ВС 314-M DIGITAL THREADED HYDROPHONE

  • hydrophone with CAN 2.0 digital output;
  • measurement results are transmitted via Modbus protocol;
  • reading-through and measuring acoustic signals and noise spreading in liquids;
  • used as receiver hydroacoustic antennas components;
  • used for measurements by cutting-in to the wall of sealed vessel or pipe.

From 2135 USD

PURPOSE

of ВС 314-М digital threaded hydrophones

MEASUREMENT

  • sound spreading in water;
  • noise in wet and polluted environment;
  • sound in liquid and gas environment (laboratory and factory).

APPLICATION IN HYDROACOUSTICS

  • monitoring of waterborne sounds;
  • measurement targets.

SPECIFICATIONS

of ВС 314-М digital threaded hydrophones

SPECIFICATIONS
Parameter gauged instantaneous, RMS, peak Pa, kPa
Measuring range 100 kPa
Self-noise*, RMS 0.1 Pa
Frequency band 20…3,200 Hz
Type of transducers connected integrated piezo transducer
Tolerance limit of sound pressure range gauging 10%
Limit measured dynamic pressure 50 kPa
Limit hydrostatic pressure 7 MPa
Data output frequency 12,000, 8,000, 4,000, 2,000, 1,000, 500,
if non-instantaneous values output — 10 Hz
Data interface СAN 2.0
Device power 9 to 24
Current consumption at 12 V voltage up to 50 mA
Reading Frequency Response available (diagnostics)
Sensing element integrity check available (diagnostics)
Power check available (diagnostics)
Synchronization by Precision Time Protocol (PTP)
Casing material stainless steel
Dimensions (length × casing diameter) 171×⌀23 mm
Coupling thread М20×1.5
Weight (without cable)
Cable length 2 m (standard)
Measurements operation environment water, air, oil and oil products, natural gas
Operation environment temperature 0…+60 °С
Environment air temperature −60…+80 °С

Referred to output in frequency band from 10 Hz to the band upper limit.

CONNECTION DIAGRAM

of ВС 314-М digital threaded hydrophones

Hydrophone ВС 314-M is a digital transducer to measure dynamic pressure in liquid environments with CAN 2.0 data interface. Measurement results are transmitted over Modbus protocol. Hydroacoustic antenna can be connected to PC via USB, Ethernet, GSM, radio channel:
Построение измерительной сети

Digital hydrophones integrated gauge allows starting measurements right after it is switched on since carrying out measurements does not require measuring channel adjustments: all essential parameters are pre-installed  in gauge memory. Output signal of digital transducers contains measured pressure values; no additional processing of the results is required.

Instrument communications network connection

Proximal to instrument communications net connection, Hydrophones ВС 314-M have a no-connector integral cable. The table shows Instrument communications net connection diagram.

CONTACT NUMBER DESIGNATION CABLE CONDUCTOR COLOUR
1 “+” (9…24) V orange
2 CAN 2.0 line “А” blue
3 CAN 2.0 line “А” white-blue
4 GND white-orange

ВС 314-М HYDROPHONES OPERATION IN RECEIVER MODE

Frequency response of Hydrophone ВС 314-M are shown in the chart

Неравномерность АЧХ цифровых гидрофонов ВС 314-М

METROLOGICAL SELF-MONITORING

of ВС 314-М digital threaded hydrophones

Hydrophone ВС 314-M metrological diagnostic self-monitoring function is implemented — the transducer serviceability auto-check during operation. Based on metrological self-monitoring positive results, it is possible to increase inter-verification interval without standard verification procedure.

For metrological self-monitoring of ZETSENSOR digital transducers in automatic 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.

Метрологический самоконтроль ВС 314

Test impacts 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 click mouse left button on the element, and 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 unchangeable till the moment the user stops the project operation or till self-check is finished.
There is a button to activate and stop measurements. During diagnostics the button is green, and grey when stopped.

Indicator serves as 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.

PRACTICAL APPLICATION

of ВС 314-М digital threaded hydrophones

Leakage detection system

ВС 314-М digital threaded hydrophones are one of the principle measuring modules for leaks detection in leakage detection systems (LDS).

DSC

Hydrophone calibration

For the purpose of periodical Hydrophone ВС 314-M calibration a number of dedicated systems are used.
Even though such systems have a lot of unique technical features, the overall principle of their operation and use is quiet similar.
Hydrophone calibration system is sound pressure source having precise parameters. It should be noted that the hydrophone calibration system itself should undergo obligatory factory calibration, so that to make sure that the sound pressure level parameters of the hydrophone calibration system meet necessary requirements.
Hydrophone calibration system structure is similar to that of pistonphone – it has a coupler cavity, set of pistons and a rotating part causing the pistones to produce and maintain sound pressure level in accordance with the specified parameters.
Most of the systems used for Hydrophone ВС 314-M calibration can be used in the field environment and preserve their operational and functional parameters in various humidity, temperature and pressure environments.

All the hydrophones manufactured by ZETLAB Company undergo obligatory calibration with the use of Brüel & Kjær Hydropnone Calibrator (Type 4229).

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