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of BC 314-M digital threaded hydrophones
of BC 314-M digital threaded hydrophones
| SPECIFICATIONS | |
|---|---|
| Parameter gauged | instant values, 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 | CAN 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 | M20×1.5 |
| Weight (without cable) | |
| Cable length | 2 m (standard) |
| Measurements operation environment | water, air, oil and oil products, natural gas |
| Operation environment temperature | 0…+60 °C |
| Environment air temperature | −60…+80 °C |
* Referred to output in frequency band from 10 Hz to the band upper limit.
of BC 314-M digital threaded hydrophones
Hydrophone BC 314-M is a digital transducer is used to measure dynamic pressure in liquid environments with CAN 2.0 data interface. Measurement results are transmitted by Modbus protocol. A hydroacoustic antenna can be connected to PC via USB, Ethernet, GSM, radio channel:
Digital hydrophones integrated sensing element allows starting measurements right after it is switched on since the measurement process does not require measuring channel adjustments: all the essential parameters are pre-installed in gauge memory. The output signal of digital transducers contains measured pressure values; no additional processing of the results is required.
Digital hydrophones BC 314-M have an integral cable without a connector on the side of the measuring network. The diagram of connection to the measuring network is shown in the chart.
| CONTACT NUMBER | LABELLING | CABLE CONDUCTOR COLOUR |
|---|---|---|
| 1 | “+” (9…24) V | orange |
| 2 | CAN 2.0 line “A” | blue |
| 3 | CAN 2.0 line “A” | white-blue |
| 4 | GND | white-orange |
Frequency response characteristics of Hydrophone BC 314-M are shown in the chart
of BC 314-M digital threaded hydrophones
Hydrophone BC 314-M has a function of metrological diagnostic self-monitoring — the transducer serviceability auto-check in the course of its operation. Based on metrological self-monitoring positive results, it is possible to increase the inter-verification interval without implementing standard verification procedure.
For metrological self-monitoring of ZETSENSOR digital transducers in automatic mode, there has been developed special software.
“Self-check ZET 7XXX” main window is shown in the figure. On “Self-check” tab, the user can select a type of device, type of test, measurement process control and view the self-check results.
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.
The selector is used for choosing the test. To change test number, you have to click mouse left button on the number and to 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.
The indicator serves as a timer showing how much time is left before the current test will be finished. It starts the count as a test is begun. Test results are shown in the log.
of BC 314-M digital threaded hydrophones
BC 314-M digital threaded hydrophones are one of the principle measuring modules for leaks detection in leakage detection systems (LDS).
For the purpose of periodical Hydrophone BC 314-M calibration, a number of task-specific systems are implemented.
Even though such systems have a lot of unique technical features, the overall principle of their operation and use is quite similar.
Hydrophone calibration system is sound pressure source with 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 pistons to produce and maintain sound pressure level in accordance with the specified parameters.
Most of the systems utilized for Hydrophone BC 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 Hydrophone Calibrator (Type 4229).
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