Customize
Spark WL-50 Tank Level Monitor: The tank level. On your wall.
An ultrasonic sensor on the tank sends the level by LoRa radio to a colour display in the house. The display joins your Wi-Fi, so you see the same level in the Tuya Smart app. It sounds an alarm and can run the pump for you.
Sensor on the tank. Screen in the house.
The tank-top sensor measures without touching the liquid and sends the reading to the display by LoRa radio. The display shows level, depth and room temperature, and shares them with Tuya Smart over 2.4 GHz Wi-Fi.
- Ultrasound: Contact-free measuring at the tank.
- LoRa radio: The wireless link between sensor and display.
- Wi-Fi app access: The display needs 2.4 GHz Wi-Fi; 5 GHz is not supported.
Everything about the tank at a glance.
See the tank graphic, percentage, water depth in centimetres, room temperature and LoRa/Wi-Fi link icons. Above 99%, the level reads FU. Select always-on display or off after 15 seconds, and adjust brightness with plus and minus.
- Five keys: Display mode, settings, mode, plus and minus.
- Saved settings: Installation and level settings remain after a power cut.
- Link check: Depth flashes after 30 seconds if the LoRa link drops.
Set the limits. Let the monitor respond.
Set Max and Min on the display or in the app; the settings stay in sync. The buzzer sounds above Max or below Min. Automatic pump control starts below Min and stops at Max minus 5 percentage points: Max 60% stops at 55%.
- Buzzer: Stops when the level returns to range; press any key to mute.
- Pump start: Below the Min level.
- Pump stop: At Max minus 5 percentage points.
- App settings: Max, Min, installation height and sensor-to-full-line distance.
Screw it into the lid. Pair it once.
Cut a hole of about 58 mm and mount the sensor centrally, away from the inlet and tank wall. Keep the liquid at least 0.1 m below the sensor. The maximum installation height is 5 m. Pair sensor and display with their buttons, then add the display to Tuya Smart using Bluetooth and 2.4 GHz Wi-Fi.
- Installation height: Sensor to tank bottom, up to 5 m; display steps are 5 cm.
- Sensor to full line: At least 0.1 m.
- Clear beam: Avoid tilted surfaces, small objects and foam under the sensor.
Specifications
| Model | Spark WL-50 |
| Kit | Ultrasonic sensor + LCD display |
| Sensor to display | LoRa radio |
| Display to home | Wi-Fi 2.4 GHz · Tuya Smart / Smart Life |
| Measuring range | 10 cm – 5 m |
| Blind zone | < 10 cm |
| Accuracy | ±(1 % of reading + 10 mm) at 20 °C |
| Ultrasonic frequency | 40 kHz |
| Detection angle | Horizontal 1.7° · vertical 12–29° |
| Detection cycle | ≥ 1 s |
| Power supply | DC 5 V |
| Current | < 150 mA |
| Operating temperature | −10 to 70 °C |
| Sensor cable | 3 m, waterproof DC2.0 connector |
| Power adapters | 5 V, 1.5 m cable |
| Mounting hole | About 58 mm |
| Alarm, pump and display | |
|---|---|
| High/low thresholds | Max and Min; display and app stay in sync |
| Pump starts | Below Min |
| Pump stops | At Max minus 5 percentage points |
| Display sleep | Always on or off after 15 s |
| LoRa disconnection indication | Depth flashes after 30 s |
| Installation-height steps | 5 cm on the display |
| Full level indication | FU above 99% |
In the box
- WL-50 colour LCD display with antenna, buzzer and five keys
- WL-50 ultrasonic sensor with antenna and 3 m cable
- Two 5 V power adapters, one for the display and one for the sensor
