On Thursday, 10 March 2022 09:23:31 EST Scott Harwell via Emc-users wrote: > What sensors are they? Normally the instrumentation people prefer 4 to > 20 ma. Do you have a part number?
This style comes in mnay different pressure ranges up to 2000 psi, and is generally sold on amazon for something over a $20 bill with a part number starting with "G1/4" and has a taperless thread that doesn't fit anything we know about, nominally 13mm dia by a guess of a .99 mm pitch. These are supposed to be 0-10 psi range. Ack the reviews, they've not been that dependable. Hookup info is like teeth for chickens. All they tell us is that they run on a 5 volt supply, and that the green wire is .5 to 4.5 volts over their pressure range. > Scott > > On Thursday, March 10, 2022, 8:02:18 AM CST, Thaddeus Waldner <[email protected]> wrote: > > But neither of the $23 sensors I bought, actually works. black to -, > > red to 5v, green to dvm on my test table, one rests at nominally 1 > > millivolt, the other at around 27 millivolts which doesn't change > > with the applied pressure. > > What are the sensors? Are they possibly PWM output and need a pull-up? > > They could also be current devices. Check if the current changes with > pressure. I didn't think to try a pullup. A CET with Oldtimers? Probably. Thanks Scott. Cheers, Gene Heskett. -- "There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order." -Ed Howdershelt (Author, 1940) If we desire respect for the law, we must first make the law respectable. - Louis D. Brandeis _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
