Products > Test Equipment

Brymen BM786 - Case cracking

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robert.rozee:
do the cracks in the case compromise blast containment within the case? really, the bezel should have an inside overlap with the case and should be retained in place with a silicon sealant - thereby allowing for thermal expansion of one part without affecting the integrity of the other.


cheers,
rob   :-)

floobydust:
The Fluke 27 is not explosion-proof, I believe it's IS and given the cracks and age... you wouldn't be using it in Haz Loc anymore. 


For the Brymen multimeters, I don't see them having any ratings for water resistance, no IP rating.
Fluke 87V is IP30, Fluke 87V MAX is IP67, Fluke 17B+/187/189 no spec.
I rarely use a multimeter outdoors in snow and rain, on a boat etc.

I agree, the display window will need a flexible mount that is waterproof but this adds manufacturing cost.
Hopefully Dave is talking with them about the cracking.

joeqsmith:

--- Quote from: floobydust on December 06, 2024, 06:58:24 pm ---My wild theory is the cracking is due to different thermal expansion coefficients between the two plastics - the cast acrylic display window and the multimeter enclosure. To keep it sealed, the window is glued in place, rigid. So I would imagine high strain along the edge axis.
...

--- End quote ---

I would have thought they used the same plastic.  I did run a fair amount of thermal tests on various meters, including shock.  If it is a TC, I'm surprised none of them cracked. 

My guess is ozone machines.

stj:
some plastic shrinks slowly with age.
Nintendo got hit by this on some of the early twin-screen handhelds - the plastic hinge shrank around a steel core and cracked.
interestingly it effected some colours of case more than others!

EEVblog:
First I've heard of that. I might have a parts unit front face moulding somewhere.

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