I have a level sensor and transmitter(4-20mA standard) of Qidian Automation for sensing level of liquid in tank having capacity of 1000 litres. On transmitter it is displayed 0.516 when tank is half filled. How to know the unit in which transmitter is displaying this value?

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  • \$\begingroup\$ Please confirm if this is your level sensor: AliBaba QDY30A 4-20ma water liquid level sensor transmitter submersible pool water sensor transmitter HK$279.13-HK$581.51 ahqidian.en.alibaba.com/product/62201803469-811272534/…. \$\endgroup\$
    – tlfong01
    Nov 17, 2020 at 7:25
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    \$\begingroup\$ looks like 51,6% off full level \$\endgroup\$
    – Mike
    Nov 17, 2020 at 7:27
  • \$\begingroup\$ The product sheet link includes a very detailed user guide, with communication protocol and how to calculate the depth of sensor using water surface pressure and pressure at the sensor level. Please let me know if you are using the RS485 20mA interface and more details of the interface at your mcu of computer side. Cheers. \$\endgroup\$
    – tlfong01
    Nov 17, 2020 at 7:32
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    \$\begingroup\$ Read the data sheet. \$\endgroup\$
    – Andy aka
    Nov 17, 2020 at 8:54
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    \$\begingroup\$ @tlfong01.. For now I dont't have the model number. Only I can see some values written on transmitter like, Range : 0-5m, Output : 4-20mA, PWR : DC24V, Accuracy : 0.2%FS \$\endgroup\$ Nov 17, 2020 at 10:58


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