levr ACN-2Z User manual

STATIONARY FAULT DETECTOR
FOR PREINSULATED DISTRICT HEATING PIPELINES
(PULSE ALARM SYSTEM)
ACN-2Z
USER MANUAL
Elektroniczny Zakład Usługowo-Produkcyjny
“LEVR”
0 -19 Warsaw
ul. Krzyżówki 5
Ver. 17.12

ACN-2Z USER MANUAL
General
The ACN-2Z stationary detector is designed to monitor the condition of two sections of a
preinsulated district heating pipeline with a pulse alarm system. Every section can have a
length of up to 2000 m along the sensor wire.
The technical re uirements for alarm systems specify the minimum resistance of
polyurethane insulation for the maximum length of a preinsulated district heating pipeline.
If the measured resistance is lower than the minimum value, this indicates a leak/moisture.
The ACN-2Z instrument identifies and separately indicates three conditions for each
monitored section of the district heating pipeline. The names and descriptions of these
conditions are provided below.
•STAN DOBRY (GOOD
CONDITION)
(green LED)
Insulation resistance between the carrier pipe and
the copper wire exceeds the minimum level. The
alarm system is in good condition.
•PRZECIEK (LEAK)
(red LED)
Insulation resistance between the carrier pipe and
the copper wire is lower than the minimum value.
The alarm system is undamaged.
•PRZERWA (BREAK)
(red LED)
There is an electrical break in the alarm system of
the monitored district heating pipeline.
The ACN-2Z instrument can be provided with an ACNMT or ACNRS module to enable
digital data transmission. This enables sending information about the condition of the district
heating pipeline and the alarm system to data ac uisition devices. This information includes
the uni ue number of the module, number of the monitored section of the district heating
pipeline and condition code (good, leak, break).
Operating notes
The ACN-2Z instrument has been designed in accordance with the assumption that
resistance measured between the copper wire and the carrier pipe is within 50–550 Ω if there
is a leak. This is indicated by the continuous illumination of the red LED reading
“PRZECIEK” (LEAK). When the same LED is blinking, this indicates direct contact (short
circuit) of the copper wire with the steel pipe. The short circuit resistance range is 0–50 Ω. A
short circuit prevents detection of an electrical break in the alarm system outside of the
location of the short circuit.
The ACN-2Z detector can activate an external alarm device (audible or light alarm) in case
of a fault (short circuit, leak, break). The actuating component of the device is the relay.
Contacts of the relay are connected to an external port marked with the “Alarm” description.
The same connector is used for digital data transmission. Only one of the options can be used
at the same time.
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ACN-2Z USER MANUAL
Fig. 1. Status of “Alarm” connector contacts
Status of relay contacts Status of relay contacts
for the GOOD CONDITION signal for the FAULT signal
(Two green LEDs are lit) (At least one red LED is lit)
The ACN-2Z detector is a two-channel device. If only one measurement channel is used,
the measurement input of the other channel should be closed with a special port plug
(No. 66LV72).
Fig. 2. Connection of the ACN-2Z detector with a single alarm loop
The connections are made using 67LVxx coaxial cables.
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ACN-2Z USER MANUAL
Fig. . Connection of the ACN-2Z detector with two alarm loops
The connections are made using 67LVxx coaxial cables.
Description of the operating environment of the ACN-2Z
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 uantities indicated in the technical
specifications is reached after 30 minutes of instrument operation in suitable environmental
conditions.
Cleaning the ACN-2Z 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 li uids from getting inside the
instrument.
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ACN-2Z USER MANUAL
Periodic inspections of the ACN-2Z instrument
Verification tests should be conducted every 2 years to check if the instrument operates
correctly. The tests should be carried out as follows:
1. Disconnect the measurement cables from the ports of the instrument marked:
“KANAŁ 1” (CHANNEL 1) and “KANAŁ 2=” (CHANNEL 2).
2. Screw 66LV72 port plugs (2 pieces) into the ports marked: “KANAŁ 1”
(CHANNEL 1) and “KANAŁ 2” (CHANNEL 2). Two green LEDs should turn
on within three minutes to indicate good condition. The contacts of the
“Alarm” connector should have the status depicted in figure 1 on page 3.
3. Screw 66LV72T port plug (2 pieces) into the ports marked: “KANAŁ 1”
(CHANNEL 1) and “KANAŁ 2” (CHANNEL 2). Four red LEDs should turn
on within three minutes to indicate a leak and a break. The contacts of the
“Alarm” connector should have the status depicted in figure 1 on page 3.
After the measurement, connect the cables connecting “KANAŁ 1” (CHANNEL 1) and
“KANAŁ 2” (CHANNEL 2) measurement ports of the instrument with the alarm system of
the district heating pipeline.
Disposal of the ACN-2Z instrument
In accordance with the Act of 29/7/2005 on waste electrical and electronic e uipment
(Journal of Laws, item 1495), the following symbol has been placed on the instrument:
This symbol means that it is prohibited to discard waste e uipment together with any other
waste. Users of e uipment marked with this symbol are obliged to transfer it to dedicated
companies that collect waste e uipment. These obligations arise from Articles 35 and 36 of
the above-mentioned act.
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ACN-2Z USER MANUAL
ACN-2Z
(pulse alarm system)
TEC NICAL SPECIFICATIONS:
1. Number of monitored sections of the district heating pipeline..........................................................................2
2. Maximum length of monitored sections of the district heating pipeline.................................................2000 m
3. Minimum polyurethane insulation resistance..................................preset: 100 Ω–550 Ω at 50-Ω increments*)
4. Polyurethane insulation resistance measuring accuracy.............................................................................±10%
5. Signal description:
 Polyurethane insulation resistance between the copper LEDs, green
wire and the carrier pipe exceeds 550 Ω.....description: “STAN DOBRY” (GOOD CONDITION)
The alarm system is in good condition...............................................................................................
 Polyurethane insulation resistance between the copper LEDs, red
wire and the carrier pipe does not exceed 550 Ω.......................................................continuously lit
The alarm system is in good condition......................................description: “PRZECIEK” (LEAK)
 Direct contact of the copper wire with the carrier pipe LEDs, red
Measured resistance is lower than 50 Ω. blinking
description: “PRZECIEK” (LEAK)
 There is an electrical break in the alarm system of the LEDs, red
monitored district heating pipeline. continuously lit
description: “PRZERWA” (BREAK)
6. 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..........................................................................................................................................120 V
– DC............................................................................................................................................24 V
Connection power.........................................................................................24 W (DC); 60 VA (AC)
Maximum continuous load current....................................................................1 A (DC); 0.5 A (AC)
7. Method of communication with data ac uisition systems:
Status of relay contacts (NC; NO; COM)......................................................................ALARM port
8. Current draw...........................................................................................................................................0.75 VA
9. Power supply...................................................................................................................................230 V 50 Hz
10.Operating temperature range.............................................................................................................5 to +50°C
11.Relative humidity................................................................................................................................up to 80%
12. Housing protection rating...........................................................................................................................IP54
13. Appliance class................................................................................................................................................B
14. Dimensions.....................................................................................................................................180x160x60
15. Instrument weight.....................................................................................................................................850 g
*) Factory setting: 550 Ω
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