Plunger Velocity Sensor

Sasquatch sensor

Brochure Case Study

Sasquatch is the next stage in the evolution of plunger detection. The unique design of Sasquatch is based on the proven technology behind the Cyclops® plunger arrival sensor.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. Hoping to avoid these issues, producers replace lubricator springs and plungers on a regular basis. In many cases, perfectly good equipment is being prematurely discarded, leading to wasted labor and equipment costs. Sasquatch gives you the power to reduce or even prevent these occurrences and prolongs the life of wellhead equipment by enabling detection of fast plungers long before they cause problems.

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. A patented algorithm quickly and accurately measures the surface velocity of a plunger as it travels by the sensor. If plunger mass is provided, Sasquatch can calculate kinetic energy, then alarm on a set number of hard hits or a single dangerous hit. Kinetic energy can also be used to alarm on exceeding a total amount of kinetic energy (spring wear) or total number of hard hits.Sasquatch acts as a Modbus Slave, with an integrated RS-485 communications port. No SCADA? No problem! Up to 120 arrivals with date, time and velocity information are available to download right from the unit on-site. For best results, use Sasquatch in conjunction with the ALiEn²’s patented Adaptive Seeking Velocity Optimization™ to improve production. This intuitive algorithm reduces the need for operator intervention by making adjustments that are proportional to the current flow/close time.

ETC’s innovative line of plunger sensors provide advantages that no other plunger sensors offer, such as the ability to adjust sensitivity, upgrade software, and use real time data to troubleshoot problematic wells.

Note: Sasquatch works by watching ferrous plungers travel past the sensor. Fully titanium, stainless steel, and other non-ferrous plungers will not work reliably with Sasquatch.

Documentation and Software

Sasquatch is can be integrated with ABB and ROC controllers. Click here for more information.


  • Record Plunger Surface Velocity in Real Time
  • Calculate Kinetic Energy
  • Intrinsically Safe
  • Wireless Solution Available
  • -40°F to +160°F Operation
  • 5 V to 24 V Operating Voltage
  • Low Power
  • Adjustable Sensitivity
  • Built in Alarms
  • Self Calibrating
  • Rugged Watertight Aluminum Enclosure
  • Built-in Mounting
  • 1/2” NPT Port
  • Remote Communication via Modbus



Supply Voltage 5 V – 24 V DC
Current Draw Typ. – 7.5 mA, Max. – 8 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)

Model: ET-11000-1030-0000
• Class 1, Division 2, Groups A, B, C and D T4
• Class 1, Zone 2, Group IIC T4

Model: ET-11000-1031-0000
• Class 1, Division 1, Groups C, D T4
• Class 1, Zone 0, Ex ia IIB T4 Ga
• Class 1, Division 2, Groups A, B, C and D T4
• Class 1, Zone 2, Group IIC T4


ETC Cyclops Hawkeye Plunger Sensor

Cyclops Plunger Arrival Sensor

Utilizing modern Geomagnetic Sensing Technology™, Cyclops is the most advanced and reliable plunger sensor available.

More Info

plunger diagnostic kit

Upgrade, Test & Troubleshoot Sasquatch with Vision Software

‘See what Sasquatch sees’ with this free tool. Product updates, documentation, testing & troubleshooting for ETC sensors and controls.
More Info

Where to Buy

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.

Read More

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