Composite Test Fixtures

Reference test fixtures for testing composite materials

Reference test fixtures

Grasse Zur Composite Testing offers a wide range of test fixtures for the mechanical determination of characteristic values of fibre-reinforced plastics. The test fixtures are used in universal testing machines (e.g. Zwick, MTS, Instron,…) in accordance with the respective test standard for carrying out quasi-static and cyclic tests. By operating an accredited test laboratory according to DIN EN ISO 17025, Grasse Zur Composite Testing has the know-how in handling test fixtures in order to achieve best test results with optimised ergonomics. As a member of DIN, Grasse Zur Composite Testing actively designs new standards and revises existing test procedures. In addition, individual test devices are developed on customer order, such as the release agent test device in cooperation with BMW, with which special applications can be carried out.

Optimised use

The test fixtures are characterised by optimised clamping and alignment of the specimens as well as easier operation. For this reason, better material properties are achieved with increased reproducibility of the material properties. In addition, new test methods from research and industry, such as the determination of shear properties by use of a picture frame from BAM, are transferred to industrial practice and standardised in the relevant committees, e.g. as DIN SPEC 4885 or DIN EN ISO 20337.

GZ S-100 / S-100 HT

Push frame shear test system for quasi-static tests

The shear test system GZ S-100 or GZ S-100HT is an innovative test method for the determination of shear strength and shear stiffness of FRP based on a push frame. The thrust index determination by means of a push frame determines thrust characteristics, is standardized according to DIN EN ISO 20337 (formerly DIN SPEC 4885) and has the approval of the DNVGL for the certification of rotor blades for wind turbines (DNVGL ST-0376). 

The GZ S-100 / GZ S-100 HT shear test system enables a very precise determination of the shear characteristics of fiber-reinforced plastics (Shear strength, shear stiffness and maximum shear strain). The test method represents a significantly improved test method compared to

all other shear test methods (for example DIN EN ISO 14129, ASTM D7078 or ASTM D5379), since there is a pure state of shear stress in the test specimen. For this reason, significantly higher material characteristics are achieved with simultaneously lower standard deviations.

The square test piece is clamped hydraulically in the push frame. To determine the shear strain strain gauges are used, doublers are not necessary. Due to the split design, a simple and quick change of the test specimen within a few minutes is possible. The biggest advantage of the test procedure over other shear test methods is the non-existent restriction to max. Sliding elongations of 5%, which significantly higher shear strengths are achieved. The procedure was developed at the Federal Institute for Materials Research and Testing (Bundesanstalt für Materialforschung und -prüfung (BAM)and scientifically validated.

Features
Accessories
Standards
Information
  • Shear test system based on a push frame with a unique possibility for determining the interlaminar thrust properties in the sample plane (in-plane shear test)
  • Material testing with pure shear stress state
  • No free test specimen edges and no notch effect due to surface specimen clamping
  • Can be used for tests at elevated temperatures up to +150 ° C (GZ S-100 HT)
  • Testing of material failure and buckling behavior with test loads up to max. 100 kN
  • Hydraulic test specimen clamping with homogeneous clamping force distribution with max. 120 kN clamping force
  • Testing of isotropic and anisotropic materials with specimen thicknesses up to max. 10 mm
  • Can be used in all common universal testing machines
  • Operation with optional 700 bar hydraulic unit GZ HP-700 M
  • Clamping surfaces with cross milling, longitudinal milling, cross milling or diamond coating
  • Adapter for connection to all common electromechanical and servohydraulic universal testing machines
  • DIN SPEC 4885"Fiber Reinforced Plastics - Shear Test using Shear Frames to Determine the Shear Stress / Shear Deformation Curve and Shear Modulus at the Layer Level", DIN, 2014
  • DIN EN ISO 20337,"Fiber reinforced plastics - shear test by means of shear frame for determination of shear stress / shear strain curve and shear modulus in the layer plane", DIN, 2018

GZ RS-50 / RS-50 H

Rail shear thrust device for quasi-static tests

The Rail Shear thrust device GZ RS-50 and GZ RS-50 H for specimens with a V-shaped notch suitable for the quasi-static characterization of the thrust properties of fiber-reinforced plastics. The test device is used for testing on short, long and continuous fiber reinforced plastics with thermoplastic or thermoset base materials and is used for unidirectional layers or fabrics as well as multi-layer composites (sandwich laminates).

In terms of handling, lateral guides and tilting of the jaws prevent slipping during the test specimen change. Predefined markings allow precise adjustments for different test specimen thicknesses. The precise positioning of the specimen in the test device is done with a biaxial guide system.

With the hydraulic variant GZ RS-50 H the clamping of the test specimen takes place via a hydraulic clamping jaw system. During the test procedure, the hydraulic system regulates the clamping force. The specimen remains reliably clamped and prevents slipping even with decreasing thickness due to load transfer effects and shear distortion. In addition, the hydraulics ensure a uniformly distributed clamping force.

Features
Accessories
Standards
Information
  • Maximal test load up to 50 kN
  • Substantially simplified replacement compared to other devices
  • Significantly improved accuracy of alignment 
  • No jaw slipping due to lateral guidance
  • Significantly increased reproducibility due to biaxial guidance system
  • Interchangeable jaws (cross milling and diamond coating)
  • Optional hydraulically adjustable setting force for the jaws
  • Automatic specimen centering
  • Adapter for connection to all common electromechanical and servo-hydraulic universal testing machines
  • ASTM D 7078, "Standard Test Method for Shear Properties of Composite Materials by V-Notched Rail Shear Method“, ASTM, 2012

GZ IS-20

Iosipescu thruster for quasi-static testing

For the shear tests, an iosipescu thruster is used according to ASTM D5, which can be used in all common universal testing. This pusher is suitable for the static characterization of the thrust properties of fiber reinforced plastics. 

The iosipescu shear test is carried out by means of an asymmetrically loaded four-point bending test. The specimen is clamped in the iosipescu device and loaded via two relatively movable profiles. The loads are introduced into the sample via four areas. A V-shaped notch in the specimen determines the location of the failure. The material load in the specimen represents a shear force shear stress.

A major advantage of the iosipescu shear test over other methods such as the tensile test according to DIN EN ISO 14129, the rail shear thrust test according to ASTM D7078, and the shear frame thrust test according to DIN EN ISO 20337 is the simple test procedure. With this test method single- and multi-axially oriented laminates with any fiber orientation can be tested with little effort. Due to the small specimen geometry and the notch, lower thrust characteristics (shear stiffness and shear strength) are generally determined. 

Features
Accessories
Standards
Information
  • Compact and very high-quality testing device for test loads up to 20 kN
  • Precise alignment and centering of the specimen (alignment) through central adjustment gauge 
  • Test specimen geometry 76 mm x 19 mm x 2 to 10 mm
  • Stainless design of all components allows use in climatic chambers (-40 to +150° C)
  •  Connection to all common electrochemical and servo-hydraulic universal testing machines
  • Adapter for the upper intake of all common electrochemical and servo-hydraulic universal testing machines
  • Printing plate for lower intake of universal testing machines according to customer specification
  • ASTM D5379, “Standard Test Method for Shear Properties of Composite Materials by the V-Notched Beam Method”, ASTM, 2012

GZ C-20

Celanese printing device for quasi-static testing

The celanese printing device GZ C-20 is for quasi-static characterization of the printing properties of composites according to different standards. The test device is used for testing on short, long and continuous fiber-reinforced plastics with thermo plastic and duroplastic base materials and is used for unidirectional layers or fabrics. In addition, isotropic materials such as pure resin or adhesive resin materials can be tested with this test device. 

The printing device is required for the test of fiber-reinforced plastics to prevent buckling of the specimen. With a length of the specimen of 110 mm, the free test length is only 10 mm. In the middle of the specimen, strain gauges are applied on both sides to determine the compressive strain and buckling The test device consists of clamping wedges, which deflects the axial force of the testing machine in a transverse force for clamping the specimen according to the self-reinforcing plastic. 

Features
Accessories
Standards
Information
  • Stable printing device for static forces up to 20 kN
  • Test specimen geometry 110 mm x 10 mm x 4/2 mm
  • Replaceable clamping pads for different materials and fiber orientations
  • Simple cable entry for strain gauges 
  • Stainless design of all components allows use in climatic chambers (-40 to +150 °C)
  • Clamping surfaces with cross milling, longitudinal milling, cross milling or diamond coating
  • Angle compensation element
  • Pressure plates with adapter for connection to all common electromechanical and servohydraulic testing machines
  • DIN EN ISO 14126 , "Fiber reinforced plastics - Determination of printing properties in the laminate plane", DIN, 2000
  • DIN 65375 , "Aerospace; Fiber reinforced plastics; Testing of unidirectional laminates; Pressure test transverse to the fiber direction ", DIN, 1989
  • ASTM D3410 , "Standard Test Method for Compressive Properties of Polymer Matrix Composite Materials with Unsupported Gage Section by Shear Loading", ASTM, 2016
  • DIN EN 2850 , "Unidirectional Carbon Fiber Duroplast Composites - Compression Test Parallel to Fiber Direction", DIN, 2017

GZ IT-50

IITRI printing device for quasi-static testing

The IITRI printing device GZ IT-50 is for quasi-static characterization of the printing properties of composites. The tet device is used to test short, long and continuous fiber-reinforced plastics with thermoplastic or thermoset base materials and is used for unidirectional layers and/or fabrics as well as multi-layer composites (sandwich laminates). In addition, isotropic materials such as pure resin or adhesive resin materials can be investigated with this device. 

The printing device is required for testing fiber-reinforced plastics to prevent buckling of the specimen. Compared with the Celanese GZ C-20 printing device, the IITRI device can test both ASTM D3410 and DIN EN ISO 14126. This means that specimens with a length of 110-160 mm and a width of 6-25 mm can be tested. In the middle of the specimen, strain gauges are applied on both sides to determine the compressive stiffness, the elongation at break and the buckling. The test device consists of clamping wedges, which deflects the axial force of the testing machine in a transverse force for clamping the specimen according to the self-reinforcing principle.

Features
Accessories
Normen
Information
  • Stiff pressure device for static forces up to 50 kN
  • Test specimen geometry 110-160 mm x 6-25 mm x 4/2 mm
  • Construction allows a specimen change within the device, clamping wedges do not have to be removed to replace the specimen
  • Replaceable clamping pads for different materials and fiber orientations
  • Very high quality and durable construction for easy operation to achieve the smallest standard deviations
  • Stainless design of all components allows use in climatic chambers (-40 to + 150 ° C)
  • Clamping surfaces with cross milling, longitudinal milling, cross milling or diamond coating
  • Machine connections for connection to all common electromechanical and servohydraulic testing machines
  • Pressure plates with adapter for connection to all common electromechanical and servohydraulic testing machines
  • ASTM D3410 , "Standard Test Method for Compressive Properties of Polymer Matrix Composite Materials with Unsupported Gage Section by Shear Loading", ASTM, 2016
  • DIN EN ISO 14126 , "Fiber reinforced plastics - Determination of printing properties in the laminate plane", DIN, 2000
  • DIN 65375 , "Aerospace; Fiber reinforced plastics; Testing of unidirectional laminates; Pressure test transverse to the fiber direction ", DIN, 1989
  • DIN EN 2850 , "Unidirectional Carbon Fiber Duroplast Composites - Compression Test Parallel to Fiber Direction", DIN, 2017

GZ IL-10

ILSS bending device for quasi-static tests

This device is used to detect the apparent interlaminar shear strength (ILSS).The test device is used for testing according to various standards on short, long and continuous fiber reinforced plastics with thermoplastic or thermoset base materials and is used for unidirectional layers or fabrics. In addition, isotropic materials such as pure resin or adhesive resin materials can be tested with this test device.

The short bending test method is a modification of the 3-point bending test. The support distance is small in relation to the specimen thickness, whereby the specimen is subjected to shear stress. The test specimens specified in the respective standards differ in length, thickness and bearing distance. The specimen is a short bar made of a thermosetting or thermosetting matrix with a fiber reinforcement in the 0 ° or 0 ° / 90 ° direction. With apparent interlaminar shear strength, the standard refers to “the maximum shear stress in half the thickness of the specimen at the moment of the first failure”.

Features
Accessories
Standards
Information
  • Compact test device for test loads up to 10 kN
  • Test specimen geometry 20 mm x 10 mm x 2-3 mm
  • Interchangeable support inserts for easy and quick adaptation of the test device to the respective test standard
  • Exact centering of the specimen through lateral guides and adjustment gauge
  • Stainless design of all components allows use in climatic chambers (-40 to + 150 ° C)
  • Support inserts for different standards
  • Adapter for connection to all common electromechanical and servo hydraulic universal testing machines
  • Pressure plate for lower mounting in universal testing machine according to customer specification
  • Expansion set for performing 3-point and 4-point bending tests according to DIN EN ISO 14125, DIN EN ISO 178, ASTM D 7264, ASTM D790, DIN EN 2563, or the like.
  • DIN EN ISO 14130 , "Fiber reinforced plastics - Determination of apparent interlaminar shear strength according to the short - bar three - point method " DIN, 1997
  • DIN EN 2377 , "Aerospace; Glass fiber reinforced plastics; Test method for the determination of apparent interlaminar shear strength ", DIN, 1989
  • DIN EN 2563 , Aerospace series - Carbon fiber reinforced plastics - Unidirectional laminates; Determination of Apparent Interlaminar Shear Strength ", DIN, 1997
  • ASTM D2344 , "Standard Test Method for Short-Beam Strength of Polymer Matrix Composites Materials and Their Laminates", ASTM, 2016
  •  

GZ B-20

Bending device for quasi-static tests

The innovative bending device GZ B-20 allows the execution of all common bending tests on fiber-reinforced plastics with only a single test device. All necessary bearing distances are flexibly adjustable with this bending device. The specimen is clamped as a bending beam between two outer supports and loaded via an inner support (3-point bend) or two inner supports (4-point bend). For the bending test on fiber-reinforced plastics, the procedures according to DIN EN ISO 14125, DIN EN ISO 178 and ASTM D790 are usually used. 

The bending strength and the flexural modulus are determined using a bending load of the test specimens under defined test conditions. The test is carried out at a constant speed up to a predetermined deformation or until failure of the specimen. As a result, the bending stress, the flexural modulus and the elongation at break are determined.

Features
Accessories
Standards
Information
  • Compact test device for test loads up to 20 kN
  • Interchangeable support inserts for easy and quick adaptation of the test device to the respective test standard
  • Freely selectable support distances
  • Precise centering of the specimen through lateral guides and adjustment gauge
  • Stainless design of all components allows use in climatic chambers (-60 to + 150 ° C)
  • Common support radii (R = 2 mm, R = 3 mm, R = 5 mm) for different standards
  • Adapter for connection to electromechanical and servohydraulic testing machines
  • DIN EN ISO 14125 : 2011-05, "Fiber-reinforced plastics - Determination of bending properties", DIN, 2011
  • ASTM D 790 , "Standard Test Methods for Flexural Properties of Unreinforced and Reinforced Plastics and Electrical Insulating Materials", ASTM, 2015
  • DIN EN ISO 178 , "Plastics - Determination of bending properties", DIN, 2013
  • DIN EN 2562 , Aerospace series - Carbon fiber reinforced plastics - Unidirectional laminates; Bending test parallel to the fiber direction ", DIN, 1997
  • DIN EN 2746 , "Aerospace series - Glass fiber reinforced plastics - Bending test, three-point method", DIN, 1998
  • ASTM D 7264 , Standard Test Method for Flexural Properties of Polymer Matrix Composite Materials, ASTM, 2015
  • ASTM D 6272 , "Standard Test Method for Flexural Properties of Unreinforced and Reinforced Plastics and Electrical Insulating Materials by Four-Point Bending", ASTM, 2010

GZ BS-32

Buckling support for cyclic tests

To perform fatigue tests, a buckling support is used when pressure is applied. This buckling support is suitable for the cyclic characterization of the tensile, compression and thrust properties of fiber-reinforced plastics and can be used in all common servo hydraulic universal testing machines or electro pulsers. The test device is used for testing on short, long and continuous fiber reinforced plastics with thermoplastic or thermoset base materials and is used for unidirectional layers and/or fabrics as well as multi-layer composites (such as sandwich laminates). 

The fatigue test is carried out according to the RHV guideline of the Federal Aviation Office or similar standards. The specimen is clamped in the buckling support. The precise alignment of the specimen takes place outside the testing machine, a clamping prevents slipping during clamping in the testing machine. Due to the V-shaped slot in the buckling support, the cyclical tests can also be carried out for fiber orientations in the +/- 45 ° direction for the determination of shear coefficients, where a high energy dissipation occurs. 

With a fiber orientation of the specimen in a +/- 45 ° direction, the cyclic thrust properties are determined in single or multi-stage tests, with a fiber orientation of 0 °, 90 ° or 0/90 ° direction the corresponding cyclic tensile-pressure properties. 

Features
Accessories
Standards
Information
  • Universal buckling support for high quasi-static and cyclic loads up to 50 kN
  • Test specimen geometry 32 mm x 1 to 4 mm x 210 mm
  • Interchangeable clamping pads
  • Friction linings made of teflon or a friction-optimized carrier plate
  • Stainless design of all components for use in climatic chambers (-60 to + 150 ° C)
  • Infrared temperature sensor for frequency-optimized testing (assuming trimodal control of the universal testing machine)
  • Clamping surfaces with cross milling, longitudinal milling, cross milling or diamond coating
  • Clamping jaws for universal testing machine for a clamping width of 25 mm
  • Federal Aviation Agency's RHV Guideline 1991-01
    Guideline for Proving the Recognition of Resin-Fiber Composite Systems in the Field of Manufacture and Maintenance of Gliders and Motorgliders

GZ B-50

3- and 4-point bending device for cyclic tests

The interchangeable bending device is suitable for the static and cyclic characterization of the bending properties of fiber reinforced plastics. The test device is used for testing on short, long and continuous fiber reinforced plastics with thermoplastic or thermoset base materials and is used for unidirectional layers and / or fabrics as well as multi-layer composites (sandwich laminates).

The interchangeable bending device is suitable for 3-point and 4-point bending tests and can be used for both quasi-static and cyclic investigations.

Demo Image
Features
Accessories
Normen
Information
  • Stiff alternating bending device for high static and cyclic loads up to 50 kN
  • Construction allows easy switching between 3-point and 4-point bending
  • Rolling bearing of the cages with large-sized needle bearings for high load cycles with low maintenance
  • Vertical and horizontal center positioning of the test pieces for displacement prevention in cyclic operation
  • Determination of Wöhler lines at load ratios of R = -1 (alternating load) or other load conditions
  • Stainless design of all components for use in climatic chambers (-60 to + 150 ° C)
  • Feeding fin fixed with different radii
  • Support fins stored with different radii
  • Adapter for connection to all common electromechanical and servohydraulic testing machines
  • DIN EN ISO 14125: 1998-06 , "Fiber Reinforced Plastics - Determination of Bending Properties", DIN, 1998
  • DIN EN ISO 178: 2003-06 , "Plastics - Determination of bending properties", DIN, 2001
  • DIN EN 2562: 1997-05 , Aerospace series - Carbon fiber reinforced plastics - Unidirectional laminates; Bending test parallel to the fiber direction ", DIN, 1997
  • DIN EN 2746: 1998-10 , "Aerospace series - Glass fiber reinforced plastics - Bending test, three-point method ", DIN, 1998
  • ASTM D790-10 , "Standard Test Methods for Flexural Properties of Unreinforced and Reinforced Plastics and Electrical Insulating Materials", ASTM, 2010
  • ASTM D7264-07 , "Standard Test Method for Flexural Properties of Polymer Matrix Composites", ASTM, 2007
  • ASTM D7774-12 , "Standard Test Method for Flexural Fatigue Properties of Plastics", ASTM, 2017

GZ RA-20

Release agent test fixture

In the manufacturing process of components from fibre-reinforced plastics, the ability to be demoulded from the cavity has a decisive influence on the quality of the component. For demoulding, the inside of the mould is carefully prepared with release agents. In automated production, integrated release agents are used which are compounded into the thermoplastic or added to the thermoset system.

The GZ RA-20 test fixture was developed jointly with the automobile manufacturer BMW to determine the residual adhesive force of release agents. The test device is suitable for use in universal testing machines. The release agent / plastic mixture to be tested is applied between two heatable plane-parallel surfaces made of high-alloy tool steel. The temperature setting and dwell time depend on the process data of the user or can be determined or optimised within the scope of a test series. During the test, the surfaces move apart at a defined speed, whereby the residual adhesive force generated by the polymer is measured.

In addition to the characterisation of release agents, the test device is also suitable for the reproducible production of pucks, which are used for further thermoanalytical or optical investigations. In addition, ultrasonic sensors based on US-Plus®-Technology can be installed to monitor the curing process online.

Features
Accessories
Standards
Information
  • Test fixture for loads up to max. 20 kN
  • Specimen geometry D 50 mm x 1...2 mm
  • Quick change system of the stamps
  • Maximum temperature 180 °C
  • Computer controlled temperature controller
  • Use in universal testing machines
  • Adapter for upper and lower mounting in universal testing machine according to customer specification
  • Automated dosing unit to increase reproducibility
  • Software module for measuring shrinkage
  • Exchangeable stamps (D 20...50 mm)
  • Compatible with GZ US-Plus® for simultaneous observation and optimisation of the curing process
  • No standard available
    (the test is carried out according to BMW standard operating procedure or user-defined)

GZ P-10

Permeation test fixture

The permeation test fixture GZ P-10 is used to determine the permeability of water vapour. It is used together with a climatic chamber. In connection with fibre-reinforced plastics, the water vapour permeability gives an indication of the permeability of these materials. The test is particularly necessary when the material comes into contact with water.

Features
Accessories
Standards
Information
  • Precise test fixture made of CNC-turned aluminium
  • Sealing with O-ring
  • Holder for silica gel
  • Silica gel
  • Replacement seals
  • DIN 53122-1, „Testing of plastics and elastomer films, paper, board and other sheet materials - Determination of water vapour transmission - Part 1: Gravimetric method“, DIN, 2001

GZ SD-80

Split disk test fixture for wound tubes and tube sections

The split disk test fixture GZ SD-80 is used for quasi-static and cyclic testing according to ASTM D2290. The ring tensile strength of rings, tubes and tube sections made of plastics and fibre-reinforced plastics (wound tubes) is determined. The tests are performed on test specimens over the entire width or on test specimens with a reduced cross-section to reduce the marginal influence at a defined failure location.

The split disk test fixture GZ SD-80 is characterised by very high rigidity and easy handling. The fork heads, which can be adapted to all common universal testing machines, are first installed for testing. The hinged discs are then fastened to the clevises using bolts. During the test, the disks align themselves so that the ring-shaped specimen almost completely abuts the disks and a reproducible material failure occurs. If required, strain gauges can be applied to determine the ring tensile stiffness and elongation at break. The disks are available for ring diameters in the range 50…250 mm. The testing device is also designed for use in climatic chambers.

Features
Accessories
Standards
Information
  • Easy alignment and clamping of the test specimen
  • Optimised surfaces for reproducible material testing
  • Wide range of applications due to disks for ring diameters in the range 50 to 250 mm
  • Material stainless steel
  • Disks for ring diameters in the range 50...250 mm
  • Clevis joints for upper mounting in universal testing machine according to customer specification
  • ASTM D2290-19, „Standard Test Method for Apparent Hoop Tensile Strength of Plastic or Reinforced Plastic Pipe“, ASTM, 2019

GZ DMS-2/3

Strain Gauge Connection Kit

The strain gauge connection kit GZ DMS-2/3 is used together with universal testing machines. It is used to connect the strain gauge of the specimen to the testing machine. For this purpose, a Wheatstone bridge is required to record the small ohmic resistance changes that occur locally in the strain gauge when the specimen is strained. In the universal testing machine these resistance changes are converted into strains.

The strain gauge connection kit GZ DMS-2/3 is characterised by a very user-friendly design. It consists of two or three long-life connection terminals for connecting the strain gauges in 2-wire or 3-wire technology, which guarantee reliable contacting of the strain gauge conductors. The cable to the testing machine is connected to the strain gauge connection box via an Amphenol socket. For the Wheatstone bridge, high-quality and selected supplementary resistors are used. The strain gauge connection box is attached to the frame of the universal testing machine via magnetic feet.

Features
Accessories
Versions
Information
  • Universal connection kit for strain gauges for use with universal testing machines
  • Two or three terminals for connecting the strain gauges in 2-wire or 3-wire technology
  • Use of high-quality and selected resistors for the Wheatstone bridge
  • Fixing of the strain gauge connection box via magnetic feet
  • Connection cable for MTS testing machines, shielded, Amphenol connector
  • Connection cable according to customer specification, shielded, Amphenol connector
  • GZ DMS-2/120
    2-wire technology, resistance 120 Ohm
  • GZ DMS-2/350
    2-wire technology, resistance 350 Ohm
  • GZ DMS-3/120
    3-wire technology, resistance 120 Ohm
  • GZ DMS-3/350
    3-wire technology, resistance 350 Ohm

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