FN4055
Low Ranges Seat Belt Load Cell
SPECIFICATIONSRanges from 100 to 300 N (20 to 60 lbf)

Compatible with most seat belts



Machined with integrated mechanical stops



Accuracy ±0.25%FS

TE CONNECTIVITY has applied our decade of experience
serving the automotive crash test industry to design theultimate crash test seat belt restraint sensor.
The FN4055 measures with excellent accuracy theforces exerted on the seat belt. Only the actual
compression upon the seat belt is measured, as the sensor
is insensitive to contact from the crash test dummy. The unit
is designed for very low range, like tests for kid’s security.
It is protected against overload by mechanical stops.

FEATURES

Protected against overload
Tension only
Usable without cutting the belt
For Static and Dynamic Applications

A similar sensor, EL20-S458, covers requests withhigher ranges up to 25kN.

APPLICATIONSWith many years of experience as a designer andmanufacturer of sensors, TE CONNECTIVITY often works
with customers to design or customize sensors for specificuses and testing environments.

Automotive crash test
Kid seats tests
Security belts controls
Laboratory and Research

On request, Instruction documents can be provided
to ease the selection and use of our sensors and provide
helpful tips.

SENSOR SOLUTIONS /// FN4055_en

07/2017

Page 1FN4055
Seat belt load cell

STANDARD RANGES
Ranges in N (FS)

100250300

Ranges in lbf (FS)205060Over range in N w/o damage

1000

2500

3000

Over range in lbf w/o damage

200500600

PERFORMANCE SPECIFICATIONS (typical values at temperature 23±3°C)
Parameters
Operating Temperature Range (OTR)-20 to 80° C [-4 to 176° F]

Compensated Temperature Range (CTR)

0 to 60º C [32 to 140° F]

Zero Shift in CTR<0.5% F.S. / 50° C [/100° F]

Sensitivity Shift in CTR<1.5% of reading / 50° C [/100° F]

Over-Range
Without Damage

See table

Accuracy
Combined Non-Linearity & Hysteresis±0.25% F.S.

Electrical Characteristics
Model

FN4055

Supply Outage

10Vdc

Sensitivity “FSO”

2 mV/V

Zero Offset<±1mV

Input Impedance/Consumption

350 Ω

Output Impedance

350 Ω

Insulation under 50Vdc≥100MΩ

Notes
1. Shielded cable with 4 wires, standard length 2 m [6.5 ft]
2. Material: Body aluminium alloy
3. Protection Index: IP50

SENSOR SOLUTIONS /// FN4055_en

07/2017

Page 2

FN4055
Seat belt load cell

DIMENSIONS

Wiring Schematic

SENSOR SOLUTIONS /// FN4055_en

07/2017

Page 3

FN4055
Seat belt load cell

OPTIONS AND ACCESSORIES
L00M: Special Cable Length, replace “00” with total length in meter (Specified only on units with N range.)

ORDERING INFORMATION

FN4055-100N-/L5M
Options (L00M, ..)Range in Newton
ModelTE.com/sensorsolutions
Measurement Specialties, Inc., a TE Connectivity company.
Measurement Specialties, TE Connectivity, TE Connectivity (logo) and EVERY CONNECTION COUNTS are trademarks. All other logos, products and/or company names referred to herein
might be trademarks of their respective owners.
The information given herein, including drawings, illustrations and schematics which are intended for illustration purposes only, is believed to be reliable. However, TE Connectivity makes
no warranties as to its accuracy or completeness and disclaims any liability in connection with its use. TE Connectivity‘s obligations shall only be as set forth in TE Connectivity‘s StandardTerms and Conditions of Sale for this product and in no case will TE Connectivity be liable for any incidental, indirect or consequential damages arising out of the sale, resale, use or misuseof the product. Users of TE Connectivity products should make their own evaluation to determine the suitability of each such product for the specific application.
© 2015

TE Connectivity Ltd. family of companies

SENSOR SOLUTIONS /// FN4055_en

All Rights Reserved.

07/2017

Page 4