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Summary of Contents for HWM DXmic
- Page 1 DXmic User Manual Version 2 CLEAN WATER Warning: This manual contains important safety and operating information. Please read, understand and follow the instructions in the manual. Page 0 of 35...
- Page 2 Contents Contents Introduction Warnings System Description Optional Additional Equipment DXmic Overview Preparing the DXmic for Use Using the DXmic Filter Selection Survey Mode MLP Mode DXmic Pro Functionality DXmic Pro App Touch Screen Calibration Software Update Guidance to Effective Acoustic Leak Detection...
- Page 3 The DXmic has a touch screen LCD display and the advanced, easy-to-use features of the DXmic enable the operator to pinpoint leaks faster and with more confidence than ever before.
- Page 4 Warnings Lithium ion batteries The batteries supplied and fitted to the DXmic units are rechargeable lithium ion. Do not short circuit or overcharge these batteries. Any misuse of these batteries may result in explosion or fire. They must not be used in any other application or used with any other equipment. Only batteries supplied by HWM Water must be used.
- Page 5 Dans le but de réduire les risques de brouillage radioélectrique à l'intention des autres utilisateurs, il faut choisir le type d'antenne et son gain de sorte que la puissance isotrope rayonnée équivalente (p.i.r.e.) ne dépasse pas l'intensité nécessaire à l'établissement d'une communication satisfaisante.
- Page 6 System Description Control unit – robust for field conditions The DXmic is easily portable, and can be carried by either hand or shoulder-strap. Its injection- moulded housing is purpose-designed to provide long-term field durability and effective protection under realistic site conditions and is environmentally rated to IP65.
- Page 7 DXmic with optional hand probe and tripod Equipment list including optional extras: 1.
- Page 8 DXmic Overview Number Description On/Off button Settings Microphone gain control High pass filter mode Low pass filter mode No filter mode Adjust band width Adjust band position Minimum level profiling mode Carry strap Headphone volume control Mute Battery charge state...
- Page 9 Number Description Sensor connection USB port (USB micro, cable not included) Charging connector Headphone jack Battery compartment Connector cover Headphone cover Page 8 of 35...
- Page 10 Battery charging To charge the batteries, lift the rubber connector cover cap the charge lead from the charger to the battery charging connector on the top of the DXmic. Plug the charger unit into the mains supply. Note that the battery will not charge through the USB port.
- Page 11 The DXmic case comes equipped with an internal USB socket and DC power plug. The USB socket can be used to connect the USB charging cable for Bluetooth headphones. The DC power plug can be directly connected to DXmic. In order for the devices to charge, a power adapter (either the plug-top power supply or the 12V cigarette lighter adapter) has to be connected to the barrel connector on the side of the case.
- Page 12 DXmic Switch On/Off Switch the unit on with a long (2 sec) press of the On/Off button on the front of the DXmic. The unit will switch on and remain switched on until this same button is long pressed again, or is left unused for a long period of time (1 hour from last interaction).
- Page 13 Headphone pairing The DXmic is compatible with wireless Bluetooth headphones. To pair your headphones with the device, go to ‘Settings’ and select ‘Bluetooth’. Switch Bluetooth ‘ON’ and press ‘Pair’. Set headphones into pairing mode by holding down the power button until the LED flashes red and green, and the headphones will audibly say ‘Pairing’.
- Page 14 Alternatively, you can plug wired headphones into the headphone jack located under the rubber headphone cover on top of the DXmic control unit to listen to audio. You can later temporarily mute the headphones by pressing the ‘mute’ button on the main display screen. Firmly push the rubber headphone cover back into position to protect the jack when not in use.
- Page 15 3. HIGH - cuts the output at level 90 NOTE: A small audio delay has been introduced in the signal path to allow DXmic to react to loud noises. The perceived delay might slightly increase when Bluetooth headphones are used.
- Page 16 Filter Selection To clarify the leak noise, background or unwanted noise frequencies can be filtered out using a combination of the controls on the DXmic. Unwanted frequencies can be filtered out via the bandpass, bandwidth and filter position buttons. There are two modes of operation – survey mode and minimum level profiling mode (MLP)
- Page 17 Pre-set Filter for High Frequencies Only. Used on metal pipes High pass filter Pre-set for Filter for Low Frequencies. For Plastic (medium density polyethylene (MDPE)) pipes. The frequency spectrum indicator bar shows both medium and low frequencies are allowed through. Low pass filter Adjustable Filters –...
- Page 18 The ground microphone is placed on the ground and the sample button pressed momentarily. The DXmic then records the minimum noise over three seconds. As each measurement is taken the histogram graph is built up showing the difference between each reading visually and numerically, making noise level comparison a simple task.
- Page 19 Date and time of measurement Noise level indicator Navigate measurements Noise level of selected measurement Delete selected Survey Mode measurement Selected measurement Take measurement Delete all measurements Each time the red record ‘Take measurement’ button is pressed, the leak noise acquired in the previous three seconds is recorded and displayed as a vertical bar on a histogram.
- Page 20 Start/stop audio recording Play/pause selected sample DXmic Pro allows the user to record sound samples when in MLP mode. To start an audio sample recording press the red microphone button. Up to two minutes of sound can be recorded per sample. The recording can be stopped by pressing the stop button, noise level information will be stored with it.
- Page 21 «DXmic Pro Functionality»). In order for the app to work correctly, it is necessary for the DXmic Pro to remain in a power on state and have Bluetooth functionality activated (The display should show “BT” in the upper left corner, Bluetooth can be enabled in the settings page under “Bluetooth”).
- Page 22 Connection to DXmic Pro To connect to DXmic Pro, launch the DXmic Pro App on your mobile device. The App will show a list of paired DXmic Pro. If no device is shown make sure your DXmic is correctly paired to your mobile device (see above).
- Page 23 Selecting a recording from the graph will allow the user to play the audio sample by pressing the play button. If the selected recording has not been downloaded yet, it will be downloaded. During the download process, DXmic Pro will enter file transfer mode. All downloaded recordings are accessible by selecting “Manage Recordings” in the context menu.
- Page 24 “Modify” in the upper right corner. To set the new location move the pin on the map and tap on “Set”. Sharing data The DXmic Pro App allows the user to share measurement data and recordings via email or using our cloud based web portal DataGate. Page 23 of 35...
- Page 25 Tapping the “Share” button will summon the Share screen. Here it is possible to select which measurement to share by tapping on the bars in the graph. It is possible to enter a name for the set of selected measurements; this name will be used to generate the email subject and/or the sub-account name on DataGate.
- Page 26 On DataGate your measurements will be grouped in sub-accounts, also called DMA (District Metered Area). It is either possible to create a new DMA containing the selected measurements, or to append the measurements to an existing DMA. Tap on “Upload to DataGate” to upload the data.
- Page 27 Page 26 of 35...
- Page 28 Touch Screen Calibration To calibrate the touch screen, turn off the DXmic by pressing the push button for three seconds. Push the button again to turn on the device. Keep the button pressed until after the splash screen disappears, the calibration screen will appear. Tap the flashing dots as accurately as possible to complete the calibration process.
- Page 29 Guidance to Effective Acoustic Leak Detection All acoustic leak detection methods are based on the premise that normal water passage through pipelines takes place noiselessly. When the water passage is disturbed a noise is created. Causes can include partial pipe blockages, sudden changes in pipe diameter, abrupt changes in pipe direction, pumps or meters installed in the pipeline, consumer usage or pipeline damage.
- Page 30 frequency bands as leak noise. Sometimes it is necessary to use leak detection techniques at night when interfering noises are less. It is very important to adopt a methodical approach when using any instrument for acoustic leak detection. It is necessary to practice the technique in order to distinguish between different sounds, recognising background or interfering noises, so that they can be eliminated.
- Page 31 loudest leak noise will then indicate the location of the leak bearing in mind the ground conditions already mentioned. Page 30 of 35...
- Page 32 DXmic Technical Specification Control Unit Processor: 144MHz 32 bit Input impedance: 1MOhm Output impedance: 6 to 16 Ohms Amplification: 46dB Frequency range: 20 to 5200Hz Distortion: Better than 1% Battery: 2 x Lithium ion 1.8Ah rechargeable batteries Battery life: Minimum 15 hours (with maximum backlight)
- Page 33 Microphone High sensitivity piezo-electric sensor mounted in windproof, nitrile rubber housing Low noise 1.5m cable (detachable) Weight: 2.9kg Hand Probe Attachment (Optional Upgrade) The hand probe option includes the tripod foot and two stainless steel probe rods with magnetic contact (each 400mm in length) Combined weight of rods 162g Headphones Studio quality headphones supplied as standard.
- Page 34 Warranty All equipment is warranted by HWM Water Ltd to be free from defects in materials and workmanship for a period of one year (unless otherwise stated) from the date of shipment to the original customer. This warranty is only valid if the equipment has been installed and used in the correct manner as described in this manual.
- Page 35 All Images, text and designs are protected by international and UK copyright law, and remain the property of HWM. It is against the law to copy or use any of the content from HWM website or literature without the written consent of HWM.
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