Model M Chart Recorder

The Echometer Model M is used in conjunction with an acoustic gas gun to determine the distance to the liquid level in the casing annulus or tubing of a well. A pressure pulse is generated from a gas-gun wellhead attachment that is connected to the surface casing annulus valve. The pressure pulse travels down the casing annulus gas and is reflected by collars, the liquid level and other obstructions. A microphone in the wellhead attachment converts the pressure pulses into electrical signals that are amplified, filtered and recorded on a strip of paper. The record displays the tubing collars from the surface to the liquid level and hence the liquid level depth can be determined by counting the number of tubing collar reflections to the liquid level reflection.

The Model M instrument consists of an analog/digital amplifier-recorder and a dual-channel paper chart recorder. One channel (Liquid Level) is used to optimize the reflection from the liquid level and other large downhole anomalies. The second channel (Collars) is used to optimize the response from the tubing collars and other small downhole anomalies.

Hamdon Energy Solutions carries most units in stock and can usually ship within 2-4 days.


  • Stand-alone acquisition instrument.
  • User-friendly operation.
  • Lightweight and portable.
  • Acoustic trace prints out on strip chart paper.
  • Dual channel recorder.
  • Automatic gain setting and control.
  • One second timer with date stamp.
  • Built-in self-test.
  • Operates from self-contained 12V rechargeable lead-cell battery or 12V external outlet.
  • CSA or ATEX certified available.


  • Compact Plastic Case
  • 5' Microphone to Amplifier Cable
  • 110/220 VAC Automatic Battery Charger
  • 12 VDC Automobile Cigarette Lighter Power Cord
  • 11 Point Dividers
  • 10 Rolls of Paper
  • 200 PSI Gauge with Quick Connector
  • Set of O-Rings / Miscellaneous Parts
  • Comprehensive Operating Manual
  • 5 lb. CO2 or N2 cylinder unless other option requested
  • Hose and Filler Connector Supplied for CO2 and N2 Cylinders
  • Shipping Dimensions: 15 x 15 x 18”
  • Approximate shipping Weight 50 lbs (shipped in one crate)

Well Analyzer vs. Model M: Advantages & Disadvantages

The computerized Well Analyzer is capable of obtaining a complete well analysis with minimal time and effort on the part of the operator, however, the operator must be familiar with the computer and software operations. SeniorTech/Hamdon offers a variety of training and seminars to help familiarize operators with equipment function and operations. The Model M strip chart instrument is more simple to operate but cannot perform dynamometer measurements, motor power-current analysis and unattended pressure transient data acquisition and analysis and thereby delivers a less complete view of a well's operation.