Disc Maxi
Bluetooth enabled sensor and data logger with alert functionality
Complete guide to using your Disc Maxi sensor
1. Welcome to the Disc Maxi
Congratulations on choosing the Disc Maxi by Blue Maestro! You now own a powerful and versatile Bluetooth Low Energy (BLE) data logger designed for precise environmental monitoring.
Please read this manual carefully before use and save for future reference.
Available Models
| Model | Type | APP ID | Sensors | Storage |
|---|---|---|---|---|
| disc-maxi-alerts-001 | Temp | 41 | Temperature | 100,000 |
| disc-maxi-alerts-003 | 3-in-1 | 42 | Temperature, Humidity, Dew Point | 50,000 |
| disc-maxi-alerts-004 | 4-in-1 | 43 | Temperature, Humidity, Dew Point, Barometric Pressure | 25,000 |
2. Important Safety Information
General Safety
- Keep the device away from children and pets
- Do not expose to open flames or extreme heat sources
- Do not immerse in water (device is splash-resistant, not waterproof)
- Do not attempt to open or modify the device
- Use only the recommended battery type for replacement
Battery Safety
- The device contains a CR2477 lithium metal coin cell battery
- Keep batteries away from children - if swallowed, seek immediate medical attention
- Do not attempt to recharge the battery
- Dispose of used batteries according to local regulations
- Do not expose batteries to extreme temperatures
Environmental Considerations
- Operating temperature (disc-maxi-alerts-001, 003): -45°C to +125°C (-49°F to +257°F)
- Operating temperature (disc-maxi-alerts-004): -40°C to +85°C (-40°F to +185°F)
- Do not use in corrosive or explosive atmospheres
- Avoid prolonged direct sunlight which may affect readings
- Allow the device to acclimatize when moving between extreme temperatures
3. Package Contents
Your Disc Maxi package should contain the following items:
1x Disc Maxi Device
Pre-installed with CR2477 battery
1x Lanyard
For hanging or attaching the device
1x Quick Start Guide
Getting started instructions
Missing Items?
If any items are missing or damaged, please contact us at support@bluemaestro.com
4. Getting Started: Device Overview
The Disc Maxi is a compact disc-shaped device (38mm/1.5" diameter x 14.9mm/0.59" tall) designed for easy placement and portability.
LED Indicator
Shows device status and alerts
Multi-function Button
Press to check status, hold to perform actions
Lanyard Hole
For attaching the included lanyard
Battery Compartment
Located on the back of the device
LED Indicator
The Disc Maxi has a single green LED indicator:
| LED Pattern | Meaning |
|---|---|
| Single green blink on startup | Device is operating normally |
| Continual green blinking | Device error - contact support |
5. Setting Up Your Disc Maxi
5.1 Installing the Blue Maestro 'bmLogger' App
The bmLogger app is required to configure your device and access logged data.
- Download the App
Search for "bmLogger" in the App Store (iOS) or Google Play Store (Android)
- Enable Bluetooth
Ensure Bluetooth is enabled on your smartphone
- Grant Permissions
Allow Bluetooth and Location permissions when prompted (Location is required for BLE scanning on Android)
5.2 Connecting Your Disc Maxi
- Open the bmLogger App
Launch the app and navigate to the Bluetooth tab
- Scan for Devices
The app will automatically scan for nearby devices. Your Disc Maxi should appear in the list.
- Identify Your Device
Look for a device named "Disc Maxi" or showing temperature readings. You can press the button on your device to make the LED blink.
- Tap to Connect
Select your device from the list to view details and access settings.
Connection Tips
- Ensure you are within 10 meters / 33 feet of the device
- Remove any obstructions between your phone and the device
- If the device doesn't appear, try pressing the button to wake it
- Make sure no other app is connected to the device
5.3 Device Configuration
After connecting, you can configure various settings:
Device Name
Assign a custom name (e.g., "Kitchen Fridge", "Server Room")
Logging Interval
Set how often readings are recorded (5 seconds to 1 hour)
Alert Thresholds
Configure high/low limits for each measurement type
Calibration
Fine-tune readings to match a reference instrument
6. Understanding Data Logging
How Logging Works
The Disc Maxi continuously monitors environmental conditions and stores readings in its internal memory. The device can store up to 100,000 data points, allowing for extended monitoring periods.
| Logging Interval | Approximate Duration |
|---|---|
| 5 seconds | ~5.8 days |
| 1 minute | ~69 days |
| 5 minutes | ~347 days |
| 15 minutes | ~2.8 years |
| 1 hour | ~11.4 years |
Memory Full Behavior
When memory is full, the device operates in circular buffer mode - oldest readings are overwritten with new data. Download data regularly to avoid losing historical records.
Logging Modes
Continuous Logging
Default mode. Records data at the set interval continuously until memory is full or device is reset.
Delayed Start
Configure the device to begin logging at a specific future time. Useful for cold chain monitoring.
7. Using the Blue Maestro 'bmLogger' App
The bmLogger app is used to configure your Disc Maxi, view live data, download logged readings, set alerts, and export data.
For complete instructions on using the bmLogger app, please refer to the bmLogger App Instruction Manual.
Key features available in the app:
- View real-time sensor readings
- Download and view logged data as graphs
- Configure logging intervals and device settings
- Set high/low threshold alerts
- Export data as CSV files
- Manage multiple devices
8. Battery Information & Replacement
Battery Specifications
- Battery Type: CR2477 Lithium Metal Coin Cell (3V)
- Expected Life: Up to 5 years (depending on logging interval and Bluetooth activity)
- Low Battery Warning: Displayed in the bmLogger app, or online through bmCloud (when implemented)
Replacing the Battery
- Download All Data First
Removing the battery will clear any unsaved data from the device memory
- Locate Battery Compartment
Turn the device over to find the battery cover on the back
- Open the Cover
Use a coin to twist the battery cover counter-clockwise
- Remove Old Battery
Carefully remove the old CR2477 battery
- Insert New Battery
Place a new CR2477 battery with the positive (+) side facing up
- Close the Cover
Replace the cover and twist clockwise to secure
- Reconfigure if Needed
The device will restart - you may need to reconfigure settings in the app
Important Battery Notes
- Use only CR2477 batteries from reputable manufacturers
- Dispose of used batteries responsibly according to local regulations
- Do not mix old and new batteries
- Do not attempt to recharge the battery
9. Product Specifications
For complete specifications for each model, please visit the product pages:
disc-maxi-alerts-001
Temperature Only (Temp) - View Full Specs
disc-maxi-alerts-003
3-in-1 (Temp, Humidity, Dew Point) - View Full Specs
disc-maxi-alerts-004
4-in-1 (Temp, Humidity, Dew Point, Barometric Pressure) - View Full Specs
Sensor Information by Model
| Model | Sensor | Manufacturer | Datasheet |
|---|---|---|---|
| disc-maxi-alerts-001 | STS4x Temperature Sensor | Sensirion | View Specs |
| disc-maxi-alerts-003 | SHT4x Temperature/Humidity Sensor | Sensirion | View Specs (PDF) |
| disc-maxi-alerts-004 | BME280 Environmental Sensor | Bosch Sensortec | View Specs (PDF) |
10. Troubleshooting
Device Not Appearing in App
Check Bluetooth
Ensure Bluetooth is enabled on your phone. Try toggling it off and on.
Check Proximity
Move closer to the device. It should be within 10 meters / 33 feet.
Press the Button
Press the device button to wake it and confirm it's working (LED should blink).
Check Battery
If no LED response, the battery may be depleted. Replace with a new CR2477.
Inaccurate Readings
Allow Acclimatization
When moving the device to a new environment, allow 15-30 minutes for accurate readings.
Calibrate the Device
Use the calibration feature in the app to adjust readings against a reference instrument.
Check Placement
Avoid direct sunlight, heat sources, or placing the device on surfaces that may affect readings.
Download Failing
Maintain Connection
Stay close to the device during download. Don't move away or let the phone sleep.
Retry the Download
If download fails, close and reopen the app, then try again.
Close Other Apps
Close other Bluetooth-using apps that may interfere with the connection.
LED Not Responding
Replace Battery
The battery is likely depleted. Replace with a new CR2477 battery.
11. Warranty & Support
Warranty Coverage
Blue Maestro warrants this product against defects in materials and workmanship for a period of 12 months from the date of purchase.
What's Covered
- Manufacturing defects
- Component failure under normal use
- Firmware issues
What's Not Covered
- Damage from misuse, accidents, or neglect
- Water damage beyond IP54 rating
- Battery replacement
- Normal wear and tear
- Unauthorized modifications
Making a Warranty Claim
To make a warranty claim, please contact us with:
- Proof of purchase (receipt or order confirmation)
- Device serial number (shown in the app)
- Description of the issue
Need Help?
For additional support with your Disc Maxi or other Blue Maestro products: