Watchlog Bluetooth Digital Datalogging Pressure Gauge & App Manual

Brand: Hydrotechnik UK

Introduction

The WLB-DDPG digital datalogging pressure gauge is an advanced device featuring a built-in high-precision pressure sensor. Pressure readings are displayed in real-time, alongside a selected secondary reading: temperature, full-scale pressure, minimum pressure, or maximum pressure.

The datalogging feature allows data to be stored over time within the gauge's internal storage. This data can be transferred from the device in CSV format using the included USB cable. The gauge appears as an external drive on your Windows or Mac computer, similar to a standard storage device, simplifying the process of copying files.

The gauge is powered by three AA batteries or the supplied USB-C to USB-A cable (5V, 0.15A). It utilizes Bluetooth® technology, enabling connection to the Watchlog Bluetooth app for iOS or Android for up to four gauges simultaneously. This allows for reading and datalogging at a transmission rate of up to 100ms. The large backlit LCD screen is easy to read and can be rotated up to 330° for optimal viewing angles.

Visual Description: The main product image shows the WLB-DDPG gauge with a digital display showing '220.0' with 'bar' and 'FS' indicators, and 'REC' indicating datalogging is active. Below the main display, it shows '01.17 bar' and a graph with 'min' and 'max' values. The Hydrotechnik UK logo is prominent.

Precautions

Operating temperature: -20...+65°C.
After powering on the gauge, a zero reset may be required.
Do not touch the measuring diaphragm or disassemble the product.
Take care not to overtighten the gauge.
Do not install when the device is powered on.
Use a correctly sized wrench/spanner to tighten the sensor to the connection port.
Only rotate the dial after installation, and do not rotate beyond the maximum limit.

For technical information, download the WLB-DDPG datasheet by visiting: HYDROTECHNIK.CO.UK/DDPG.

LCD Display

The LCD screen provides comprehensive information about the gauge's status and readings.

Visual Description: The LCD display is segmented into several areas:

USB power indicator: Indicates if the gauge is powered via USB.
Datalogger recording indicator: Shows if datalogging is active (often indicated by 'REC').
Datalogger count: Displays the number of recordings stored.
33-segment current pressure: A bar graph representation of the pressure as a percentage of the full gauge range.
Currently selected pressure units: Displays the active unit (e.g., bar, PSI).
5-segment battery indicator: Shows the remaining battery power.
Bluetooth connectivity indicator: Indicates the status of the Bluetooth connection.
Secondary readings: Displays selected secondary data like temperature or min/max values.
Currently selected secondary units: Shows the units for the secondary readings.
Primary (live) readings: Displays the main, real-time pressure measurement.

Note: The onboard power management prioritizes USB power when available, allowing USB power usage without removing the 3x AAA batteries.

Gauge Use

The following table outlines the functions of the gauge's buttons:

Button	Short Press	Long Press (3 seconds)
[Power]/[Backlight]	Backlight on (when gauge is powered on).	Power on (when gauge is powered off).
[UNIT] / [MENU]	Toggle between pressure units (PSI, mH2O, inHg, MPa, ATM, kgf, or bar).	Enter settings menu (refer to settings menu section).
[MODE] / [ZERO]	Change displayed secondary readings (Full Scale (FS), Temp (°C), Temp (°F), Pressure (MIN), or Pressure (MAX)).	Set the tare point to be considered zero system pressure and zero the min/max values.
[SET] / [REC]	Confirm selected settings (when in settings menu).	Start or stop datalogging.

Note: The onboard power management will use USB power where possible, meaning USB power may be used without removing the 3x AAA batteries.

Datalogging with the DDPG

The WLB-DDPG allows for data logging directly on the device.

Long press the [SET] / [REC] button for 3 seconds to begin logging data. Another long press ends datalogging.
The screen will display 'REC' (2) to indicate that the gauge is actively logging measured data.
A number (3) on the gauge represents how many recordings are stored on the device. For example, '7' indicates the current recording is the 7th saved to the gauge's internal storage.

Visual Description: The gauge display shows 'REC' and a count. The image shows the gauge with callouts pointing to the SET/REC button (1), the REC indicator (2), and the recording count (3).

Downloading & Opening Test Data

Data logged by the gauge can be easily transferred to a computer.

Connect the gauge to a Windows or Mac PC using the supplied USB-C cable via the USB-C port on top of the device (4).
When connected, the gauge will display 'PC USB' (5) until disconnected.
The gauge will appear as an external drive in Windows Explorer or Mac Finder (6).
Opening this drive will reveal all logged data as a series of CSV files (7). These files can be dragged or copied and pasted to your desktop or another folder, just like any standard USB drive.
The CSV files can be opened in spreadsheet applications like Microsoft Excel (8) or analyzed using the Watchlog CSV Visualizer software for quick, drag-and-drop analysis.

Visual Description: Images show the USB-C connection port (4), the gauge displaying 'PC USB' (5), a file explorer window showing a USB drive with CSV files (6, 7), and a spreadsheet view of the data (8).

Watchlog CSV Visualizer

The CSV files generated by the datalogging gauge are fully compatible with Hydrotechnik's Watchlog CSV software for Windows. This software allows for drag-and-drop CSV graphing, analysis, and annotation.

Learn more and download a free 7-day trial by visiting: HYDROTECHNIK.CO.UK/CSV.

Visual Description: A screenshot shows the Watchlog CSV Visualizer software interface, displaying a graph of pressure over time with options for zoom, pan, filter, and export. The graph axes are labeled 'time' and 'p1 [bar]'.

Watchlog Bluetooth Live View & Datalogging App

The Watchlog Bluetooth app provides numerical and graphical data viewing from up to four Watchlog Bluetooth sensors simultaneously, along with data logging and sharing capabilities directly from a mobile device.

To download the app or watch a video overview, scan the QR code or visit hydrotechnik.co.uk/ddpg.

Connecting Your Devices

When opening the app for the first time, no devices will be present. Press the '[Search]' button (1) to scan for nearby powered-on devices.
To connect, tap the white Bluetooth icon (2) for the desired device. The icon turns yellow during connection attempt and blue upon successful connection. The first connection prompts for a device name, units, and color, which is used for graphs. Up to 4 devices can be connected.
Press the gear cog icon (3) to edit the name, display units, or color of a previously connected device.
Once at least one device is connected, press the '[Live]' button (4) to view numerical and graphical sensor data for all connected sensors.

Viewing Live Data

The app displays real-time data from connected sensors.

Each connected sensor is shown as a tile (5) with its name, live pressure, and min/max values.
Below the tiles, sensor data is displayed graphically using the selected color for each sensor (6).
Tapping the graph at any point shows the values for all sensors at that specific time (7).
The graph can be scrolled left and right once at least 60 seconds of data are displayed. Pressing the '[Live]' button (8) returns to the most recent live point.
Pressing the '[Record]' button (9) starts recording live data; tapping again stops recording. Share options are then available.
Return to the Devices page via the '[Devices]' button (10) to change connection or device settings.

Visual Description: The app screenshots show the connection process with numbered buttons and icons. Another screenshot displays the live data view, featuring sensor tiles (5) with names and readings, a graph (6) showing multiple sensor lines, and navigation buttons (7, 8, 9, 10).