Digital short-period seismometer ZET 7156-VER.1

frequency range 0,3…100 Hz
CAN 2.0 interface

POR (price on request)

* Minimum order value: from 7 700 USD

Note

The minimal kit required for measurements performance includes a digital transducer and an interface converter with ZETLAB Software.
The interface converter is to be purchased separately.

Specifications

of Digital short-period seismometer ZET 7156-VER.1

Metrological specifications
Measured physical value	vibration velocity
Number of axes	3 (X, Y, Z)
Frequency range	from 0,3 up to 100 Hz
Output values	instant
Measurement range	from 0,0015 up to 5 mm/s
Measurements error	10 %
Intinsic noise level for: vibration velocity vibration acceleration vibration displacement	max. 05 μm/s max. 6 μm/s2 max. 0.2 μm
Real-time perfomance monitoring	synchronization quality, data quality
Measurement reliability control	sensing element integrity control, measurement circuit control
Technical specifications
Data refresh rate	50, 100, 200, 500, 1000 Hz
Amplification ratio	1, 8, 128
Sensor type	integrated sensing element
Data transfer interface	CAN 2.0
Exchange speed	100, 300, 1000 kbps
Operational specifications
Dimensions	110×70,5×70,5 mm
Dimenions of the mounting plate	129×70,5×3 mm
Weight	500 g
Device power	from 9 up to 24 V
Consumed power	0,5 W
Operating temperature range for industrial version/ for explosion-proof version	from -40 up to +60 °C from -60 up to +85 °C
Electromagnetic compatibility EMC
IEC 61000-4-2, ESD	contact 4 kV, air 8 kV
IEC 61000-4-4, EFT	power supply 0,5 kV, signal 0,25 kV
IEC 61000-4-5, Surge	500 V

* Increase of amplification ratio leads to a proportional reduction of the digital seismometer’s measurement range

Advantages

of Digital short-period seismometer ZET 7156-VER.1

High sensitivity

Metrological self-control

User-friendly design

High reliability

Function

of Digital short-period seismometer ZET 7156-VER.1

Digital short-period seismometer ZET 7156-VER.1 is used for vibration velocity measurements of various structures: elevated (raised and restrictive) and underground (foundations, piles, etc).

The seismometer consists of three identical sensing elements and a measuring module integrated into a single package. The sensing elements receive low-frequency mechanical oscillations by three mutually transverse axes X, Y, Z and transform them into analog signal, while the measuring module performs digital processing of the analog signal with further transfer of the processed data via CAN 2.0 interface.

CAN measuring system synchronization mechanism allows to perform automated synchronization of ZET 7156-VER.1 seismometers with a precision up to 10 microseconds (synchronization is possible regardless of the measuring line length and the sensors amount).

Digital short-period seismometer ZET 7156-VER.1 is intended for integration into automated monitoring, control and surveillance systems.

Application spheres

of Digital short-period seismometer ZET 7156-VER.1

ZET 7156-VER.1 digital short-period seismometer (geophone) is used within automated estructural health moniotoring systems as well as for control of constructions natural vibration frequencies and corresponding logarithmic damping decrements. ZET 7156-VER.1 digital short-period seismometer can also be used within leak control systems for section vibration control monitoring allowing to prevent false system alarm.

Engineering structures monitoring system

Connection diagrams

of ZET 7156-VER.1 digital short-period seismometer

Digital short-period seismometers ZET 7156-VER.1 are connected sequentially within the measuring network and the resulting measuring structure is connected to the PC via ZET 7174 interface converter (CAN ↔ USB), ZET 7176 (CAN ↔ Ethernet or Wi-Fi). The measurement network can also be supplemented with GSM ZET 7177 digital data transfer modules (CAN ↔ GSM) in the case if Ethernet connection is unavailable or when it is necessary to establish wireless backup data transfer channel.

Connection via the CAN 2.0 ZET 7156 digital short-period seismometer

ZET 7156-VER.1 digital short-period seismometers (geophones) have two four-contact FQ14-4ZK-S ports for connection to the measuring network (mating connector is included into delivery scope).
The table below shows sensor and mating connector contact points designation for connection to the measuring network.

Specialized calculator

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

Contact point number	Connection to the measuring network
1	+(9…24) V
2	CAN 2.0 line «H»
3	CAN 2.0 line «L»
4	GND

Control

of ZET 7156-VER.1 digital short-period seismometer

All necessary settings of digital sensors are stored in the measuring module memory, which is integrated into ZET 7156-VER.1 digital short-period seismometer. For changing settings of the digital seismic meter (for instance, when establishing measuring network it is necessary to set device address), one should connect the device to the PC using interface converter and start “Device manager” program.
The-software-tab One can also adjust “Data refresh rate” parameter within the range from 50 to 1000 Hz.

ZET 7156-VER.1 digital short-period seismometer also has automated calibration option.

DOWNLOAD

Complete User Manual for ZET 7156

Metrological self-monitoring

of ZET 7156-VER.1 digital short-period seismometers

Digital short-period seismometer ZET 7156-VER.1 (geophone) has integrated metrological diagnostic self-monitoring function — the sensor serviceability auto-check during operation. Based on metrological self-monitoring positive results, it is possible to increase inter-verification interval without implementing standard verification procedure.

For metrological self-monitoring of ZETSENSOR digital transducers in automated mode, special software has been developed.

“Self-check ZET 7XXX” main window is shown in the figure. On “Self-check” tab, user can select type of device, type of test, measurement process control and get the self-check results.

Window of the program Metrological self-control

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 click mouse left button on the number, and 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 procedure is finished.
There is a button to activate and stop the measurements. During diagnostics the button is green, and grey when stopped.

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 7156-VER.1 digital short-period seismometer

Digital sessmometer complete with mounting plate

Basic configuration of Digital short-period seismometer ZET 7156-VER.1 includes:

Digital short-period seismometer ZET 7156-VER.1;
plug for the cable FQ14-4TJ-7 (2 pcs);
spring hose for 7 mm connection (2 pcs);
mounting plate;
mounting kit for ZET 7156-VER.1;
set of operational documentation.

POR (price on request)

Necessary measuring products

supplied upon request

ZET 7176
Ethernet Connection

ZET 7174
USB Connection

Measuring line connector
ZET 7001-M
Used for measuring lines connection

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Digital short-period seismometer ZET 7156-VER.1

Specifications

Advantages

High sensitivity

Metrological self-control

User-friendly design

High reliability

Function

Application spheres

Connection diagrams

Specialized calculator

Control

DOWNLOAD

Metrological self-monitoring

Test impact types

Basic configuration

Necessary measuring products

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