levr LIM-05 User manual

LIM-05
pulse fault locator user manual
Software version: 17.05
USER MANUAL
EZUP “LEVR” s.c.
03-193 Warsaw
ul. Krzyżówki 5
tel./fax: [phone]
Ver. 17.12

C
CO ON NT TE EN NT TS S: :
1. Preinsulated district heating pipeline as a tested object ......................................................4
2. General information about the LIM-05 instrument ............................................................4
3. Installation of the instrument at the measurement station..................................................7
3.1 Connection of the locator to the alarm system of the district heating pipeline..7
4. Keypad description ................................................................................................................8
4.1 “1” key.......................................................................................................................8
4.2 “2 zoomH” key..........................................................................................................8
4.3 “3 zoomV” key..........................................................................................................8
4.4 “4 K1” key.................................................................................................................8
4.5 “5 PAN” key..............................................................................................................9
4.6 “6 K2” key.................................................................................................................9
4.7 “7 PING” key............................................................................................................9
4.8 “8 LOK” key.............................................................................................................9
4.9 “9 shiftH” key...........................................................................................................9
4.10 “FN” key....................................................................................................................9
4.11 “ENT” key...............................................................................................................10
4.12 “ESC” key...............................................................................................................10
4.13 “•” key .....................................................................................................................10
4.14 “▲” and “▼” keys.................................................................................................10
5. Main menu...........................................................................................................................10
5.1 “Kanał” (Channel) option .....................................................................................10
5.2 “Start/Stop” option ......................................................................................................10
5.3 “Kalibracja” (Calibration) screen........................................................................10
5.4 “Historia” (History) option ...................................................................................11
5.5 “Przebieg roznicowy” (Differential run) option..................................................11
5.6 “Przebieg wejsciowy” (Input run) option ............................................................11
5.7 “Przebieg odniesienia” (Reference run) option...................................................11
5.8 “Info” option...........................................................................................................11
6. Description of the Kalibracja (Calibration) option of the main menu..............................11
6.1 “Długość pętli >” (Loop length>) entry......................................................................12
6.2 “Napięcie progowe Up=” (Voltage threshold Up=) entry...................................13
6.3 “Liczba kanałów=” (Number of channels =) entry.............................................13
6.4 “Przebieg odniesienia” (Reference run) entry.....................................................13
6.5 “Czas martwy=” (Dead time=) entry....................................................................13

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6.6 “VOP=” entry.........................................................................................................13
6.7 “Parametry impulsu>” (Pulse parameters>) entry.............................................13
6.8 “Zakres pomiarowy Uzak=” (Measuring range Uzak=) entry..........................14
6.9 “Wyświetlenie nastaw” (Display settings) function.............................................14
6.10 “Kod PIN=” (PIN code=) entry.............................................................................14
7. Settings requiring a PC...................................................................................................15
7.1 Setting the time.......................................................................................................15
7.2 Setting the date.......................................................................................................15
7.3 Entering the locator name.....................................................................................16
8. Procedure examples ........................................................................................................16
Calibration procedure: Kalibracja (Calibration) option; Długość pętli (Loop length)
entry.....................................................................................................................................16
Channel number entry.......................................................................................................18
Initiate or stop automatic measurements.........................................................................18
Creating and recording the reference run.......................................................................18
Enter the new length of the alarm loop............................................................................18
Changing the number of monitored alarm systems........................................................18
Changing the VOP..............................................................................................................18
Changing the PIN...............................................................................................................18
Displaying the input run....................................................................................................18
Displaying the differential run..........................................................................................19
Changing the dead time.....................................................................................................19
9. Description of the operating environment of the LIM-05 instrument ..............................19
10. Maintenance of the LIM-05 instrument...........................................................................19
11. Disposal of the LIM-05 instrument ..................................................................................19
12. Technical specifications....................................................................................................20

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1
1. . P Pr re ei in ns su ul la at te ed d d di is st tr ri ic ct t h he ea at ti in ng g p pi ip pe el li in ne e a as s a a t te es st te ed d o ob bj je ec ct t
Production of preinsulated pipes with sensor wires ensures good reproducibility of the
product both in terms of the physical properties of materials and reliable geometrical
dimensions. This ensures that certain electrical properties are reproduced in all
products. One of the electrical quantities characteristic to district heating pipelines is
characteristic impedance, amounting to approximately 200 Ω. The impedance is
measured between the carrier pipe and the copper sensor wire. It should be emphasised
that impedance does not depend on the length and diameter of the district heating
pipeline. However, it may change due to: local change of the distance between the
copper wire and the steel pipe, appearance of moisture in polyurethane insulation,
incorrect connection or a break in the detector line. These cases are regarded as faults
that should be located and eliminated. Faults are located using a reflectometer.
Measurement with this instrument requires generation of a very short electric pulse. It
is transmitted between the copper wire and the steel pipe. Since the characteristic
impedance of the measured circuit is constant, the electric pulse moves freely along the
tested pipeline with speed almost equal to the speed of light propagation. If one of the
indicated faults occur at some point of the preinsulated district heating pipeline,
resulting in the abrupt change of characteristic impedance, the measurement pulse will
be fully or partially reflected. The reflectometer measures the time from the sending of
the electrical signal until its reflection returns. Then, using the entered value of
measurement pulse speed and the measured time, it calculates the distance between the
measurement station and the point of reflection, i.e. location of the fault.
The method of fault location in preinsulated district heating pipelines with a detector
loop described above is implemented using the LIM-05 instrument.
2
2. . G Ge en ne er ra al l i in nf fo or rm ma at ti io on n a ab bo ou ut t t th he e L LI IM M- -0 05 5 i in ns st tr ru um me en nt t
The LIM-05 fault locator is a stationary instrument. It can be used to monitor four
sections of the district heating pipeline with a pulse alarm system at the same time. The
monitored section of the sensor wire should not be longer than 2500 m. The
measurement result is presented on a graphical display in the form of an annotated
chart. The result is created based on the difference between the previously recorded
reference run and the chart depicting the current condition. Until a fault is detected, the
chart is a straight line (axis x). Axis x is scaled in units of length [m]. The reference
runs for each monitored section of the network are recorded automatically in the
digital memory of the instrument shortly after the operator initiates the measurement
procedure. During initial calibration of the instrument, the length of axis x on the chart
is adjusted to be a precisely proportionate representation of the length of the monitored
section of the district heating pipeline. Information about the fault, in turn, has the
form of a representation of the reflected measurement pulse depicting its actual
electrical shape. The location (above or under axis x) of the reflected pulse and its
shape indicate the type of the fault (e.g. leak, electrical short circuit of the sensor wire
with the steel pipe) and its intensity. The intensity/degree/size of the fault is
represented by the amplitude (height) of the reflected pulse. The amplitude is
measured in units of voltage [mV] and [V]. Axis y is scaled in these units by default.
The distance from the beginning of axis x (x = 0) to the beginning (front) of the pulse
is proportionate to the distance between the beginning of the district heating pipeline

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and the location of the fault. The chart depicts the actual distance in [m]. Figures 1 and
2 depict the method of presentation of measurement information.
Fig. 1 Depiction of the reflected measurement pulse on the detector screen in case of a leak or short
circuit of the sensor wire with the steel pipe (left chart) and breaking of the sensor wire (right
chart)

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Fig. 2 The drawing depicts the method of presentation of measurement information, where:
Kanal=1 (Channel = 1) – number of the measurement channel (number of the monitored section
of the district heating pipeline)
AWARIA (FAULT) – description of the status of the indicated district heating pipeline section
dif – differential chart created as the graphical difference between the current run and the
reference run
2005/11/24; 12:12:00 – current date and time
K1 – K1 cursor at position x = 232.8 m
K2 – K2 cursor at position x = 256 m (actual distance between the reflectometer and location of
the fault measured along the connection wire and sensor wire)
D = 23.2 m – distance between K1 and K2 cursors referred to the actual length of the section of
the alarm wire between these cursors
x – default axis x
y – default axis y
-Up;+Up – voltage thresholds for initiation of automatic fault detection and indication (the dead
area is 2Up)
-Uzak;+Uzak – voltage limits of the measuring range.
Figure 2 depicts the impact of the voltage threshold for fault identification (-Up and
+Up voltage) on interpretation of measurement results. During automatic or manual
image analysis, pulses with amplitudes within the ±Up range are not considered. The
K2 cursor will omit such pulses.
Pulses with duration shorter than the duration of the measurement pulse will be
omitted as well, even when their amplitude is higher than |Up|. This case will also be
presented on the drawing.
Description of alarm loop
condition Chart type Date and time
K1 cursor location
K2 cur
sor
Length of the sensor wire
section represented between
K1 and K2 cursors Distance to the fault location
indicated by the K2 cursor
measuring range
dead zone
axis x

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3
3. . I In ns st ta al ll la at ti io on n o of f t th he e i in ns st tr ru um me en nt t a at t t th he e m me ea as su ur re em me en nt t s st ta at ti io on n
The LIM-05 locator is a stationary instrument supplied by a 230 V 50 Hz power
source. The instrument can monitor four district heating pipeline sections. The number
of measurement channels in use can be specified during programming of the
measurement conditions for the instrument. There is no need to screw adapters, e.g.
66LV72, into the measurement ports that are not going to be used. The design of the
instrument ensures that it is not sensitive to power outages. The recorded measurement
procedure and measurement data are saved until the operating conditions return to
normal.
3.1 Connection of the locator to the alarm system of the
district heating pipeline
The locator is connected to the carrier pipe and copper sensor wire with a coaxial cable
and the 67LV15 box. The box is fixed on a steel coupling welded to the carrier pipe.
The coupling enables electrical contact of the measurement connector with the carrier
pipe. The cable of the box should be connected to the sensor wire of the preinsulated
pipe. The 67LV15 box should be connected with the LIM-05 fault locator using one of
the indicated measurement cables with the following “electrical lengths”: 5 m
(67LV09), 10 m (67LV49), 15 m (67LV50), 20 m (67LV51), 25 m (67LV52). The
second end of the sensor wire is connected to the 67LV15 box equipped with the
67LV23 port plug.
Fig. 3. Sample connection of the locator to the alarm system of the preinsulated district heating
pipeline.
Coaxial cable
67LV15 connection
230 V AC power supply
67LV15 box and
67LV23 plug

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4
4. . K Ke ey yp pa ad d d de es sc cr ri ip pt ti io on n
Figure 4 depicts the keypad of the LIM-05 locator.
Fig. 4. Keypad
Most numeric keys have double function. The numeric function of these keys and the
“.” key is activated only when entering numerical data (selection of options and entries
or entering data in the “Kalibracja” (Calibration) menu.
4.1 “1” key
Press the “4 K1” or “6 K2” key once to activate movement of the cursor –
respectively, K1 or K2. The selected cursor will be moved by one step (10 units of
length) whenever you press a key with the “▲” (right) or “▼” (left) symbol. If you
hold the “1” button pressed when moving the selected cursor, the step will be ten times
shorter (one unit of length)*. When you hold “▼” or “▲” buttons pressed for more
than 1 s, in turn, the cursor will be moving in steps of 100 units for as long as the
selected key remains pressed. The function of the “1” key is the overriding function for
cursor movement modification.
)
*
The standard step of the cursor is 10 units of length. One unit of length is 0.23 VOP[m]. The VOP is a
coefficient that expresses the ratio of the speed of propagation of the electrical pulse in the tested
environment and the speed of light propagation in vacuum. For district heating pipelines with a
copper sensor wire, this coefficient adopts values of the 0.91 – 0.93 range.
4.2 “2 zoomH” key
Press the “2 zoomH” key once to initiate the function of widening or narrowing the
chart along the x axis (length axis). To extend the chart, press the “▲” key; to narrow
it – press the “▼” key. Use of this function is indicated by the “zoomH” text appearing
in the bottom right part of the screen.
4.3 “3 zoomV” key
Press the “3 zoomV” key once to initiate the function of vertical increase or decrease
of the run on the screen (along the y axis). Use “▲” and “▼” buttons to, respectively,
increase or decrease the chart along the y axis (amplification adjustment). Use of this
function is indicated by the appearance of the “zoomV” text in the bottom right of the
display and specification of the amplification in mV/pixel.
4.4 “4 K1” key
Press the “4 K1” key once to activate movement of the K1 cursor. The cursor will be
moved by one step (10 units of length) whenever you press a key with the “▲” (right)
or “▼” (left) symbol. If you hold the “1” button pressed when moving the cursor, the
step will be ten times shorter (one unit of length). When you hold “▼” or “▲” buttons
pressed for more than 1 s, in turn, the cursor will be moving in steps of 100 units for as
long as the selected key remains pressed. The function of the “1” key is the overriding
function for cursor movement modification.

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“K1” text will be displayed in the bottom right part of the screen after pressing the “4
K1” key.
4.5 “5 PAN” key
The screen of the instrument can display effects accompanying the movement of the
measurement pulse along the entire length of the alarm wire in the form of a chart. The
image can also be set to depict a chart of a selected fragment of the district heating
pipeline. Press the “5 PAN” key to restore the chart representing the entire length of
the monitored district heating pipeline. This will simultaneously restore the factory
settings of K1, zoomV and shiftH functions. The K1 cursor will return to the beginning
of the chart (x = 0). Amplification will be set to 10 mV/pixel. The chart (x axis) will be
located in the centre of the screen (y = 0 mV).
4.6 “6 K2” key
Press the “6 K2” key once to activate movement of the K2 cursor. The cursor will be
moved by one step (10 units of length) whenever you press a key with the “▲” (right)
or “▼” (left) symbol. If you hold the “1” button pressed when moving the cursor, the
step will be ten times shorter (one unit of length). When you hold “▼” or “▲” buttons
pressed for more than 1 s, in turn, the cursor will be moving in steps of 100 units for as
long as the selected key remains pressed. The function of the “1” key is the overriding
function for cursor movement modification.
“K2” text will be displayed in the bottom right part of the screen after pressing the “6
K2” key.
4.7 “7 PING” key
Activating the “PING” function will force a measurement cycle in the selected
measurement channel and display the measured run. Depending on the enabled option,
this may be an input run depicting the current status of the monitored district heating
pipeline or a differential run (in relation to the reference run).
4.8 “8 LOK” key
The differential run may contain information about the presence of one or many faults
in the monitored section of the district heating pipeline. Activate the “LOK” function
(press the “8” key) to set the K2 cursor in the place where the first fault is indicated on
the chart. The screen will only depict a fragment of the differential run containing the
image of the reflected measurement pulse at maximum zoom and the K2 cursor at the
beginning of this image. Press the “8 LOK” key once more to find the next fault and
display it as indicated above. In every case, the distance to the location of the fault will
be displayed next to the K2 cursor. Press the “8 LOK” key after the last reflection of
the measurement pulse (last fault location) is displayed to return to display of the
differential run for the entire length of the monitored section of the district heating
pipeline.
4.9 “9 shiftH” key
The “shiftH” function can be used to shift the chart along the default y axis. To do so,
use “▲” (up) and “▼” (down) keys. When this function is activated, the “shiftH” text
will be displayed in the bottom right corner of the screen, complete with the value of
the shift in [mV].
4.10 “FN” key
Press the “FN” key to display the main menu of the locator on the screen.

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4.11 “ENT” key
Use the “ENT” key to confirm your selection.
4.12 “ESC” key
Use the “ESC” key to leave your selection.
4.13 “•” key
Decimal sign key. Press it to cyclically change the displayed measurement channels
with their recorded runs. It is also used to enter numerical values that require higher
precision (e.g. tenths of a metre when entering the length of the alarm loop).
4.14 “▲” and “▼” keys
The role of the keys with the symbols indicated above depends on the selected
function. Consequently, they are referred to as: right-left; up-down; increase-decrease.
5
5. . M Ma ai in n m me en nu u
The main menu only appears on the screen after you press the “FN” key, and only
when a chart is displayed. The options available in the main menu are specified below.
The digits refer to symbols on the keys.
1 - Kanal (Channel)
2 - Start/Stop
3 - Kalibracja (Calibration) > [haslo] ([password])
4 – Historia (History)
5 – Przebieg roznicowy (Differential run)
6 - Przebieg wejściowy (Input run)
7 – Przebieg odniesienia (Reference run)
8 – Info
5.1 “Kanał” (Channel) option
This option can be used to display measurement information about one of the
monitored sections of the district heating pipeline. To select the channel, enter the
identification code of the channel (digits 1–4; see section 0). The same function is
performed by the decimal sign (“·”) key.
5.2 “Start/Stop” option
The LIM-05 instrument is designed for continuous operation. However, during its
operation, the measurement process may be stopped for an unlimited period. This is
done using the Start/Stop option. The setting is changed to the opposite setting
whenever you press the “2” key. The Start setting activates cyclical measurements.
This is continuously indicated by the “>AUTO<” description displayed in the bottom
right corner of the screen. The Stop setting (measurement interruption) is not indicated
on the screen.
5.3 “Kalibracja” (Calibration) screen
This option can only be used after you enter the password – a preset sequence of digits.
The factory password is “123”. You can use this password to enter the “Kalibracja”
(Calibration) option and replace it with your own password. This option can be used to
set the measurement conditions, e.g. value of the VOP coefficient, length of the alarm
loop, etc.

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5.4 “Historia” (History) option
You can use this option to view the first image of the measurement pulse reflected at
the location of the fault that is recorded in the memory, read the distance to the
location of the fault and the date and time of recording. Use “▲” and “▼” keys to
navigate the memory resources in the “Historia” (History) option.
5.5 “Przebieg roznicowy” (Differential run) option
This option depicts the measurement information, which always has the form of an
annotated chart. In this case, the chart is the graphical difference between two runs:
reference run and input run. The run created and recorded after a short period of
instrument operation at the measurement station is referred to as the reference run.
Every measurement channel (monitored section of the district heating pipeline) has its
own recorded reference run. The input run, in turn, contains information about the last
measurement. The differential run is marked with a description reading: “dif”. The
description is visible in the first row of the text box at the top of the screen (see Fig. 2).
5.6 “Przebieg wejsciowy” (Input run) option
The measurement starts when an electrical pulse is generated and sent to the monitored
alarm system of the district heating pipeline. Starting from this moment, the instrument
records the time of return and shape of all returning pulses (echoes). These data are
recorded in digital form in the input buffer of the locator. The described measurement
process is repeated at preset intervals. The Przebieg wejsciowy (Input run) option
enables presentation of the collected digital data in the form of a chart. These data refer
to the last measurement. When the input run is displayed, the screen will display a
description reading “input”. The description is visible in the first row of the text box at
the top of the screen.
5.7 “Przebieg odniesienia” (Reference run) option
Select this function to display the requested chart for the selected measurement
channel. Every measurement channel (monitored section of the district heating
pipeline) has its own recorded reference run. They are created and recorded during the
initial period of locator operation at the measurement station. Display of the reference
run is indicated by a description reading: “ref”. The description is visible in the first
row of the text box at the top of the screen. The date and time of registration will
appear at the same time in the second row of the screen.
5.8 “Info” option
Select the Info option to display information with, for instance, the name of the
monitored facility, symbol of the installed software version and cause for last reset of
the processor.
6
6. . D De es sc cr ri ip pt ti io on n o of f t th he e K Ka al li ib br ra ac cj ja a ( (C Ca al li ib br ra at ti io on n) ) o op pt ti io on n o of f t th he e
m
ma ai in n m me en nu u
To enter this option from the main menu (FN), press the (3) key. You will be requested
to enter the PIN code. The factory code is 123. You should create your own access
code, which can be any number between 100 and 32000. After you correctly enter the
PIN, you will be able to enter parameters and quantities that determine measurement
conditions. The full list of available entries is included below. The digits refer to the
symbols on the key used to initiate the requested entry.

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1 - Długośćpętli> (Loop length>)
2 – Napięcie progowe U
p
= (Voltage threshold Up =)
3 – Liczba kanałów = (Number of channels =)
4 – Przebieg odniesienia (Reference run)
5 – Czas martwy = (Dead time =)
6 - VOP =
7 - Parametry impulsu> (Pulse parameters>)
8 - Zakres pomiarowy U
zak
= (Measuring range U
zak
=)
9 – Wyświetlenie nastaw (Display settings)
0 - Kod PIN (PIN code)
6.1 “Długość pętli >” (Loop length>) entry
Contents of the discussed entry are presented below.
1 – Długośc pętli>
1 – Między kursorami= (Between cursors=)
2 – Zakres= (Range=)
3 - Autokalibracja (Self-calibration)
T
i
=50ns
▼
▲
U
i
=…mV
▼
▲
During measurements, the measuring range should be adjusted to the measured value.
In the LIM-05 locator, the measuring range is determined so as to ensure that it most
accurately corresponds to the length of the measured sensor wire. The x axis represents
the measuring range and, at the same time, the length of the alarm wire. The beginning
of the x axis has an assigned value x = 0 m, and the length at the end of the axis (end
of the measuring range) should be equal to the length of the monitored sensor wire.
The presented method of calibration of the x axis enables obtaining the highest
possible measuring resolution. The calibration method also ensures that the image
corresponds to reality. For instance, if a fault occurs near the end of the network, it will
be represented near the end of the x axis and not, for instance, in the centre of the axis.
Instrument calibration relating to determination of the length measuring range is done
in two ways after entering the “Długość pętli>” (Loop length>) option. The names and
description of each of these options are specified below.
METHOD 1
3 - Autokalibracja (Self-calibration)
Before initiating the procedure, make or break the end of the alarm system. For
instance, remove the port plug from the box at the end of the sensor wire (breaking).
Next, set the duration T
i
and amplitude U
i
of the measurement pulse. After you
complete these actions, press the (3) key and wait (in older versions of the locator, this
can take up to several minutes), until the instrument “locates” the end of the sensor
wire on its own. Once the procedure is complete, the screen of the LIM-05 instrument
will display the echo voltage function for the entire sensor wire. If necessary, adjust
the position of the K2 cursor so that it is located at the beginning of the measurement
pulse reflected from the end of the sensor wire. Next, eliminate the make/break at the
end of the line, enter option 1-Między kursorami=(1 – Between cursors =) in the
Kalibracja / Długość Pętli (Calibration / Loop length) menu and enter the known,
accurate length of the sensor wire.

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If the LIM-05 instrument is unable to automatically “locate” the end of the wire for
any reason, conduct the calibration described in section 0 of this manual.
METHOD 2
The specific procedure is described in section 8.1.
Note: A new reference run should be created and recorded after changing the physical
length of the sensor wire. (See section 6.4 i 0).
6.2 “Napięcie progowe Up=” (Voltage threshold Up=) entry
Input signals whose voltage amplitude is within the ±Up range are not analysed. This
limitation can be used to eliminate some of the low-amplitude interference appearing
in the alarm system of the district heating pipeline. The ±Up voltage range can be set
separately for each measurement channel.
6.3 “Liczba kanałów=” (Number of channels =) entry
The instrument can monitor up to four sensor loops. The entered number (1–4)
specifies the number of monitored sections of the district heating pipeline with the
alarm system. (See section 0). If the number of connected loops is smaller, they have
to be connected to subsequent measurement ports of the instrument starting from the
outermost left port (channel 1).
6.4 “Przebieg odniesienia” (Reference run) entry
Activating this function will force a specific measurement cycle in the selected
measurement channel. The instrument will calculate the average value of measured
results i, which will be recorded as the reference run. (See section 0).
6.5 “Czas martwy=” (Dead time=) entry
The automatic measurement cycle of the fault locator consists of measurements carried
out for every section of the district heating pipeline. The measurements are carried out
sequentially. Between the measurement cycles, there is a gap referred to as the dead
time. The dead time can be adjusted in the range of 1–255 min. (See section 0).
6.6 “VOP=” entry
This entry enables setting the VOP coefficient for all measurement channels in use. It
may be a fraction in the range of 0.3–1.0 or a value expressed as percentage from 30 to
100%. (See section 0).
The factory setting is: VOP = 0.92. In practice, the coefficient is set as 0.84–0.93 for
measurements of district heating pipelines.
6.7 “Parametry impulsu>” (Pulse parameters>) entry
The amplitude in [V] and duration in [ns] of the measurement pulse can be set for
every measurement channel. Both of these values are selected depending on the length
of the monitored district heating pipeline (length of the monitored sensor wire).
“1-czas trwania =” (1 – duration =) – duration of the measurement pulse is changed
with keys marked with “▲” (increase) and “▼”(decrease) symbols. The changes are
implemented in a stepwise fashion, at 12.5-ns intervals within a range of 12.5–75 ns.
“2-amplituda impulsu =” (2 – pulse amplitude) – the amplitude of the measurement
pulse can be changed within a range of 2.3–7.8 V (4.8–14.6 V for amplitude of the
voltage of the measurement pulse generator) using keys marked with “▲” (increase)
and “▼”(decrease) symbols.

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Note: The reference run should be created and recorded whenever the duration or
amplitude of the measurement pulse are changed. (See section 6.4 i 0).
6.8 “Zakres pomiarowy Uzak=” (Measuring range Uzak=) entry
The range of voltage measured by the fault locator is ±2047 mV. If you enter 100 mV,
the measuring range will be set to ±100 mV. Optimum setting: ± 500 mV. This setting
can produce a clear image of the leak immediately after it occurs (after it is recorded)
and in the initial stages of its development. The shape of the reflected pulse will be
represented within the range of voltage thresholds determining the measuring range.
Extending the voltage measuring range will affect duration of the measurement cycle.
Note: The reference run should be created and recorded whenever the measuring range
is changed. (See section 6.4 i 0).
6.9 “Wyświetlenie nastaw” (Display settings) function
Use this function to display the list of entries of the Kalibracja (Calibration) function
complete with all defined values of parameters and quantities.
6.10 “Kod PIN=” (PIN code=) entry
A PIN code will be needed to access the Kalibracja (Calibration) option. The Kod
PIN= (PIN code=) entry is used to set and record the code. (See section 0).

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7
7. . S Se et tt ti in ng gs s r re eq qu ui ir ri in ng g a a P PC C
Implementation of certain settings in the LIM-05 locator requires using a computer
with suitable software, e.g. HyperTerminal. Both devices are connected with an RS232
transmission cable (three-wire crossover cable). The cable has to be terminated on both
sides with female connectors. The RS232 port is located on the front panel of the
locator. In order to ensure correct communication, the following transmission
parameters should be set in the computer:
57600,8,N,2
-transmission rate = 57600 bps
-number of bits = 8
-no parity
-number of stop bits = 2.
After you finish entering the settings, press the ENTER key on the computer. The
computer screen should display the following message:
LIM-05>
Absence of this message means that there is no communication between the computer
and the locator. In such a situation, make sure that the devices are correctly connected
and check the status of the selected COM port. You can enter the settings once the
“LIM-05>” message appears.
7.1 Setting the time
In order to set the time in the locator, enter the following command on the screen of
the terminal:
czas hh:mn:ss
where:
hh – hours
mn – minutes
ss – seconds.
Example: setting the time as 12 hours, 33 minutes and 30 seconds.
Type the following command on the computer screen: czas 12:33:30.
Press the ENTER key on the computer keyboard. The LCD of the locator should
display the requested time.
7.2 Setting the date
In order to set the date, enter the following command on the terminal screen:
data rrrr/mm/dd
where:
rrrr – year
mm – month
dd – day.
Example: setting the date as 2006/10/11.
Type the following command on the computer screen: data 2006/10/11.
Press the ENTER key on the computer keyboard. The LCD of the locator should
display the requested date.

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7.3 Entering the locator name
The instrument is frequently made identifiable by being assigned the code, name or
address of the measurement station. In order to check or change the existing name,
enter the main menu (FN key) and access the “Info” option (“8” key). This will display
the existing name. The name will be presented in the first line of the LCD.
To enter a new name, type the following command on the computer screen:
Nazwa =..name..
where:
..name.. – string of up to 20 alphanumeric characters (without Polish letters; you can
use the “Backspace” key)
Example: entering the name of the locator by typing the address of the measurement
station: ul. Poleczki 5
Type the following command on the computer screen: Nazwa = Poleczki 5
Press the ENTER key on the computer keyboard.
To verify if the name has been correctly entered, access the “Info” option in the main
menu. If the entered name is longer than 20 characters, the name of the instrument will
consist of the first 20 characters.
8
8. . P Pr ro oc ce ed du ur re e e ex xa am mp pl le es s
Below, there are several examples with practical instructions on how to conduct some
of the procedures discussed in this manual. All operations should be initiated only after
the locator screen displays the run.
Calibration procedure: Kalibracja (Calibration) option; Długość
pętli (Loop length) entry
Note: Locator calibration should be carried out 30 minutes after the device is turned
on. This is the time necessary for the technical conditions inside the instrument to
stabilise.
The following commands are described as separate instructions. Therefore, almost
every one of them starts with entering the main menu (FN), and ends with
leaving by pressing the ESC key multiple times. In practice, for instance if
several subsequent commands to be performed are included in the Kalibracja
(Calibration) option, there is no need to leave this group after each command.
Enter the commands one after the other and leave after you complete the last one.
The same is true for leaving the main menu (FN). We believe that as you use the
instrument, everything will become clear.
During calibration, it may turn out that the amplitude of the reflected measurement
pulse is too small to correctly implement the command. In such a situation, use
the Kalibracja/Parametry impulsu> (Calibration/Pulse parameters>) option to
increase the amplitude of the measurement pulse. As a last resort, you can also
increase the duration of the pulse.
We remind that the factory PIN code is 123.
1. Place the 67LV23 port plugs on the ends of the monitored alarm loops in 67LV15
boxes.
2. Disable automatic measurements.
FN-> (2)
3. Set the number of monitored alarm systems.

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FN-> (3) -> enter PIN -> (3) -> enter the number of
monitored alarm systems [1...4] -> ENT -> wait 2 s ->
ESC -> ESC
NOTE: If the number of monitored alarm systems is lower than 4, connect them
to subsequent measurement ports of the instrument starting from the outermost
left port (channel 1).
4. Enter the number of the measurement channel to be calibrated.
FN -> (1) -> enter channel number [1...4] -> ENT
5. Enter the known VOP (see 0) or leave the factory-set value: VOP = 0.92.
FN-> (3) -> enter PIN -> (6) -> enter VOP in form of
percentage (30–100)or fraction (0.300–1.0] -> ENT ->
wait 2 s -> ESC -> ESC
6. Calculate the approximate length of the alarm loop:
1) Enter the length)* of the sensor wire greater by 20 to 30% from the actual
length.
FN -> (3) -> enter PIN -> (1) -> (2) -> Enter length
->
-> ENT -> wait 2 s -> ESC -> ESC-> ESC
)* The as-built documentation should specify the precise length of the monitored alarm loop. However,
sometimes this length is known only approximately. Whatever the case, it is recommended to first enter a
length greater by 20 – 30%.
2) Create and record a reference run.
FN -> (3) -> enter PIN -> (4)
The screen will display the chart – straight line (x axis).
3) Simulate a break in the alarm system at the end of the district heating pipeline.
To do so, remove the 67LV23 port plugs from the 67LV15 box. Perform a
measurement by pressing the “7 PING” key. The chart will display an image of
the reflected measurement pulse from the end of the district heating pipeline
(location of the simulated fault).
The length of the section of the x axis visible on the chart does not reflect the actual length of the alarm
wire. In section 3, increased length of the line was specified precisely in order to ensure that the image of
the measurement pulse reflected at the end of the network “ fits ” in the chart. The length of the x axis on
the chart should correspond to the actual length of the alarm wire in order to obtain maximum possible
resolution of the screen of the monitored network. Also, if a fault occurs near the end of the network, it
should be represented near the end of the chart (x axis) and not, for instance, in the centre of the chart in
order to ensure that the image is fully consistent with the actual situation.
4) Set the K2 cursor at the beginning of the image of the reflected measurement
pulse.
Press the “6 K2” key -> shift the K2 cursor with
“▲”(left) or „▼”(right) keys
8) Enter the actual length of the alarm wire, including the “electrical length” of
the connection cable. If the actual length is unknown, enter the value displayed
next to the K2 cursor. The instrument will automatically calculate the VOP for
the actual length. It will be recorded in the memory. The factory value VOP =
0.92 or the value set by the operator will be used in the calculations (location)
for the approximate length.
FN -> (3) -> enter PIN -> (1) -> (1) -> enter the
known length including the connection cable or copy
the approximate value specified next to the K2
cursor -> ENT -> wait 2 s -> ESC -> ESC -> ESC
The length measuring range will correspond to the length of the monitored sensor wire. This will provide
the highest possible measuring resolution. The x axis simultaneously represents the measuring range and
the length of the monitored sensor wire.

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9) Place the 67LV23 port plug in the 67LV15 box at the end of the district
heating pipeline.
10)Stop the measurements. Create and record a reference run.
FN -> 2 -> FN -> (3) -> enter PIN -> (4)
7. Repeat items 1) to 10) for every measurement channel in use. (See sections 6.3
and 0)
8. Set the dead time (interval between measurement cycles). Recommended time:
10 min.
FN -> (3) -> enter PIN -> (5) -> specify dead time:
1...255 min. -> ENT -> wait 2 s -> ESC -> ESC -> ESC
9. Activate automatic measurements.
FN -> (2)
Channel number entry
FN -> (1) -> enter channel number (digit from 1 to 4) ->
ENT
Initiate or stop automatic measurements
FN -> (2)
Initiation of automatic measurements is indicated by the >AUTO< description. It will
appear in the bottom right corner of the screen. Stopping automatic measurements will
cause the description to disappear. The setting is changed whenever you press the (2)
key.
Creating and recording the reference run
FN -> (3) -> enter PIN -> ENT -> (4)
Enter the new length of the alarm loop
FN -> (3) -> enter PIN -> ENT -> (1) -> (2) -> enter new
length -> ENT -> (wait 2 s) -> ESC -> ESC
Create and record a reference run after this operation.
(FN -> (3) -> enter PIN -> ENT -> (4))
Changing the number of monitored alarm systems
FN -> (3) -> enter PIN -> ENT -> (3) -> enter the number
of monitored channels [1...4] -> ENT -> (wait 2 s) -> ESC
-> ESC
Changing the VOP
FN-> (3) -> enter PIN -> EN -> (6) -> enter VOP in form of
percentage (30–100)or fraction (0.30–1.0) -> ENT -> (wait
2 s) -> ESC -> ESC
Changing the PIN
FN -> (3) -> enter PIN -> ENT -> (0) -> enter new PIN ->
ENT -> (wait 2 s) -> ESC -> ESC
Displaying the input run
FN -> (6)

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Displaying the differential run
FN -> (5)
Changing the dead time
FN -> (3) -> enter PIN -> ENT -> (5) -> enter the dead
time: 1...255 min -> ENT -> (wait 2 s) -> ESC -> ESC
9
9. . D De es sc cr ri ip pt ti io on n o of f t th he e o op pe er ra at ti in ng g e en nv vi ir ro on nm me en nt t o of f t th he e L LI IM M- -0 05 5
i
in ns st tr ru um me en nt t
The instrument is designed for indoor operation. The instrument operates correctly within an
ambient temperature range of +5°C to +50°C, and relative humidity should not exceed 80%.
During storage of the instrument, the ambient temperature should be within the range of
-40°C to +70°C. If the instrument was stored or transported at a temperature of less than
+5°C, it should not be connected to power supply for at least 3 hours. After this time, the
instrument should reach the operating temperature. The instrument cannot be used in dusty
areas and in atmospheres containing explosive or corrosive gases.
The accuracy of measurements of parameters and quantities indicated in the technical
specifications is reached after 30 minutes of instrument operation in suitable environmental
conditions.
1
10 0. . M Ma ai in nt te en na an nc ce e o of f t th he e L LI IM M- -0 05 5 i in ns st tr ru um me en nt t
A clean, dry cloth should be used to remove dust from the housing of the instrument. Other dirt should
be removed with a cloth dampened with a 1% detergent solution. Greasy impurities can be removed
with special products used to clean computer hardware. Transparent parts of the housing should be
washed with soft cloths or with dedicated cloths for washing computer screens. Using spirit, petroleum
naphtha or other solvents is not allowed. Such cleaning agents may cause surface damage to the
housing of the instrument. After cleaning, the instrument should be wiped dry with a soft cloth. Care
should be taken during cleaning to prevent large amounts of the cleaning liquids from getting inside
the instrument.
1
11 1. . D Di is sp po os sa al l o of f t th he e L LI IM M- -0 05 5 i in ns st tr ru um me en nt t
In accordance with the Act of 29/7/2005 on waste electrical and electronic equipment (Journal
of Laws, item 1495), the following symbol has been placed on the instrument:
This symbol means that it is prohibited to discard waste equipment together with any other
waste. Users of equipment marked with this symbol are obliged to transfer it to dedicated
companies that collect waste equipment. These obligations arise from Articles 35 and 36 of
the above-mentioned act.

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1
12 2. . T Te ec ch hn ni ic ca al l s sp pe ec ci if fi ic ca at ti io on ns s
Number of monitored alarm loops.................................................................................4
Maximum length of the alarm wire .......................................................3518 m · VOP)
1
Location measurement resolution............................................................±0.23 m · VOP
Range of VOP values................................................................0.300–1.000 (30–100%)
Location error...........................................................................................................±1 m
Input impedance of the instrument ........................................................................200 Ω
Indication of faults................................................................... red LED (every channel)
Measurement pulse characteristics:
Duration ...............................................................................12.5 ns, 25 ns, 50 ns, 75 ns
Voltage amplitude (unloaded output) ..........................................adjustable: 4.8–14.6 V
Method of measurement information display.................... LCD screen, 128x240 pixels
Method of presentation of measurement results......................................annotated chart
Method of instrument programming.................................... 16 numerical/function keys
Voltage measuring range ................................................................................±2047 mV
Maximum measurement sensitivity...............................................................1 mV/pixel
Sensitivity threshold voltage range...............................................................1–1024 mV
Dead time range..............................................................................................1–255 min
Methods of communication with external devices:
Alarm output.............................................. volt-free relay contacts (capacity 1 A/60 V)
Digital transmission............................................................................................RS232C
Radio transmission (optional)............................................... GSM transmission module
Supply voltage .............................................................................................230 V 50 Hz
Power drawn from the power supply network............................................... up to 6 VA
Operating temperature range...........................................................................0 to +50°C
Relative humidity.............................................................................................up to 80%
Housing protection rating ........................................ IP54 (IP65 available upon request)
Electrical protection of measuring inputs ............................................. 250 V (AC+DC)
Appliance class ............................................................................................................. B
Dimensions ...................................................................... 262 mm x 235 mm x 143 mm
)
1
– (VOP) speed of propagation of the measurement pulse in the alarm wire in relation to the speed of light
propagation in vacuum. This value is specified in percentage (from 0 to 100%) or in relative quantities (from
0.00 to 1.00).
EZUP “LEVR” s.c.
03-193 Warsaw
ul. Krzyżówki 5
tel./fax: [phone]
e-mail: [email protected]
www.levr.pl