where expertise comes together - since 1996 -

The Largest Open Access Portal of Nondestructive Testing (NDT)

Conference Proceedings, Articles, News, Exhibition, Forum, Network and more

where expertise comes together
- since 1996 -

NT - Nove technologie s.r.o.
Ultrasonic gel for NDT application. Various types of ultrasonic agents. Starsonic SS2, SS3

847 views
Technical Discussions
Chad
Chad
02:39 Jun-12-2008
UT transducer connecting

I seem to recall being told one time that you should not connect your transducer to your flaw detector while the machine is on. Is this correct or does it not matter one way or the other?


    
 
 
Michel Couture
NDT Inspector,
consultant, Canada, Joined Sep 2006, 822

Michel Couture

NDT Inspector,
consultant,
Canada,
Joined Sep 2006
822
07:03 Jun-15-2008
Re: UT transducer connecting
Hi Chad,

I've been told the same by someone at one time who was told also. Personnaly, I don't know if it makes much difference. I'm sure someone else will write with their opinion as well. The reasons I see not to do so are as follow: If you are working in an environment where the danger of explosion exist. I have personnally notice the little spark when you connect your transducer (specially with a microdot connector). So, there is a danger there. I don't know about your industry, but it is not something you want to try in an aircraft fuel tank.
The other reason would have to do with the computer inside the UT instrument. Same as for our PC at home, sometimes you have to reboot your PC for any changes you've made to take effect. I'm speculating here, but I wouldn't pass it by some IT guys to want to do it that way.

Cheerios,

Michel

----------- Start Original Message -----------
: I seem to recall being told one time that you should not connect your transducer to your flaw detector while the machine is on. Is this correct or does it not matter one way or the other?
------------ End Original Message ------------




    
 
 
Linas Svilainis
R & D,
Kaunas University of Technology, Lithuania, Joined Nov 1998, 67

Linas Svilainis

R & D,
Kaunas University of Technology,
Lithuania,
Joined Nov 1998
67
09:52 Jun-16-2008
Re: UT transducer connecting
----------- Start Original Message -----------
: I seem to recall being told one time that you should not connect your transducer to your flaw detector while the machine is on. Is this correct or does it not matter one way or the other?
------------ End Original Message ------------
If you are speaking about passive probe, this requirement is probably for safety issues.
1.The connector (BNC,SMA ) that is usually used to connect transducer to equipment is not designed for "pre-mating earth".
2.Not all equipment have a galvanic isolation of "hot" center tap.
This means that there is a possibility to connect a center tap first. In such case the operator can get electrical shock.
Speaking of active probe (with preamp inside or array) this requirement is applicable for equipment that is not designed for "hot plug".
Despite everything said people DO CONNECT transducers while equipment is on and no one was seriously hurt or equipment damaged.
My advise would be to follow this rule.

regards,

Linas




    
 
 
Tom Nelligan
Engineering,
retired, USA, Joined Nov 1998, 390

Tom Nelligan

Engineering,
retired,
USA,
Joined Nov 1998
390
04:57 Jun-16-2008
Re: UT transducer connecting
With typical commercial flaw detectors and thickness gages, there is no reasonable likelihood of either personal injury or damage to the instrument. While it is certainly possible to get a spark -- a very important issue if you're working in a combustible environment -- typical spike and square wave excitation pulses from portable instruments pose no shock hazard under normal conditions.

There may be some nonstandard instruments out there that represent an exception, so if you want to err on the side of caution, act accordingly. But in 30 years of working in ultrasonic NDT I've never heard of this being a safely problem, combustible environments excepted.

----------- Start Original Message -----------
: I seem to recall being told one time that you should not connect your transducer to your flaw detector while the machine is on. Is this correct or does it not matter one way or the other?
------------ End Original Message ------------




    
 
 

Product Spotlight

GEKKO, Standard and Advanced phased-array for Easier inspection

With a 64-channel parallel architecture, GEKKO is a flaw detector offering at the same time conven
...
tional UT, standard PAUT, TOFD and real-time Total Focusing Method (TFM). GEKKO improves the detection, with better defects characterization and sizing as well as for misoriented defects. Some procedures require standard UT, others TOFD or PA. GEKKO includes all these techniques to offer a versatile and field-ready equipment. - 64:64 parallel channels - + 4 additional TOFD - Conventional UT channels - International code compliance: ASME, AWS, API, ASTM, ISO-EN Watch the video: https://youtu.be/kuEY_RwWS3Q
>

NEW! The PragmaPro Instrument Platform

The PragmaPro is based on a modular cartridge technology and supports various NDT instrument modal
...
ities such as UT, PAUT, ECT and many more. This new platform is based on a machined, powder-coated aluminum frame for shock-proofness, best sealing qualities and maximum heat dissipation. This is practical to extend the outdoor temperature range and/or to extend the power injected in the transducers. The PragmaPro is aiming at a very wide range of applications, such as weld scanning, corrosion mapping and composite testing.
>

Ultrasonic tomograph for imaging of concrete structures А1040 MIRA

Applicable for concrete inspection allowing imaging of the internal structure of objects from conc
...
rete, reinforced concrete, different stones. The operation applies pulse-echo technique at one-side access to the object. The instrument is feasible for concrete inspection for searching conduct ducts, conduits, detection of foreign inclusions, holes, honeycombing, cracks and other concrete defects.
>

Magnetic X-Ray Pipeline Crawler

Zhong Yi brand pipeline crawler is magnetic/micro-video controlled crawler with DC X ray unit inst
...
alled for checking welding of pipeline. Move steadily inside the pipeline 6''-60''diameter with speed of up to 18m/min, Max. moving diatance 5 kilometers and provide the efficient inspection of the pipeline.
>

Share...
We use technical and analytics cookies to ensure that we will give you the best experience of our website - More Info
Accept
top
this is debug window
s