Posted 23 Oct 2014 I have helium cylinder. I want to have a control application where the process should stop when the pressure in the cylinder decreases to certain level. Can any one help me to find the right sensor? or application to do this. Thank you, SKR. Share this post Link to post Share on other sites
Posted 27 Oct 2014 You need a pressure switch. The important spec is the one in the column called "over range pressure". The pressure switch needs to have a over range pressure that is equal to or greater than the highest cylinder pressure when the cylinder is newly filled. If the over range pressure is less than the cylinder pressure, the setpoint can be affected/altered/changed by the over pressure. The models below have over range pressures in excess of 70 bar, which is a typical gas cylinder pressure, but you need to establish was pressure your helium cylinders come in at. If you do not have facilities for adjusting the setpoint, then I would recommend that you buy the switch from a vendor who can do the setpoing adjustment for some nominal fee. Share this post Link to post Share on other sites
Posted 28 Oct 2014 (edited) You don't necessarily need a pressure switch. A pressure sensor/transmitter will work as well, plus it's easier to change the setpoint. There are a variety of brands that will suit your needs. Rosemount is a good one. Foxboro is also very good, and not quite as expensive. Contact a sales rep to get the exact model. Note, if you're using this for a safety feature, then a pressure switch is probably better. Edited 28 Oct 2014 by MrAutomation Share this post Link to post Share on other sites
Posted 29 Oct 2014 Yes, this is for a safety feature. I'll try looking into pressure switches in the market. SKR. Share this post Link to post Share on other sites