trunghiepsy Posted July 26, 2011 Report Share Posted July 26, 2011 Hi there! i have a question need everybody help. now i have a BP 20, i have doubts it die. now how can i test it (good or die. no need Dataloger) thanks all Link to comment Share on other sites More sharing options...
David Carlson Posted July 26, 2011 Report Share Posted July 26, 2011 Hi! There is information on testing all of our sensors in the Knowlegebase section of the NRG Systems website: http://www.nrgsystems.com/TechSupport/KnowledgeBase.aspx?q=testing%20@odbccategory%3E0&ctysel=&query=testing Here is what it says about BP-20: Testing a BP-20 pressure sensor Tools Required: 7 V DC to 35 V DC source (12 V nominal, battery recommended) Digital Voltmeter (DVM) set to 20 V DC scale Instructions: Disconnect BP-20 from logger Connect DC supply (-) to black wire Connect DC supply (+) to red wire Set DVM to 20 V DC scale Connect DVM (-) to black wire Connect DVM (+) to white wire (Note: older units have a both a green wire and white wire. In this case, use the green wire.) Measure and record output voltage on white wire (typically near 4 Volts)... To determine the absolute pressure as reported by the BP-20 use the following: kPa = (21.79 x Vout) + 10.55 Perfomance Comparison: Check this value against the logger display to confirm scale is correct. Check this value against another barometer to confirm reading is correct. Note: BP-20 should draw about 8 mA of current Example: BP-20 voltage output is measured to be 4.123 V DC... kPa = (21.79 X 4.123) + 10.55 kPa = 100.4 Link to comment Share on other sites More sharing options...
trunghiepsy Posted July 26, 2011 Author Report Share Posted July 26, 2011 Yes thanks Dave, but i dont know how many voltage it is die? output voltage beetwen black wire and white wire of me (BP-20) is ~ 10V what happen with it (BP-20) ? it die or good? thanks Dave so much. i waiting answer of you! Link to comment Share on other sites More sharing options...
David Carlson Posted July 27, 2011 Report Share Posted July 27, 2011 Hi, Does the voltage change, or remain constant? 10 V corresponds to a barometric pressure reading of 228 kPa. This is not a realistic reading for anywhere on the surface of Earth. Check to be sure the weep holes on either side of the cable strain relief are not plugged; they should be free for air to flow in and out. You can check this with a pin or paper clip. If the weep holes are clear and the sensor maintains unreasonably high pressure readings, it may be that the sensor is damaged. Link to comment Share on other sites More sharing options...
trunghiepsy Posted July 28, 2011 Author Report Share Posted July 28, 2011 thanks Dave so much. i will contact with manufactur about this problem. Link to comment Share on other sites More sharing options...
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