Uni-Tec® Pig Passage Indicators

Uni-Tec® Mechanical Pig Passage Indicator

Uni-Tec® Model 200-S mechanical sphere and pig passage indicator featuring the use of a visual flag. The detector indicates the passage of a pig when the flag becomes visible through the view-port. Attached to the pipeline by welding a mounting base, the detector will function under all pressures, products, gas and is pressure balanced without the use of dynamic seals. The unit is designed for installation in existing pipelines in service and under pressure or for new pipelines. Utilizing stainless steel components combined with welding, the detector has only one moving part (the probe) thus insuring its continuous operation without maintenance.

  • Units are provided with standard welded base properly scarfed to specified pipe diameter. Flanged and Weld-O-Hub mounting are also available.
  • Extension shafts are available for underground installations or insulated pipes (Model 200-SE).
  • Extended trigger mechanisms are available for oversized sections of pig launchers and receivers (Model 600-S).
  • Extended trigger mechanisms are also available with moisture barrier o-ring and pipe cap for harsh environments (Model 600-SO).
The detector switch assembly is hydrostatically tested at the factory to a minimum of 3000 psi. Higher test rating available upon request.

Mechanical Detector Assembly Patent No. 3478717

Select Model:
Model 200-S passage indicator   
Model 200-SE with extension shaft (Please specify extension length below)  
Model 600-S with extended trigger   
Model 600-SO with extended trigger & o-ring   
Quantity: Product Service: Pipe Size: Wall Thickness: Please complete Inquiry in Email Form section


Uni-Tec® Electrical Pig Passage Indicator

Uni-Tec® Model 178-DS electric pig passage indicator features the use of a Model 100-S detector. The indicator is actuated when a pigging cup, polyurethane foam pig or sphere in passing causes the detector probe that extends into the ID of the pipe to be displaced. The indicating light will stay on held by an internal relay providing remote status contacts and remote electric reset. The unit may be locally manually reset and tested by means of the "Test / Reset" switch. Units come in 24VDC or 120VAC models.

  • Extension shafts are available for underground installations or insulated pipes (Model 178-DSE).
  • Extended trigger mechanisms are available for oversized sections of pig launchers and receivers (Model 578-S detector).
  • Special keying and tolerances available for Meter Prover applications.
Select Model:
Model 178-DS with Indicating Light, Test / Reset switch   
Model 178-DSE as above with extension shaft (Please specify extension length below)  
Model 578-DS asabove with extended trigger   

Quantity: Product Service: Pipe Size: Wall Thickness: Please complete Inquiry in Email Form section  24VDC    120VAC
 Meter Prover Application
Please complete Inquiry in Email Form section


Uni-Tec® Pig Passage Counter

Uni-Tec® Model 178-DSC pig passage counter features the use of a Model 100-S detector. The counter will increment and the passage light will come on when a pigging cup, polyurethane foam pig or sphere in passing causes the detector probe that extends into the ID of the pipe to be displaced. The passage indicating light will stay on until locally reset by means of the "Test / Reset" pushbutton. Units come in 24VDC or 120VAC models.
Select Model:
Model 178-DSC with Indicating Light, Test and Reset switches   
Model 178-DSCE as above with extension shaft (Please specify extension length below)  
Model 578-DSC as above with extended trigger   


Uni-Tec® Model 100-SC pig passage counter accessory features the use of a Model 100-S detector. The counter will increment when a pigging cup, polyurethane foam pig or sphere in passing causes the detector probe that extends into the ID of the pipe to be displaced. The unit may be manually reset and tested by means of the "Test / Reset" mechanisum. Units come in 24VDC or 120VAC models.

Select Model:
Model 100-SC with Test / Reset button   
Model 100-SCE as above with extension shaft (Please specify extension length below)  
Model 500-SC as above with extended trigger   

Quantity: Product Service: Pipe Size: Wall Thickness: Please complete Inquiry in Email Form section  24VDC    120VAC
Please complete Inquiry in Email Form section