Sasquatch Plunger Velocity Sensor


Sasquatch is now fully integrated with ABB and ROC controllers! Click here for more information.


Sasquatch is the next stage in the evolution of plunger detection. As the first ever plunger velocity sensor, not only will Sasquatch signal that a plunger has arrived, velocity of the plunger will be measured at surface. Repetitive fast plungers are a common problem in plunger lift causing costly damage to equipment and production downtime . A lubricator breach can lead to incident reports, spills and injuries. Sasquatch gives you the power to prevent these occurrences by enabling detection of fast plungers long before they cause problems.

The unique design of Sasquatch is based on the proven Geomagnetic Sensing Technology™ behind the Cyclops® plunger arrival sensor. ETC’s innovative line of plunger sensors provide advantages that no other plunger sensors offer, such as the ability to adjust sensitivity, upgrade software, or troubleshoot problematic wells right at the well head.


Sasquatch is built to sustain extreme cold and hot temperatures, operating reliably from -40oC to +70oC (-40°F to +160oF). Sensitivity is adjustable to accommodate a wide range of plungers and lubricators, eliminating missed arrivals. An embedded micro-processor filters out environmental noise caused by nearby equipment or electrical storms, minimizing false detections. A rugged watertight aluminum enclosure protects Sasquatch from the elements, and built-in mounting provides snug and secure installation on a lubricator.



Sasquatch features a ½” NPT port to connect either a Teck connector and armored cable, or a standard cable gland and instrumentation cable. Sasquatch operates over a wide range of input voltages, simplifying inventory management.



Sasquatch is based on the trusted Geomagnetic Sensing Technology™ behind the Cyclops plunger arrival sensor. A proven patent-pending algorithm allows Sasquatch to quickly and accurately measure the surface velocity of a plunger as it travels by the sensor. Up to 120 arrivals with date, time and velocity information are available to download right from the unit on-site to ensure Sasquatch is watching even when your control system is not. For best results, use Sasquatch in conjunction with ETC’s patented Adaptive Seeking Velocity Optimization™ to improve production. This intuitive algorithm reduces the need for operator intervention (thus eliminating opportunities for human error) by making adjustments that are proportional to the current flow/close time. This method was used with average plunger velocity to double gas well production in a 2015 case study.



Sasquatch acts as a Modbus slave, with an integrated communications port to access current and historical information regarding plunger arrivals and velocity readings. This port also allows for communication with Vision™ Device Management software for testing & troubleshooting.

Certification Manual



ETC ALiEn plunger lift controllerALiEn² Plunger Lift Controller
ALiEn²’s intelligent and effective optimization algorithms will help you achieve maximum production.

More Info

etc iris wireless bridgeGo Wireless with Iris 
Replace traditional wire & trenching with the plug-and-play Iris Wireless Bridge.

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ETC Cyclops Hawkeye Plunger SensorCyclops Plunger Arrival Sensor 
Utilizing modern Geomagnetic Sensing Technology™, Cyclops is the most advanced and reliable plunger sensor available.

More Info

plunger diagnostic kitUpgrade, Test & Troubleshoot Sasquatch with Vision Software 
‘See what Sasquatch sees’ with this free tool. Product updates, documentation, testing & troubleshooting for ETC sensors and controls.

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Supply Voltage 5 V – 24 V DC
Current Draw Typ. – 9.05 mA, Max. – 13.3 mA
Switch Interface Dry contact, normally open, 100 Ω impedance
Communications Interface 2 wire RS-485 Modbus Slave
Range 50 m/min to 1,000 m/min (164 ft/min to 3,281 ft/min)
Accuracy +/- 8% @ 250 m/min (820 ft/min)
Operating Temperature -40°C to +70°C (-40°F to +160°F)

Class I, Zone 0, AEx ia IIC T4

Class I, Division 1, Groups A, B, C, D T4; Ex ia IIC T4

Class I, Zone 2, Group IIC T4

Class I, Division 2, Groups A, B, C, D T4

Where to Buy

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Case Studies

Major producer in South Texas uses ALiEn2 to achieve 16,000% ROI

The ALiEn2 plunger controller replaced a competitive controller on a plunger lift well that was not meeting production expectations. Production was doubled within 12 days and the well has continued producing at the higher rate since.

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Cyclops proves 100% accuracy, becomes standard for major producer in the San Juan Basin

The Cyclops sensor was installed on wells that were frequently missing plunger arrivals, leading to 100% reliable detection of the plunger.

Read More