Tekscan Wireless ELF 2
(Wireless Economical Load and Force System)

The Wireless ELF 2 System is a user-friendly, cost-effective load measurement system. This system combines 3 FlexiForce® WB201 sensors, battery-operated WiFi transmitter (certified 802.11b radio- 802.11b/g/n compatible), and Windows-compatible software*, turning your PC or laptop into a force measurement instrument. The WELF2 system, sampling rates up to 200 Hz and comes in a high speed version with sampling rates up to 6,000 Hz. The WiFi connection setup has ad hoc and access point (unsecured router) network capability. For multi-handle use an unsecured router is required.

*Compatible with Windows 7, 8, XP, and Vista

Wireless Force Measurement Features & Benefits:

  • Real-time data capture
  • Movie recording & saving
  • ASCII output to data analysis software
  • Multi-point calibration
  • Simple and storable calibration
  • Capability to tare a load
  • Adjustable sensitivity
  • Internal triggering
  • Displays in strip chart, column graph, or digital readout
  • Includes 3 AAA batteries. Battery life up to 5 hours
  • Connector compatible with all FlexiForce 2/3 pin sensor models: WB201, A201, A301, and A401

WELF 2 System

System Performance

WELF2 System Sampling Rate Range Max. # of Handles Includes
Single Handle Up to 200 Hz 65 Meters 1 (1) Handle-WiFi transmitter, (3) WB201 sensors, Windows-compatible ELF software
Single Handle High Speed Up to 6,000 Hz 65 Meters 1 (1) Handle-WiFi transmitter, (3) WB201 sensors, Windows-compatible ELF high speed software
*Multi Handle Up to 200 Hz 50 Meters 16 (1) Handle-WiFi transmitter, (3) WB201 sensors, Windows-compatible ELF software
*Multi Handle High Speed Up to 6,000 Hz 25 Meters 8 (1) Handle-WiFi transmitter, (3) WB201 sensors, Windows-compatible ELF high speed software

*An unsecured router is required for multi-handle use. Additional handles (WiFi transmitters) available for purchase.

Physical Properties of the Wireless Transmitter (Handle)

Length: 3.75" (95.3 mm)
Width: 1.83" (46.4 mm)
Height: 1.05" (26.7 mm)
Weight: 3.3 oz (95 g)


WELF 2 Sensors (Model WB201)

The Wireless ELF 2 system comes complete with three WB201 FlexiForce sensors (one in each of the three available force ranges):
WB201-L: Low (0-25 lb; 111 N)
WB201-M: Medium (0-150 lb; 667 N)
WB201-H: High (0-1000 lb; 4450 N)

The sensors are terminated with a male square pin to easily connect to the Wireless Transmitter.

Physical Properties

Thickness: 0.008" (0.203 mm)
Length: 7.75" (197 mm) End-to-end
Width: 0.55" (14 mm)
Active sensing area: 0.375" (9.53 mm) Diameter
Connector: Custom interface to ELF Data Acquisition System

Recommended Maximum Force

Sensor Max. Force (High Gain) Max. Force (Low Gain)
WB201 - L 0-1 lb (4.4 N) 0-25 lb (111 N)
WB201 - M 0-25 lb (111 N) 0-150 lb (667 N)
WB201 - H 0-150 lb (667 N) 1-1000 lb (4448 N)

Adjustable gain feature of the Wireless ELF 2 System allows you to set force ranges.

Typical Sensor Performance

Linearity (Error): < ±3% (Line drawn from 0 to 50% load)
Repeatability: < ±2.5% of Full Scale (Conditioned Sensor, 80% of Full Force Applied)
Hysteresis: < 4.5% of Full Scale (Conditioned Sensor, 80% of Full Force Applied)
Drift: < 5% /logarithmic time (Constant Load of 90% sensor rating)
Response Time: < 5 μsec (Time required for the sensor to respond to an input force; Impact load - recorded on Oscilloscope)
Operating Temperature: 15°F - 140°F (-9°C - 60°C)*

* Force reading change per degree of temperature change = ±0.2%/°F (0.36%/°C)
For loads less than 10 lb, the operating temperature can be increased to 165°F (74°C)

WELF 2 Software

Standard Software Features

  • Adjustable gain (lets you fine-tune the desired force range)
  • Real-time graphic displays in strip chart, column graph, or digital readout
  • Data retrieval and playback
  • Simple and storable calibration files
  • Internal triggering
  • User-selected recording speeds from 10 Hz up to 200 Hz
  • ASCII Output to data analysis software
  • Compatible with Windows 7, 8, XP, and Vista
  • Capability to tare a load

Optional Software Features

  • High Speed Software
  • Multi Handle Software
  • Multi Handle High Speed Software