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Summary of Contents for Palmer Lmic
- Page 1 Acoustic Listening Systems Lmic, Gmic and Rmic Operating Manual Palmer Environmental Ty Coch House Llantarnam Park Way Cwmbran NP44 3AW United Kingdom Tel: +44 (0) 1633 489479 Fax: +44 (0) 1633 877857 Email: info@palmer.co.uk Web: www.palmer.co.uk Acoustics Manual Issue 1...
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Page 2: Table Of Contents
Contents Introduction and Scope ................... 2 Guidance to Effective Acoustic Leak Detection ............ 3 Battery Warning......................5 Lmic Acoustic Leak Sounding System ..............6 Preparing the Lmic for use..................7 Using the Lmic ......................8 Lmic Technical specification .................. 9 Gmic Acoustic Leak Sounding System.............. -
Page 3: Introduction And Scope
The basics in the general operation are the same but each system has its own advantages. Lmic is designed as a low cost lightweight system which is simple to use yet highly effective in the detection the sources of leak noise in industrial, commercial and even household situations and can be used as a tool as part of a plumbing tool kit. -
Page 4: Guidance To Effective Acoustic Leak Detection
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 5 Once you have listened to the noise through the headphones, switch off the amplifier (hand button on the Lmic or the headphones button on Gmic/Rmic) and move the microphone foot or hand probe to the next test position.
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Page 6: Battery Warning
Only batteries supplied by Palmer Environmental must be used. Lmic The battery fitted to the Lmic is a rechargeable 9V PP3 Nickel Hydride battery. Any replacement battery must be rechargeable and have the same specification. -
Page 7: Lmic Acoustic Leak Sounding System
Lmic Acoustic Leak Sounding System The Lmic (pronounced “el mike“) is an easy-to-use, low cost, electronic listening stick and ground microphone combined. It is ideal for general leak sounding operations and can be fitted with either a tripod foot (for use as a ground microphone) or probe rods (for sounding at fittings or in soft ground). -
Page 8: Preparing The Lmic For Use
Charging the Lmic batteries Connect the charger lead to the rear connector of the Lmic and connect the charger power lead to the 240V AC supply. The Lmic can then be charged overnight. An optional accessory is the car cigarette lighter adapter that can also be used to charge the batteries. -
Page 9: Using The Lmic
Using the Lmic The Lmic is simple to operate. Select either the probe rods or the tripod unit and screw into the microphone unit. (Use the tripod foot on hard ground and use the probe rods on soft ground or when accessing water pipe fittings). -
Page 10: Lmic Technical Specification
Lmic Technical specification Lmic hand held unit/sensor housing Piezoelectric high sensitivity sensor mounted in PC-ABS (polycarbonate) housing Single headphone/charger input socket with automatic sensing of device connected Connectors Amphenol military specification connectors for microphone and headphone/charger connections Charging Universal 110-240V AC charger with 12V DC output Car cigarette lighter adapter with 12V DC output (optional accessory) Charge time: Overnight charge. -
Page 11: Gmic Acoustic Leak Sounding System
Gmic Acoustic Leak Sounding System Introduction The Gmic (pronounced Gee Mike) is a highly effective ground microphone. It consists of a lightweight portable amplifier module, a set of mono headphones, and a combination listening probe and ground microphone. It is an effective electronic instrument for locating and pinpointing leaks from buried water pipes. - Page 12 System Description Control unit – robust for field conditions The control unit is the operator interface. It is very easily portable, and can be carried with either hand- or shoulder-strap. Its injection-moulded housings are purpose-designed to provide long-term field durability and effective protection under realistic site conditions.
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Page 13: Gmic Controls
Gmic Controls The Gmic is simple to operate and has a limited number of controls. Controls and functions of the Gmic base unit Battery Headphone Signal volume life strength indicator indicator display High pass filter Low pass selector filters buttons selection buttons On / Off... -
Page 14: Preparing The Gmic For Use
Although the batteries are rechargeable, they may eventually need to be replaced. Only batteries configured to the correct specification and type must be used. These are available from Palmer Environmental. To replace the batteries, first switch the unit off. Unscrew the three screws underneath the unit, remove the packing foam, then unplug the battery pack connector releasing the batteries. -
Page 15: Using The Gmic
Using the Gmic Select the sensor attachment required, (the steel rod(s) or the tripod), and screw this into the bottom of the microphone housing. Plug the headphones into the Gmic. Gmic Switch On/Off. Switch the unit on by momentarily pressing the On/Off switch. The unit will switch on and remain switched on until this same button is pressed again unless it is left unused. - Page 16 Filter selection To clarify the leak noise, background or unwanted noise frequencies can be filtered out using the High Pass and Low Pass filter buttons. To filter out low frequencies, use the High Pass buttons as shown below. High High pass filter settings pass filter High Pass filter...
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Page 17: Gmic Technical Specification
Gmic Technical Specification Control Unit Low power analogue design with active digitally switched filters 2 x 16 character LCD display with backlight control LCD numerical display of: ·Signal level display 0 – 99 ·Headphone volume control ·Filter settings (25 possible) ·Battery level Filter Options ·High Pass - 20, 30, 60, 120Hz... - Page 18 Microphone Housing High sensitivity piezo-electric sensor mounted in rubber housing with integral strain relief Low noise 1.5m cable (detachable) Weight 500g Foot Attachment Cast metal tripod for ground contact Hand Probe Attachment 2 stainless steel extension rods (each 400mm in length) Combined weight of rods 162g Headphones Lightweight robust high fidelity headphones...
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Page 19: Rmic Acoustic Leak Sounding System
Rmic Acoustic Leak Sounding System Introduction The Rmic (pronounced R Mike) is a highly effective ground microphone for all weather conditions. It consists of a lightweight portable amplifier module, as used in the Gmic system, a set of mono headphones, and a ground microphone housed within an acoustically shielded foot. -
Page 20: Microphone Foot Warning
Users must not attempt to unscrew this sensor as this will break internal components of the microphone resulting in irreparable internal damage. Sensor replacement is then the only option. Any necessary repair or dismantling of the foot must be carried out by Palmer Environmental or by an authorised distributor. Sensor:... - Page 21 Rmic System Description Control unit – robust for field conditions The control unit is the operator interface. It is very easily portable, and can be carried with either hand- or shoulder-strap. Its injection-moulded housings are purpose-designed to provide long-term field durability and effective protection under realistic site conditions.
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Page 22: Using The Rmic
Using the Rmic To prepare the Rmic for use follow the instructions for the Gmic The Rmic uses the same control unit as the Gmic and uses the same headphones (and options). The advantage of the Rmic over Gmic is evident when there is a need for the microphone sensor to be acoustically shielded from the surrounding environment –... -
Page 23: Rmic Technical Specification
Rmic Technical Specification Control Unit Low power analogue design with active digitally switched filters 2 x 16 character LCD display with backlight control LCD numerical display of: ·Signal level display 0 – 99 ·Headphone volume control ·Filter settings (25 possible) ·Battery level Filter Options ·High Pass - 20, 30, 60, 120Hz... - Page 24 Microphone Housing 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) 2 stainless steel extension rods (each 400mm in length) Combined weight of rods 162g Headphones Standard Lightweight robust high fidelity headphones Optional upgrade to studio quality or aviation quality headphones Scope of supply Control unit...
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Page 25: Warranty
Warranty All equipment is warrantied by Palmer Environmental 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.
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