levr LPS-2 User manual

STATIONARY FAULT DETECTOR
FOR PREINSULATED DISTRICT HEATING
PIPELINES
(pulse or resistance system)
LPS-2
USER MANUAL
Elektroniczny Zakład Usługowo-Produkcyjny
“ LEVR ”
03-193 Warsaw
ul. Krzyżówki 5
Ver. 17.12

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1. General
The LPS-2 stationary detector is designed to monitor the condition of two sections of a
preinsulated district heating pipeline with a pulse or resistance alarm system. The type of the
system should be specified in the order. The LPS-2 instrument identifies and indicates the
following three conditions of the monitored district heating pipeline sections.
•STAN DOBRY Two sections of the monitored district heating pipeline are
(GOOD CONDITION) in good condition.
(green LED)
•STAN ZAGROŻENIA In at least one of the monitored conditions of the district heating
(DANGER) network, the resistance between the alarm wire and the steel pipe
(yellow LED) is close to the defined leak resistance threshold. Alarm systems
of the two monitored district heating pipeline sections are in
good condition.
•AWARIA (FAULT) At least one of the following
(red LED) situations has occurred:
•leak
•no electrical contact between the detector and the steel pipe
•electrical break in the alarm circuit
•electrical short circuit between the alarm wire and the steel
pipe.
Measurement ports located on the side panels of the instrument enable accurate
measurements for every section of the monitored district heating pipeline. Measuring
instruments should be selected in accordance with the type of the monitored alarm system.
In case of a fault, the LPS-2 detector will activate an external alarm device (audible or
light alarm) or communicate information to data acquisition devices. In both cases, the
actuating component is the relay whose contacts are connected to the connector with the
“ ALARM ” description.
2. Operating notes
The LPS-2 instrument can be connected directly to the ZPB connector.
To connect the LPS-2 detector, insert the plug of the power cable into the socket of a 230 V
50 Hz system. Then, within approx. 1 min, the instrument will perform internal set-up and
conduct the first measurement. During this time, the red LED with the “ AWARIA ” (FAULT)
description will blink. Next, depending on the result of the first measurement, one of the
following three LEDs should lit up continuously: green, yellow or red.
The chapter titled TECHNICAL SPECIFICATIONS describes the types of characteristic
conditions of the preinsulated district heating pipeline for a resistance and pulse alarm system
and methods used by the LPS-2 instrument to indicate these conditions. If the yellow LED
lights up, the supervising employee should increase the frequency of observations carried out
with the LPS-2 instrument. If a fault is indicated (the red LED lights up), determine the type
and location of the fault using suitable instruments. If you connect a measuring instrument to
one of the external ports of the detector, the LED indicating the condition of the monitored
alarm system will start lighting up in a different fashion. If, for instance, the yellow LED
(DANGER) was lit up continuously before connecting the meter, it will start to blink after the

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meter is connected. The description indicates that connection of instruments to external
measurement ports does not require unplugging of the LPS-2 detector from the 230 V 50 Hz
power source.
Figures 3 and 4 depict examples of connections of the LPS-2 detector with a resistance alarm
system. The pulse system is connected in a similar fashion. However, the copper wires of the
sensor loops are connected to the ports referred to as NiA and NiB.
Fig. 3. Method of connecting wires of two alarm loops with a total length of up to 1000 m
blue and black
blue and black
ME2019TK4 (SL4)
green
red
ZPB (RFA)
ALARM
NC contact Power supply
24 V≈

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Fig. 4. Method of connecting alarm loop wires with a length of up to 1000 m
3. Description of the operating environment of the LPS-2
instrument
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.
4. Maintenance of the LPS-2 instrument
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.
Power supply
24 V≈
ALARM
NC contact
blue and black
blue and black
green
green
red
red
jumpers

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5. Periodic inspections of the LPS-2 instrument
The instrument is designed for continuous operation. In order to verify correct operation of the
instrument, conduct test measurements of the monitored district heating pipeline with a
portable tester connected to the external measurement ports of the LPS-2 instrument at least
once a year. The condition indicated by the LEDs should be confirmed by the results of the
measurements.
6. Disposal of the LPS-2 instrument
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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LPS-2
(resistance or pulse alarm system)
7. TECHNICAL SPECIFICATIONS:
1. Total length of the monitored district heating pipeline.........................................................................≤2000 m
2. Signal description:
•polyurethane insulation resistance:............................................................................................. LED, green
— resistance system: R
i
> 3 MΩDescription: STAN NORMALNY (NORMAL)
— pulse system: R
i
> 300 kΩ)
alarm systems are undamaged
•polyurethane insulation resistance:............................................................................................LED, yellow
— resistance system: R
i
= 1–3 MΩDescription: STAN ZAGROŻENIA (DANGER)
— pulse system: R
i
= 65–300 kΩ)
alarm systems are undamaged
•polyurethane insulation resistance:.................................................................................................LED, red
— resistance system: R
i
< 1 MΩDescription: AWARIA (FAULT)
— pulse system: R
i
> 65 kΩ)
and/or no electrical contact between the detector and the steel pipe
and/or electrical break in the sensor loop
and/or electrical short circuit between the sensor wire and the steel pipe.
3. Polyurethane insulation resistance measurement error............................................................................. ±10%
4. Description of the “ALARM” output used to control an external alarm device:
•contacts are open in case of the “AWARIA” (FAULT) status or power outage.
•acceptable contact voltage:
– AC 30 V
– DC 24 V
•connection power..................................................................................................30 W (DC); 60 VA (AC)
•maximum continuous load current.............................................................................1 A (DC); 0.5 A (AC)
5. Power supply..................................................................................................................................... 24 V 4 VA
6. Housing protection rating............................................................................................................................IP65
7. Operating temperature range............................................................................................................. +5 to 50°C
8. Relative humidity............................................................................................................................... up to 80%
9. Dimensions........................................................................................................................................170x80x55
10. Weight.........................................................................................................................................approx. 520 g
Note:
Descriptions on the front panel of the LPS-2 instrument may be provided in a different
language upon request.