ZET 7110 Digital Strain Gauge Sensor

data interface CAN 2.0
static measurements
explosion-proof version *

POR (price on request)

Load sensors ZET 7110 in industrial explosion version are supplied upon special order for additional cost.

Specifications

of the ZET 7110 Digital Strain Gauges

Metrological Data
Measured value	deformation, strain, torque, force
Connected primary transducers (PT) electric voltage measuring range	-6 to +6 mV/V
Common-mode voltage range	0 to 4,5 V
Sensitivity threshold (minimum difference between sequentially measured values)	0.0001 mV/V
Absolute measurement error (of the upper range limit)	0.05 %
Relative measurement error (of the measured value)	0.05 %
Additional measurement error (due to temperature measurement)	0.05 %/10°C
Parameters diagnostics	feed control, data quality control, bridge or half-bridge integrity control, measuring unit calibration
Technical Specification
Type of connected gauges	force gauge, bridge or half-bridge strain gauges (strain resistors)
DC voltage fed to the PT	4.2 ± 0.2 V
Maximum current fed to the PT	25 ± 1.5 mA
Data refresh rate	1, 5, 10, 25, 125 Hz
Data interface	CAN 2.0
Transmission rate	100, 300, 1,000 kbps
Performance Specification
Dimensions	71×39×17 mm
Weight	30 gr
Power supply	9 to 24 V
Consumed power (w/o PT)	0.5 W
Reverse polarity protection	yes
Operational temperature range	-40 to +100°C
Electromagnetic Compatibility
IEC 61000-4-2, ESD	contact 4 kV, air 8 kV
IEC 61000-4-4, EFT	power 0.5 kV, signal 0.25 kV
IEC 61000-4-5, Surge	500 V

Calculation Method
The input data are converted to the resulting value either in a linear fashion with the slope determined as the transmission ratio, or in a piecewise linear fashion according to the calibration table
Synchronization
Interface converter synchronizes the digital sensors. This allows to observe the interaction in different points (locations of the digital sensors) of the facility and draw diagrams.
Hardware Versions
Standard: laboratory design in a plastic cover (green).
OEM: board covered with a sealing compound.
Heavy Duty*: depending on the task specifics, this may be a version in a heavy duty cover (black) or location of the standard-design unit in an air-tight cover (with a transparent lid).
Ex-proof*: in a heavy duty cover with the explosion protection system of 0ExiaIICT6 X type.
*The cost is calculated individually.

Advantages

of the ZET 7110 Digital Strain Gauges

No adjustment is needed

The characteristics are stored in the measuring unit memory

Measurement Results

Measurement results are transmitted in a digital form

PTS Power Supply

Primary transducers are powered by the measurement unit

Reliability

Stable characteristics and high reliability in operation

Purpose

of the ZET 7110 Digital Strain Gauges

The ZET 7110 module is intended for measuring the relative deformation using primary transducers based on tension gauges. These may be either assembled tension gauges (force gauges, torque gauges), or detachable tension gauges connected using half-bridge or bridge mode.

Gauge runs on DC voltage, so ZET 7110 is used for static measurements.

The sensors are fixed on the object of measurement while the interface units ensuring information transmission are mounted in an air-tight box.

An advantage of the ZETSENSOR units is easy installation and uninstallation as well as indication of feed and signal transmission which, in its turn, facilitates diagnostics of the system at the facility.

Note

The ZET 7111 gauge is intended for dynamic measurements which inputs AC to the bridge circuit.

Application Scope

of the ZET 7110 Digital Strain Gauges

Mechanical testing of materials
Deformation studies
studying deformation distribution in parts of machines, structures, and constructions

Measurement of mechanical deformations
Stress determination
in the depth of operated or tested concrete and reinforced concrete structures (foundation slabs, columns, beams, and ceiling slabs), in weighing equipment of various purposes

Directive 2011/65/EU (ROHS, ROHS II)

DIGITAL STRAIN GAUGE SENSORS MEET THE REQUIREMENTS OF DIRECTIVE 2011/65/EU (ROHS, ROHS II) CONCERNING LIMITATION TO USE HAZARD SUBSTANCES (PB, HG, CD, CR(VI)) IN ELECTRICAL AND ELECTRONIC EQUIPMENT; THEY ARE MANUFACTURED USING LEAD-FREE METHOD, IN COMPLIANCE WITH THE EUROPEAN COMMUNITY REQUIREMENTS

Operation Principles

of the ZET 7110 Digital Strain Gauges

The digital strain gauge station consists of a tension gauge (tension bridge) and the ZET 7110 measuring unit which converts the signal from the gauge to the values of force, tension, pressure, etc. The resulting values are transmitted via CAN 2.0 interface.

Rules for Using in Explosion-Hazard Areas

for the ZET 7110 Digital Strain Gauges

When using digital gauges in explosion-hazard areas, one should observe the applicable national requirements.

Installation in explosion-hazard areas is allowed for heavy duty design (metal cover) digital gauges intended for use in explosion-hazard areas and bearing the relevant marking on their bodies: 0ExiaIICT6 X.

For the communication via data transmission channels and electric circuits the circuits of digital gauges installed in explosion-hazard areas shall be connected to interface converters and power supply sources through intrinsic safety barriers located in explosion-safe areas. A typical connection diagram for digital gauges installed in explosion-hazard zones is provided on the figure, and the recommended types of intrinsic safe barriers, in the table below.

Note

The typical diagram on the figure below shows names of circuits for RS-485 interface; when designing CAN interface connection diagrams, the names of the circuits shall be replaced as follows: “DATA-” to “H” and “DATA+” to “L”.

Connection Diagrams

of the ZET 7110 Digital Strain Gauges

The use of load sensors is very convenient when building distributed measurement networks. As opposed to conventional centralized measurement circuits, connection of “star” type is not required, which allows for decreasing the overall length of circuits. Since the data are transmitted in a digital form, the requirements for data transmission channel can be lowered and less expensive cable can be used for network building.

When building a measurement network, ZET 7110 gauges are connected in series; the resulting measurement chain is then connected to a computer using an interface converter: ZET 7174 (CAN ↔ USB), ZET 7176 (CAN ↔ Ethernet or Wi-Fi), ZET 7177 (CAN ↔ GSM) or ZET 7172S + ZET 7172M + ZET 7174/ZET7176 kit (data transmission via radio channel).

The-construction-of-a-measuring-network-based-on-ZET-7110-600x392

The number of gauges connected to ZET 7174 shall not exceed 4. ZETLAB software supports connection of up to 200 digital gauges to a single computer.

Specialized calculator

for calculating the required type of cables in the construction of measuring lines

Diagram of connecting to a measurement line

Scheme-of-connection-to-the-measuring-line 7110

Connecting strain measuring circuits

Control

of the ZET 7110 Digital Strain Gauges

All required settings are stored in the memory of the ZET 7110 measuring unit at factory. When independent setting of a digital tension gauge is required, for instance, in case of replacement of a primary transducer, connect the unit to a computer via the interface converter and launch Device Manager.

Measuring Unit Configuration

The "Setting" tab

This tab is used for setting measurement channel.

Settings tab 7110

Parameter	Changeability	Acceptable values	Description
Circuit	Yes	Bridge Half-bridge	Set “Half-bridge” for ZET 7×10 DS and ZET 7×10 DT digital gauges, and set ZET 7×10 depending on the connection circuit option of the external primary transducer
Frequency (Hz)	Yes	1 5 10 25 50 125	Sampling rate is a rate at which the digital gauge will register data
Calculation method	Yes	Transmission ratio Calibration curve	Set “Transmission ratio” parameter when the linear response of the primary transducer used in combination with the digital gauge is known. Set “Calibration curve” parameter when the linear response of the primary transducer is unknown but it is possible to perform its point calibration for the required measurement range.
Accuracy (%)	Yes	–	This parameter sets the value of measurement accuracy in per cent. Set this value in accordance with the technical specifications of the primary transducers used in combination with the ZET 7×10 and ZET 7111 digital gauges.
Unit	Yes	mV/V N kg t N/m kN/m MPa GPa etc.	The specified measurement units for identification of physical units in which the variable is measured. They are not used by the digital gauge for any conversions, however, it should be noted that when calculating Sp the parameter values shall be used in the relevant measurement units.
Gauge serial number	Yes	–	Set this parameter only in case of a requirement for identifying the serial number of the gauge connected to digital gauges of the ZET 7×10 and ZET 7111 series.

The "Gauge" tab

The “Gauge” tab indicates parameters of the connected tension or force gauge.

The Sensor tab 7110

Parameter	Changeability	Acceptable values	Description
Activity status	Yes	Off On	When an external primary transducer (gauge) is connected to digital gauges of the ZET 7×10 or ZET 7111 series, select “on” value.
Measurement range (in units)	Yes	–	This parameter defines the maximum range of the gauge measurement values. The parameter is indicated in the gauge certificate.
Sensibility (Sd)	Yes	–	The parameter defines the sensitivity of the external gauge. The parameter is indicated in the gauge certificate.

The "Tension Resistor" tab

The “Tension resistor” tab indicates sensing element parameters when bridge and half-bridge circuits are used.

The strain gauge 7110 tab

Parameter	Changeability	Acceptable values	Description
Activity status	Yes	Off On	Select “on” when external tension resistors are connected to digital gauges of the ZET 7×10 or ZET 7111 series.
Sensibility (Sr)	Yes	Depends on the circuit and selected measurement units	The parameter defines the sensibility of a digital gauge considering the used circuit and measurement unit. Sr value set for this parameter is calculated using formulas provided in Appendices B and C of the configuration manual

The "Calibration" tab

The “Calibration” tab is used for calibrating the digital gauge (measurement unit completed with a primary transducer).

Calibration tab 7110

The tab contains 10 points for calibrating the digital gauge within its measurement range.

The calibration is required only when the characteristics of the digital gauge (equipped with an in-built or external primary transducer) is unknown, but it may be possible to ensure a known load (or travel) impact within the whole measurement range.

The figure above shows an example of three-point calibration of ZET 7110 DT series gauge for operation in ±0.7 mm range. For calibration, the digital gauge was fixed on M4 mounting screws.

“Direct current voltage meter” software indicator in the “Measurement” menu on ZETLAB software pane defines the measured values for each of the three points of ZET 7110 DT digital gauge compression degree.

The reference value of 0.7 mm (point 3 in the calibration table) corresponds to the minimum degree of compression of the digital gauge sensing element and equals to the start of reaction to the compression of the digital gauge with compression screws.

The reference value of 0 mm (point 2 in the calibration table) corresponds to the medium compression degree and is determined by the magnitude set by turning the 0.7 mm thread pitch mounting screw 1 turn clockwise (0.7 mm *1 = 0.7 mm).

The reference value of 0.7 mm (point 1 in the calibration table) corresponds to the maximum compression degree and is determined by the magnitude set by turning the 0.7 mm thread pitch mounting screw 2 turns clockwise.

After calibration, press the “Save” button and then set the “Calibration curve” value of “Calculation method” on the “Settings” tab and set “mm” for “Measurement unit”, and save all the changes.

The “Displacement” tab

The “Displacement” tab is used to set displacement in the initial measurement point.

Offset tab 7110

Parameter	Changeability	Acceptable values	Description
Displacement	Yes	Off On	Turning the set displacement value on/off.
Displacement in unit	Yes	–	This parameter indicates the value necessary to be set as a current indication of the digital gauge.

Example No 1: it is known that a structure element was exposed to 500 MPa strain by the moment of the digital gauge installation, to account for the pre-loaded state of the structure element. Enter “500” value in the “Displacement for” field, select “On” in the “Displacement” field, then activate “Save” field; the digital gauge will start registering changes of the controlled structure element strain taking into account the 500 MPa stress.

Example No 2: after installation of tension resistors, the controlled structure element is in a position relative to which its deformation shall be measured. Enter “0” value in the “Displacement for” field, select “On” in the “Displacement” field, and then activate the “Save” field; the digital gauge will start registering the controlled structure element deformation relative to the set zero value.

Basic Configuration

of ZET 7110 Digital Strain Gauges

Laboratory version

Basic delivery scope of tension sensor includes:

digital sensor ZET 7110;
DIN-rail mounting panel for plastic modules 71×39;
set of operational documentation.

Industrial version

Basic delivery scope includes:

digital sensor ZET 7110in industrial casing;
plug for the cable FQ14-4TJ-7 (2 pcs.);
spring nozzle for 7 mm plug (2 pcs.);
connector for the cable FQ14-7TJ-8;
spring nozzle for 8 mm plug;
set of operational documentation.

POR (price on request)

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Necessary measuring equipment

supplied upon special order

ZET 7174
USB connection

ZET 7176
Ethernet connection

ZET 7173
Offline recorder

ZET 7177
GSM network connection

ZET 7110 Digital Strain Gauge Sensor

Specifications

Calculation Method

Synchronization

Hardware Versions

Advantages

No adjustment is needed

Measurement Results

PTS Power Supply

Reliability

Purpose

Note

Application Scope

Mechanical testing of materials

Deformation studies

Measurement of mechanical deformations

Stress determination

Operation Principles

Rules for Using in Explosion-Hazard Areas

Note

Connection Diagrams

Specialized calculator

Diagram of connecting to a measurement line

Connecting strain measuring circuits

Control

Measuring Unit Configuration

Basic Configuration

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Data protection notification

Necessary measuring equipment

ZETLAB

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