ARD912-W2 - Detector Dahua Technology - Free user manual and instructions

Product Type	Wireless Water Leak Detector
Brand	Dahua Technology
Model	ARD912-W2
Sensor Type	Water leak detection probe (positive and negative probes)
Sensitivity	Adjustable by rotating the positive probe
Wireless Frequency	433.1–434.6 MHz or 868.0–868.6 MHz (depending on variant)
Communication Range (Open Space)	Up to 1200 m (868 MHz) / Up to 800 m (433 MHz)
Encryption	AES128
Power Supply	1 × CR123A battery (3V)
Battery Life	Up to 3 years (when triggered once daily)
Operating Temperature	-10°C to +55°C (indoor)
Operating Humidity	10% to 90% RH
Dimensions (Product)	84.7 mm × 84.7 mm × 32.5 mm
Net Weight	0.1 kg
Protection Rating	IPX5
Material	PC + ABS
Indicator Light	Multi-color LED for pairing, power status, and alarm
Installation Methods	All-in-one, split mount with screw, or split mount with adhesive tape
Compatible App	DMSS (iOS/Android) via DHUA hub
Additional Features	Low battery alarm, remote update, cloud update, temporary deactivate, siren linkage, alarm-video linkage, signal strength detection, detector test
Certifications	CE, FCC (depending on variant)
Package Contents	Water leak detector, screw package, QR code, double-sided adhesive tape, legal and regulatory information, quick start guide

Frequently Asked Questions - ARD912-W2 Dahua Technology

How do I install the ARD912-W2 water leak detector?

The detector can be installed in three ways: all-in-one (place directly on the floor), split mount with screws (drill holes and attach back cover), or split mount with adhesive tape (stick back cover on wall). Adjust the positive probe height to set sensitivity before mounting.

How do I add the detector to the DHUA hub?

Open the DMSS app, go to the hub screen, tap 'Peripheral' then '+', scan the QR code on the detector. Follow on-screen instructions to power on the detector and complete pairing. Ensure hub is disarmed and has a stable internet connection.

What should I do when the water leak alarm triggers?

The indicator flashes green for 0.4 seconds and the hub sends a notification. Check for water source near the detector, dry the probes, and reset if necessary. You can configure siren or video linkage in DMSS settings.

How do I replace the battery in the ARD912-W2?

Rotate the back cover to remove it. The unit uses a CR123A battery (3V). Replace with same type, ensuring correct polarity. Battery life is up to 3 years under normal use. The low battery alarm will notify you when replacement is needed.

How do I adjust the water leak sensitivity?

Turn the positive probe clockwise to increase sensitivity (detects smaller water amounts) or counterclockwise to decrease it. The probe height adjustment changes the gap between probes. Test after adjustment.

Is the ARD912-W2 waterproof?

The detector has an IPX5 rating, meaning it is protected against water jets from any direction. However, it is designed for indoor use and should not be submerged. The probes are exposed for water detection.

What is the maximum range of the wireless connection?

In open space, the 868 MHz variant reaches up to 1,200 m and the 433 MHz variant up to 800 m. Obstacles like walls will reduce range. Signal strength can be tested in the DMSS app.

Can I use the detector without the DMSS app?

No, the detector requires a DHUA hub and the DMSS app for configuration, alerts, and management. The hub acts as the bridge between the detector and your phone.

What if the pairing fails?

Ensure the hub is disarmed, the detector is powered on, and the QR code is scanned correctly. The indicator will slowly flash 3 times if pairing fails. Restart both devices and try again. Update firmware if needed.

How do I clean and maintain the water leak detector?

Wipe the exterior with a dry cloth. Clean the probes with a soft brush if dirty, but avoid liquids. Do not disassemble. Replace battery when low. Store in a dry place within -10°C to +55°C.

USER MANUAL ARD912-W2 Dahua Technology

Wireless Water Leak Detector

User's Manual

Abstract geometric composition with gray and red color blocks (no text or symbols)

Foreword

General

This manual introduces the installation, functions and operations of the Wireless Water Leak Detector (hereinafter referred to as the "water leak detector"). Read carefully before using the device, and keep the manual safe for future reference.

Safety Instructions

The following signal words might appear in the manual.

Signal Words	Meaning
DANGER	Indicates a high potential hazard which, if not avoided, will result in death or serious injury.
WARNING	Indicates a medium or low potential hazard which, if not avoided, could result in slight or moderate injury.
CAUTION	Indicates a potential risk which, if not avoided, could result in property damage, data loss, reductions in performance, or unpredictable results.
IPS	Provides methods to help you solve a problem or save time.
YTE	Provides additional information as a supplement to the text.

Revision History

Version	Revision Content	Release Time
V1.0.0	First release.	November 2022

Privacy Protection Notice

As the device user or data controller, you might collect the personal data of others such as their face, fingerprints, and license plate number. You need to be in compliance with your local privacy protection laws and regulations to protect the legitimate rights and interests of other people by implementing measures which include but are not limited: Providing clear and visible identification to inform people of the existence of the surveillance area and provide required contact information.

About the Manual

• The manual is for reference only. Slight differences might be found between the manual and the product.
• We are not liable for losses incurred due to operating the product in ways that are not in compliance with the manual.
• The manual will be updated according to the latest laws and regulations of related jurisdictions. For detailed information, see the paper user's manual, use our CD-ROM, scan the QR code or visit our official website. The manual is for reference only. Slight differences might be found between

the electronic version and the paper version.

• All designs and software are subject to change without prior written notice. Product updates might result in some differences appearing between the actual product and the manual. Please contact customer service for the latest program and supplementary documentation.
• There might be errors in the print or deviations in the description of the functions, operations and technical data. If there is any doubt or dispute, we reserve the right of final explanation.
• Upgrade the reader software or try other mainstream reader software if the manual (in PDF format) cannot be opened.
• All trademarks, registered trademarks and company names in the manual are properties of their respective owners.
• Please visit our website, contact the supplier or customer service if any problems occur while using the device.
• If there is any uncertainty or controversy, we reserve the right of final explanation.

Important Safeguards and Warnings

This section introduces content covering the proper handling of the water leak detector, hazard protection, and protection of property damage. Read carefully before using the water leak detector, and comply with the guidelines when using it.

Operation Requirements

• Make sure that the power supply of the water leak detector works properly before use.
• Do not pull out the power cable of the water leak detector while it is powered on.
• Only use the water leak detector within the rated power range.
• Transport, use and store the device under allowed humidity and temperature conditions.
• Prevent liquids from splashing or dripping on the device. Make sure that there are no objects filled with liquid on top of the water leak detector to avoid liquids flowing into it.
• Do not disassemble the water leak detector.

Installation Requirements

WARNING

• Connect the water leak detector to the adapter before power on.
• Strictly abide by local electrical safety standards, and make sure that the voltage in the area is steady and conforms to the power requirements of the water leak detector.
• Do not connect the water leak detector to more than one power supply. Otherwise, the might become damaged.

• Observe all safety procedures and wear required protective equipment provided for your use while working at heights.
• Do not expose the water leak detector to direct sunlight or heat sources.
• Do not install the water leak detector in humid, dusty or smoky places.
• Install the water leak detector in a well-ventilated place, and do not block the ventilator of the device.
• Use the power adapter or case power supply provided by the device manufacturer.
• The power supply must conform to the requirements of ES1 in IEC 62368-1 standard and be no higher than PS2. Note that the power supply requirements are subject to the device label.
• Connect class I electrical appliances to a power socket with protective earthing.

Table of Contents

Foreword ....

Important Safeguards and Warnings....III

1 Introduction .... 1

1.1 Overview ...... 1
1.2 Technical Specifications.... 1

2 Checklist....3
3 Appearance ....4
4 Adding the Wireless Water Leak Detector to the Hub .... 5
5 Installation....6

5.1 All-in-one Installation....6
5.2 Split Mount with Screw 7
5.3 Split Mount with Adhesive Tape....8

6 Configuration ....11

6.1 Viewing Status....11
6.2 Configuring the Water Leak Detector ....11

Appendix 1 Cybersecurity Recommendations....13

1 Introduction

1.1 Overview

Wireless Water Leak Detector can be used to detect water leaks in indoor pipes, baths, sinks, washing machines, and dishwashers. It triggers alarms and provides timely notifications to keep you up to date on ongoing events. It is easy to install and does not require wiring. It also provides communication security, supporting the use of wireless communication with encryption technology.

1.2 Technical Specifications

This section contains technical specifications of the water leak detector. Please refer to the ones that correspond with your model.

Table 1-1 Technical specification

Type Parameter Description
Function	Indicator Light	1 for multiple statuses (pairing, power status, and alarm)
	Button Power button
	Remote Update Cloud update
	Low Battery Alarm	Yes
	Tamper No
Technical	Sensor Water leak detector
	Sensitivity Adjustable
	Operating Current	28.5 uA
	Alarm Current 5.8 mA
Wireless	Carrier Frequency	DHI-ARD912-W2 (868), DHI-ARD912-W2 (868D): 868.0 MHz–868.6 MHz	DHI-ARD912-W2, DHI-ARD912-W2 (D): 433.1 MHz–434.6 MHz
	Communication Distance	DHI-ARD912-W2 (868), DHI-ARD912-W2 (868D): Up to 1,200 m (3937.01 ft) in an open space	DHI-ARD912-W2 (868), DHI-ARD912-W2 (868D): Up to 800 m (2624.67 ft) in an open space
	Transmit Power	DHI-ARD912-W2 (868), DHI-ARD912-W2 (868D): Limit 25 mW	DHI-ARD912-W2 (868), DHI-ARD912-W2 (868D): Limit 15.8 mW
	Communication Mechanism	Two-way
	Encryption Mode	AES128
	Frequency Hopping	Yes
General	Power Supply CR123A×1
	Battery Life 3 years when triggered once a day.
	Power Consumption	Max 144 mW
	Operating Temperature	-10 °C to +55 °C (+14 °F to +131 °F) (indoor)
	Storage Temperature	-10 °C to +55 °C (+14 °F to +131 °F)
	Operating Humidity	10%-90% (RH)
	Storage Humidity	10%-90% (RH)
	Product Dimensions	84.7 mm×84.7 mm×32.5 mm (3.33" × 3.33" × 1.28")
	Packaging Dimensions	135.0 mm×98.0 mm×56.0 mm (5.32" × 3.86" × 2.20")
	Net Weight 0.1 kg (0.22 lb)
	Gross Weight 0.2 kg (0.44 lb)
	Casing PC + ABS
	Protection IPX5
	Certifications	DHI-ARD912-W2 (868), DHI-ARD912-W2 (868D): CE	DHI-ARD912-W2, DHI-ARD912-W2 (D): CE, FCC

2 Checklist

Figure 2-1 Checklist

1

2

3

4

5

6

Table 2-1 Checklist

No.	Item Name	Quantity	No.	Item Name	Quantity
1 Water	leak detector 1 4			Double-sided adhesive tape	1
2 Screw	package 1 5			Legal and regulatory information	1
3 QR code	1 6 Quick start guide 1

3 Appearance

Figure 1-1 Appearance

Table 1-1 Structure

No. Name Description
1 Indicator		Press and hold the button for 2 seconds, and then the device is powered on, and the system enters pairing mode.Solid on for 2 seconds: Pairing successful.Slowly flashes for 3 times: Pairing failed.Flashes green quickly for 100 seconds, and then off: Sensitivity mode.Solid on for 0.4 seconds: An alarm event was triggered.
2 Negative probe		When the water reaches the terminal of the probe, the indicator flashes green for 0.4 seconds.You can adjust the height of the positive probe. Turn the positive prove clockwise, and the detection sensitivity of the probe will increase. Turn it anticlockwise to decrease the sensitivity.
3 Positive probe
4 Power	button Turn on or off the	device.

4 Adding the Wireless Water Leak Detector to the Hub

Before you connect water leak detector to the hub, install the DMSS app to your phone. This manual uses iOS as an example.

• Make sure that the version of the DMSS app is 1.99.300 or later, and the hub is V1.001.0000004.0 or later.
• Make sure that you have already created an account, and added the hub to DMSS.
• Make sure that the hub has a stable internet connection.
• Make sure that the hub is disarmed.

Step 1 Go to the hub screen, and then tap Peripheral to add the water leak detector.

Step 2 Tap + to scan the QR code at the bottom of the water leak detector, and then tap Next.

Step 3 Tap Next after the water leak detector has been found.

Step 4 Follow the on-screen instructions and switch the water leak detector to on, and then tap Next.

Step 5 Wait for the pairing.

Step 6 Customize the name of the water leak detector, and select the area, and then tap Completed.

5 Installation

Water leak detector supports all-in-one installation and split mount with screw or adhesive tape.

5.1 All-in-one Installation

You can adjust the height of the positive probe to adjust the sensitivity first, and then place the water leak detector at a place where the water is likely to leak directly.

Step 1 Adjust the height of the positive probe with screw to adjust the sensitivity.

Figure 5-1 Adjust the height of the positive probe (1)

Figure 5-2 Adjust the height of the positive probe (2)

Step 2 Place the detector in a place where the water is likely to leak.

Figure 5-3 Place the water leak detector

Simple line drawing of a cylindrical object with three water droplets above it, no text or symbols present.

5.2 Split Mount with Screw

You can use the screw to install the water leak detector.

Step 1 Rotate the back cover to remove it from the water leak detector.

Figure 5-4 Remove the back cover

Diagram of a circular object with internal compartments and directional arrows, no text or symbols present

Step 2 Drill 2 holes into the wall according to the hole positions of the water leak detector, and then put the expansion bolts into the holes.

Figure 5-5 Remove the back cover

Step 3 Attach the water leak detector to the back cover.

Figure 5-6 Attach the water leak detector to the back cover

Diagram showing a device with a circular component connected to a base, alongside its internal view (no text or symbols)

Step 4 Adjust the height of the positive probe with screws to adjust the sensitivity.

Figure 5-7 Adjust the height of the positive probe

5.3 Split Mount with Adhesive Tape

You can use adhesive tape to install the water leak detector.

Step 1 Rotate the back cover to remove it from the water leak detector.

Figure 5-8 Remove the back cover

Diagram of a circular structure with internal compartments and directional arrows, no text or symbols present

Step 2 Attach the water leak detector to the wall with the double-sided adhesive tape.

Figure 5-9 Remove the back cover

Diagram showing a circular device with internal components and three separate shapes: a square, a dashed rectangle, and a hand pointing to it (no text or symbols)

Step 3 Attach the water leak detector to the back cover.

Figure 5-10 Attach the water leak detector to the back cover

Diagram showing a device with a circular component connected to a base, and its close-up view of a circular component with three small holes (no text or symbols)

Step 4 Adjust the height of the positive probe with the screw to adjust the sensitivity.

Figure 5-11 Adjust the height of the positive probe

6 Configuration

You can view and edit general information of the water leak detector.

6.1 Viewing Status

On the hub screen, select a water leak detector from the peripheral list, and then you can view the status of the water leak detector.

Table 6-1 Status

Parameter Value
Temporary Deactivate	The status for whether the functions of the repeater are enabled or disabled.● : Enable.● : Disable.
Signal Strength	The signal strength between the hub and the water leak detector.● : Low.● : Weak.● : Good.● : Excellent.● : No.
Battery Level	The battery level of the water leak detector.● : Fully charged.● : Sufficient.● : Moderate.● : Insufficient.● : Low.
Online Status	Online and offline status of the water leak detector.● : Online.● : Offline.
Water Leak Status	The status of water leak.● : Normal.● : Alarm.
Transmit through Repeater	The status of whether the water leak detector forwards its messages to the hub through the repeater.
Program Version	The program version of the water leak detector.

6.2 Configuring the Water Leak Detector

On the hub screen, select a water leak detector from the peripheral list, and then tap ☑ to configure the parameters of the water leak detector.

Table 6-2 Parameter description

Parameter Description
Device Configuration	View water leak detector name, type, SN and device model.Edit water leak detector name, and then tapSaveto save configuration.
Area	Select the area to which the water leak detector is assigned.
Temporary Deactivate	Whether send sensor information to the alarm hub.TapEnable, and then the water leak detector will send alarm messages to the hub.Enableis set by default.TapDisable, and then the water leak detector will not send alarm messages to the hub.
LED Indicator	LED Indicator is enabled by default.If LED Indicator is disabled, the LED indicator will remain off regardless of whether the water leak detector is functioning normally or not.
Siren Linkage	When an alarm is triggered, the peripherals will report the alarm events to the hub and alert with siren.
Alarm-video Linkage	When an alarm is triggered, the peripherals will report the alarm events to the hub and then will link events.
Video Channel	Select the video channel as needed.
Over-temperature Alarm	Enable theOver-temperature Alarmfunction, and then the alarm will be triggered when the temperature of the area where the water leak detector is installed is higher or lower than the defined one.
Signal Strength Detection	Test the current signal strength.
Detector Test	Detect whether the peripheral works.
Transit Power	Select from high, low, and automatic.The higher transmission power levels are, the further transmissions can travel, but power consumption increases.If you selectLow, the will enter into reduced sensitivity mode.We recommend you selectingLowwhen installing the device, and then adjusting toHighorAutomatic.The indicator flashes when setting asLow.
User's Manual View user's manual of the device.
Cloud Update Update online.
Delete	Delete the water leak detector.Go to the hub screen, select the water leak detector from the list, and then swipe left to delete it.

Appendix 1 Cybersecurity Recommendations

Cybersecurity is more than just a buzzword: it's something that pertains to every device that is connected to the internet. IP video surveillance is not immune to cyber risks, but taking basic steps toward protecting and strengthening networks and networked appliances will make them less susceptible to attacks. Below are some tips and recommendations from Dahua on how to create a more secured security system.

Mandatory actions to be taken for basic device network security:

1. Use Strong Passwords

Please refer to the following suggestions to set passwords:

• The length should not be less than 8 characters.
• Include at least two types of characters; character types include upper and lower case letters, numbers and symbols.
• Do not contain the account name or the account name in reverse order.
• Do not use continuous characters, such as 123, abc, etc.
• Do not use overlapped characters, such as 111, aaa, etc.

2. Update Firmware and Client Software in Time

• According to the standard procedure in Tech-industry, we recommend to keep your device (such as NVR, DVR, IP camera, etc.) firmware up-to-date to ensure the system is equipped with the latest security patches and fixes. When the device is connected to the public network, it is recommended to enable the "auto-check for updates" function to obtain timely information of firmware updates released by the manufacturer.
• We suggest that you download and use the latest version of client software.

"Nice to have" recommendations to improve your device network security:

1. Physical Protection

We suggest that you perform physical protection to device, especially storage devices. For example, place the device in a special computer room and cabinet, and implement well-done access control permission and key management to prevent unauthorized personnel from carrying out physical contacts such as damaging hardware, unauthorized connection of removable device (such as USB flash disk, serial port), etc.

2. Change Passwords Regularly

We suggest that you change passwords regularly to reduce the risk of being guessed or cracked.

3. Set and Update Passwords Reset Information Timely

The device supports password reset function. Please set up related information for password reset in time, including the end user's mailbox and password protection questions. If the information changes, please modify it in time. When setting password protection questions, it is suggested not to use those that can be easily guessed.

4. Enable Account Lock

The account lock feature is enabled by default, and we recommend you to keep it on to guarantee the account security. If an attacker attempts to log in with the wrong password several times, the corresponding account and the source IP address will be locked.

5. Change Default HTTP and Other Service Ports

We suggest you to change default HTTP and other service ports into any set of numbers between

1024–65535, reducing the risk of outsiders being able to guess which ports you are using.

6. Enable HTTPS

We suggest you to enable HTTPS, so that you visit Web service through a secure communication channel.

7. MAC Address Binding

We recommend you to bind the IP and MAC address of the gateway to the device, thus reducing the risk of ARP spoofing.

8. Assign Accounts and Privileges Reasonably

According to business and management requirements, reasonably add users and assign a minimum set of permissions to them.

9. Disable Unnecessary Services and Choose Secure Modes

If not needed, it is recommended to turn off some services such as SNMP, SMTP, UPnP, etc., to reduce risks.

If necessary, it is highly recommended that you use safe modes, including but not limited to the following services:

• SNMP: Choose SNMP v3, and set up strong encryption passwords and authentication passwords.
• SMTP: Choose TLS to access mailbox server.
• FTP: Choose SFTP, and set up strong passwords.
• AP hotspot: Choose WPA2-PSK encryption mode, and set up strong passwords.

10. Audio and Video Encrypted Transmission

If your audio and video data contents are very important or sensitive, we recommend that you use encrypted transmission function, to reduce the risk of audio and video data being stolen during transmission.

Reminder: encrypted transmission will cause some loss in transmission efficiency.

11. Secure Auditing

• Check online users: we suggest that you check online users regularly to see if the device is logged in without authorization.
• Check device log: By viewing the logs, you can know the IP addresses that were used to log in to your devices and their key operations.

12. Network Log

Due to the limited storage capacity of the device, the stored log is limited. If you need to save the log for a long time, it is recommended that you enable the network log function to ensure that the critical logs are synchronized to the network log server for tracing.

13. Construct a Safe Network Environment

In order to better ensure the safety of device and reduce potential cyber risks, we recommend:

• Disable the port mapping function of the router to avoid direct access to the intranet devices from external network.
• The network should be partitioned and isolated according to the actual network needs. If there are no communication requirements between two sub networks, it is suggested to use VLAN, network GAP and other technologies to partition the network, so as to achieve the network isolation effect.
• Establish the 802.1x access authentication system to reduce the risk of unauthorized access to private networks.
• Enable IP/MAC address filtering function to limit the range of hosts allowed to access the

device.

More information

Please visit Dahua official website security emergency response center for security announcements and the latest security recommendations.

ENABLING A SAFER SOCIETY AND SMARTER LIVING