Technical Data Ld5000; General; System Components; Measuring Instrument And Controls - Trotec LD5000 Manuel D'utilisation

4. Technical data LD5000

Analysis bandwidth:
Filter limit frequencies: 70, 106, 160, 240, 360,
540, 800, 1200, 1800 Hz
Histogram recording:
Noise level storage:
LCD display: illuminated display, 130 x 36 mm
Power supply 1: 8 x 1.5 V AA standard batteries
Power supply 2: 8 x 1.2 V rechargeable batteries
Duration of use: > 35h (standard batteries),
>15h rechargeable batteries
Storage capacity:
Muting key:
Operating temperature:
Storage temperature:
Operational protection class:
Dimensions (L x W x H): 215 x 95 x 110 mm
Weight: 1200 g (with batteries)

5. General

The LD5000 leak detector is used for the universal detection
of leaks in the pipework of drinking water supplies as well
as for determining the routing of the pipework (in pipe
location mode). Of course, the equipment can also be used
on other pipework systems, provided the gas or liquid
escapes from the pipe under pressure and the resulting
ground vibrations extend as far as the surface. With the
LD5000 it possible both to isolate leaks and to pinpoint
precisely the location of the damage.
The double-segment display (DSD) allows both the minimum
value of the continuous noise as well as the background
noise to be displayed. By using the muting function when
relocating the ground microphone, a new minimum is dis-
played. Thus, a comparison of the measured values is
always possible. With the function "HISTOGRAM" (figure
G), measurement positions are stored one after the other.
Impulse-type interference is acoustically suppressed by
means of the computer-aided background noise suppres -
sion employed in this equipment. Primarily only a continuous
noise, as generated by a leak in a pipe, will be displayed
as the minimum value.
In the case of pipe location however, for example the
location of plastic pipework in conjunction with an RSP3,
recording of the impulses is desired, and improves the lo-
cating results. For this reason, the LD5000 has a special
pipe location mode, which is activated by pressing the
symbol key after switching on.
A further important function of the LD5000 is that of noise
level recording, with which the development of a noise
over a certain period of time can be displayed graphically
on the LCD display.

6. System components

6.1 Measuring instrument and controls

The leak detector is enclosed in a splash-proof, impact-
resistant plastic casing. The few soft keys on the operating
panel (figure A) are arranged so that they can be easily
pressed, even when wearing gloves. The display is fitted
with background illumination, thus making it possible to
work under difficult lighting conditions or at night.

6.2 Power supply and battery change

Every time the equipment is switched on, the current
40 Hz - 4000 Hz
battery condition is displayed in the start-up display. Ad-
ditionally, the battery condition is continuously monitored
whilst working with the leak detector. If the battery voltage
sinks too low, a blinking battery symbol will be displayed
9 double displays
in the top right-hand corner of the display. From this point
3, 10, 30 min
it is still possible for the instrument to operate for approx.
four more hours.
The batteries necessary for the power supply are located
in the battery compartments in the base of the unit (figure
C). After loosening the locking screws
(alternative)
baseplate, the battery compartments are accessible and
the batteries can be exchanged. Be sure to insert the
batteries with the correct polarity.
9 measured values

6.3 Microphones and headphones

present
6.3.1 Connectors for microphones and
-10 to +50 °C

headphones

-10 to +70 °C
The connection sockets for the microphones and head -
IP 54
phones (figure B) are located on both sides of the unit and
can be rapidly plugged-in and unplugged. These connection
sockets are only suitable for headphones and microphones
that are listed under "Scope of supply" as being included
in the package, or which are available as accessories.
Connecting headphones or microphones other than those
listed may lead to the equipment failing or being dam-
aged.

6.3.2 Universal microphone PAM-U

The PAM-U is supplied as a standard microphone with an
extension arm. This microphone can be used universally
in the three versions, "probe tip", "magnet" and "tripod",
by exchanging the contact tip with various available
adaptors.
Probe tip version: In this version, the PAM-U is suitable
for listening to valves, hydrants, on walls or directly
accessible pipes. Especially noteworthy is its use as a
ground microphone in the case of soft ground (earth,
lawns, etc.). The tip is pushed as far as possible into the
ground to achieve optimum acoustic contact with the
noise source. The use of an extension arm VST 1 makes
the working posture more comfortable whilst inserting
the probe; however due to the extension arm the influence
of wind and environmental noise will be greater.
Note: When pulling the microphone out, always
pull the microphone itself and not the cable,
as the cable may otherwise be damaged.
Magnet version: Since even the slightest trembling move-
ment when holding the microphone can create loud noises
that interfere with the measurement, it is best if you can
let go of the microphone whilst taking a measurement.
The magnet, which is screwed on at the front, is suitable
for this purpose. The high adhesion of the magnet achieves
an excellent acoustic bond. However this is only possible
in the case of contact with ferromagnetic materials, and
not in the case of plastic, stainless steel, etc.
Note: When removing the microphone from the
valve, always pull the microphone itself and not
the cable, as the cable may otherwise be damaged.
Tripod version: By screwing on the tripod, the PAM-U
can also be used as a ground microphone on hard ground.
Shielding against environmental noise, above all wind, is
not as ideal as with the PAM W-1 ground microphone, but
nevertheless very good results can be achieved with this
version.
and opening the
Operating manual LD5000
6.3.3 Ground microphones
The optionally available ground microphones PAM B-1
and PAM W-1 are active piezo ground microphones for
roads and hard ground surfaces. Connecting cable VK 65
is needed to connect these ground microphones to the
LD5000. The PAM B-1 is supplied ex-works with a tripod.
The PAM W-1 is a microphone with especially good wind-
protection, which is achieved by the use of a protective
shield. In order to reduce background noise, above all in
strong wind, the support arm can be removed by turning
it a quarter of a turn to the left.
Important note: Piezo microphones should
not be subjected to hard impacts, so always
set them down gently!
6.3.4 Headphones
The noise-cancelling headphones model KR 2 are delivered
as standard. These electrodynamic headphones exhibit
good reproduction of leakage noises. Also suitable for use
in this context are the extremely high noise-damping head-
phones model KM 2, available as an optional extra. When
using other headphone models, compliance with the Swiss
noise control regulations, VBG 121, cannot be guaranteed.
According to paragraph 10 of these regulations, the loudness
of headphones must not exceed 85 dB.

7. Start of operation and usage

7.1 Start of operation

7.1.1 Connection of headphones and
microphone
Always connect the headphones and microphone before
switching on the equipment. When switching off, always
switch off the equipment before disconnecting the micro-
phone and headphones.
7.1.2 Switching the equipment on and off
The equipment is switched on and off by pressing and
holding the On / Off key . After switching on, the start-
up screen appears, showing the current version number
and the battery status. After a few seconds, the start menu
appears (figure A, ), showing the most recent settings.
Automatic power-off: After 35 minutes of operation, the
equipment switches off automatically. In the histogram
operating mode, automatic power-off also occurs after
approx. 35 minutes unless the muting key
mination key has been pressed in the meantime.
7.1.3 Switching the display illumination
on and off
By briefly pressing the On / Off key , when the equipment
is operating, the display illumination will be activated or
de-activated.

7.2 Usage

Various equipment settings can be carried out before
and during measurement. In addition to the main menu
(figure A, ), various displays are shown on the screen
after selecting the operating modes and setting options
listed below.

7.2.1 Setting volume and amplification

The LD5000 has a double controller for volume and am-
plification. This enables every user to achieve the optimum
setting according to his/her personal preferences.
or the illu-
B - 02