| ??? 08/21/12 23:39 Read: times |
#188109 - Designing a product for use in water |
Hey all,
I know this probably isn't the best place to post this, but I do know that the active members here are incredibly intelligent and have years of experience. If this isn't appropriate, please feel free to delete this thread. I also realize this could develop more into paid consulting, which I'm also open to. I just haven't come across a forum that has a similar level of expertise :) Anyways, I have been tasked with developing a system that will utilize a touchscreen/knob combination that the user will use while they are standing in a swimming pool. The display will be mounted to a frame, with several low voltage/current cables in a conduit going between it and the rest of the system. Everything in the electrical room, and by extension the display, will be on GFI breakers. The unit will likely run on 24vDC, and the highest voltage internally would be for the displays' LED backlight, at ~30vDC. I've designed a system (on paper) that would work great - out of the water. I'm just apprehensive about throwing a user in front of it while they're standing in a swimming pool without having the design looked over by a more experienced set of eyes. The interface itself would consist of a plastic enclosure, the touch panel, and the knob. Internally there would be the display and the processor board. The touchpanel is rugged and designed to be water resistant [link]. The outside edge of the touch panel would be sealed to the enclosure. The knob is a sealed potentiometer, and would be a basic 3.3v voltage divider to get position. The conduit connection would also be sealed. I guess I'm curious to know if there are published standards/tips I should follow when finalizing this design. I've done some research, but haven't found much at all. I just need to ensure that nothing bad will happen, even if the display itself falls in the water. Or, is it as simple as sealing the touchpanel, having a good connection to ground from the panel, and a GFI breaker? Should the analog lines to the touchpanel and knob be isolated? etc. I also looked a bit at some off the shelf industrial automation displays/systems, but I have the same concerns about them before throwing a user in front of them. Any advice would be greatly appreciated, -Dave "The more I learn, the more I discover I didn't know." |
| Topic | Author | Date |
| Designing a product for use in water | 01/01/70 00:00 | |
| Have you considered silicone coating? | 01/01/70 00:00 | |
| one link | 01/01/70 00:00 | |
| Waterproof enclosures | 01/01/70 00:00 | |
| Projective touch - or maybe waterproof tablet | 01/01/70 00:00 | |
| If that potentiometer wasn't a hard requirement | 01/01/70 00:00 | |
| more details | 01/01/70 00:00 | |
| You might want to look into that a bit further | 01/01/70 00:00 | |
| buttons for up/down gives tactile feedback | 01/01/70 00:00 | |
| nevertheless, a strobe wheel rather than a pot ... | 01/01/70 00:00 | |
| more good ideas | 01/01/70 00:00 | |
| Go to the lowest practical voltage | 01/01/70 00:00 | |
| answers | 01/01/70 00:00 | |
| Electric shock and intrinsically safe | 01/01/70 00:00 | |
| Isolators | 01/01/70 00:00 | |
| a question and a reference | 01/01/70 00:00 | |
| answers | 01/01/70 00:00 | |
| tethered unit?? | 01/01/70 00:00 | |
| mounted display | 01/01/70 00:00 | |
| have you considered a combination of battery and solar? | 01/01/70 00:00 | |
| indoor pool | 01/01/70 00:00 | |
Wireless chargers | 01/01/70 00:00 |