.
5.2 Temperature Reading Discrepancies
If the RAPT Pill has just been charged or was recently in Access Point (AP) mode, the battery may generate excessive heat, temporarily affecting temperature readings. Wait approximately 30 minutes after these activities for the battery temperature to reach equilibrium before taking critical temperature measurements.
5.3 Firmware Update Problems
Ensure the RAPT Pill is plugged in via its USB-C port and connected to a 2.4gHz WiFi network to receive firmware updates. Verify your network is 2.4gHz and the connection is stable.
5.4 Signal Strength
If experiencing weak WiFi signals, particularly with stainless steel fermenters or when the device is inside a fridge or fermentation chamber, consider utilizing the Bluetooth bridge mode. Bluetooth signals generally offer better penetration through such materials, improving connectivity and data transmission.
5.5 General Cautions
The battery in this device, if mishandled, poses a risk of fire or chemical burn. Observe the following precautions:
- Do not disassemble the device or modify the cell.
- Do not expose the cell to temperatures above 100°C or incinerate it.
- Avoid exposing the cell to extreme heat or open flames.
- Do not short-circuit, over-charge, or over-discharge the cell.
- Do not subject the cell to strong mechanical shocks.
- Do not immerse the cell in water or seawater, or allow it to get wet.
- Do not reverse the polarity of the cell for any reason.
- Do not handle or store the device with metallic objects like necklaces, coins, or hairpins.
- Do not use the cell if it shows conspicuous damage or deformation.
- Do not connect the cell directly to a plug socket or car-cigarette-plug.
- Do not attempt direct soldering onto a cell.
- Do not touch a leaked cell directly.
- Do not mix different types of Lithium-ion cells or cells from different manufacturers.
- Do not use or leave the cell under direct sunlight or in a heated car.
- Keep the cell away from children.
- Do not drive a nail into the cell, strike it with a hammer, or tread on it.
- Replace batteries only with those specified by EVE.
6. Specifications
| Feature | Specification |
|---|---|
| Specific Gravity Accuracy | +/- 0.002 SG points |
| Temperature Range | -20°C (-4°F) to 60°C (140°F) |
| Pressure Range | 0-5 bar |
| Battery Type | Li-Ion 18650 (EVE Brand, Model: EVE-INR18650/33V) |
| Battery Typical Discharge Capacity | 3200mAh |
| Battery Minimum Discharge Capacity | 3100mAh |
| Battery Typical Voltage | 3.60V |
| Battery Max. Continuous Discharge | 10A |
| Battery Charge/Discharge Voltage Range | 4.20V ~ 2.50V |
| Battery Cell Weight | 44.5 ± 2.0g |
| Battery Cell Dimensions (Height x Diameter) | 65.00 ± 0.15mm x 18.35 ± 0.10mm |
| Product Dimensions (Diameter x Length) | 37mm x 125mm |
| Temperature Accuracy | +/- 0.2°C (0.36°F) |
| Housing Materials | BPA Free Nylon 12 and Polyketone (POK) |
| Package Weight | 0.18 kg |
| Package Dimensions (Length x Width x Height) | 15 cm x 10 cm x 4 cm |
7. User Tips
- Carboy Compatibility: The RAPT Pill measures 37mm in diameter and 125mm in length. Before use, measure the opening of your carboy or fermenter to ensure the device will fit.
- Consistent Calibration: To maintain optimal accuracy, it is advisable to mark the two halves of the RAPT Pill's housing. This ensures you reassemble them with consistent tightness after opening for charging or maintenance. Alternatively, re-calibrate the device after each opening.
- Wireless Charging for Accuracy: Consider purchasing the optional wireless charging kit (KL31936). This allows you to charge the RAPT Pill without opening its housing, which helps preserve calibration and accuracy over time.
- Accurate Temperature Readings: After charging or operating in Access Point (AP) mode, the battery may generate some heat. For the most precise temperature measurements, wait approximately 30 minutes for the battery to cool and stabilize.
- Gravity Reading Maintenance: If you notice solids like hops or krausen accumulating on the hydrometer, gently shaking your fermenter can help dislodge them. This action ensures that the device is free from obstructions that could affect gravity measurement accuracy.
- Optimize Signal Strength: If you experience weak WiFi signals, especially when fermenting in stainless steel vessels or within a fridge/fermentation chamber, switch to Bluetooth bridge mode. Pairing the RAPT Pill with a compatible RAPT device (e.g., RAPT Fermentation Chamber or RAPT Temperature Controller) can significantly improve signal penetration and overall connectivity.
8. Warranty and Support
8.1 Warranty Information
The warranty period for the battery cells is determined by the specific business contract. EVE Energy Co., Ltd. will not provide free replacements for cells if problems arise from customer abuse, misuse, or issues not directly attributable to manufacturing defects. The warranty does not cover issues caused by improper matching of electric circuits, cell packs, or chargers. Furthermore, any defects found after the assembly acceptance of the cells are exempt from warranty coverage.
8.2 Manufacturer Support (for EVE Battery)
For inquiries or support related to the EVE-INR18650/33V battery, you may contact EVE Energy Co., Ltd. directly:
- Address: EVE Industrial Park on No.38, Huifeng 7th Road, Zhongkai Hi-Tech Zone, Huizhou.
- Telephone: 86-752-2630809
- Fax: 86-752-2606033
- Website: http://www.evebattery.com.cn