One of the features of 4-20 mA is "live zero". It allows the host controller to be able to tell the difference between a device that outputs zero (4mA) and...
This is correct and for wired sensors an important issue. In cases where this issue is less important you can get more resolution by this enhancement. Claus ...
Hi, I'm surprised nobody has mentioned this, but maybe its because its an overly complicated solution (but maybe it has some power saving advantages?). A Hall...
That's an ineteresting approach. It can be useful, when the external sensor need sto be galvanically isolated. Although, I've never seen a Hall effect sensor...
There are dozens of web sites that contain the history of the RTD which seems to all be stolen from the same source (From Omega Engineering?). The article...
ITS-68 has been obsolete for some time. It is still used by some long term environmental studies that don't want to change temperature scales in mid stream,...
Thanks! The search for ITS-90 led to a ton of hits related to thermocouples. I was able to narrow it down to RTD's with a sub search for IEC751. I finally...
... light lines? If "dark" and "light" is under IR illumination that the sensor can see, yes. If "dark" and "light" is what_you_ see under white light,...
As Tom says light and dark have to be viewed from the point of view of the IR sensor. Also the sensor needs IR light to see by. That means you need tungsten...
how fast will a ir sensor be able to sense the ir ray.... my application is to count the spokes in a two weeler tyre ... in turn with it calculate the speed of...
A cheap IR sensor can detect an IR ray from a cheap IR emitter over a distance of meters. TV remote control would be a good example of that. Shining through...
fnds, my ir +photodiode sensors work well in dark but behave abnormally when any traces of sunlight is present .... please tell me how to use a high pass...
Colleagues, Does anyone know how to detect a 3nA current? I need to design a circuit that would detect a 3nA current through a slice of tissue. The frequency...
Hallo Nick Many years ago I was developing in this area. We built logarithmic current-voltage convertors to measure currents of some 10 pA. I believe you are...
The second articel describing the reduction of input offset voltage and its drift was 19 MB after scanning the four pages. If you are interested please send me...
Hello Claus! Please send me a copy of the article also - if it's no problem for you. Will it help to scale down the scanned images by a few percent to get the...
Hello Marcus Due to the reduced contrast of the old print-out I scanned with 300 dpi. 100 dpi was to less. I can make another trail with 200 dpi. Otherwise I...
Colleagues, Unfortunately, we've just got our first spam message in this group. Job postings are spam. Rare exceptions can be arranged in advance for active...
Hi I want to measure the pressure of the water flow in the pipe .I want to use from Strain Gauge to measure the pressure.I cant drill the pipe .I must to stick...
How accurate do you need to be? If you just want to know if the pipe is pressurized or not this might work. Maybe even a high/medium/low indication. But if...
It must be work.and Its accuracy is high.the pipe is made of plastic. I want to measure the pressure of water. and the water moves across the pipe with 5bar...
So, it's a leak detector. That puts things into a different perspective. However, here are some further questions? - What's the diameter of the pipe and how...
I have a project that I want to begin working on, but dont know where to start. My idea is to construct a device that reacts to an identified object whenever...
You could solve the problem with a beacon. You are wearing the beacon and the pants have the receivers for the beacon. Your beacon can either transmit...
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