PQWT PQ125 Series Pipe Water Leak Detector | Indoor Outdoor Acoustic & Tracer Gas Models

Professional Pipeline Leak Detection for Indoor, Outdoor and Difficult Underground Applications

The PQWT PQ125 Series is a professional pipe water leak detection platform designed for locating suspected leaks in pressurized water pipelines across indoor, outdoor and underground environments.

The series is available in five configurations - PQ125A, PQ125B, PQ125C, PQ125D and PQ125E - allowing users to select the appropriate sensor configuration according to the working environment, pipeline conditions and required detection depth.

Depending on the selected model, the manufacturer-stated measurement depth ranges from 0.5 m to up to 8 m.

PQ125E additionally combines acoustic leak detection with tracer-gas detection for difficult applications where acoustic transmission may be weak or environmental noise may interfere with conventional listening methods.

1. SELECT YOUR PQ125 CONFIGURATION

PQ125A - Indoor Pipe Water Leak Detector

Designed primarily for concealed indoor pressurized pipelines.

Manufacturer-stated measurement depth: 0.5 m

Suitable for:

• Bathroom concealed pipes

• Kitchen water lines

• Wall-mounted pipelines

• Under-floor pipelines

• Cabinet and confined areas

• Residential plumbing

• Commercial building plumbing

PQ125A uses dedicated indoor acoustic sensors for detecting leak-related sound and vibration in concealed pressure pipelines.

PQ125B - Outdoor Pipe Water Leak Detector

Designed for outdoor and buried pipeline leak detection.

Manufacturer-stated measurement depth: 3 m

Suitable for:

• Outdoor water pipelines

• Buried pipelines

• Ground-level pipeline inspection

• Building water networks

• Property maintenance

• External plumbing systems

• Pipeline route investigation

The outdoor sensor configuration is intended for ground-based acoustic detection.

PQ125C - Indoor & Outdoor Pipe Water Leak Detector

A flexible configuration for technicians who work across both indoor and outdoor pipeline environments.

Manufacturer-stated measurement depth: 3 m

Suitable for:

• Residential plumbing

• Commercial buildings

• Indoor concealed pipes

• Outdoor buried pipes

• Property maintenance

• Plumbing service companies

• General pipeline inspection

PQ125C combines multiple sensor configurations to provide greater flexibility than an indoor-only or outdoor-only setup.

PQ125D - Professional Indoor & Outdoor Pipe Water Leak Detector

Designed for broader indoor and outdoor pipeline inspection requirements.

Manufacturer-stated measurement depth: up to 6 m

Suitable for:

• Deep underground pipeline inspection

• Municipal water systems

• Commercial properties

• Industrial facilities

• Building service contractors

• Fire-water pipelines

• Long-distance pipeline maintenance

The expanded sensor configuration provides additional contact and detection options for different surfaces and pipeline conditions.

PQ125E - Tracer Gas + Indoor & Outdoor Pipe Water Leak Detector

The most comprehensive configuration in the PQ125 family.

Manufacturer-stated measurement depth: up to 8 m with the tracer-gas sensor

PQ125E combines acoustic leak detection with a tracer-gas detection sensor for difficult leak-location applications.

Suitable for:

• Deep underground pipeline inspection

• Difficult-to-locate leaks

• Municipal pipeline networks

• Industrial pipelines

• Fire-water systems

• Commercial buildings

• Outdoor buried pipelines

• Situations where acoustic transmission is weak

• Complex underground plumbing investigations

The manufacturer specifies the TLS-H8 tracer-gas sensor for the stated 8 m measurement capability.

2. WHY PQWT PQ125?

The PQ125 Series combines acoustic signal acquisition, sensor-based detection, noise filtering and intelligent signal analysis in a portable field instrument.

Key capabilities include:

• High-sensitivity acoustic detection

• Multiple sensor configurations

• Indoor and outdoor detection options

• Frequency-based signal analysis

• Adjustable gain

• Adjustable volume

• Noise separation

• Time-domain waveform display

• Portable battery-powered operation

• 7-inch LCD display

• Computer data transmission

• Multiple language interface

• Optional tracer-gas detection on PQ125E

3. INTELLIGENT LEAK SIGNAL ANALYSIS

The PQ125 platform is designed to help operators distinguish leak-related acoustic characteristics from surrounding environmental noise.

Its signal-processing approach can analyze characteristics including:

• Frequency

• Signal amplitude

• Duration

• Acoustic intensity

• Time-domain waveform

• Background noise characteristics

This helps technicians narrow down suspected leak locations before opening floors, walls or underground surfaces.

4. SOUND INTENSITY FOCUSING

Environmental noise can make underground leak detection difficult.

The PQ125 system incorporates sound-intensity focusing and noise-reduction techniques intended to help separate relevant pipeline acoustic signals from surrounding interference.

Field results can vary according to:

• Pipe material

• Pipe diameter

• Water pressure

• Leak size

• Surface material

• Soil conditions

• Burial depth

• Environmental noise

• Sensor contact

• Operator technique

Therefore, the stated measurement depth should be understood as a manufacturer-stated specification, not a guaranteed leak-detection result in every installation.

5. DUAL-MEMBRANE RESONANCE TECHNOLOGY

Selected PQ125 configurations use dual-membrane resonance sensors designed for sensitive acoustic pickup in indoor and space-constrained applications.

These sensors can be used for applications involving:

• Floors

• Walls

• Cabinets

• Indoor pipe routes

• Confined spaces

• Concealed plumbing

The PQ125A specification, for example, identifies DMR-V59 and DMR-H40 sensors for indoor applications.

6. ACOUSTIC CAVITY RESONANCE

The sensor system is designed to amplify and capture subtle vibration generated by suspected pipeline leakage.

This can help technicians identify small differences between:

Normal background sound

and

Potential leak-related acoustic signals

The instrument should be used as a diagnostic aid together with pipeline knowledge, pressure conditions and repeat measurements.

7. DYNAMIC TIME-DOMAIN WAVEFORM DISPLAY

The 7-inch LCD display provides visual feedback of detected acoustic signals.

The display can assist operators in examining:

• Signal strength

• Waveform characteristics

• Background noise

• Acoustic changes

• Detection response

This makes the system useful for field technicians who need both audible and visual feedback.

8. TRACER-GAS DETECTION - PQ125E

PQ125E adds tracer-gas detection to the acoustic detection system.

The manufacturer specifies the TLS-H8 tracer-gas sensor and a measurement capability of up to 8 m for this configuration.

Tracer-gas detection can be particularly useful when acoustic signals are difficult to transmit through:

• Deeply buried pipelines

• Certain pipe materials

• Low-pressure systems

• Complex underground structures

• High-noise environments

Tracer-gas detection is a complementary detection method and requires an appropriate tracer-gas procedure and site conditions.

9. 7-INCH FIELD DISPLAY

The PQWT PQ125 uses a:

7-inch LCD display

Resolution:

1024 × 600

The larger display provides a practical interface for field operation and signal observation.

10. ADJUSTABLE GAIN & VOLUME

Gain

Default:

3 levels

Adjustable:

Up to 10 levels

Volume

Default:

5 levels

Adjustable:

Up to 10 levels

Adjustability allows technicians to adapt the instrument to different signal strengths and operating environments.

11. FREQUENCY RANGE

The PQ125 Series supports different acquisition/adjustment ranges for indoor and outdoor detection.

Indoor

600 Hz - 15 kHz

Outdoor

20 Hz - 5 kHz

This broad frequency coverage allows the system to process different acoustic characteristics encountered during indoor and outdoor pipeline inspection.

12. BATTERY & FIELD OPERATION

Battery:

3.7 V 7000 mAh

Manufacturer-published working time:

Up to approximately 8 hours

Charging time:

Approximately 6-8 hours

Power consumption:

Approximately 3 W

The compact battery-powered design is suitable for mobile field inspection.

13. COMPACT & PORTABLE DESIGN

Host machine weight:

Approximately 0.6 kg

Host dimensions:

221 × 149 × 43 mm

The lightweight host design makes the PQWT PQ125 suitable for technicians who need to carry the equipment between multiple inspection locations.

14. MULTI-LANGUAGE INTERFACE

Supported languages include:

• English

• French

• Spanish

• Arabic

• Turkish

• Italian

This makes the system suitable for professional field teams operating across different markets.

15. DETECTION MODES

The PQ125 Series supports:

General Detection Mode

Used for initial investigation and identification of suspicious acoustic conditions.

Location / Positioning Mode

Used to narrow down the suspected leak location after initial screening.

The operator should compare repeated readings and relevant pipeline locations rather than treating one signal as automatic confirmation of a leak.

16. COMPUTER DATA CONNECTION

The PQ125 Series supports computer connectivity for data transmission.

This can assist with:

• Data transfer

• Detection record management

• Technical analysis

• Inspection documentation

The exact supplied accessories and data-management configuration should be confirmed for the selected model before order confirmation.

17. APPLICATIONS

Residential Plumbing

• Bathroom leaks

• Kitchen pipelines

• Concealed wall pipes

• Floor pipelines

• Balcony water lines

Commercial Buildings

• Offices

• Shopping centres

• Hotels

• Apartments

• Schools

• Hospitals

• Commercial properties

Municipal & Utility Applications

• Buried water pipelines

• Distribution networks

• Pipeline maintenance

• Water utility inspection

Industrial Applications

• Industrial water lines

• Process water pipelines

• Facility maintenance

• Large-property plumbing networks

Fire Protection Systems

• Fire-water pipelines

• Underground fire-water networks

• Building fire-service pipelines

18. PQ125 MODEL COMPARISON

The manufacturer describes the models as different sensor/application configurations rather than simply five versions of the same instrument.

19. TECHNICAL SPECIFICATIONS

Brand: PQWT

Series: PQ125

Product Type: Professional Pipe Water Leak Detector

Detection Technology: Acoustic leak detection / tracer-gas detection depending on model

Models: PQ125A / PQ125B / PQ125C / PQ125D / PQ125E

Display: 7-inch LCD

Display Resolution: 1024 × 600

Battery: 3.7 V 7000 mAh

Host Weight: Approx. 0.6 kg

Host Size: Approx. 221 × 149 × 43 mm

Gain: Default 3 levels / up to 10 adjustable levels

Volume: Default 5 levels / up to 10 adjustable levels

Indoor Frequency: 600 Hz - 15 kHz

Outdoor Frequency: 20 Hz - 5 kHz

Working Temperature: Approximately -20°C to 50°C

Working Time: Up to approximately 8 hours

Charging Time: Approximately 6-8 hours

Power Consumption: Approximately 3 W

Languages: English / French / Spanish / Arabic / Turkish / Italian

Warranty: 2 years

Maintenance: Long-term technical support / maintenance subject to service terms

Origin: Hunan, China

The manufacturer-published specifications include the above core host specifications and model-specific sensor configurations.

20. SENSOR CONFIGURATION BY MODEL

PQ125A

DMR-V59 + DMR-H40

PQ125B

RCS-S3

PQ125C

RCS-S3 + DMR-V59 + DMR-H40

PQ125D

RCS-S3 + RCS-L6 + DMR-V59 + DMR-H40

PQ125E

DMR-V59 + DMR-H40 + RCS-S3 + RCS-L6 + TLS-H8

PQ125E therefore combines four acoustic sensors with the TLS-H8 tracer-gas sensor in the manufacturer-described configuration.

21. WHAT IS INCLUDED?

The exact package depends on the selected PQ125 variant.

Typical system components can include:

• PQWT host machine

• Model-specific acoustic sensors

• Control handle

• Headphones

• Listening accessories

• Charging equipment

• USB/data cable

• Carrying/accessory components

• Tracer-gas sensor for PQ125E

• Other model-specific accessories

Because the sensor package differs between A, B, C, D and E, the final commercial quotation should confirm the exact included accessories before payment.

22. PACKAGING

Selling Unit: 1 complete unit

Approximate single package size: 40 × 23 × 33 cm

Approximate gross weight: 5.3 kg

Actual shipping weight and package configuration may vary according to selected model and accessories.

23. IMPORTANT FIELD PERFORMANCE NOTE

The stated 0.5 m, 3 m, 6 m and 8 m values are manufacturer-stated measurement/depth specifications for the respective configurations.

Actual field detection performance is affected by:

• Pipe material

• Pipe diameter

• Water pressure

• Leak size

• Leak flow characteristics

• Soil composition

• Surface construction

• Burial conditions

• Ambient noise

• Pipeline accessibility

• Sensor placement

• Operator experience

Therefore, no underground leak detector should be interpreted as guaranteeing successful detection at the maximum stated depth in every real-world installation.

Repeat measurements and appropriate verification are recommended before excavation or repair.

24. WHO SHOULD CONSIDER PQWT PQ125?

The PQ125 Series is suitable for:

• Professional plumbing contractors

• Leak detection service companies

• Building maintenance teams

• Facility management companies

• Municipal water departments

• Fire-service contractors

• Industrial maintenance teams

• Property maintenance companies

• Water pipeline inspection teams

• Plumbing diagnostic professionals

25. WHY FIVE CONFIGURATIONS?

Instead of forcing every customer to purchase the largest configuration, the PQ125 platform allows the equipment to be matched to the actual job.

Indoor-only work → PQ125A

Outdoor buried pipeline work → PQ125B

Indoor + outdoor general work → PQ125C

Broader/deeper multi-sensor work → PQ125D

Difficult/deep applications requiring tracer gas → PQ125E

The appropriate choice depends on the pipeline environment, sensor requirement, expected depth and detection method.

26. PROFESSIONAL B2B PROCUREMENT

Available for professional and commercial procurement.

For quotation, please provide:

1. Required model

2. Application - indoor / outdoor / mixed

3. Approximate pipeline depth

4. Pipe material

5. Pipeline type

6. Quantity required

7. Delivery city and country

We can then confirm:

• Exact model

• Sensor configuration

• Included accessories

• Warranty

• Lead time

• Shipping method

• Applicable taxes/duties

• Final delivered quotation

27. FAQ

What is the maximum depth of the PQWT PQ125 Series?

The manufacturer-stated depth varies by model. PQ125A is specified at 0.5 m, PQ125B and PQ125C at 3 m, PQ125D up to 6 m, and PQ125E up to 8 m with its tracer-gas configuration.

Is PQ125E only a water leak detector?

PQ125E combines acoustic pipeline leak detection with tracer-gas detection and is intended for difficult indoor/outdoor leak-location applications.

Which model is for indoor plumbing?

PQ125A is the dedicated indoor configuration. PQ125C, PQ125D and PQ125E also support indoor applications.

Which model is for outdoor underground pipelines?

PQ125B is focused on outdoor applications, while PQ125C, PQ125D and PQ125E provide broader indoor/outdoor capability.

Does PQ125E detect leaks at exactly 8 metres in every situation?

No. 8 m is the manufacturer-stated measurement capability for the PQ125E tracer-gas configuration. Actual performance depends on site and pipeline conditions.

Does the machine work without internet?

The system includes edge/local signal analysis capabilities, and the manufacturer describes real-time analysis without network connection. Field operation should still follow the supplied model's manual and sensor procedure.

Does the PQ125 have a touchscreen?

The supplied specification identifies a 7-inch LCD display. Touchscreen functionality should be confirmed for the exact supplied configuration before it is advertised as a guaranteed feature.

How long does the battery last?

Manufacturer-published specifications indicate up to approximately 8 hours of working time, depending on operating conditions.

What is the warranty?

The stated warranty is 2 years. Final warranty terms should be confirmed in the commercial quotation.

Can the product be OEM/customized?

OEM/customized support is subject to the manufacturer's available configuration, quantity and commercial terms.

Can it detect leaks through concrete or underground surfaces?

The system is designed for pipeline leak detection in various indoor and outdoor conditions, but actual signal transmission depends on the pipe, surface, soil, pressure, depth and environmental noise.

Is the 8 m specification applicable to all five variants?

No. The 8 m manufacturer-stated capability applies to PQ125E with its tracer-gas configuration.

Can I buy only the host machine?

The recommended configuration is to purchase the complete model-specific system because the sensors are an important part of the detection system.

Request a Professional Quote

Choose the PQ125A, PQ125B, PQ125C, PQ125D or PQ125E configuration according to your pipeline environment and detection requirement.

For commercial procurement, contact us with your required model, quantity, application and delivery location for model confirmation and quotation.