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The EMTx50 transmitter is an electromagnetic transmitter that can be used for pig tracking and locating functions, intended for use in pipeline diameters of around 16” and above

The transmitters operate effectively in every type of pipeline, i.e. top-side, buried, gas or liquid and in pipeline bundles where acoustic transmitters are either less effective or ineffective. The standard transmission frequency is 22Hz however the frequency is configurable between 10Hz and 30Hz. Once the approximate location of the transmitter has been established using an EM receiver with the antenna held parallel to the pipeline/transmitter, the exact location can be determined to within a few cm by orientating the antenna perpendicular to the pipe and detecting the inherent EM null spot of the transmitter. The EMTx50 series offers several activation methods including bleedscrew activation, magnetic activation, saltwater activation, pressure switch activation, delayed activation and vibration activation. These methods may be used individually or in combination.  The received signal strength is dependent on several factors and frequency, signal strength and transmission pattern can be configured to achieve the desired balance between detectability and battery life.

Key Benefits

  • Exact location of the transmitter can be determined to within a few cm by detecting theinherent EM null spot of the transmitter
  • Several activation methods designed to conserve battery life when deployed in advance of pigging operations.
  • Bluetooth connection and OEL’s EMTx CONFIG Application allows transmitter parameters such as pulse rate, pulse width and power output to be modified by the user providing flexibility to manage signal strength and battery requirements.
  • Mounting holes are built in to aid centralising the transmitter within a pig body, eliminating the need for a transmitter carrier, dramatically increasing the received EM signal


Batteries: Alkaline D Cell Pack
Battery Life at + 5°C in air:
Up to 365 days dependent on battery type and pulse rate
Standard Frequency:
Temperature Range:
-20°C to +50°C (-4°F to 122°F)
Housing Material:
ASTM B348 Grade 5 Titanium Ti-6Al-4V
Endcap Material:
UNS S32750 Super Duplex Stainless Steel
O-Ring Material:
548mm (21.6”)
132.4mm (5.2”)
Transmitter weight (including batteries):
25kg (55.1lbs)
External Pressure Rating:
500bar (7252Psi)
Standard signal at 1m with OEL reference antenna at + 5°C in air: