ZET 7110-DS digital small strain gauge

  • Tensile and compression testing
  • CAN 2.0 interface
  • Self-monitoring

From 767 USD

* Minimum order value: from 7 700 USD

Specifications

of ZET 7110-DS digital small strain gauge

Metrological specifications
Measured parameter deformation, strain
Sensor type integrated sensing element
Measured range -1800…+1800 µm/m
Measurement range without the use of mounting panel -300…+300 µm/m
Measurement range with the use of mounting panels (in different mounting points) -450…+450 µm/m
-600…+600 µm/m
-1800…+1800 µm/m
Sensitivity threshold depending on the range, µm/m:
from -300 to +300
from -450 to +450;
from -600 to +600;
from -1800 to +1800.
2 µm/m
3 µm/m
4 µm/m
12 µm/m
Temperature impact on sensitivity, 10 °С (from the measuring range) 2 %
24 hours zero drift 0,5 %
Restoring force 1000 N
Failure strain (without the use of mounting panels) 500 µm/m
Operability control in real time mode sensor temperature
synchronization quality
data quality
Measurement reliability check sensing element integrity check
measuring circuit range
Technical specifications
Data interface CAN 2.0
Exchange speed 100, 300, 1000 kbps
Data output frequency 1 Hz
Operational specifications
Dimensions 197×56×30 mm
Weight 300 g
Device power from 9 to 24 V
Consumed power 0,5 W
Polarity reversal protection yes
Operational temperature range from -40 to +100 °С
Available product versions Standard (protection class IP65)
Explosion-proof* (explosion protection class 0ЕхiaIICT6 Х (IP67))
Electromagnetic compatibility EMC
IEC 61000-4-2, ESD contact 8 kV, air 15 kV
IEC 61000-4-4, EFT power 4 kV, signal 2 kV
IEC 61000-4-5, Surge 4000 V

* The price is calculated on individual basis

  • Synchronization

    Interface converter synchronizes digital sensors with each other. This allows to control mutual positioning and operation of the digital sensors and to obtain envelope diagrams.

Function

of ZET 7110-DS digital small strain gauge

ZET 7110-DS digital small strain gauge (with integrated strain gauge) is used for stress strain state control of concrete structures, it is used within the scope of engineering structures monitoring systems (both stationary and mobile).

Digital small strain gauge is used for stress-strain state control and alarm notification in the case of elastic range of stress value exceeding. ZET 7110-DS digital small strain gauge is supplied in air-tight shock-proof package with dust and moist protection.

Advantages

of ZET 7110-DS digital small strain gauge

Measurement results

are displayed in digital format

No adjustment required

all characteristics are stored in the measuring module memory

Integrated PT

the calculations are performed in close vicinity to the PT

User-friendly design

easy installation and measurements performance

Reliability

stable operational charactericstics

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

DIGITAL SMALL STRAIN GAUGES 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

Operating principles

of ZET 7110-DS digital small strain gauge

ZET 7110-DS digital small strain gauge consists of a primary transducer and ZET 7110 measuring module.

Each digital small strain gauge can be configured individually depending on particular requirements. Configuration is saved in ZET 7110 measuring module memory. Thus, using digital strain gauges allows to start measurements immediately without any additional settings – the results are displayed in the set measuring values (kg, N, Pa, mm, etc.).

ZET 7110-DS digital small strain gauges have two FQ14-4ZK-S 4-contact connectors for connection to measuring network (mating connector is included into delivery scope).

The sensors are fixed on the controlled object while the interface units ensuring information transmission are placed inside of electrical cabinet.

ZETSENSOR elecrical cabinet is more compact than available analog versions. ZETSENSOR digital modules are easy to install and de-install, they also have power supply and data transfer digital indication, which simplifies in-place diagnostics of the system.

Разъёмы цифрового датчика
Contact #Designation
1+(9…24) V
2CAN 2.0 line “H”
3CAN 2.0 line “L”
4GND

Mounting

of ZET 7110-DS digital small strain gauge

In order to evaluate deformation level of the controlled object it is necessary to make sure that the sensor mounting axis is aligned with the controlled deformation direction during mounting of the sensor.

The sensor is mounted on the controlled object via two points and a slot, which allows to mount the sensor at a distance of 180±5 mm.

For sensors mounting on a concrete surface tie bolts and anchor connections with M6 thread are used.

Mounting on steel surface should be performed by means of weld stud M6 or M6 mounting bolts.

In the course of ZET 7110-DS digital small strain gauge mounting it is necessary to provide reliable fixation at the mounting points in order to avoid slipping or displacement. For reliable fixation it is recomended to use DIN 6798 A stainless serrated washer “M6”.

Relative deformation measurements range depends on particular mounting technique used.

Temperature fluctuations: impact on measurements results

of ZET 7110-DS digital small strain gauge

For measurements in the range of 20 °С, the gauge readings error is within 10 µm/m. Below you can see an example – measurements of Digital small strain gauge sensor ZET 7110-DS mounted on a steel U-section.

ZET 7110 DS readings

Показания цифрового тензометрического датчика ZET 7110 DS

Temperature profile (digital temperature sensor readings)

Профиль температуры (показания цифрового датчика температуры)

Practical application

of ZET 7110-DS digital small strain gauge

Stress strainstate

Measuring network diagram

based on ZET 7110-DS digital small strain gauge

For establishing of the measuring network, ZET 7110-DS digital small strain gauges are connected sequentially. The resulting measuring chain is connected to PC via interface converters ZET 7174 (CAN ↔ USB), ZET 7176 (CAN ↔ Ethernet or Wi-Fi), ZET 7177 (CAN ↔ GSM).

For visual representation of the measured values one can use such programs as “DC Voltmeter”, “Multi-channel recorder” and other programs included into the scope of ZETLAB SENSOR Software (supplied together with interface modules). In the case if visual representation of a large amount of measuring channels is necessary, one can use Multichannel measurement system program. Depending on program settings, the measurement results can be represented as force, weight, displacement, torque and other parameters.

Измерительная сеть на базе цифровых датчиков малых деформаций ZET 7110 DS

Измерительная сеть на базе ZET 7110 DS

Control

of ZET 7110-DS digital small strain gauge

All necessary settings are saved in ZET 7110-DS measuring module memory. In the case if it is necessary to change the settings of the digital sensor (for instance, during periodical verification), one should connect the module to PC via interface converter and start “Device manager” program.

Measuring module configuration

«Settings» tab

Measuring channel settings

Вкладка «Настройки»

Parameter Adjustable? Acceptable values Description
Data refresh rate, Hz Yes 1
5
25
125
Sampling frequency (for ZET 7110-DS digital small strain gauge)
Physical value Yes Deformation
Strain
“Deformation” value is selected in the case if it is necessary to control relative deformation.
“Strain” value is selected when it is necessary to measure strain value (and the material elasticity module is known)
Measuring unit Yes µm/m
mm/m
cm/m
m/m
%
Pa
kPa
MPa
The values are used for identification of measurements physical units
Measuring units − «µm/m», «mm/m», «cm/m», «m/m», «%»  relate to the parameter «Physical value» − «Deformation».
Measuring units − «Pa», «kPa», «MPa» relate to the parameter «Physical value» − «Strain»
Young’s modulus

(modulus of elasticity) hPa

Yes Young’s modulus (modulus of elasticity) is a physical value characterizing material resistance to deformation.
This parameter can be selected if «Physical value» − «Strain» option is chosen.
Mounting option Yes A (±300 µm/m)
B (±450 µm/m)
C (±600 µm/m)
D (±1800 µm/m)
Gauge measuring range depends on particular mounting option implemented.

"Measurements" tab

“Measurements” tab contains measuring channel information. This tab allows to set measuring channel name.

Вкладка «Измерения»

"Offset" tab

“Offset” tab allows to set gauge readings offset value.

Вкладка «Смещение»

Parameter Adjustable? Accepted values Description
Offset state Yes off
on
Activation / deactivation of resetting the measured data to the value specified in “Offset units” parameter
Offset values Yes Allows to assign a value to be set as the current one for the digital sensor. All further readings changes will be processed in accordance with the value set.

Digital sensors:

examples of “Offset” function use 

Example #1
It is know that the structure element has been exposed to a pre-strain impact in the amount of 500 mPa prior to sensor mounting. In order to take the pre-stressed state into consideration, set “500” in the “Offset values” Section and “On” in the “Offset state” Section, then click “Save” key. The digital sensor will then start recording the controlled object stress-strain state based on pre-stressed value of 500 mPa.

Example #2
Upon completion of strain gauge sensors mounting, the controlled object is placed into position, starting from which it is necessary to start deformation control measurements. Set “0” into “Offset value” Section and “Off” in the “Offset state” Section, then click “Save” key. The digital sensor will start recording the controlled object stress-strain state from the set “zero” position.

Parameters configuration: general information

ZET 7х10 DS digital small strain gauge has an integrated resistive-strain sensor with bridge-connection mounting.

ZET 7х10 DS digital small strain gauge configuration procedure:
—  Relative deformation measurements: set the following parameters in “Settings” tab:
—  Physical value – “Deformation”;
—  Measuring units– set the required measuring values («µm/m», «mm/m», «cm/m», «m/m», «%»);
—  Mounting option – select mounting option of ZET7x10 DS digital sensor («A (±300 µm/m)», «B (±450 µm/m)», «C (±600 µm/m)», «D (±1800 µm/m)»).
—  Material strain measurements: set the following parameters in “Settings” tab:
— Physical value – “Strain”;
— Measuring units– set the required measuring values  («Pa», «kPa», «mPa»).
—  Young’s modulus, hPa – set the controlled structure element elasticity modulus (elasticity modulus values of some of the materials are specified in the Table below);
—  Mounting option – allows to select ZET7x10 DS digital sensor mounting option («A (±300 µm/m)», «B (±450 µm/m)», «C (±600µm/m)», «D (±1800 µm/m)»).

Material  Modulus of elasticity value (E) (hPa)
Aluminium 69
Copper 100
Steel 210
Glass 60
Concrete 20

Metrological self-monitoring

of ZET 7110-DS digital small strain gauge

Small strain gauge sensor ZET 7110-DS has metrological diagnostic self-monitoring function — in particular, auto-check of sensor serviceability while being in operation. Based on positive results of metrological self-monitoring, it is possible to increase inter-verification interval without implementing standard verification procedure.

There has been developed a special software for metrological self-monitoring of ZETSENSOR digital transducers in automatic mode.

Main window of “Metrological self-monitoring ZET 7XXX” software is shown in the figure. The “Metrological self-monitoring” tab allows user to select the type of device, test type, measurements control and to receive the self-check results.

Метрологический самоконтроль ZET 7110

Test impact types

AC - alternating signal

FR: «Required frequency value»: «Frequency tolerance» – alternating signal frequency;

AM: «Required signal amplitude value»: «Signal amplitude tolerance» – alternating signal amplitude;

OF: «Generated signal bias»: «Generated signal bias tolerance» – generated signal bias;

TM: «Signal analysis time» – signal control time (minimal signal analysis time for transient processes or long-time tests)

Example:
AC;FR:0.5:0.01;AM:0.4:0.002;OF:0.1:0.0001;TM:5
Alternating signal with frequency: 0.5 ± 0.01 Hz, amplitude: 0.4 ± 0.002 V, bias: 0.1 ± 0.0001 V, minimal signal control time – 5 s.

DC - constant signal

LE: «Required signal level»: «Signal level tolerance» – generated signal level.

TM: «Signal analysis time» – control signal time (signal analysis minimal time for transient and long-time processes tests)

Example:
DC;LE:0.5:0.001;TM:5
constant signal: 0.5 ± 0.001 V, minimal signal control time – 5 s.

ST1 - stepwise change

AM: «Minimal value»: «Maximum value» – change range.

TM: «Signal setting time» – time before signal control start

Example:
ST1;AM:100:200;TM:5
stepwise change: for 100..200 units, minimal signal control time – 5 s.

ST2 - stepwise change

MD: «Minimal change»: «Maximum change» – change amplitude.

TM: «Signal setting time» – time before signal control start

Example:
ST2;MD:10:10.5;TM:6
stepwise change: for 10..10.5 units in modulus, minimal signal control time – 6 s.

PPS - Pulse-per-second signal

SP: «Acceptable counts deviation» – amount of counts before or after start of a second.

Level change to be checked one time in a second.

Example:
PPS;SP:2 –
the change should take place in the beginning of a second, 2 counts.

Device type is selected from the dropdown list. To select the device type you have to left-click the element, and to select the required device to be checked from the pop-up list.

Selector is used to choose the test. To change test number you have to left-click the number and to set the required value with the scroll wheel. If self-check is run, selector remains inactive till the moment the user stops the project operation or till the self-check is finished.
There is a button to activate and stop the measurements. During diagnostics the button is green, and grey when the diagnostics process is suspended.

Indicator serves as a timer showing how much time is left before the current test is finished. It takes the count after any test is begun. Test results are shown in the log.

Basic configuration

of ZET 7110-DS digital small strain gauge

Базовый комплект поставки ZET 7X10-DS

Small strain gauge sensor ZET 7110-DS basic delivery scope includes:

  • ZET 7110-DS digital small strain gauge;
  • plug for the cable FQ14-4TJ-7 (2 pcs.);
  • spring hose for 7 mm connection (2 pcs.);
  • mounting plates*;
  • mounting hardware kit #3 for ZET 7х10-DS;
  • set of operational documentation.

* Mounting plates are used for digital sensors installation on steel surface.
(Supplied upon request)

Necessary measuring products

supplied upon request

ZET 7174
ZET 7174
USB Connection

ZET 7176
ZET 7176
Ethernet Connection

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