Description

What Is Pig Signaller Intrusive Type?

The pig signaller intrusive type is a flange-mounted detection device. It monitors pig passage in pipeline systems. This device provides reliable position confirmation. It features adjustable insertion depth. The design accommodates flange height variations.

EMT manufactures this intrusive type pig signaller. We design it for oil and gas pipelines. The device installs on pipeline flanges. It detects pig passage accurately. The flag indicator rotates when pig passes.

This device offers multiple display options. Customers choose based on monitoring needs. B-type shows visual indication only. C-type adds electrical switching output. D-type includes terminal box for wiring. Each variant maintains high reliability.

How Does It Work?

The device uses a mechanical trigger that extends into the pipeline. When a pig passes, it pushes the trigger, rotating the flag indicator from horizontal to vertical — giving operators an immediate visual confirmation of pig passage.For remote monitoring, C-type models include SPDT or DPDT switches that connect directly to monitoring systems, recording pig passage time accurately. No external power supply is required.The adjustable design allows technicians to set insertion depth precisely, with a 20mm adjustment range to accommodate various flange configurations and ensure correct trigger positioning every time.

Unidirectional vs. Bidirectional  Pig Signaller

Unidirectional Type

The unidirectional adjustable pig signaller detects pig passage in one flow direction only. It suits simple pipeline configurations and requires minimal installation time. The adjustment mechanism is straightforward, allowing technicians to complete installation quickly.

Advantages

• Lower equipment cost — suitable for budget-limited projects
• Reduced mechanical complexity — easier and faster troubleshooting
• Minimal operator training required
• Long-term proven reliability

Disadvantages

• Requires a clearly defined, consistent flow direction
• Cannot detect pig passage if flow reverses
• Not suitable for complex pipeline networks
• Cannot adapt to process flow changes

Bidirectional Type

The bidirectional adjustable pig signaller detects pig passage in both flow directions. It suits complex pipeline networks where reverse flow occurs. The trigger mechanism operates automatically in either direction, eliminating the need for manual reconfiguration.

Advantages

• Greater operational flexibility for complex pipeline networks
• Automatic reverse flow detection — no manual intervention required
• Saves operational time and labor costs
• Better adaptability to process flow changes

Disadvantages

• Higher initial equipment cost
• More complex internal structure
• Installation and commissioning require greater technical expertise
• More intensive operator training needed
• Maintenance inspections are more complex and time-consuming

What Makes It Special?

Adjustable Insertion Depth: The device features 20mm adjustment range. This accommodates various flange configurations. Technicians customize the installation easily. They achieve optimal trigger positioning every time. The adjustment mechanism is simple and reliable. It requires only basic tools.

Multiple Display Options: Three display types serve different operational needs. B-type provides flag indication only. C-type adds switching output for automation systems. D-type includes terminal connections for wiring. Customers select based on their monitoring requirements.

Bidirectional Detection: Some models detect pigs in both flow directions. This increases operational flexibility significantly. Operators monitor pig movement efficiently. The system supports complex pipeline networks. Reverse flow detection works automatically. No manual reconfiguration is necessary.

Maintenance-Free Operation: The MFOI design eliminates dynamic seals completely. This reduces leakage risk substantially. The design supports online inspection. Pipelines remain operational during maintenance checks. No shutdown is required for routine inspections. This saves time and money.

High Pressure Rating: The device handles CLASS 150 to CLASS 2500. It meets ANSI B16.5 standards strictly. This ensures safe operation always. High-pressure systems require reliable equipment. EMT tests every unit before delivery. Quality control is our top priority.

What Specifications Does It Have?

Parameter	SN2-TQZ-FADJ	SN2-TQZ-Byxxx-AJ20
Connection Type	Flange only (2″ spec)	Flange connection
Pressure Rating	CLASS 150~2500	Per ANSI B16.5
Adjustment Range	20mm maximum	20mm (AJ20)
Display Options	B, C, D types	B, C types
Trigger Action	Flag rotation	Bidirectional
MFOI Support	Yes (low leakage)	Yes (maintenance-free)
Temperature Range	-29°C to +120°C	-29°C to +120°C
Material Options	Carbon steel / SS	Carbon steel / SS

 

Technical Details:

• Model SN2-TQZ-FADJ: Unidirectional/bidirectional adjustable type
• Model SN2-TQZ-Byxxx-AJ20: Bidirectional, maintenance-free design
• Medium compatibility: Most pipeline media (check for solidification)
• Trigger action: Flag rotates 90 degrees when triggered
• Electrical connection: No external power required (C-type)
• Flange standard: ANSI B16.5 or equivalent (custom available)
• Seal material: Selected based on medium type and temperature
• Installation: Flange connection with adjustable insertion depth
• Flag indicator: Visual confirmation of pig passage
• Output signal: Switch contact for remote monitoring systems

Why Choose EMT?

Shenyang EMT Piping Technology manufactures pipeline equipment. We specialize in pigging systems. Our products serve oil and gas pipelines worldwide. What more,we also hold ASME U Stamp certification. Our website provides technical documentation and support. Customers access installation guides online easily.

EMT provides complete pigging solutions. We manufacture pig signallers, pig detectors, and cleaning pigs. Our team understands pipeline operations deeply. We design products for maximum reliability. We test every device before delivery. Our engineering team speaks English fluently.We respond to inquiries promptly and professionally. We deliver solutions that meet exact specifications. Contact us for technical consultation today. We support your pipeline operations.