Xforce Load Cells

Patented Xforce load cells—exclusively from ZwickRoell

Xforce load cells are ideal for tensile tests, compression tests, and flexure tests as well as for cyclic tests with zero crossing. The highly accurate patented Xforce load cells are used for all our load frame series. We make no compromises when it comes to quality.

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Advantages and features
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Accuracy to ISO 7500-1
Mounting studs
Design and construction
Technical overview
Force-measuring system
Relevant Products

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10.07.2019

Reliable calibration of load cells for crash test dummies

Significant Advantages and Features

Advantages and features

Xforce load cells are based on a rotation-symmetrical or axis-symmetrical design principle, making them highly resistant to transverse forces.
All Xforce load cells are highly insensitive to parasitic influences such as transverse forces, bending moments, torque, and temperature variations.
Xforce load cells are very robust and can withstand loads up to 300% of nominal capacity without mechanical failure and up to 150% without zero-point shift.
These intelligent load cells have a unique electronic identification system stored on an internal EEPROM.
Xforce load cells fulfill all five criteria of the ISO 7500-1 accuracy classes over a very large measurement range.

The heart of the testing system

Xforce load cells—the heart of the testing system

High-quality load cells are essential for achieving reliable, interpretable test results. To ensure that this core element is optimally integrated in the testing system, ZwickRoell has developed its own series of load cells: Xforce P (Precision), Xforce HP (High Precision), and Xforce K

The highly accurate Xforce P load cells are intended for use in tests which do not involve high transverse forces. This includes many tensile tests (though not on shear specimens, for example) as well as compression, flexure, and component tests in which no high transverse forces, bending moments, or torsional moments occur.
Xforce HP and Xforce K differ from Xforce P load cells primarily in their larger measurement range and greater resistance to parasitic influences, such as bending moments, torsional moments, and temperature variations. They are ideally suited to all static tensile, compression and flexure tests and are equally suitable for pulsating or cyclic tests with zero crossing.
Before dispatch, each load cell is calibrated with the testing machine plus drive and the measurement and control electronics as a complete system. This is recorded in the supplied factory calibration certificate.

All components from a single source: ZwickRoell develops and produces all system components in-house: testXpert III testing software, testControl measurement and control electronics, Xforce load cells, and all mechanical components.

Tips

Tips for optimal test results

Connections between the load cell and the components attached to the system, together with the test fixtures, should be as rigid and free of play as possible. This is because load cells frequently have to measure forces which change rapidly.
The smaller the test arrangement and therefore the lower the height, the fewer lever-arm effects will arise. Adapter units and extensions in particular generate undesirable lever-arm effects.
Lever arms and eccentricities should be avoided as far as possible in order to minimize bending moments. The further away from the test axis the force application point is, the greater is the influence of the bending moments.
Test fixtures/specimen grips and specimen must be aligned exactly to the test axis to enable controlled force application and distribution in the specimen to allow reliable, informative test results to be obtained.
Alternatively, swiveling or spherical connections can be used to allow test fixtures to self-align and adapt to the specimen.
If several load cells are in use, or in the event of frequent load cell changes, we recommend use of the Connect 2nd Load Cell option.
Alignment to the test axis is better via the plug-in system than via the usual threaded mounting, while reference positions for different test arrangements are also re-attained automatically. With the threaded fastening the reference positions change according to the number of turns. In addition, installation and removal are considerably easier with the plug-in system, while unnecessary strain on the load-cell cables is avoided.
Protect the load cell against overload by adjusting the force thresholds in line with the test sequence. The testing system switches off automatically if these force thresholds are reached.
They can be set either directly on the testing system as hardware limit switches or in the testing software as software limit switches. In the case of tests in which set force-thresholds are not sufficient to exclude the risk of damage to the load cell, we recommend overload protection.
The ambient temperature must be kept broadly constant during the test to avoid the measurement signal being influenced by temperature fluctuations.

System configuration_load cell_testXpert III

Self-identifying sensor plug

These intelligent load cells have a unique electronic identification system stored on an internal EEPROM.
The testXpert III testing software automatically identifies the sensor type and properties.
Force and travel limits are automatically imported.
Sensor overloads plus date are stored in the EEPROM.

Xforce Load Cells at a Glance

3:14

Patented Xforce load cells – exclusively from ZwickRoell

Xforce load cells are ideal for tensile tests, compression tests, and flexure tests as well as for cyclic tests with zero crossing.

Calibration and Accuracy to ISO 7500-1

ISO 7500 metallic materials—Verification of static uniaxial testing machines consists of two parts:

ISO 7500-1: Tension/compression testing machines—Verification and calibration of the force-measuring system
ISO 7500-2: Tension creep testing machines—Verification of the applied force

ISO 7500-1 contains general information on requirements for and on the verification and calibration of tensile, compression and flexure testing machines; spring testing machines and fatigue testing machines.

Accuracy to ISO 7500-1

All data apply to measured values in compression and tension directions.
All load cells are calibrated up to the relevant nominal force F_nom and satisfy the requirements of the following standards: EN ISO 7500 -1, EN ISO 7500 -2, ASTM E4.
Xforce load cells satisfy the calibration requirements and all five criteria of the ISO 7500-1 accuracy classes over a very large measurement range.

System calibration and large measurement range

System calibration

Before dispatch each load cell is calibrated with the testing system plus drive and the measurement and control electronics as a complete system. This is recorded in the accompanying factory calibration certificate.

Large measurement range

The large measurement range frequently eliminates the need to purchase a second load cell, saving the costs of acquisition and annual calibration.
Even with high pre-loads due to heavy test fixtures or specimen grips, virtually the entire load-cell measurement-range remains available. The load cell can still be used to full nominal capacity with fixture weights amounting to 45 % of nominal force.

Outstanding linearity

Xforce HP and Xforce K load cells feature very high accuracy.
Used in conjunction with testControl II electronics, Xforce HP and Xforce K (from 200 N) load cells typically offer significantly better linearity (= relative display deviation) than required by ISO 7500.
The maximum display deviation is less than 1% of the measured value from as low as 0.1% of the load cell nominal capacity; from 0.4% of nominal capacity it is 0.25% of the measured value.

Overload protection, force limits and operating force

Xforce load cells are very robust and can withstand loads up to 300% of nominal capacity without mechanical failure and up to 150% without zero-point shift. This means that overload protection such as pre-loaded springs, mechanical stops or guiders to absorb transverse forces is generally unnecessary.
The crosshead travel range can be restricted via software and hardware limit stops, protecting load cells and text fixtures.
Force limits can be set in testXpert III to switch off the testing system automatically, protecting the load cell.

Mounting Studs—Fast and Easy Connections

Xforce load cell connection of second load cell

Fast Load-Cell Change

If several load cells are to be used, or in the event of frequent load cell changes, we recommend the 'Connection via Mounting Stud' option.
Saves time and increases flexibility.
Avoids unnecessary strain on the load cell cable during screwing in and unscrewing.
The plug-in system delivers better alignment to the test axis than the usual threaded mounting.
Reference positions for different test arrangements are automatically re-attained (with a threaded mounting, reference positions change according to the number of turns screwed in).

Xforce load cell with second mounting stud

Simple mechanical plug-in system, including for two test areas

Xforce Load Cell Design and Construction

All Xforce load cells are based on a rotation-symmetrical or axis-symmetrical design principle, making them highly resistant to transverse forces.
The low overall height enables shorter test arrangements, which means shorter lever arms.
The design results in high operating forces, very small measurement travel, and high stiffness.
A high-quality shielded measurement cable with sensor plug provides the connection to the measurement amplifier for the measuring equipment.

Multi-bending beam

Bending ring

Xforce K, F_nom 10 to 250 kN
Xforce K+, F_nom 10 to 250 kN

In this version the spring element is a bending ring with a spiral strain-gage applied to its entire surface top and bottom.

The bending ring is connected to the hub and outer ring via circumferential elastic joints. When forces are transmitted to the load cell the bending ring deforms and its upper circumference increases whilst the lower circumference decreases, or vice versa. This deformation is recorded by spiral strain gages developed specifically for this load cell.

As the strain gages act uniformly over the entire surface of the bending ring, the load cell has no preferred direction.

Double bending beam

Technical overview

P - Precision
HP - High Precision
K - Load Cell

Xforce P, Fmax 5 N - 100 N

Xforce P (5 - 100 N)

Load cell	5	10	20	50	100	N
Item No.	057091	060253	060256	060257	060258
Item No. for ProLine	063919^[1]	063920^[1]	063921^[1]	063922^[1]	063923^[1]
Nominal force F_nom	5	10	20	50	100	N
Measurement range/measurement travel
Accuracy Class 1 (from 0.4 % of F_nom)	0.02^[2]	0.04^[2]	0.08	0.2	0.4	N
Accuracy Class 0.5 (from 2 % of F_nom)	0.1	0.2	0.4	1.0	2.0	N
Dimensions/weight
Installation height, approx.	55	55	55	55	55	mm
Connection
Mounting stud, Ø	8	8	8	8	8	mm
Connection thread	M28x1.5	M28x1.5	M28x1.5	M28x1.5	M28x1.5
Influences/limit values
Limit bending moment	0.7^[3]	1.0^[3]	1.3^[3]	2.0^[3]	3.0^[3]	Nm
Limit torque	10.0^[4]	10.0^[4]	10.0^[4]	10.0^[4]	10.0^[4]	Nm

Only in combination with a ProLine load frame. Please see note.

To enable calibration and use of the extended measurement range for 5 N and 10 N Xforces, the appropriate environmental and operating conditions must be present; this basically involves an installation site which is free from shocks and vibrations. More specific details can be found in the user manual and the installation instructions.

Maximum bending moments Mb for a load cell which is unloaded in the direction of measurement. In the case of simultaneous loading at nominal load, the values must be halved.

Unloaded. In the case of simultaneous loading at nominal load, these values must be halved.

Xforce P, Fmax 200 N - 1 kN

Xforce P (0.2 - 1 kN)

Load cell	0.2	0.5	0.5	1	kN
Item No.	011563	011562	057993	011560
Item No. for ProLine	018542^[1]	018540^[1]	058423^[1]	018539^[1]
Nominal force F_nom	0.2	0.5	0.5	1	kN
Measurement range/measurement travel
Accuracy Class 1 (from 0.4 % of F_nom)	0.8	2.0	2.0	4.0	N
Accuracy Class 0.5 (from 2 % of F_nom)	4.0	10.0	10.0	20.0	N
Dimensions/weight
Installation height, approx.	55	55	61	61	mm
Connection
Connection thread	M28x1.5	M28x1.5	M28x1.5	M28x1.5
Mounting stud, Ø	8	8	20	20^[2]	mm
Influences/limit values
Limit bending moment	2 (3)^[3] ^[4]	5 (7)^[3] ^[4]	5 (7)^[3] ^[4]	15 (17)^[3] ^[4]	Nm
Limit torque	5 (14)^[5] ^[4]	7 (35)^[5] ^[4]	7 (35)^[5] ^[4]	17 (50)^[5] ^[4]	Nm

Only in combination with a ProLine load frame. Please see note.

With Xforce load cells the diameter of the mounting stud for a 1kN load cell has been changed from 8 mm to 20 mm!

Maximum bending moments Mb for a load cell which is unloaded in the direction of measurement. In the case of simultaneous loading at nominal load, the values must be halved.

The values refer to the limit torques of the connection system. If these values are exceeded, recalibration is required. The values relating to the limit torques of the measuring cell are shown in brackets.

Unloaded. In the case of simultaneous loading at nominal load, these values must be halved.

Xforce P, Fmax 2.5 kN - 10 kN

Xforce P (2.5 - 20 kN)

Load cell	2.5	5	10	10	20	kN
Item No.	011558	011556	017955	011554	017907
Item No. for ProLine	018538^[1]	018537^[1]	-	018536^[1]	019242^[1]
Nominal force F_nom	2.5	5	10	10	20	kN
Measurement range/measurement travel
Accuracy Class 1 (from 0.4 % of F_nom)	10	20	40	40	80	N
Accuracy Class 0.5 (from 2 % of F_nom)	50	100	200	200	400	N
Dimensions/weight
Installation height, approx.	61	61	54	70	66	mm
Connection
Connection thread	M28x1.5	M28x1.5	-	M28x1.5	-
Mounting stud, Ø	20	20	20	20	36	mm
Connection flange	-	-	Flange 1^[2]	-	Flange 1^[2]
Influences/limit values
Limit bending moment	30 (34)^[3] ^[4]	50 (58)^[3] ^[4]	80 (115)^[3] ^[4]	80 (115)^[3] ^[4]	250 (460)^[3] ^[4]	Nm
Limit torque	17 (80)^[5] ^[4]	17 (130)^[5] ^[4]	17 (200)^[5] ^[4]	17 (200)^[5] ^[4]	250 (1500)^[5] ^[4]	Nm

Only in combination with a ProLine load frame. Please see note.

Flange 1 = bolt circle 115 mm, Flange 2 = bolt circle 220 mm.

Maximum bending moments Mb for a load cell which is unloaded in the direction of measurement. In the case of simultaneous loading at nominal load, the values must be halved.

The values refer to the limit torques of the connection system. If these values are exceeded, recalibration is required. The values relating to the limit torques of the measuring cell are shown in brackets.

Unloaded. In the case of simultaneous loading at nominal load, these values must be halved.

Xforce P, Fmax 20 kN - 250 kN

Xforce P (30 - 250 kN)

Load cell	30	50	100	150	250	kN
Item No.	017908	017909	017910	017911	017912
Item No. for ProLine	019246^[1]	019248^[1]	019254^[1]	-	-
Nominal force F_nom	30	50	100	150	250	kN
Measurement range/measured displacement
Accuracy Class 1 (from 0.4 % of F_nom)	120	200	400	600	1000	N
Accuracy Class 0.5 (from 2 % of F_nom)	600	1000	2000	3000	5000	N
Dimensions/weight
Installation height, approx.	66	66	104	104	104	mm
Connection
Mounting stud, Ø	36	36	60	60	60	mm
Connection flange	Flange 1^[2]	Flange 1^[2]	Flange 2^[2]	Flange 2^[2]	Flange 2^[2]
Influences/limit values
Limit bending moment	250 (500)^[3] ^[4]	250 (650)^[3] ^[4]	3500 (4500)^[3] ^[4]	4000 (5000)^[3] ^[4]	5000 (6000)^[3] ^[4]	Nm
Limit torque	250 (1800)^[5] ^[4]	250 (3000)^[5] ^[4]	6500 (10000)^[5] ^[4]	5800 (12500)^[5] ^[4]	11000 (15000)^[5] ^[4]	Nm

Only in combination with a ProLine load frame. Please see note.

Flange 1 = bolt circle 115 mm, Flange 2 = bolt circle 220 mm.

Maximum bending moments Mb for a load cell which is unloaded in the direction of measurement. In the case of simultaneous loading at nominal load, the values must be halved.

The values refer to the limit torques of the connection system. If these values are exceeded, recalibration is required. The values relating to the limit torques of the measuring cell are shown in brackets.

Unloaded. In the case of simultaneous loading at nominal load, these values must be halved.

Xforce HP, Fmax 5 N - 100 N

Xforce HP (5 - 100 N)

Load cell	5	10	20	50	100	N
Item No.	063924	063925	063926	060259	060260
Item No. for ProLine	063927^[1]	063929^[1]	063930^[1]	063932^[1]	063933^[1]
Nominal force F_nom	5	10	20	50	100	N
Measurement range/measurement travel
Accuracy Class 1 (from 0.2 % of F_nom)	-	0.02^[2]	0.04	0.1	0.2	N
Accuracy Class 1 (from 0.4 % of F_nom)	0.02^[2]	-	-	-	-	N
Accuracy Class 0.5 (from 1 % of F_nom)	0.05	0.1	0.2	0.5	1.0	N
Dimensions/weight
Installation height, approx.	55	55	55	55	55	mm
Connection
Connection thread	M28x1.5	M28x1.5	M28x1.5	M28x1.5	M28x1.5
Mounting stud, Ø	8	8	8	8	8	mm
Influences/limit values
Limit bending moment	6.0^[3]	6.0^[3]	6.0^[3]	6.0^[3]	6.0^[3]	Nm
Limit torque	10.0^[4]	10.0^[4]	10.0^[4]	10.0^[4]	10.0^[4]	Nm

Only in combination with a ProLine load frame. Please see note.

To enable calibration and use of the extended measurement range for 5 N and 10 N Xforces, the appropriate environmental and operating conditions must be present; this basically involves an installation site which is free from shocks and vibrations. More detailed information can be found in the Operating Manual and the Installation Conditions.

Maximum bending moments Mb for a load cell which is unloaded in the direction of measurement. In the case of simultaneous loading at nominal load, the values must be halved.

Unloaded. In the case of simultaneous loading at nominal load, these values must be halved.

Xforce HP, Fmax 200 N - 1 kN

Xforce HP (0.2 - 1 kN)

Load cell	0.2	0.2	0.5	0.5	1	kN
Item No.	011571	052697	011570	057991	011569
Item No. for ProLine	018548^[1]	-	018547^[1]	058424^[1]	018546^[1]
Nominal force F_nom	0.2	0.2	0.5	0.5	1	kN
Measurement range/measurement travel
Accuracy Class 1 (from 0.2 % of F_nom)	0.4	0.4	1.0	1.0	2.0	N
Accuracy Class 0.5 (from 1 % of F_nom)	2.0	2.0	5.0	5.0	10.0	N
Dimensions/weight
Installation height, approx.	55.3	66	55.3	61	61	mm
Connection
Connection thread	M28x1.5	M28x1.5	M28x1.5	M28x1.5	M28x1.5
Mounting stud, Ø	8	20	8	20	20^[2]	mm
Influences/limit values
Limit bending moment	2 (3)^[3] ^[4]	2.0^[3]	5 (7)^[3] ^[4]	5 (7)^[3] ^[4]	15 (17)^[3] ^[4]	Nm
Limit torque	5 (14)^[5] ^[4]	5.0^[5]	7 (35)^[5] ^[4]	7 (35)^[5] ^[4]	17 (50)^[5] ^[4]	Nm

Only in combination with a ProLine load frame. Observe the relevant notes.

With Xforce load cells the diameter of the mounting stud for a 1kN load cell has been changed from 8 mm to 20 mm!

Maximum bending moments Mb for a load cell which is unloaded in the direction of measurement. In the case of simultaneous loading at nominal load, the values must be halved.

The values refer to the limit torques of the connection system. If these values are exceeded, recalibration is required. The values relating to the limit torques of the measuring cell are shown in brackets.

Unloaded. In the case of simultaneous loading at nominal load, these values must be halved.

Xforce HP, Fmax 2.5 kN - 10 kN

Xforce HP (2.5 - 10 kN)

Load cell	2.5	5	10	10	kN
Item No.	011568	011566	017953	011565
Item No. for ProLine	018545^[1]	018544^[1]	018554^[1]	018543^[1]
Nominal force F_nom	2.5	5	10	10	kN
Measurement range/measurement travel
Accuracy Class 1 (from 0.2 % of F_nom)	5.0	10.0	20.0	20.0	N
Accuracy Class 0.5 (from 1 % of F_nom)	25.0	50.0	100.0	100.0	N
Dimensions/weight
Installation height, approx.	61	61	54	70	mm
Connection
Connection thread	M28x1.5	M28x1.5	-	M28x1.5
Mounting stud, Ø	20	20	20	20	mm
Connection flange	-	-	Flange 1^[2]	-
Influences/limit values
Limit bending moment	30 (34)^[3] ^[4]	50 (58)^[3] ^[4]	80 (115)^[3] ^[4]	80 (115)^[3] ^[4]	Nm
Limit torque	17 (80)^[5] ^[4]	17 (130)^[5]	17 (200)^[5] ^[4]	17 (200)^[5] ^[4]	Nm

Only in combination with a ProLine load frame. Please see note.

Flange 1 = bolt circle 115 mm, Flange 2 = bolt circle 220 mm.

Maximum bending moments Mb for a load cell which is unloaded in the direction of measurement. In the case of simultaneous loading at nominal load, the values must be halved.

The values refer to the limit torques of the connection system. If these values are exceeded, recalibration is required. The values relating to the limit torques of the measuring cell are shown in brackets.

Unloaded. In the case of simultaneous loading at nominal load, these values must be halved.

Xforce K, Fmax 10 kN - 50 kN

Xforce K (10 - 50 kN)

Load cell	10	10	20	30	50	kN
Item No.	1008815	1008732	318936	325642	318934
Item No. for ProLine	-	1008733^[1]	325222^[1]	325644^[1]	325223^[1]
Nominal force F_nom	10	10	20	30	50	kN
Measurement range/measurement travel
Accuracy Class 1 (from 0.2 % of F_nom)	20	20	40	60	100	N
Accuracy Class 0.5 (from 1 % of F_nom)	100	100	200	300	500	N
Dimensions/weight
Installation height, approx.	74	90	75.5	75.5	75	mm
Connection
Connection thread	-	M28x1.5	-	-	-
Mounting stud, Ø	20	20	36	36	36	mm
Connection flange	Flange 1^[2]	-	Flange 1^[2]	Flange 1^[2]	Flange 1^[2]
Influences/limit values
Limit bending moment	500^[3]	500^[3]	600^[3]	700^[3]	1100^[3]	Nm
Limit torque	500^[4]	500^[4]	500^[4]	500^[4]	1800^[4]	Nm

Only in combination with a ProLine load frame. Please see note.

Flange 1 = bolt circle 115 mm, Flange 2 = bolt circle 220 mm.

Maximum bending moments Mb for a load cell which is unloaded in the direction of measurement. In the case of simultaneous loading at nominal load, the values must be halved.

Unloaded. In the case of simultaneous loading at nominal load, these values must be halved.

Xforce K, 100 kN - 250 kN

Xforce K (100 - 250 kN)

Load cell	100	100	150	250	250	kN
Item No.	318932	068922^[1]	320304	318930	068918^[2]
Item No. for ProLine	325328^[3]	-	-	-	-
Nominal force F_nom	100	100	150	250	250	kN
Measurement range/measurement travel
Accuracy Class 1 (from 0.2 % of F_nom)	200	-	300	500	500	N
Accuracy Class 0.5 (from 1 % of F_nom)	1000	-	1500	2500	2500	N
Accuracy Class 1 (from 0.4 % of F_nom)	-	400	-	-	-	N
Accuracy Class 0.5 (from 2 % of F_nom)	-	2000	-	-	-	N
Dimensions/weight
Installation height, approx.	106	131	106	162	131	mm
Connection
Mounting stud, Ø	60	Flange	60	60	Flange	mm
Connection flange	Flange 2^[4]	Flange 2^[4]	Flange 2^[4]	Flange 2^[4]	Flange 2^[4]
Influences/limit values
Limit bending moment	4800^[5]	30000^[5]	8000^[5]	30000^[5]	30000^[5]	Nm
Limit torque	10000^[6]	55000^[6]	^[6]20000	55000^[6]	55000^[6]	Nm

Flange interface with 70mm centering spigot instead of mounting stud, for use in combination with alignment unit (Item No. 068902) and Type 8594 hydraulic grips ("Body over Wedge") (Item Nos 072865 and 072869). Design and technical details as per Item No. 068918

Flange interface with centering-spigot instead of mounting stud (bolt circle 115/220 mm, centering spigot D30/70 mm).

Only in combination with a ProLine load frame. Please see note.

Flange 1 = bolt circle 115 mm, Flange 2 = bolt circle 220 mm.

Maximum bending moments Mb for a load cell without a load in the measurement direction. In the case of simultaneous loading at nominal load, the values must be halved.

Unloaded. In the case of simultaneous loading at nominal load, these values must be halved.

Daily Check

Device for checking load cells up to 500 N.

Application

This device is used for regular checks on load cells up to 500 N by means of comparison values which have been measured following recalibration / adjustment. The device consists of two reference standards (master/slave).

Routine checking is carried out with the slave device. A check is only made with the master device if deviations from the specified tolerance range are identified.

Advantages and features

Devices plus software can be used on as many machines as required.
Detection of a systematic errors in compression and tension in the load cell (symmetrical structure of the Xforce load cell).
Easy installation and removal.
Reliable test results: performing checks between periodic calibrations ensures that the load cell is free of systematic errors.
The results of the daily check are recorded in a testXpert report.
Traceability: all safety-critical tests place particular demands on traceability and documentation. ZwickRoell testing software allows the administrator to specify what is logged and for which procedures and events reasons or explanations must be entered.

Technical data

Type	Device for checking load cells up to 500 N
Item No.	3001493
Test load (F_max)	50	N
Comparison accuracy
2-20 N	± 0.2	N
20-50 N	± 1	%
Test travel	2 to 50	mm
Dimensions
Length	260	mm
top compression mandrel	Ø 12	mm
Lower connection	Ø 20	mm
Installation height	243	mm
Ambient temperature	+10 to +35	°C
Weight per item, approx.	1.4	kg
Scope of delivery	2	piece(s)

Xforce Force-measuring System with Load Bypass Unit

During tests in the compression direction, Xforce HP load cells are safeguarded by mechanical overload protection and an integrated load bypass unit.

Advantages and features

large support width gives the force measurement system high axial and flexural stiffness
overload protection provided by mechanical stop
clear, error-free compression-platen positioning (no alignment unit required)
large overtravel (longer than testing machine braking distance) ensures safety
low overall height achieved through compact design
patent-based Xforce load cells available exclusively from ZwickRoell
all Xforce load cells are highly insensitive to parasitic influences (transverse forces, bending moments, and torque)
Xforce load cells satisfy calibration requirements well beyond specifications in standards

Function description

During tests in the compression direction, Xforce HP load cells are safeguarded by mechanical overload protection and an integrated load bypass unit.
In the case of the mechanical overload protection a mechanical stop locks at or above the load-cell nominal force, preventing damage to the load cell due to overload.
The integrated load bypass unit protects the entire test arrangement.
From a defined load threshold (starting from the maximum capacity of the load cell) the existing load is transferred to several springs, allowing overtravel of the entire test assembly and thereby preventing an increase in force in the load cell which would result in overload or even destruction.

Technical data (AllroundLine & ProLine)

Xforce force-measurement system with load bypass unit for AllroundLine/ProLine

Nominal force F_nom	2,5	5	10	kN
Item No.	029720	029724	027258
Accuracy Class 1 (from 0.2 % of F_nom)	5	10	20	N
Accuracy Class 0.5 (from 1 % of F_nom)	25	50	100	N
Dimensions
Diameter	234^[1]	234^[1]	234^[1]	mm
Installation height	106^[2]	106^[2]	106^[2]	mm
Approx. weight	16	16	16	kg
Load bypass unit from	2,5^[3]	5^[3]	10^[3]	kN
Load bypass coasting travel	4	4	4	mm

172mm diameter suitable for single-column testing machines; 234mm diameter suitable for two-column testing machines

With compression platen inserted. Installation height reduced by approx. 12 mm without compression platen.

Force measurement systems combining load bypass units and load cells with low nominal forces available on application.

Technical data (zwickiLine)

Xforce force-measurement system with load bypass unit for zwickiLine

Nominal force F_nom	0,5	1	2.5	kN
Item No.	083222^[1]	083223^[1]	092455^[1]
Accuracy Class 1 (from 0.2 % of F_nom)	1	2	5	N
Accuracy Class 0.5 (from 1 % of F_nom)	5	10	25	N
Dimensions
Diameter	172^[2]	172^[2]	172^[2]	mm
Installation height	96^[3]	96^[3]	93^[3]	mm
Approx. weight	7	7	7	kg
Load bypass unit from	0,5^[4]	1^[4]	2.5^[4]	kN
Load bypass coasting travel	4	4	4	mm

Also possible in conjunction with zwicki standard safety device

172mm diameter suitable for single-column testing machines; 234mm diameter suitable for two-column testing machines

With compression platen inserted. Installation height reduced by approx. 12 mm without compression platen.

Force measurement systems combining load bypass units and load cells with low nominal forces available on application.

Reliable calibration of load cells for crash test dummies

Globally increasing requirements for vehicle safety require continuously improved vehicle solutions for protecting passengers, which can only be developed and validated by reliable crash tests on dummies. ZwickRoell offers a modular system for the reliable calibration of load cells in crash test dummies.