Application

This is an omni trigger operated unit. The principle feature consists of a magnetic link between two packs of rare earth magnets.

The trigger is omni-directional and may also be actuated upwards as a plunger. When the trigger is actuated (very low torque is required) a follower mechanically moves a magnet pack axially in the signaller body. The magnet pack is strongly linked to a second magnet pack and shaft which move axially within an unpressurised housing.

The movement of the shaft operates a visual, manual reset flag or activates a limit-switch (auto-reset), giving a positive indication that a pig or sphere has passed the signaller.

The flag or switch may be set such that it can be seen from any given direction.

Specification 

• Suitable for any pipe size from 3" norminal;
• Standard pressure range up to ANSI 900;
• Higher pressure range available to specification;
• NACE conformity;
• Principle feature of operation by rare earth magnets;
• Low-torque trigger;
• Internal moving parts stainless steel;
• All seals standard metric;
• 'O' rings viton unless otherwise specified.

Product guide

• The pig-sig. range is specifically designed, in concept and detail, to overcome the limitations of earlier signalling methods;
• The sensor probe (trigger) is omni-directional: it can neither damage pigs or spheres nor be damaged by their passage;
• Trigger has 100% free movement; therefore positioning of welding boss is unrestricted;
• Indicator flag is rotatable in 90° increments to obtain the most visible vantage;
• Available for use with foam and polly pigs;
• Positive action indicator flag is instantly reset;
• No moving seals, thus minimizing the possibility of product leakage from the pipeline;
• Simple concept - maintenance free;
• Easily adapted for existing welding connections to replace worn or defective units.