LarryF Posted November 14, 2014 Report Share Posted November 14, 2014 The WM transmitter has 5 vent holes arranged in a small circle on the back panel. We had a customer cover the vent holes on about 20 units with a metal plate (label). Seventeen of these units then ruined the membrane switch surface due to internal pressure build up as the units were moved from cool surroundings to much warmer areas. In operation, the units are very airtight except for the vent. It has a Goretex seal that blocks water but passes air. We will mark all future units with engraving on the back plate that says "Don't block this vent". We put five holes back there because the milling equipment doesn't care and we figured it would be impossible for dirt or gunk to block all the holes. In sum, don't put labels over the vent holes. Best Regards, Larry Fisher Lectrosonics Quote Link to comment Share on other sites More sharing options...
Freeheel Posted November 15, 2014 Report Share Posted November 15, 2014 Good to know. I haven't seen anything that looks like a vent on the mm 400 series, is this the case? Cheers, Brent Calkin Quote Link to comment Share on other sites More sharing options...
LarryF Posted November 15, 2014 Author Report Share Posted November 15, 2014 Hi Brent, No vent on the MM400. There is no membrane keypad to lift up. The pressure just builds up until it goes off like a bomb, destroying everything in a 30 foot radius. Fortunately, there have only been two reported cases. Best Regards, Larry Fisher Lectrosonics Quote Link to comment Share on other sites More sharing options...
Freeheel Posted November 15, 2014 Report Share Posted November 15, 2014 Damn, well, make that 3 reported cases then. I didn't report it 'cause I was storing that MM400 with all my zombie apocalypse gear and wasn't sure exactly what had blown up. I'll drill holes and tape on some goretex to retrofit my remaining MM's. Cheers, Brent Calkin Quote Link to comment Share on other sites More sharing options...
osa Posted November 16, 2014 Report Share Posted November 16, 2014 Damn, well, make that 3 reported cases then. I didn't report it 'cause I was storing that MM400 with all my zombie apocalypse gear and wasn't sure exactly what had blown up. I'll drill holes and tape on some goretex to retrofit my remaining MM's. Cheers, Brent Calkin + 1.5 !! Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.