EAD LP-LPD User manual

Water Sensing Cable
LP-LPD Water Leak Locating Panel Quick Start Guide Page 1of 10
LP-LPD Water Leak Locating Panel
Quick Start Guide
General Note
To ensure normal operation, please follow thru various instructions listed in this manual.
The LP-LPD water leak locating panel is designed to detect liquid leak of the sensing cable up to 900m.
Once liquid leak is detected, the LP-LPD water leak locating panel gives an audible and visual alarm, also,
a 7-Segment LED will indicate the leak location and the relay output is energized. The communication
Protocol of LP-LPD water leak locating panel is Modbus RTU which is easy to interface with BMS
systems.
LP-LPD can be either stand alone or interfacing with the BMS system.
Its application includes Data Centre, Warehouse, library, museum and so on.
Product Features:
•LED light shows Power, Leak, Cable Fault, and Communication Status
•The LED display shows leak location and cable fault.
•32 leak alarm records can be stored
•Serial RS-485 communication Port with Modbus Protocol
•12V DC power supply.
•NO/NC Relay output is available
•Din rail installation
•86*70*58 mm in size

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Technical specification
Basic Features
Maximum length of sensing cable
900 m
Accuracy
0.5% of the length of sensing cable ± 0.5 m
Ambient
Storage temperature
-40 ℃ ~60 ℃ (0 ℉~ 140℉)
Operating temperature
0℃ ~45℃ (32 ℉ ~ 117℉)
Humidity
5%~95% (Non-condensing)
Power Requirements
LP-LPD
12VDC, 3W
Serial Interface
Network Configuration
RS-485Serial port; different baud rates are
available, and the factory default is 9,600; the
address is from 0 through to 255, and the factory
default is 0
Communication Protocol
MODBUS RTU
Relay contact
Function
NO/NC contact for leak and sensor fault alarm
Ratings
DC24V, 1A.
(3.39 inch)
(2.76 inch)
(2.28 inch)

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LP-LPD Installation
Choosing Installation Location
The panel should not be installed in any improper environment, temperature limits or severe vibration.
LP-LPD can be installed in 35 mm DIN rail. Also, IP54 housing is available to the panel. The maximum
allowable sensing cable is 900m. If it is over 900m, please consult the manufacturer.
Important: The LP-LPD panel is an electronic
device. Please take the caution below
Handle with care and avoid mechanical
shock and impact.
Keep dry.
Avoid electrostatic discharge to the panel
Prevent the contact with metal filings,
grease, pipe coatings and other
contaminants.
Installation Diagram
Installation of LP-LPD
• Install the 35mm Din rail in appropriated flat wall.
• Directly install the LP-LPD panel into the Din rail.
Connection between Power Cable and Communication Cable
All LP-LPDs are designed with an inbound cable (from the monitoring host system) and an outbound cable
(to the next LP-LPD). Connect the DC12V power supply (two DC terminals); the PE terminal is power
ground that can be connected to achieve favorable immunity from interference. The detailed wiring method
is shown in the figure below.
Power +/-
Communic
ation cable
Ground wire

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Connection of Alarm Relay
The relay output of LP-LPD can be used for local or remote alarm, it can also be used as an digital signal
for any BMS system.
Wiring Combination
Alarm Status
Output State
N.O. —COM
No alarm
Open
Alarm
Closed
Loss of power
Open
N.C. —COM
No alarm
Closed
Alarm
Open
Loss of power
Closed
Connection of Lead-out Wire of Leak Sensing Cable
LP-LPD can be used with WS-Lxx leak sensing cable. The leak sensing cable is connected as shown in the
following figure.
Power +/-
Communic
ation cable
Groun d wire

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Operating Instructions for System Configuration
Setup of Device Address and Baud Rate
If LP-LPD is integrated into the monitoring system, LP-LPD panel must be assigned address. The factory
default address of all LP-LPDs is 0 and its baud rate is 9,600.Each LP-LPD must be an unique address and
same communication baud rate.
Please follow the steps below to set address of LP-LPD:
Power on LP-LPD, then turn the communication cable into RS232 signal vial RS485, and connect
it to the designated PC.
Launch the configuration software as shown in the following:

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LP-LPD Water Leak Locating Panel Quick Start Guide Page 6of 10
Choose the corrected serial port No., baud rate and address, and click "Connect Serial Port" to connect
PC to LP-LPD communication. Then enter the desired baud rate and new address into "New Baud
Rate" and "New Address" as well as click "Settings" respectively. When the baud rate and
communication address are successfully set up, it means the setup is finished. It is worth noting that
the settings will not change unless the LP-LPD is restarted after setup of the new baud rate.
Modbus Address table
Default Setting: ID:1 , Baud Rate 9600, 8N1
03 Holding Register(HEX)
Address
Description
Details
40001
System Status
0x0000 = Normal
0x0001 = Leak
0x0002 = Break
40002
Leak Distance
0xFFFF = No Leak
0x0000 = Leak Distance
Sample:
0x0020 = Leak at 2M

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Parameters Setup for Leak Sensing Cable
Since the electrical parameters of leak sensing cable be varied , the electrical parameters of various leak
sensing cables need to be set in the steps below:
Connect the leak sensing cable to the termination; take measurement of the resistance between the
yellow and black cables with the "ohms range" of multimeter after the connection between lead-out
wire and leak sensing cable.
Enter the length of connected sensing cable into "Length of Sensing Cable", and click "Write" to
set the length of connected sensing line in the LP-LPD module; enter the resistance of sensing
cable determined with a multimeter into "Black-line Resistance of Sensing Cable", and click
"Write".

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Clock Setup for LP-LPD
As shown in the figure below, click "Read System Time" to read and indicate the current computer system
time in the clock display box; click "Write into Module" to write the time in clock display box into the
LP-LPD module; click "Read Module Time" to read the time of LP-LPD module and then indicate it in the
clock display box. You can also enter the desired time into the clock display box and click "Write into
Module" to correctly set the LP-LPD time.
Maintenance & Troubleshooting
Each Panel is well tested before shipment.
State Display
The LP-LPD is equipped with 5 LEDs that respectively indicate power supply, communication (RX =
RECEIVE, TX = TRANSMIT), detected leak, and fault of sensing cable.
When LP-LPD is powered on and runs properly, the red power LED is ON; Table 1 shows various status of
sensing cables and the corresponding possible corrective actions. Table 2 shows various communication
status (ideal for LP-LPDs in the connected network system)

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Table 1. LED Indication of the Running Status of LP-LPD
Power indicator (red)
ON
Normal power-on
OFF
Abnormal power or fault of LP-LPD
Disconnection
indicator (green)
ON
Fault or improper connection of leak sensing cable
OFF
Proper connection of leak sensing cable
Leak indicator
(green)
ON
Leak
OFF
There is no leak
Table 2. LP-LPD Communication Status Indication
TX (TRANSMIT)
RX (RECEIVE)
State
Flash
Flash
The LP-LPD normally communicates with Master
OFF
Flash
The LP-LPD receives information from the Master and no
message back
OFF
Normally ON
The RS485 communication cable is reversely installed or the
communication chip malfunctions
OFF
OFF
The LP-LPD does not communicate with the master
Liquid leakage is detected when there is no obvious liquid presence. The possible reasons are as
follows (it is highly recommended to replace the affected section):
1. The sensing cable was badly contaminated by some chemical for unknown reason.
2. The sensing cable was coated with glue, epoxy and paint accidentally.

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3. The 2 black sensing wires are in contact or not isolated properly.
Some leakage is difficult to be observed due to very small volume of liquid presence and the
environment is too dark.
Cable break is detected where no visible wire cut externally is observed:
Check the 4 wires continuity by a multi-meter.
Check the 4 connection points of the leader cable to the control panel are secured properly.
If leak location is not accurate:
This may probably due to small amount of liquid still exists at different points on the sensing cable.
Also, it can be due to some contamination with electrostatic dust, transparent chemical or glue
deposited on the cable.
Clean the cable with dry cloth
1. Maintenance
It is recommended to conduct quarterly check on LEAD leak detection system performance by
authorized LEAD distributors/installers.
During quarterly checking and maintenance:
Check physically on the sensing cable surface cleanliness and free from any chemical
contact.
For any parts replacement or extension, LEAD local distributors offer ex-stock and will
provide