Products / Pig signaler / Dual Type

Pig signaler — Dual Type

Dual bi-directional pig signaler LS2S-TQZ

Combines a mechanical flag with a digital electrical output for local and remote pig-passage confirmation.

Product overview · Dual Type

Description

LINESIG Bi-Directional Pig Signalers are pipeline-mounted detection devices designed to provide positive indication when a pig passes through a pipeline in either direction.

The LINESIG Dual Bi-Directional Pig Signaler combines a conventional mechanical flag with an electrical/digital switching output.

When the pig passes the sensing point, the mechanism simultaneously operates the local mechanical flag and activates the electrical signal contact for remote indication — giving both field confirmation and centralized monitoring through PLC, SCADA, DCS, ESD or terminal automation systems.

LineSig LS2S-TQZ dual-type pig signaler with digital output

Design

Key features

  • Bi-directional pig detection
  • Mechanical flag indication
  • Digital electrical output
  • Local + remote indication
  • Suitable for PLC/SCADA integration
  • Positive pig-passage confirmation
  • Manual or configured reset arrangement
  • Industrial switch enclosure
  • Hazardous-area options
  • Potential-free contact output options
  • SS316 wetted parts available
  • Suitable for automated pigging systems

Installation benefits

  • Eliminates uncertainty regarding pig passage
  • Reduces unnecessary pipeline opening
  • Improves pigging sequence control
  • Supports safer launcher/receiver operation
  • Enables remote status confirmation
  • Supports automated valve sequencing
  • Improves pipeline operational records

Technical specification

Specifications

Detection directionBi-directional
Pipeline size range4 in to 48 in
Maximum working pressureUp to 25 bar
Temperature range−20°C to +120°C
Wetted partsSS316
InstallationPipeline / pig launcher / pig receiver
Detection principleIntrusive mechanical trigger
ResetManual / project-specific
Process connectionProject / pipeline dependent
Hazardous area certificationAvailable subject to selected electrical configuration

Materials

Wetted triggerSS316
Wetted shaftSS316
Process sealing componentsService-compatible material
External housingCarbon steel / stainless steel / project-specific
FlagCorrosion-resistant metal
FastenersStainless steel / project-specific

How it works

Operating principle

Normal position: before pig passage, the intrusive trigger projects into the pipeline bore while the flag remains in its normal indication position.

Pig contact: as the pig passes, it contacts the sensing element. Because the mechanism is designed for bi-directional operation, pig movement from either upstream or downstream direction can actuate the device.

Indication: Pig Passage → Flag Changes Position + Electrical Contact Changes State

Reset: following confirmation of pig passage, the mechanism can be reset according to the selected design.

Digital output

Electrical output — Dual Type

Depending on the selected configuration, the digital section may provide:

  • Dry contact
  • SPDT contact
  • DPDT contact
  • Proximity switch
  • Limit switch
  • NAMUR-type proximity output
  • 24 VDC switching interface
  • Relay interface

Final output type must be defined in the electrical datasheet rather than assumed as universal across all versions.

Control system integration

The Dual Type can interface with PLC, SCADA, DCS, ESD, Terminal Automation Systems, Pipeline Monitoring Systems and Pig Tracking Systems. Typical status tags include:

  • Pig Passed
  • Pig Arrival
  • Pig Departure
  • Signaler Activated
  • Signaler Reset
  • Device Fault, where supported by the selected electrical arrangement

Where it's used

Typical applications

  • Crude oil pipelines
  • Natural-gas pipelines
  • Refined-product pipelines
  • Aviation-fuel lines
  • Petroleum terminals
  • Tank farms
  • Refineries
  • Petrochemical facilities
  • Cross-country pipelines
  • Marine loading terminals
  • Pipeline pumping stations
  • Pigging stations

Typical installation locations

  • Pig launcher — Installed downstream of the launcher to confirm that the pig has successfully entered the pipeline.
  • Pig receiver — Installed upstream of the receiver to confirm pig arrival.
  • Intermediate pipeline location — Used where operational procedures require confirmation that the pig has passed a specific pipeline section.
  • Bidirectional pipeline — Particularly suitable where pigging operations can occur in either direction.

Downloads

Documents

Flyer PDF Digital signaler datasheet PDF

Ordering information

What to send us for a quote

  • Pipeline nominal size
  • Pipe schedule / wall thickness
  • Design and operating pressure
  • Design and operating temperature
  • Pipeline product
  • Pig type and travel direction
  • Flag Type or Dual Type
  • Process connection
  • Wetted and seal material
  • Reset arrangement
  • Hazardous-area classification
  • Cable entry / gland specification, coating and required certification