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
Have a technical question?
Ask our team of engineers.

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)

ESAX Technical 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 Magnetoresistive RAM



Maximum Blow Detection Rate: 68 bpm for open end diesel hammers; 300 bpm for all others
Operating Units: English or SI
Full one-year warranty
Technical manual provided in PDF form on a USB drive


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)

Installation: Mounts on hammer

Size (diameter x length): 18mm x 50mm30mm x 50mm30mm x 30mm

Functionality Normally Open Normally Open Normally closed (for special applications)
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



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 via a standard radio protocol
Frequency Range 2.402 ~ 2.480 GHz 2.402 ~ 2.480 GHz
Max Range 100m 100m
Electronic Low power 16-bit processor with 12-bit analog to digital converter and 12-bit digital analog converter Low power 16-bit processor with 12-bit analog to digital converter and 12-bit digital analog converter
Power Built-in rechargeable battery w/ 8-hour min. duration Supplied by +12V to +24V crane battery
Temperature Range 0 to 40°C operating; -10 to 65°C storage 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