The FAI SPI-ULTRA501 (Passive) is a fully ATEX and IECEx certified, non-intrusive scraper pig detector which quickly and accurately detects, signals, and logs the passage of scraper at critical points along a pipeline both on land and offshore.

Key benefits of non-intrusive pig detector

  • Use of the SPI-ULTRA501 can result in time and therefore cost savings during pigging operations.
  • Removes any uncertainty over confirmation of scraper passage.
  • Quick and easy installation using ratchet straps or steel banding.
  • Minimal set up required ensuring time is not lost setting up multiple parameters.
  • Suitable for all scraper types – no transmitter or magnets are required to confirm passage or location in the receiver.
  • Suitable for gas and liquid pipelines.
  • Main housing can be mounted remotely for use on buried pipelines or where access if limited.

The SPI-ULTRA501 monitors the acoustic emissions created by the vibrational and acoustic noise generated as a pig moves through a pipeline. The unit then processes the emissions to identify the signature of a passing scraper.

Events are signalled as they occur via a graphical display and high brightness LED. The unit logs the time and date of up to 99 events. Logged events can be viewed locally on the display or transmitted remotely over several optional interfaces. The user can turn the unit ON and OFF as well as modify several settings using the single control button and intuitive menu system.

The SPI-ULTRA501 has two basic parts, main housing and sensor. The sensor is permanently connected to the main housing via a cable and can be quickly and easily attached to the pipeline using ratchet straps or steel banding. The main housing contains all electronics, display and the control button and can be mounted onto the pipeline using a mounting plate and straps in a similar fashion to the sensor or mounted on a wall or post.



Battery Type 7x Alkaline DURACELL ID1300 cells
Battery Life (Alkaline) 15 days (LISTENING/LOW POWER MODE at +20°)
Battery Type 7x Lithium SAFT LS33600 cells
Battery Life (Lithium) 30 days (LISTENING/LOW POWER MODE at +20°)
External Supply 24.0VDC, <2.0W
Entries (other options available) 4x M20x1.5
Housing Temperature Range
(External Supply)
-40°C to + 85°C (-40°F to + 185°F)
Housing Temperature Range (Alkaline) -20°C to + 54°C (-40°F to + 130°F)
Housing Temperature Range (Lithium) -40°C to + 85°C (-40°F to + 185°F)
Sensor Temperature Range -55°C to + 110°C (-67°F to + 230°F)
Maximum Pipeline Surface Temperature +110°C (+230°F)
Typical Minimum Pig Speed 0.1 m / see NOTE 1
Main Housing Ingress Protection IP66
Sensor Ingress Protection IP68
ATEX/IECEX Code Ex II 1 / 2 G
IECEx Code Ex d ia [ia Ga] IICT4… T6 Gb
EU Type Examination Cert No. TRAC 13 ATEX 0008X
IECEx Cert No. IECEx TRC 13.0006X
Weight in Aluminium 8kg (17.6lbs)
Weight in 316L Stainless Steel 13kg (28.7lbs)
Length (including mounting plate) 240mm (9.4”)
Width (including mounting plate) 192mm (7.6”)
Height 174mm (6.9”)


DPDT Relay (Volt Free Contacts) 2A @ 30VDC NOTE 2
Current Loop Output 4-20Ma NOTE 3
Serial Data Interface RS485 MODBUS

NOTE 1: Minimum scraper speed depends on pig type, pipeline configuration and installation position.
NOTE 2: DPDT is equivalent to 2x SPDT
NOTE 3: Current loop levels are configurable between 4Ma and 20Ma. Default set state 20.0Ma. Default set state 20.0Ma. Default reset state 4.0Ma. Tolerance between +/- 1.0mA.