E-Saximeter (E-SAX)

Handheld instrument registering relevant pile driving parameters, calculating diesel hammer stroke or hammer blows per minute (BPM), for an accurate pile driving log.

  • Counts hammer blows, and equivalent blows per minute for all hammer types; calculates stroke height for diesel hammers
  • Provides a drive log of blow count as a function of depth
  • Results are downloaded from the E-SAX to your computer
  • Optional accessories allow for impact velocity measurements to compute kinetic energy and depth measurements
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The E-Saximeter registers all relevant pile driving parameters. It calculates the hammer operating rate in blows per minute and helps the piling inspector create a pile driving log. For single acting, open-end diesel hammers the E-Sax also displays the hammer potential energy and ram stroke. This measurement is important since excessive stroke can cause pile damage.

The E-Sax is a handheld instrument. In its basic configuration, the pile inspector observes the driving process and pushes a button for every depth increment as driving progresses. Several accessories further enhance the functionality of this time-tested sound recognition device including:

  • Proximity switches installed on the driving hammer and a wireless transmission system (transmitter attached to the driving hammer and E-Sax internal transceiver) enable the E-Saximeter to compute the hammer kinetic energy. Kinetic energy may be input to the GRLWEAP pile driving simulation software to fine-tune the driving criteria.
  • A depth measurement reel with wireless transmission capabilities eliminates the need for manual depth increment input, automating the entire creation of the driving log.



“Energy monitoring was specified in the (Woodrow Wilson Bridge) contract Special Provisions. The main benefit of the monitoring is for the Virginia Department of Transportation to have more accurate driving logs than are typically created by hand. When correlated with the PDA results, it allows driving criteria to be in terms of hammer energy instead of blows per foot at a certain stroke.” 

– Ryan G. Gorman, P.E., Project Manager, Corman Construction, Inc.


(Note: PDA is the Pile Driving Analyzer® – the E-Sax can assess hammer potential and kinetic energy, while the PDA calculates the energy actually transferred to the pile)

E-Saximeter Specifications

January 2012
PDF Format

Main Unit:

  • Size: 100mm X 190mm X 50mm
  • Weight: 0.54kg
  • Temperature range: 10 to 40°C operating -10 to 65°C storage
  • Power: Built-in rechargeable battery with 16 hour minimum duration
  • Display: LCD, 4 lines X 16 characters, viewing area 62mm X 26mm
  • Keypad: Large Key (1.27mm²), non tactile


  • 32 bit CICS Micro CPU up to 50MHz
  • 10 bit 2 channel analog to digital converter; 8 bit 2 channel digital to analog converter
  • Internal microphone 70 to 115 dB
  • Standard Type A USB drive for data transfer
  • 8 MB internal Magnetoresitive RAM

Functional and Other:

  • Maximum blow detection rate: 68 bpm for open end diesel hammers; 300 bpm for all others
  • Operates in English or SI units
  • Full one year warranty
  • Technical manual included

Optional Depth Measurement Unit:

  • Installation: mounts on crane, cable attaches to hammer
  • Size: 305mm X910mm X 910mm
  • Weight: 73kg
  • Resolution: 0.6mm Max range: 49m
Optional Energy Switches (pair of proximity switches, available in 3 types):
Functionality Normally open Normally open Normally closed (for special applications)
Size (diameter x length) 18mm x 50mm 30mm x 50mm 30mm x 30mm
Weight: 114 g 205 g 182 g
Switching Frequency: 200 Hz 650 Hz 200 Hz
Sensing range 10 mm 10 mm 15 mm
Repeatability .01 mm .01 mm .01 mm

Installation: mounts on hammer

  for Optional Energy Switches: for Optional Depth Measurement Unit:
Installation: mounts on hammer mounts on depth sensor
Size: 90mm X 125mm X 32mm 64mm X 98mm X 34mm
Weight: .54kg .46kg
Data transmission: via a standard radio protocol
Frequency Range: 2.402 ~ 2.480 GHz
Max range: 100m
Electronic: Low power 16 bit processor with 12 bit analog to digital converter and 12 bit digital to analog
Power: Built-in rechargeable battery w/8 hour min
supplied by +12V to +24V crane battery
Temperature range: 0 to 40°C operating; -10 to 65°C storage

E-SAX Accessories


  • Battery Charger for Esax 2009/2011
  • Battery Charger for Esac 2009/2011 – Sn 050000
  • Saximeter Starter System
  • Battery Pack ES-BP-N-001