PX-Sens
Wireless temperature sensor specially designed for concrete temperature and curing monitoring. Measures concrete temperature from the same and different points with three thermocouple inputs. Also measures ambient temperature and humidity using a built-in sensor. After the thermocouple tips are directly embedded in concrete, it wirelessly transmits data to the PX-Gateway in real time.
Specifications
| Parameter | Specification |
|---|---|
| Thermocouple Inputs | 3× K-type Thermocouple channels (-200°C to +1250°C) |
| Ambient Sensor | Temperature (-40°C to +125°C) & Humidity (0–100% RH) |
| Operating Temp. Range | -20°C to +60°C |
| Connectivity | Bluetooth (BLE) + Wi-Fi |
| Accuracy | ±0.15% |
| Battery Life | 10 days |
| Battery Type | Rechargeable Li-Po, 3000 mAh |
| Charging | USB Type-C |
| IP Rating | TBD |
| Wireless Protocol | Encrypted wireless |
| Communication Range | ~1 km in open air |
| Offline Storage | Up to 20,000 records |
| External Material | Carbon fibre reinforced ASA |
| Dimensions | 195 × 97 × 30 mm |
| Weight | ~275g |
Connecting Thermocouple Probes
- Identify the connector - Each probe has a miniature thermocouple connector with + and - markings
- Align the connector - Match the polarization notch with the port
- Insert firmly - Push until you feel a click
- Verify connection - The app will show readings within 5 seconds
Always connect probes before powering on the device for the most reliable startup.
Probe Placement Guidelines
For accurate concrete core temperature measurement:
- Embed depth: Place probes at the geometric center of the concrete element
- Avoid edges: Keep probes at least 50mm from formwork surfaces
- Secure the probe: Use cable ties to prevent movement during pour
- Protect the cable: Route cables away from pour zones
Power Management
Power On
Press and hold the power button for 1 second. The firmware does not run a fixed “all LEDs cyan” startup sequence; indicators update as charging, Bluetooth, and other subsystems initialize (for example LED 2 may show charging state after the fuel-gauge first reports).
Power Off
Press and hold the power button for 3 seconds. All LEDs will blink orange to indicate shutdown pending.
If USB-C is still connected, the sensor may remain powered from USB even after a shutdown command. Unplug USB power if you need the device fully off.
Auto Power-Off
On a normal boot with no active recording session stored on the device, the firmware powers off after 5 minutes (300 seconds) of no Bluetooth connection (the timer pauses while BLE is connected so you can configure the device).
After you start a recording session, PX-Sens stays awake for about 30
seconds so it can capture the first readings and finish session startup. It
then switches to a 1-minute deep-sleep cycle between readings. If you wake
it with the power button while the session is still active, BLE is available
for 60 seconds so you can connect and stop the session. That window may
stay open a little longer if offline sync or OTA is still running. If the
session is still active when the window ends, the device returns to the
reading cycle. When the scheduled session end is reached, the sensor powers
off instead of staying awake.
Charging
- Connect USB-C cable to any 5V USB power source
- LED 2 shows orange breathing animation while charging
- LED 2 turns solid green (max brightness) when complete
- A success sound plays when charging completes
- Device can operate while charging
LED Indicators
These are the LED states that matter in normal use:
| What you see | Meaning |
|---|---|
LED 1 solid yellow | Sensor is powered on and idle |
LED 2 orange breathing | Battery is charging |
LED 2 solid green | Charging is complete |
LED 2 brief red pulse | Low-battery alert |
LED 3 solid blue | Connected to the mobile app over Bluetooth |
LED 3 slow dim blue blink | BLE is available for connection in some session-recovery flows |
| All LEDs blinking orange | Shutdown pending; release the power button to turn the sensor off |
Short flashes can occur during internal radio activity, but for normal operation the states above are the ones you need to watch.
Maintenance
Cleaning
- Wipe the enclosure with a damp cloth
- Do not use solvents or abrasive cleaners
- Ensure ports are dry before connecting cables
Probe Care
- Inspect probes regularly for damage
- Do not bend probe tips sharply
- Store probes coiled loosely (minimum 50mm diameter)
- Replace probes if readings become erratic
Storage
- Store in a dry location
- Charge to ~50% for long-term storage
- Avoid extreme temperatures
Troubleshooting
| Issue | Solution |
|---|---|
| Device won't power on | Charge for at least 30 minutes |
| No temperature reading | Check probe connection; try a different channel |
| Erratic readings | Replace thermocouple probe |
| Can't connect via Bluetooth | Power cycle the device; ensure app has Bluetooth permissions |
| LED 3 won't turn blue | Ensure Bluetooth is enabled on phone; restart app |
| LED 2 orange but never green | Check USB cable/charger; allow sufficient time for a full charge (3000 mAh battery) |
| Unexpected LED behavior | Power cycle the sensor and compare with the LED Indicators section above |