User manualEnglish

GY-WT208 User Manual

This manual introduces a non-locating water leak monitoring and alarm controller. It covers operating principles, specifications, interfaces, sensing cable connections and relay integration, with Modbus RTU frame definitions, status-reading and configuration examples, dimensions, mounting methods and communication troubleshooting.

GY-WT208 User Manual English.pdf

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ProductManual

NonlocatingWaterDetectionUnit

ProductModel:WT208

Releasedate:August5,2026

Version:V1.0

DongguanYunjieIntelligentTechnologyCo.,Ltd.

1.ProductOverview

Understandthebasicinformation,characteristicsandworking

principleoftheproduct

Product

Overview

Ournonlocationbasedwaterleakdetectorisspecificallydesignedforenvironmentssuchascomputerrooms

andwarehouseswherewaterisnotpresent.Itcontinuouslymonitorsforleakswithinthefacilityand,when

usedinconjunctionwithathreecoreleakdetectioncable,canquicklyandaccuratelydetectleaksacross

multiplezones.Whentheleakdetectionropedetectsliquid,thedeviceimmediatelytriggersanalarmand

activatestherelay;therelaycanbeconnectedtoanexternalaudibleandvisualalarm.

ThisdeviceusesthestandardModbusRTUprotocolandcanbeeasilyconnectedtoanintegratedterminalforcentralizedmanagement.

Itcanfunctionnotonlyasastandaloneoperatingunitbutalsointerfacewithothercontrollerssuch

asPLCs,facilitatingdataacquisitionandprogramming.Thedeviceiscompactinsize,featuresa

welldesignedlayout,andiseasytoinstallanddeploy.Therelaysupportsuserselectabledefault

on/offmodestoaccommodatetheconfigurationrequirementsofvariousaudibleandvisualalarms.

Applicable

scenarios

Product

Features

Thisproductiswidelyapplicableforleakdetectionincriticalenvironmentssuchasdatacenters,

communicationbasestations,warehouses,andlibraries,providinguserswithasecureandreliable

environmentalmonitoringsolution.

Working

principle

Thecabletypewaterimmersionalarmconsistsofasensingcableandacontroller.Therearetwotestwiresinsidethecable.

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Warehouse

Factory

IGENGYUN&Jie

NonlocatingLeakDetection

Controller

Pumproom

Archive

Datacenter

Data

Center

Highsensitivity

Alarm

notification

Stronganti

interference

Rapidresponse,alarmtime≤3seconds

Soundandlightdoublealarm,abnormalprompt

Resistenvironmentalinterferenceandreduce

misoperation

Easytoinstall

Easy

maintenance

Wide

compatibility

DIN35railinstallation

Removableforcleaning.Theleakdetectioncableisreusableafterdrying.

Supportaccesstothirdpartymonitoringsystems

Atordinarytimes,theydonotconducteachother;oncethecableencounterswateratanyposition,thewater

penetratesintothetwodetectionlinestoconduct,generatecurrentsignals,andthecontrollerimmediately

alarms.Thepositioningtypecanalsoautomaticallycalculatetheleakagepositionaccordingtotheresistance

ofthecurrentloop,withanaccuracyofabouthalfameter.Thecableautomaticallyrecoversafterdrying,can

bereused,andissuitableforlayinglargeareasalongpipesorunderthefloor.

2.technicalparameters

Productdetailedtechnicalspecificationsand

performanceindicators

Product

parameters

ProductName

NonlocatingWaterDetection

Controller

Model

Detectionsensor

TwocoreLeak

DetectionCable

WaterImmersionDetector

HousingMaterial

ABS/Black

Perceived

distance

Powerindicator

light

Green

light

Alarmindicator

Red

light

Communication

Indicator

Blue

light

Relay

Normallyopen/

Normallyclosed

Buzzer

There

Communication

method

WiredRS485

Baudrate

2400/4800/9600/19200/38400/115200canbeset,factorydefault9600bit/s

Operating

voltage

Operating

current

Operatingtemperature

range

40℃~85℃(industrialgrade)

Antiinterference

requirements

CanmeettheEMCelectromagneticcompatibilitytest,electrostatictest

requirements

Thedataarealllaboratorymeasurements,butduetochangesintheobjectiveenvironment,thedatawillbe

slightlybiased.

Function

Type

Project

Description

Input

TwocoreLeak

DetectionCable

The0.11000mimmersionpositioningdetectioncableleavesthefactory

accordingtothelengthrequiredbythecustomer.Whenoneormorepartsin

themiddleoftheleakingropecomeintocontactwithwater,itwillbeshort.

Thealarmisjudgedbydetectingthevoltage.

Output

RS485Wired

StandardMODBUSRTUcommunicationmethods;

Relay

Detectionofwaterdrive,NOconnectionstatechange;

Display

PowerOnStatusGreenCommunicationStatusBlueAlarm

StatusRed

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Buzzer

Alarmstatus:theredlightisalwaysonandthebuzzeris

alwaysringing;

Breakingalarm:redlightandbuzzer0.5secondscyclesoundindication;

port

Powersupplypositive,powersupply

negative,A,B;

Relay

Leakage

rope

L1(white),L2(blue),L3(red)

3.productstructure

FunctionalDescriptionandLocationSchematicof

ProductComponents

Productdimension

drawing

Optionallengthsfortheleakdetectioncable:3m/5m/7.5m/10m/20m/30m/40m/50m

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Relay

NonlocatingLeakDetectionController

Leakage

rope

2000mmmain50mm

Component

Description

4.CommunicationProtocol

Specifications

ModbusRTUcommunicationprotocol

standard

Basic

Agreement

Encoding

8bitbinary

Databit

8Bits

paritybit

None

Stopbit

1st

place

errorcheck

CRC(RedundancyCheck)

Dataframeformat

UsingtheModbusRTUcommunicationprotocol,theformatisas

follows:

Initialstructure≥4bytesintime

Addresscode=1byte

Functioncode=1byte

DataArea=Nbytes

Errorchecking=16bitCRCcode

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Powerconnector

RelayInterface

Sensitivityadjustment

Leakagecontroller

Power/Communication/

Alarm

Leakdetection

cable

Indicator

light

485interface

Inspectionline

interface

Endstructure≥4bytesoftime

Addresscode:istheaddressofthetransmitter,whichisuniqueinthecommunicationnetwork

(factorydefault0x05),thebroadcastaddressis0xFE,andthebroadcastaddresscanbe

usedforqueryandsettingwhenthereisonlyonedeviceonthebus.Thedefaultbaudrateis

9600,noverification,1stopbitdeviceframereplytimeisgreaterthan3.5charactertime

Dataframeformatdefinition

UsingtheModbusRTUcommunicationprotocol,theformatisasfollows:

Addresscode=1byte

Functioncode=1byte

DataArea=Nbytes

CRCcode:atwobytecheckcode.

Addresscode:theaddressofthedetector,thefactorydefaultis0x01,andtheaddresscanbemodifiedby

instructions.

Functioncode:instructionfunctioninstructionissuedbythehost,

0x03(readregisterdata),0x06(writeregisterdata).

Dataarea:Thedataareaisspecificcommunicationdata.Notethatthehighbyteof16bitsdataisfirst!

Content

Operation

Function

code

Definition

Explanation

Queryanalog

quantity

read

Normalvalueisgenerallyabout700

Alarm:Readingbelowsensitivity

threshold

Queryalarmstatus

read

0indicatesnormal,1indicatesalarm

Querysensitivity

read

Querydeviceaddress

read

DeviceAddressInquiry,1253

Querybaudrate

read

Scope16detailsbelow

QueryDelayAlarmTime

read

065535seconds(default0)

Setsensitivity

write

200500(thelargerthevalue,themore

sensitive)

Deviceaddresssetting

write

DeviceAddressSetting,1253

SetBaudRate

write

Setthebaudrate,16arerepresentedasfollows

Setdelayalarmtime

write

065535seconds

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Content

Operation

Function

code

Definition

Explanation

QueryLeakDetection

CableStatus

read

0meansnormal,1meansbrokenline

Queryusingthe

command

1.Querythealarmstatuswiththedeviceaddressof0x05(thefollowingcodesareallhexadecimal)

Function

code

ReadQuantity

lowbitofcheck

code

Highbitofcheck

code

Querythenormalresponseframeof

thedevice

Address

code

Function

code

Numberofdata

Data

lowbitofcheck

code

Highbitofcheck

code

Queryresponseframesfordevice

alarms

Address

code

Function

code

Numberofdata

Data

lowbitofcheck

code

Highbitofcheck

code

2.Querytheanalogvaluewiththedeviceaddressof0x05(thefollowingcodesareallhexadecimal)toinquirethe

addresscodeoftheframe

Function

code

ReadQuantity

lowbitofcheck

code

Highbitofcheck

code

Responseframe:Analogvalue=02D3(hexadecimal),723(decimal)

Function

code

Numberofdata

Data

lowbitofcheck

code

Highbitofcheck

code

3.Querythesensitivityvaluewiththedeviceaddressof0x05(thefollowingcodesareallhexadecimal)

Function

code

ReadQuantity

lowbitofcheck

code

Highbitofcheck

code

Responseframe:Sensitivity=0199(hexadecimal),409(decimal)

Function

code

Numberofdata

Data

lowbitofcheck

code

Highbitofcheck

code

4.Querythedeviceaddressvaluewiththedeviceaddressof0x05(thefollowingcodesareallhexadecimal)

Function

code

ReadQuantity

lowbitofcheck

code

Highbitofcheck

code

Replyframe:Deviceaddressvalueis5

Address

code

Function

code

Numberofdata

Data

lowbitofcheck

code

Highbitofcheck

code

5.Querythebaudratevaluewiththedeviceaddressof0x05(thefollowingcodesareallhexadecimal)

Function

code

ReadQuantity

lowbitofcheck

code

Highbitofcheck

code

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Address

code

Address

code

Address

code

Address

code

Address

code

Address

code

Address

code

Answerframe:baudratevalueof3is9600

Address

code

Function

code

Numberofdata

Data

lowbitofcheck

code

Highbitofcheck

code

6.Querythedelayalarmtimewiththedeviceaddressof0x05(thefollowingcodesareallhexadecimal)

Function

code

ReadQuantity

lowbitofcheck

code

Highbitofcheck

code

Answerframe:delayalarmtimeis0(default)

Address

code

Function

code

Numberofdata

Data

lowbitofcheck

code

Highbitofcheck

code

7.Setthesensitivityvalueofthedeviceaddressto0x05to300(hexadecimalis

012C)(thefollowingcodesareallhexadecimal)

Function

code

WriteData

lowbitofcheck

code

Highbitofcheck

code

Answerframe:setsuccessfully

Address

code

Function

code

WriteData

lowbitofcheck

code

Highbitofcheck

code

8.Setthedeviceaddressvaluewiththedeviceaddress0x05to1(thefollowingcodesareallhexadecimal)

Function

code

WriteData

lowbitofcheck

code

Highbitofcheck

code

Answerframe:setsuccessfully

Address

code

Function

code

WriteData

lowbitofcheck

code

Highbitofcheck

code

9.Setthebaudratewiththedeviceaddressof0x05to19200(thefollowingcodesareallhexadecimal)

Function

code

WriteData

lowbitofcheck

code

Highbitofcheck

code

Answerframe:setsuccessfully

Address

code

Function

code

WriteData

lowbitofcheck

code

Highbitofcheck

code

10.Setthedelayalarmtimewiththedeviceaddress0x05to3(thefollowingcodesareallhexadecimal)

Function

code

WriteData

lowbitofcheck

code

Highbitofcheck

code

Answerframe:setsuccessfully

Address

code

Function

code

WriteData

lowbitofcheck

code

Highbitofcheck

code

Commonproblemsandsolutions

Possiblecausesofnooutputoroutputerrors:

ThecomputerhasaCOMmouth,andthemouthselectedis

incorrect.

Thebaudrateiswrong.

The485busisdisconnected,ortheandBlinesareconnected

reversely.

Iftherearetoomanydevicesorthewiringistoolong,supplypowernearby,adda485booster,andincreasethe120Ωterminalresistance.

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Address

code

Address

code

Address

code

Address

code

Address

code

TheUSB485driverisnotinstalledorisdamaged.

Damagetoequipment.

5.installationmethod

Standardizetheinstallationprocessandlowerthe

operatingthreshold

ProductUsage

Topology

Whenusingtheequipment,itneedstobeusedtogetherwiththepositioningwaterleakageaccessorypackage.Theaccessory

packageincludes:nonpositioningwaterleakageinductionline,nonpositioningwaterleakageleadwire,fixedadhesiveclip

andnonpositioningwaterleakageterminationend.Thefollowingfigureisthetopologydiagramofequipmentuse:

Nonpositioningtwocore

inductionline

LeakDetection

LeadCable

Terminal

Fixedadhesive

paste

Note:Itisonlyusedtoindicatetheinstallationmethodoftheproduct.Detailssuchasportsare

subjecttotheactualproduct.

Wallmounting/DIN35railmounting

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Relay

DIN35mmrail

Nonlocating

LeakDetection

Controller

Leak

detection

cable

Installationprecautions

Groundcleaning:cleanupdustandoilonthegroundbeforeinstallationtoensuregoodcontactbetweentheprobe

andtheground.

Fixfirmly:thesensorandcableshallbefixedwithbuckleoradhesivetapetopreventdisplacement.

Avoidfalsepositives:Donotinstallinplaceswherewaterstainsandcondensateoftenoccur(suchasdirectlybelowtheair

outletoftheairconditioner).

Wiringspecification:powerlinesandsignallinesawayfromstrongcablestoavoid

interference.

Waterprooftreatment:theterminaliswaterproofandsealedtopreventpoorcontactcausedbywatervapor

corrosion.

AboutourCOMPANYPROFILE

Readabletextreferenceforsmalllabels

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Warehouse

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Factory

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IGENGYUN&Jie

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NonlocatingLeakDetectionController

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Pumproom

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DataCenter

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Highsensitivity

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Alarmnotification

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Strongantiinterference

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Rapidresponse,alarmtime≤3seconds

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Soundandlightdoublealarm,abnormalprompt

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Resistenvironmentalinterferenceandreducemisoperation

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Easytoinstall

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Easymaintenance

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Widecompatibility

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DIN35railinstallation

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Removableforcleaning.Theleakdetectioncableisreusableafterdrying.

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Supportaccesstothirdpartymonitoringsystems

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NonlocatingWaterDetectionController

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TwocoreLeakDetectionCable

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WaterImmersionDetectorHousingMaterial

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Perceiveddistance

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Powerindicatorlight

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Greenlight

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Redlight

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CommunicationIndicator

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Bluelight

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Normallyopen/Normallyclosed

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Thereis

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Communicationmethod

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Operatingvoltage

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Operatingcurrent

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Operatingtemperaturerange

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Antiinterferencerequirements

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CanmeettheEMCelectromagneticcompatibilitytest,electrostatictestrequirements

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Description

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TwocoreLeakDetectionCable

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StandardMODBUSRTUcommunicationmethods;

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PowerOnStatusGreenCommunicationStatusBlueAlarmStatusRed

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Alarmstatus:theredlightisalwaysonandthebuzzerisalwaysringing;

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Powersupplypositive,powersupplynegative,A,B;

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Leakagerope

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Relay

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NonlocatingLeakDetectionController

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Leakagerope

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2000mmmain50mm

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Encoding

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None

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1stplace

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Powerconnector

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Sensitivityadjustment

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Leakagecontroller

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Power/Communication/Alarm

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Leakdetectioncable

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Indicatorlight

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Inspectionlineinterface

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Operation

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Functioncode

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DefinitionExplanation

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Queryanalogquantity

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read

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Normalvalueisgenerallyabout700

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Alarm:Readingbelowsensitivitythreshold

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read

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read

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read

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read

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read

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write

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200500(thelargerthevalue,themoresensitive)

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Deviceaddresssetting

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write

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write

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Setthebaudrate,16arerepresentedasfollows

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write

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065535seconds

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Operation

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Functioncode

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DefinitionExplanation

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QueryLeakDetectionCableStatus

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read

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Functioncode

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lowbitofcheckcode

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Highbitofcheckcode

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Addresscode

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Functioncode

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Numberofdata

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lowbitofcheckcode

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Highbitofcheckcode

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Addresscode

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Functioncode

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Numberofdata

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lowbitofcheckcode

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Highbitofcheckcode

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Functioncode

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lowbitofcheckcode

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Highbitofcheckcode

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Functioncode

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Numberofdata

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lowbitofcheckcode

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Highbitofcheckcode

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Functioncode

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lowbitofcheckcode

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Highbitofcheckcode

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Functioncode

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Numberofdata

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lowbitofcheckcode

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Highbitofcheckcode

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Functioncode

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lowbitofcheckcode

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Highbitofcheckcode

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Addresscode

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Functioncode

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Numberofdata

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lowbitofcheckcode

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Highbitofcheckcode

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Functioncode

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lowbitofcheckcode

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Highbitofcheckcode

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Addresscode

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Addresscode

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Addresscode

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Addresscode

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Addresscode

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Addresscode

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Addresscode

Sourcepage8

Addresscode

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Functioncode

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Numberofdata

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lowbitofcheckcode

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Highbitofcheckcode

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Functioncode

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lowbitofcheckcode

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Highbitofcheckcode

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Addresscode

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Functioncode

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Numberofdata

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lowbitofcheckcode

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Highbitofcheckcode

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Functioncode

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lowbitofcheckcode

Sourcepage8

Highbitofcheckcode

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Addresscode

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Functioncode

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lowbitofcheckcode

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Highbitofcheckcode

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Functioncode

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lowbitofcheckcode

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Highbitofcheckcode

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Addresscode

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Functioncode

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lowbitofcheckcode

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Highbitofcheckcode

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Functioncode

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lowbitofcheckcode

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Highbitofcheckcode

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Addresscode

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Functioncode

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lowbitofcheckcode

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Highbitofcheckcode

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Functioncode

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lowbitofcheckcode

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Highbitofcheckcode

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Addresscode

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Functioncode

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lowbitofcheckcode

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Highbitofcheckcode

Sourcepage8

Addresscode

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Addresscode

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Addresscode

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Addresscode

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Addresscode

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Nonpositioningtwocoreinductionline

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LeakDetectionLeadCable

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Fixedadhesivepaste

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Leakdetectioncable