ClampOn DSP PIG Detector

Non-Intrusive PIG detection for pipeline integrity and monitoring

The ClampOn DSP PIG Detector is a cutting-edge, non-intrusive system designed to detect the passage of PIGs (Pipeline Inspection Gauges) in oil, gas, and multiphase pipelines. Using advanced ultrasonic acoustic technology, magnetic sensing and Digital Signal Processing (DSP), it delivers accurate, real-time detection - without requiring any modifications to the pipeline or the PIG itself. It is available in both topside and subsea versions.

What is PIG detection and why do you need a PIG detector?

PIG detection is the process of identifying when a PIG (Pipeline Inspection Gauge) enters, passes through, or arrives at specific points in a pipeline. PIGs are essential tools used for cleaning, inspecting, and maintaining pipelines in both offshore and onshore environments.

A PIG detector - also known as a PIG signaller - is used to confirm the PIG’s movement in real time. This is critical for:

  • Verifying successful PIG launch and arrival
  • Monitoring PIG passage at key points along the pipeline
  • Preparing receiving valves in advance
  • Detecting debris pushed ahead during cleaning
  • Avoiding lost PIGs and unplanned shutdowns
  • Enhancing pipeline integrity and operational safety
  • Reducing maintenance costs and downtime

Without a reliable PIG detection system, operators risk delays, safety hazards, and costly interruptions. The ClampOn DSP PIG Detector provides a proven, non-intrusive solution that ensures accurate, real-time PIG detection - improving both safety and efficiency.

ClampOn DSP PIG Detector on pipeline

How the ClampOn DSP PIG Detector works

The ClampOn DSP PIG Detector uses passive ultrasonic acoustics to “listen” for the unique sound signature of a PIG moving through the pipeline. The sensor is clamped directly onto the pipe surface - no welding, drilling, or shutdown required. It detects all PIG types, including scrapers, spheres, foam and smart/intelligent pigs.

With DSP technology, the sensor operates across multiple frequency ranges simultaneously, filtering out background noise from flow, valves, and mechanical impacts. This ensures precise detection in oil, gas, and multiphase environments.

Detection logic can be handled either within the sensor or via ClampOn’s software, which enables:

  • Real-time signal output: “PIG passed”
  • Full data logging and timestamping
  • Visual trending and debris monitoring
  • Remote configuration and diagnostics

Key benefits of the ClampOn DSP PIG Detector

  • Non-intrusive installation – No pipeline penetration; simply clamp onto the pipe
  • Real-time detection – Immediate alerts when a PIG passes
  • Detects all PIG types – Scrapers, spheres, foam and intelligent/smart PIGs, and more
  • Acoustic and magnetic sensing – Dual detection modes for reliability
  • Compact and lightweight – Easy to install and relocate
  • Plug-and-play setup – No field specialists required
  • Remote accessibility – Configure and analyze data from anywhere
  • Standalone or integrated – Operates independently or connects to control systems
  • Ex d / Ex i certified – Safe for hazardous environments
  • 30-year design life – Built for long-term performance
  • Flexible integration – RS485, 4–20mA, DPDT relay, VFC outputs
  • Debris indication – Monitors debris pushed ahead during cleaning
  • Smart sensor technology – Enables advanced diagnostics and tuning
  • No production shutdown needed – Ideal for retrofit installations
  • Reliable PIG signaller functionality – Ensures accurate PIG passage confirmation

ClampOn DSP PIG Detector

Applications for ClampOn DSP PIG Detector

The ClampOn DSP PIG Detector is designed for versatile use across a wide range of pipeline systems and environments:

  • Offshore pipelines – Ideal for subsea PIG detection and remote monitoring
  • Onshore pipelines – Used in refineries, terminals, and land-based transport systems
  • Multiphase flow systems – Reliable detection in complex flow conditions
  • Pipeline cleaning operations – Monitors PIG passage and debris movement
  • Pipeline inspection campaigns – Confirms PIG location and progress
  • Retrofit installations – Easily added to existing infrastructure without shutdown
  • Greenfield projects – Integrated into new pipeline designs from the start
  • Hazardous environments – Certified for use in Ex d / Ex i zones
  • Temporary monitoring setups – Lightweight and portable for short-term use
  • SCADA/DCS integration – Seamlessly connects to control systems for automated alerts

Acoustic detection logic

Detection logic in PIG detector itself

  • Stand alone system
  • Interface directly to DCS: "PIG passed"

Detection logic in computer software

  • Records all raw-data
  • Records and time stamp all PIG passing's
  • Adjustment of detection criteria
  • Visual trending of PIG passing - including debris

Integration & operation

The ClampOn PIG Detector can be used as a standalone unit or integrated into your control system. It supports:

  • Digital RS485 interface (Modbus RTU, ClampOn DSP Protocol)
  • Relay
  • Analogue 4–20mA interface
  • Digital output (Volt Free Contact)

Using ClampOn’s software, operators can easily configure detection settings, log data, and analyze trends for optimal performance - even under unstable flow conditions.

Why choose ClampOn?

ClampOn is a trusted name in pipeline monitoring, with over 30 years of experience in developing non-intrusive sensor technology for the global energy industry. Our commitment to innovation, reliability, and customer support sets us apart.

  • Proven Technology – Used by leading operators worldwide in both topside and subsea environments
  • Global Expertise – Installed on thousands of pipelines across continents
  • Intelligent Sensors – Built-in diagnostics and remote tuning capabilities
  • Safety First – Certified for use in hazardous areas (Ex d / Ex i)
  • Performance-Driven – Designed to improve pipeline integrity and reduce costs
  • Customer-Centric – Dedicated support and training from experienced engineers
  • Flexible Solutions – Tailored to fit new installations or retrofits without disrupting operations

ClampOn continues to lead the way in smart PIG detection, helping operators maintain safe, efficient, and cost-effective pipeline systems.

ClampOn DSP PIG Detector mounted

Summary

The ClampOn DSP PIG Detector is the industry-leading solution for non-intrusive, real-time PIG detection. With advanced DSP technology, acoustic and magnetic sensing, and seamless integration capabilities, it ensures safe, efficient, and cost-effective pigging operations - onshore, offshore, and subsea.

7 August 2025

Author: Tonje Dahl