AQXWIE02 -- Leak Protection & Water Consumption Monitor (WLAN)
Product Description
The AQXWIE02 detects water consumption and water leaks by analyzing pressure waves in the water supply. It continuously monitors pressure, temperature, and water consumption multiple times per second. A single sensor is sufficient for an entire building, as water transmits acoustic signals excellently.
The device consists of a main unit (IP65) for signal processing and wireless communication, and an external sensor head (IP67) with connection to the water supply network. Communication takes place via WLAN to the Aqua-Scope Cloud app, via MQTT, or as JSON to smart home gateways.
Compared to the AQSWIE02, the AQXWIE02 offers:
- Water consumption measurement via acoustic pressure wave analysis
- Additional alarms (prolonged flow, stuck toilet, dripping faucet, strange flow)
- Automatic 24-hour calibration
- Sensitivity: <250 ml/min with pressure reducer, <2000 ml/min without
Key Features:
- Pressure wave analysis: leak detection + consumption measurement
- External sensor head with G1/4" connection
- T-piece for 3/8" angle valves included
- Wired flood sensor (3.5 mm jack socket)
- Retrofit motor support via LoRa (auto shut-off)
- Up to 10 wireless flood sensors
- App + MQTT + JSON Webhook
- USB-C (5V/1A) or ER26500 battery
- IP65 (main unit) / IP67 (sensor head)
Installation
The sensor head has a G1/4" thread (European metric) and therefore fits all test ports in the water supply network, e.g., on backflow preventers, main shut-off valves, or pressure reducers.
Installation at a Test Port
Screw the sensor head directly into an existing 1/4" test port.
Installation at an Angle Valve
If no test port is available, the sensor head can be installed at an angle valve:
- Shut off the water at the angle valve
- Loosen the braided hose at the angle valve using the included 3/8" open-end wrench
- Insert the included T-piece between the angle valve and the braided hose
- Reattach the braided hose to the T-piece
- Screw the sensor head into the outlet of the T-piece
- Turn the water back on and check all connections for leaks
When reattaching the braided hose, always brace the braided hose to prevent it from twisting. A twisted braided hose can lead to leaks!
The sensor head must always be installed after any existing pressure reducer. The pressure reducer significantly improves the accuracy of the consumption measurement.
Connection and Communication
The WLAN setup is performed via the device's configuration page (SSID "Scope"). A detailed step-by-step guide can be found at WLAN Connection.
For Advanced Users
In addition to the Aqua-Scope app, further communication options are available and can be activated via Configuration -> Communication Options in the app:
- MQTT -- Integration into MQTT-based systems
- Home Assistant -- Automatic discovery in the dashboard
- JSON Webhook -- Custom web service with HTTP POST
- Modbus IP -- Industrial protocol (TCP Port 502)
- Local Web Server -- Direct access via browser on the LAN
The local web server and Modbus IP are only available in mains-powered mode, not in battery mode.
Device Usage
Hardware
- USB-C Port: For power supply only (included KTEC power adapter recommended -- cheaper alternatives may cause interference that affects sensor quality). Waterproof connector.
- External Sensor Head: Waterproof threaded connection to the main unit (80 cm cable)
- 3.5 mm Jack Socket: Waterproof connection for an additional external flood sensor (included)
- Battery Compartment (rear): Screw cap with rubber seal for water protection
Button Operation
| Action | Function |
|---|---|
| Press once briefly | Wake up / send status report |
| Press twice briefly | Acknowledge active alarm |
| Press three times briefly | Currently not assigned |
| Hold for 5 sec. (immediately after power-on) | Factory reset |
LED Indicators
| LED | Meaning |
|---|---|
| Yellow/multicolor blinking | Boot process |
| Red/green blinking | Factory state -- ready to connect, web server and Bluetooth active |
| Blue or green slowly breathing | Network and external power connected, normal/standby operation |
| Red blinking | Active alarm with external power |
| Off | Not connected or battery mode (sleep mode) |
Measurements and Alarms
The device measures water pressure, temperature, and consumption multiple times per second and transmits the data every 15 minutes via WLAN.
10 alarm types (3 additional compared to AQSWIE02):
| Alarm Type | Mask | Description |
|---|---|---|
| 1 -- Flood Sensor | 0x001 | Wired or wireless sensor detects water |
| 3 -- Prolonged Flow | 0x004 | Water flows for too long (Parameter 10, default: 900 sec. = ~15 min.) |
| 4 -- Underpressure | 0x008 | Water pressure below lower threshold (Parameter 7) |
| 5 -- Stuck Toilet | 0x010 | Persistent minimal flow detected |
| 6 -- Overpressure | 0x020 | Water pressure above upper threshold (Parameter 6) |
| 7 -- Dripping Faucet | 0x040 | Dripping faucet detected |
| 8 -- Pipe Check Micro-Leak | 0x080 | Pipe check detected a micro-leak |
| 10 -- Strange Flow | 0x200 | Unusual flow pattern detected |
| 14 -- Sensor Not Connected | 0x2000 | Sensor head disconnected from main unit |
| 15 -- Sensor Not in Water | 0x4000 | Sensor head connected but no contact with pressurized water |
Calibration
To correctly evaluate the acoustic signals in the water, the sensor must be calibrated. This happens automatically within approximately 24 hours after connecting to the wireless network. During this time, consumption values may be inaccurate, especially if the water pressure fluctuates significantly.
The automatic calibration requires up to 24 hours. During this time, consumption values may be inaccurate. The calibration can be restarted at any time via the app or by pressing the button (3x click).
Effect of a Pressure Reducer
| Function | With Pressure Reducer | Without Pressure Reducer |
|---|---|---|
| Pressure monitoring | Full functionality | Full functionality |
| Temperature monitoring | Full functionality | Full functionality |
| Flood sensor alarm | Full functionality | Full functionality |
| Frost alarm | Full functionality | Full functionality |
| Overpressure alarm | Full functionality | Full functionality |
| Pipe check (micro-leak) | Full functionality | Full functionality |
| Consumption alarm | Limited precision | Limited precision |
| Consumption measurement | Sensitivity <250 ml/min | Sensitivity <2000 ml/min |
| Stuck toilet | Limited precision | Limited precision |
Communication with External Devices
- Retrofit Motors: Pairing via LoRa (internal), QR code pairing via the app
- OPEN/CLOSE Control: via app or alarm automation
- Timer: time-controlled shut-off
- Flood Sensors: up to 9 wireless sensors (FLOLWE02)
Pipe Check
The pipe check detects micro-leaks in the water system. To do this, the motor shuts off the water for approx. 240 seconds and the pressure change in the water system is analyzed. Temperature fluctuations, outgassing, and also micro-leaks affect the measurement.
The sensitivity is very high -- a leak is detected from approx. 1 drop per second (sensitivity: <4 ml/hour). The sensitivity can be adjusted in the app.
The threshold must be set higher if a larger hot water tank (boiler) is present, as the thermal expansion of the water affects the pressure measurement.
Alarm Behavior: In the factory settings, only the 5th consecutive alarm leads to an actual notification of the user. This value can be changed in the app from 0 (alarm immediately) to 10.
Manual and Automatic Pipe Check:
The pipe check can be manually started in the app. A regular automatic execution is recommended via a timed action in the app (freely selectable time of day and days of the week).
A retrofit motor (e.g., BVSLWE02 or KFRLWE02) is required for the pipe check to automatically shut off the water before the test.
Battery Operation
The device is powered by an ER26500 battery (bobbin cell, size C, lithium thionyl chloride), which is inserted in the battery compartment on the back.
- Battery life: 8--10 years with pressure reducer, approx. 4 years without
- The battery can also serve as a backup alongside mains power (USB-C)
- The power source at startup determines the operating mode
In pure battery mode:
- LEDs on the device are disabled (status LED remains dark)
- No acoustic or visual local alarm indication
- Slow command processing (up to 1 hour instead of ~10 seconds in mains mode)
- Cannot receive alarms from external wireless flood sensors
- Sensor data is transmitted hourly instead of every 15 minutes
- LoRaWAN devices attempt JOIN only once
Configuration Parameters
| No. | Parameter | Default | Description |
|---|---|---|---|
| 4 | Valve motor action | -- | Bitmap: defines which alarm types trigger motor shut-off |
| 5 | Nominal pressure | -- | Informational: set pressure of the pressure reducer (mBar) |
| 6 | Overpressure threshold | 8000 mBar | Alarm when exceeded |
| 7 | Underpressure threshold | 1 mBar | Alarm when undershot |
| 8 | Consumption conversion | 1000 | Conversion factor speed to liters |
| 10 | Prolonged flow threshold | 900 s | Flow duration that triggers an alarm (~15 min.) |
| 13 | Pipe check duration | 240 s | Test duration for micro-leak detection |
| 14 | Pipe check abort | 200 mBar | Single pressure increase that aborts the test |
| 15 | Pipe check alarm | 30 mBar | Pressure drop threshold for leak detection |
| 18 | Temperature sensor offset | 0 | Linear offset in 1/10 °C |
Sensor Values (Uplink)
| Index | Modbus Register | Measurement | Unit |
|---|---|---|---|
| 0 | 100/101 | Uptime | Hours |
| 1 | 102/103 | Temperature | 1/10 °C |
| 2 | 104/105 | Battery voltage | mV |
| 3 | 106/107 | Battery consumption | mAs |
| 4 | 108/109 | Water pressure | mBar |
| 5 | 110/111 | Water consumption since last query | ml |
| 6 | 112/113 | Water meter reading | Liters |
| 7 | 114/115 | Valve status | 1=open, 0=closed |
Scope of Delivery
- Leak protection monitor (main unit, without battery)
- Aqua-Scope sensor head with 80 cm cable
- 3/8" T-piece for angle valve installation
- Flood sensor with 130 cm cable and jack plug
- USB-C power cable and power adapter
- 19 mm wrench for T-piece installation
EU Drinking Water Directive 98/83/EC
The T-piece with drinking water contact complies with European standards. Material: CW509L, listed in the German Federal Environment Agency (UBA) register of approved materials (edition May 14, 2020, section 2.1.3.1).
Technical Specifications
| Parameter | Value |
|---|---|
| SKU | AQXWIE02 |
| Power supply | USB-C 5V/1A (external) |
| Battery | Bobbin Cell C ER26500 (lithium thionyl chloride) |
| Processor | ESP32-WROOM_32E (Xtensa Dual Core 32-bit, 240 MHz, 520 KB RAM) |
| WLAN | IEEE 802.11 b/g/n (2.4 GHz) -- Aqua-Scope Cloud, MQTT, JSON |
| Bluetooth | 5 LE (UART profile) |
| LoRa | 868--869 MHz, 4 dBm (for motor control) |
| Pressure sensor | 0--10 bar (0--1000 kPa), overload 150% |
| Connection | G1/4" internal thread, I2C |
| Accuracy | <1% dynamic |
| Sensitivity | <250 ml/min (with pressure reducer), <2000 ml/min (without) |
| Pipe check sensitivity | <4 ml/hour |
| Temperature sensor | Integrated in sensor head |
| Dimensions (main unit) | 91 x 91 x 30 mm |
| Weight (main unit) | 105 g |
| Weight (sensor head) | 140 g |
| Protection rating | IP65 (main unit) / IP67 (sensor head) |
| Controls | 3-color LED, single button |
| Operating temperature | -20 to +50 °C |
| Storage/transport temperature | -65 to +125 °C |
| Relative humidity | 0--90% |
| Radio emissions (WLAN) | 2.4 GHz broadband (EN 300 328) |
| Radio emissions (LoRa) | 868--869 MHz, 4 dBm (2.5 mW) |