Hello dear all,
I need help how to connect the differential pressure transmitter (Model:YGX-PTS802,Range:0-1KPa ,output:4-20mA,supply:24VDC) to a DT80 series data logger.I have connected the parts according to the circuit attached below .At the end,I get false reading for the current value(I think the range of the readings should lie between 4-20mA as set by the manufacturer .).The readings comes far bigger than that range,like 167,182,177. etc..randomly changing big number.I would highly appreciate if anyone working in the related area could give some help.
Kind Regards,
Tarikayehu A.
It looks as though your hardware is set up correctly: At least you have a resistor across the data logger inputs, which effectively converts the 4-20 mA current to a voltage, which is what the data logger expects. Check your DT80's settings: It may be reporting an integer number of millivolts or something similar. Data loggers do not necessarily report readings in "engineering units" (e.g., PSI, volts, etc.) if you don't tell them what to do. The DT80 may be doing exactly what it should be doing, though I presume you can program it to convert inputs into engineering units using linear math functions (I'm not familiar with the DT80's details). How do the numbers change as you apply pressure to the pressure sensor? It is likely that your numbers are varying because you're seeing natural "noise" around a small signal (your three numbers enable us to calculate that the standard deviation is only ~4% of the mean; not bad for a signal near the noise floor). If you see your numbers increasing with increasing pressure (1 kPa is not very much- don't apply too much pressure!), everything may be well. You may have to develop a regression between data logger readings in millivolts and pressure in kPa.
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